first commit

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/workspace.xml
+/.idea/libraries
+.DS_Store
+/build
+/captures

.idea/.name

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+UBBAttendance

.idea/compiler.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <resourceExtensions />
+    <wildcardResourcePatterns>
+      <entry name="!?*.java" />
+      <entry name="!?*.form" />
+      <entry name="!?*.class" />
+      <entry name="!?*.groovy" />
+      <entry name="!?*.scala" />
+      <entry name="!?*.flex" />
+      <entry name="!?*.kt" />
+      <entry name="!?*.clj" />
+      <entry name="!?*.aj" />
+    </wildcardResourcePatterns>
+    <annotationProcessing>
+      <profile default="true" name="Default" enabled="false">
+        <processorPath useClasspath="true" />
+      </profile>
+    </annotationProcessing>
+  </component>
+</project>

.idea/copyright/profiles_settings.xml

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+<component name="CopyrightManager">
+  <settings default="" />
+</component>

.idea/dictionaries/cromer.xml

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+<component name="ProjectDictionaryState">
+  <dictionary name="cromer" />
+</component>

.idea/encodings.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="PROJECT" charset="UTF-8" />
+  </component>
+</project>

.idea/gradle.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="distributionType" value="DEFAULT_WRAPPED" />
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="gradleJvm" value="1.7" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+            <option value="$PROJECT_DIR$/attendance-ubb" />
+          </set>
+        </option>
+        <option name="resolveModulePerSourceSet" value="false" />
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="EntryPointsManager">
+    <entry_points version="2.0" />
+  </component>
+  <component name="NullableNotNullManager">
+    <option name="myDefaultNullable" value="android.support.annotation.Nullable" />
+    <option name="myDefaultNotNull" value="android.support.annotation.NonNull" />
+    <option name="myNullables">
+      <value>
+        <list size="4">
+          <item index="0" class="java.lang.String" itemvalue="org.jetbrains.annotations.Nullable" />
+          <item index="1" class="java.lang.String" itemvalue="javax.annotation.Nullable" />
+          <item index="2" class="java.lang.String" itemvalue="edu.umd.cs.findbugs.annotations.Nullable" />
+          <item index="3" class="java.lang.String" itemvalue="android.support.annotation.Nullable" />
+        </list>
+      </value>
+    </option>
+    <option name="myNotNulls">
+      <value>
+        <list size="4">
+          <item index="0" class="java.lang.String" itemvalue="org.jetbrains.annotations.NotNull" />
+          <item index="1" class="java.lang.String" itemvalue="javax.annotation.Nonnull" />
+          <item index="2" class="java.lang.String" itemvalue="edu.umd.cs.findbugs.annotations.NonNull" />
+          <item index="3" class="java.lang.String" itemvalue="android.support.annotation.NonNull" />
+        </list>
+      </value>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/build/classes" />
+  </component>
+  <component name="ProjectType">
+    <option name="id" value="Android" />
+  </component>
+</project>

.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/UBBAttendance.iml" filepath="$PROJECT_DIR$/UBBAttendance.iml" />
+      <module fileurl="file://$PROJECT_DIR$/attendance-ubb/attendance-ubb.iml" filepath="$PROJECT_DIR$/attendance-ubb/attendance-ubb.iml" />
+    </modules>
+  </component>
+</project>

.idea/runConfigurations.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RunConfigurationProducerService">
+    <option name="ignoredProducers">
+      <set>
+        <option value="org.jetbrains.plugins.gradle.execution.test.runner.AllInPackageGradleConfigurationProducer" />
+        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestClassGradleConfigurationProducer" />
+        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestMethodGradleConfigurationProducer" />
+      </set>
+    </option>
+  </component>
+</project>

.navigation/attendance-ubb/raw/main.nvg.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<navigationModel
+  ns = "http://schemas.android.com?import=com.android.tools.idea.editors.navigation.model.*">
+  <locations
+    class = "java.util.ArrayList">
+    <statePointEntry>
+      <state
+        class = "com.android.tools.idea.editors.navigation.model.ActivityState"
+        className = "cl.cromer.attendance.SubjectList"/>
+      <point
+        x = "196"
+        y = "52"/>
+    </statePointEntry>
+  </locations>
+</navigationModel>

attendance-ubb/.gitignore

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+/build

attendance-ubb/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    signingConfigs {
+        cromer {
+            keyAlias 'cromer'
+            keyPassword 'K7PRxe4eyeXGr3FeULSapUEqHcKAZgkaGe6HmX7cNd873XBLwR'
+            storeFile file('/home/cromer/cromer_cl/keystore/keystore')
+            storePassword 'K7PRxe4eyeXGr3FeULSapUEqHcKAZgkaGe6HmX7cNd873XBLwR'
+        }
+    }
+    compileSdkVersion 27
+    buildToolsVersion "27"
+    defaultConfig {
+        applicationId "cl.cromer.ubb.attendance"
+        minSdkVersion 14
+        targetSdkVersion 27
+        versionCode 1
+        versionName "1.0"
+        signingConfig signingConfigs.cromer
+    }
+    buildTypes {
+        release {
+            minifyEnabled true
+            shrinkResources true
+            signingConfig signingConfigs.cromer
+            proguardFile '/home/cromer/StudioProjects/UBBAttendance/attendance-ubb/proguard-rules.pro'
+        }
+        debug {
+            debuggable true
+            jniDebuggable true
+            minifyEnabled false
+        }
+    }
+    productFlavors {
+    }
+}
+
+dependencies {
+    compile fileTree(include: ['*.jar'], dir: 'libs')
+    compile 'com.android.support:appcompat-v7:27.0.0'
+    compile 'com.android.support:design:27.0.0'
+    compile 'com.android.support:cardview-v7:27.0.0'
+    compile 'com.android.support:recyclerview-v7:27.0.0'
+}

attendance-ubb/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in /mnt/storage/Android/sdk/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+-keep public class org.apache.poi.** {*;}
+-dontwarn org.apache.poi.**
+
+-dontwarn android.support.v7.**
+-keep class android.support.v7.** { *; }
+-keep interface android.support.v7.** { *; }
+
+-dontwarn android.support.v4.**
+-keep class android.support.v4.** { *; }
+-keep interface android.support.v4.** { *; }

attendance-ubb/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest package="cl.cromer.ubb.attendance"
+          xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+    <uses-permission android:name="android.permission.WAKE_LOCK"/>
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/UBBTheme">
+        <activity
+            android:name=".SubjectList"
+            android:label="@string/app_name"
+            android:theme="@style/UBBTheme.NoActionBar">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <activity
+            android:name=".CourseList"
+            android:label="@string/app_name"
+            android:parentActivityName=".SubjectList"
+            android:theme="@style/UBBTheme">
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value="cl.cromer.ubb.attendance.SubjectList"/>
+        </activity>
+        <activity
+            android:name=".ClassList"
+            android:label="@string/app_name"
+            android:parentActivityName=".CourseList"
+            android:theme="@style/UBBTheme">
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value="cl.cromer.ubb.attendance.CourseList"/>
+        </activity>
+        <activity
+            android:name=".ImportExcel"
+            android:label="@string/app_name"
+            android:parentActivityName=".SubjectList"
+            android:screenOrientation="portrait"
+            android:theme="@style/UBBTheme">
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value="cl.cromer.ubb.attendance.SubjectList"/>
+        </activity>
+        <activity
+            android:name=".ImportPhotos"
+            android:label="@string/app_name"
+            android:parentActivityName=".SubjectList"
+            android:screenOrientation="portrait"
+            android:theme="@style/UBBTheme">
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value="cl.cromer.ubb.attendance.SubjectList"/>
+            >
+        </activity>
+        <activity
+            android:name=".TakeAttendance"
+            android:label="@string/app_name"
+            android:parentActivityName=".ClassList"
+            android:screenOrientation="portrait"
+            android:theme="@style/UBBTheme">
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value="cl.cromer.ubb.attendance.ClassList"/>
+        </activity>
+        <activity
+            android:name=".CorrectAttendance"
+            android:label="@string/app_name"
+            android:parentActivityName=".ClassList"
+            android:theme="@style/UBBTheme">
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value="cl.cromer.ubb.attendance.ClassList"/>
+        </activity>
+        <activity
+            android:name=".LateStudentAttendance"
+            android:label="@string/app_name"
+            android:parentActivityName=".ClassList"
+            android:theme="@style/UBBTheme">
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value="cl.cromer.ubb.attendance.ClassList"/>
+        </activity>
+        <activity
+            android:name=".ClassReport"
+            android:label="@string/app_name"
+            android:parentActivityName=".SubjectList"
+            android:screenOrientation="portrait"
+            android:theme="@style/UBBTheme">
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value="cl.cromer.ubb.attendance.SubjectList"/>
+        </activity>
+        <activity
+            android:name=".About"
+            android:label="@string/app_name"
+            android:parentActivityName=".SubjectList"
+            android:screenOrientation="portrait"
+            android:theme="@style/UBBTheme">
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value="cl.cromer.ubb.attendance.SubjectList"/>
+        </activity>
+        <activity
+            android:name=".CourseReport"
+            android:label="@string/app_name"
+            android:parentActivityName=".SubjectList"
+            android:screenOrientation="portrait"
+            android:theme="@style/UBBTheme">
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value="cl.cromer.ubb.attendance.SubjectList"/>
+        </activity>
+    </application>
+
+</manifest>

attendance-ubb/src/main/java/cl/cromer/ubb/attendance/About.java

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+package cl.cromer.ubb.attendance;
+
+import android.content.Intent;
+import android.net.Uri;
+import android.os.Bundle;
+import android.support.v7.app.ActionBar;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.Toolbar;
+import android.view.View;
+
+public class About extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_about);
+        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
+        setSupportActionBar(toolbar);
+        ActionBar actionBar = getSupportActionBar();
+        if (actionBar != null) {
+            actionBar.setHomeButtonEnabled(true);
+            actionBar.setDisplayHomeAsUpEnabled(true);
+        }
+    }
+
+    @Override
+    public void onBackPressed() {
+        super.onBackPressed();
+    }
+
+    @Override
+    public boolean onSupportNavigateUp() {
+        onBackPressed();
+        return true;
+    }
+
+    public void sendEmail(View view) {
+        Intent intent = new Intent(Intent.ACTION_SENDTO);
+        intent.setData(Uri.parse("mailto:"));
+        intent.putExtra(Intent.EXTRA_EMAIL, "chris@cromer.cl");
+        intent.putExtra(Intent.EXTRA_SUBJECT, "Attendance");
+        startActivity(Intent.createChooser(intent, getResources().getString(R.string.about_email)));
+    }
+}

attendance-ubb/src/main/java/cl/cromer/ubb/attendance/Attendance.java

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+package cl.cromer.ubb.attendance;
+
+public class Attendance extends Student {
+    private int status;
+    // 0 - uninitialized
+    // 1 - present
+    // 2 - justified
+    // 3 - absent
+    // 4 - late
+
+    private int present;
+    private int justified;
+    private int absent;
+    private int late;
+
+    public Attendance(int status, int studentId, String run, String firstName, String secondName, String firstLastName, String secondLastName, int major, int enrolled, String email, byte[] photo) {
+        super(studentId, run, firstName, secondName, firstLastName, secondLastName, major, enrolled, email, photo);
+        this.setStatus(status);
+    }
+
+    protected int getStatus() {
+        return status;
+    }
+
+    protected void setStatus(int status) {
+        this.status = status;
+    }
+
+    protected int getPresent() {
+        return present;
+    }
+
+    protected void setPresent(int present) {
+        this.present = present;
+    }
+
+    protected int getJustified() {
+        return justified;
+    }
+
+    protected void setJustified(int justified) {
+        this.justified = justified;
+    }
+
+    protected int getAbsent() {
+        return absent;
+    }
+
+    protected void setAbsent(int absent) {
+        this.absent = absent;
+    }
+
+    protected int getLate() {
+        return late;
+    }
+
+    protected void setLate(int late) {
+        this.late = late;
+    }
+}

attendance-ubb/src/main/java/cl/cromer/ubb/attendance/Class.java

@@ -0,0 +1,122 @@
+package cl.cromer.ubb.attendance;
+
+import android.content.Context;
+import android.os.Parcel;
+import android.os.Parcelable;
+
+import java.text.DateFormat;
+import java.util.Calendar;
+
+public class Class extends Course implements Parcelable {
+    private int classId;
+    private long date;
+
+    public Class() {}
+
+    public Class(Course course, long date) {
+        super(course.getCourseId(), course.getCourseSection(), course.getCourseSemester(), course.getYear());
+        this.setDate(date);
+    }
+
+    public Class(Course course, int classId, long date) {
+        super(course.getCourseId(), course.getCourseSection(), course.getCourseSemester(), course.getYear());
+        this.setClassId(classId);
+        this.setDate(date);
+    }
+
+    protected void setClass(Class classObject) {
+        this.setClassId(classObject.getClassId());
+        this.setDate(classObject.getDate());
+    }
+
+    protected int getClassId() {
+        return classId;
+    }
+
+    protected void setClassId(int classId) {
+        this.classId = classId;
+    }
+
+    protected long getDate() {
+        return date;
+    }
+
+    protected void setDate(long date) {
+        // Remove the time, I only need the date
+        Calendar calendar = Calendar.getInstance();
+        calendar.setTimeInMillis(date);
+        calendar.set(Calendar.HOUR_OF_DAY, 0);
+        calendar.set(Calendar.MINUTE, 0);
+        calendar.set(Calendar.SECOND, 0);
+        calendar.set(Calendar.MILLISECOND, 0);
+        date = calendar.getTimeInMillis();
+
+        this.date = date;
+    }
+
+    protected String getFormattedDate(Context context) {
+        Calendar calendar = Calendar.getInstance();
+        calendar.setTimeInMillis(date);
+        DateFormat dateFormat = DateFormat.getDateInstance(DateFormat.LONG, context.getResources().getConfiguration().locale);
+        return dateFormat.format(calendar.getTime());
+    }
+
+    protected String getFormattedShortDate(Context context) {
+        Calendar calendar = Calendar.getInstance();
+        calendar.setTimeInMillis(date);
+        DateFormat dateFormat = DateFormat.getDateInstance(DateFormat.SHORT, context.getResources().getConfiguration().locale);
+        return dateFormat.format(calendar.getTime());
+    }
+
+    // Parcelable
+    @Override
+    public int describeContents() {
+        //Must be overridden, but I don't need it.
+        return 0;
+    }
+
+    @Override
+    public void writeToParcel(Parcel out, int flags) {
+        out.writeInt(majorId);
+        out.writeString(majorName);
+        out.writeInt(majorCode);
+        out.writeInt(subjectId);
+        out.writeInt(subjectCode);
+        out.writeString(subjectName);
+        out.writeInt(courseId);
+        out.writeInt(courseSection);
+        out.writeInt(courseSemester);
+        out.writeInt(courseYear);
+        out.writeInt(classId);
+        out.writeLong(date);
+    }
+
+    private void readFromParcel(Parcel in) {
+        majorId = in.readInt();
+        majorName = in.readString();
+        majorCode = in.readInt();
+        subjectId = in.readInt();
+        subjectCode = in.readInt();
+        subjectName = in.readString();
+        courseId = in.readInt();
+        courseSection = in.readInt();
+        courseSemester = in.readInt();
+        courseYear = in.readInt();
+        classId = in.readInt();
+        date = in.readLong();
+    }
+
+    private Class(Parcel in) {
+        readFromParcel(in);
+    }
+
+    public static final Parcelable.Creator<Class> CREATOR = new Parcelable.Creator<Class>() {
+        public Class createFromParcel(Parcel in) {
+            return new Class(in);
+        }
+
+        public Class[] newArray(int size) {
+            return new Class[size];
+        }
+    };
+}

attendance-ubb/src/main/java/cl/cromer/ubb/attendance/ClassListAdapter.java

@@ -0,0 +1,77 @@
+package cl.cromer.ubb.attendance;
+
+import android.content.Context;
+import android.support.v7.widget.CardView;
+import android.support.v7.widget.RecyclerView;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import java.util.List;
+
+public class ClassListAdapter extends RecyclerView.Adapter<ClassListAdapter.ClassViewHolder> {
+
+    private List<Class> classes;
+    private Context context;
+
+    public ClassListAdapter(List<Class> classes, Context context) {
+        this.classes = classes;
+        this.context = context;
+    }
+
+    @Override
+    public int getItemCount() {
+        return classes.size();
+    }
+
+    @Override
+    public ClassViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
+        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.view_class_list_card, viewGroup, false);
+        return new ClassViewHolder(view);
+    }
+
+    @Override
+    public void onBindViewHolder(ClassViewHolder classViewHolder, int i) {
+        classViewHolder.classDate.setText(String.valueOf(classes.get(i).getFormattedDate(context)));
+        classViewHolder.classId.setText(String.valueOf(classes.get(i).getClassId()));
+        classViewHolder.itemView.setLongClickable(true);
+    }
+
+    @Override
+    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
+        super.onAttachedToRecyclerView(recyclerView);
+    }
+
+    public void addClass(Class classObject) {
+        classes.add(getItemCount(), classObject);
+        notifyItemInserted(getItemCount());
+    }
+
+    public void updateClass(int index, Class classObject) {
+        classes.set(index, classObject);
+        notifyItemChanged(index);
+    }
+
+    public Class getClass(int index) {
+        return classes.get(index);
+    }
+
+    public void deleteClass(Class classObject) {
+        classes.remove(classObject);
+    }
+
+    public static class ClassViewHolder extends RecyclerView.ViewHolder {
+        public CardView cardView;
+        public TextView classDate;
+        public TextView classId;
+
+        public ClassViewHolder(View itemView) {
+            super(itemView);
+            cardView = (CardView) itemView.findViewById(R.id.class_card_view);
+            classDate = (TextView) itemView.findViewById(R.id.class_date);
+            classId = (TextView) itemView.findViewById(R.id.class_id);
+        }
+    }
+
+}

attendance-ubb/src/main/java/cl/cromer/ubb/attendance/ClassReport.java

@@ -0,0 +1,968 @@
+package cl.cromer.ubb.attendance;
+
+import android.content.ActivityNotFoundException;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.content.res.ColorStateList;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
+import android.net.Uri;
+import android.os.AsyncTask;
+import android.os.Bundle;
+import android.os.Environment;
+import android.os.Handler;
+import android.os.PowerManager;
+import android.support.v4.content.ContextCompat;
+import android.support.v7.app.AlertDialog;
+import android.support.v7.app.AppCompatActivity;
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.AdapterView;
+import android.widget.ArrayAdapter;
+import android.widget.RelativeLayout;
+import android.widget.Spinner;
+import android.widget.Toast;
+
+import org.apache.poi.hssf.usermodel.HSSFWorkbook;
+import org.apache.poi.ss.usermodel.Cell;
+import org.apache.poi.ss.usermodel.CellStyle;
+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.ss.usermodel.Sheet;
+import org.apache.poi.ss.usermodel.Workbook;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import cl.cromer.ubb.attendance.Progress;
+import cl.cromer.ubb.attendance.DBSchema.*;
+
+public class ClassReport extends AppCompatActivity {
+
+    // SQLite database
+    private SQLParser sqlParser = null;
+    private SQLiteDatabase ubbDB = null;
+
+    // Background thread for the database
+    private Thread thread = null;
+    private Handler threadHandler = new Handler();
+
+    // Progress bar
+    private Progress progress = null;
+
+    private AlertDialog choiceDialog = null;
+    private AlertDialog confirmDialog = null;
+    private View reportView;
+
+    private List<Subject> subjects = new ArrayList<>();
+    private List<Course> courses = new ArrayList<>();
+    private List<Class> classes = new ArrayList<>();
+    private List<Attendance> students = new ArrayList<>();
+
+    private Class classObject = new Class();
+
+    private int disabledButtonColor;
+
+    private Context context;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_class_report);
+
+        this.context = this;
+
+        LayoutInflater inflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
+        reportView = inflater.inflate(R.layout.view_class_report, new RelativeLayout(this), false);
+
+        // Build the add subject dialog window using the subject view
+        AlertDialog.Builder builder = new AlertDialog.Builder(this);
+        builder.setView(reportView);
+        builder.setPositiveButton(R.string.input_accept, null);
+        builder.setNegativeButton(R.string.input_cancel, new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialog, int which) {
+                finish();
+            }
+        });
+
+        choiceDialog = builder.create();
+
+        choiceDialog.setOnShowListener(new DialogInterface.OnShowListener() {
+            @Override
+            public void onShow(DialogInterface dialogInterface) {
+                ColorStateList colorStateList = choiceDialog.getButton(AlertDialog.BUTTON_POSITIVE).getTextColors();
+                choiceDialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(false);
+                choiceDialog.getButton(AlertDialog.BUTTON_POSITIVE).setClickable(false);
+                choiceDialog.getButton(AlertDialog.BUTTON_NEGATIVE).setTextColor(ContextCompat.getColor(getApplicationContext(), R.color.colorPrimaryDark));
+
+                if (colorStateList != null) {
+                    disabledButtonColor = colorStateList.getColorForState(new int[] {-android.R.attr.state_enabled}, R.color.colorPrimary);
+                }
+            }
+        });
+
+        choiceDialog.getWindow().getAttributes().windowAnimations = R.style.DialogAnimation;
+        choiceDialog.setOnCancelListener(new DialogInterface.OnCancelListener() {
+            @Override
+            public void onCancel(DialogInterface dialog) {
+                finish();
+            }
+        });
+        choiceDialog.setCanceledOnTouchOutside(false);
+
+        // Create a progress dialog for slow devices
+        progress = new Progress();
+        progress.show(this, 1);
+        progress.setCancelable(false);
+
+        // Load the SQLite database
+        sqlParser = new SQLParser(this);
+        thread = new Thread(new Runnable() {
+            public void run() {
+                ubbDB = sqlParser.getWritableDatabase();
+                threadHandler.post(new Runnable() {
+                    public void run() {
+                        databaseLoaded();
+                    }
+                });
+            }
+        });
+        thread.start();
+        progress.setOnCancelListener(new DialogInterface.OnCancelListener() {
+            @Override
+            public void onCancel(DialogInterface dialog) {
+                thread.interrupt();
+                finish();
+            }
+        });
+    }
+
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        // We need to get rid of the progressbar if it's showing
+        if (progress != null && progress.isShowing()) {
+            progress.dismiss();
+        }
+        if (choiceDialog != null && choiceDialog.isShowing()) {
+            choiceDialog.dismiss();
+        }
+    }
+
+    @Override
+    public void onBackPressed() {
+        super.onBackPressed();
+    }
+
+    @Override
+    public boolean onSupportNavigateUp() {
+        onBackPressed();
+        return true;
+    }
+
+    private void databaseLoaded() {
+        final GetSubjects getSubjects = new GetSubjects(getApplicationContext());
+        getSubjects.execute();
+
+        progress.setOnCancelListener(new DialogInterface.OnCancelListener() {
+            @Override
+            public void onCancel(DialogInterface dialog) {
+                getSubjects.cancel(true);
+                finish();
+            }
+        });
+    }
+
+    private AdapterView.OnItemSelectedListener subjectListener() {
+        return new AdapterView.OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
+                courses = new ArrayList<>();
+                classes = new ArrayList<>();
+                if (position == 0) {
+                    choiceDialog.getButton(AlertDialog.BUTTON_POSITIVE).setTextColor(disabledButtonColor);
+                    choiceDialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(false);
+                    choiceDialog.getButton(AlertDialog.BUTTON_POSITIVE).setClickable(false);
+
+                    Spinner spinner = (Spinner) reportView.findViewById(R.id.course_spinner);
+
+                    List<String> options = new ArrayList<>();
+                    options.add(getResources().getString(R.string.report_course));
+
+                    ArrayAdapter<String> arrayAdapter = new ArrayAdapter<>(getApplicationContext(), R.layout.view_spinner_selected_item, options);
+                    arrayAdapter.setDropDownViewResource(R.layout.view_spinner_dropdown_item);
+
+                    spinner.setAdapter(arrayAdapter);
+                    spinner.setSelection(0);
+                    spinner.setEnabled(false);
+                    spinner.setClickable(false);
+                    spinner.setOnItemSelectedListener(null);
+
+                    spinner = (Spinner) reportView.findViewById(R.id.class_spinner);
+
+                    options = new ArrayList<>();
+                    options.add(getResources().getString(R.string.report_class));
+
+                    arrayAdapter = new ArrayAdapter<>(getApplicationContext(), R.layout.view_spinner_selected_item, options);
+                    arrayAdapter.setDropDownViewResource(R.layout.view_spinner_dropdown_item);
+
+                    spinner.setAdapter(arrayAdapter);
+                    spinner.setSelection(0);
+                    spinner.setEnabled(false);
+                    spinner.setClickable(false);
+                    spinner.setOnItemSelectedListener(null);
+                }
+                else {
+                    progress = new Progress();
+                    progress.show(context, 1);
+                    progress.setCancelable(false);
+
+                    final int thePosition = position - 1;
+
+                    classObject.setSubject(subjects.get(thePosition));
+
+                    sqlParser = new SQLParser(getApplicationContext());
+                    thread = new Thread(new Runnable() {
+                        public void run() {
+                            ubbDB = sqlParser.getWritableDatabase();
+                            threadHandler.post(new Runnable() {
+                                public void run() {
+
+                                    final GetCourses getCourses = new GetCourses(getApplicationContext());
+                                    getCourses.execute(thePosition);
+
+                                    progress.setOnCancelListener(new DialogInterface.OnCancelListener() {
+                                        @Override
+                                        public void onCancel(DialogInterface dialog) {
+                                            getCourses.cancel(true);
+                                            finish();
+                                        }
+                                    });
+                                }
+                            });
+                        }
+                    });
+                    thread.start();
+                    progress.setOnCancelListener(new DialogInterface.OnCancelListener() {
+                        @Override
+                        public void onCancel(DialogInterface dialog) {
+                            thread.interrupt();
+                            finish();
+                        }
+                    });
+                }
+            }
+
+            @Override
+            public void onNothingSelected(AdapterView<?> parent) {
+
+            }
+        };
+    }
+
+    private AdapterView.OnItemSelectedListener courseListener() {
+        return new AdapterView.OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
+                classes = new ArrayList<>();
+                if (position == 0) {
+                    choiceDialog.getButton(AlertDialog.BUTTON_POSITIVE).setTextColor(disabledButtonColor);
+                    choiceDialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(false);
+                    choiceDialog.getButton(AlertDialog.BUTTON_POSITIVE).setClickable(false);
+
+                    Spinner spinner = (Spinner) reportView.findViewById(R.id.class_spinner);
+
+                    List<String> options = new ArrayList<>();
+                    options.add(getResources().getString(R.string.report_class));
+
+                    ArrayAdapter<String> arrayAdapter = new ArrayAdapter<>(getApplicationContext(), R.layout.view_spinner_selected_item, options);
+                    arrayAdapter.setDropDownViewResource(R.layout.view_spinner_dropdown_item);
+
+                    spinner.setAdapter(arrayAdapter);
+                    spinner.setSelection(0);
+                    spinner.setEnabled(false);
+                    spinner.setClickable(false);
+                    spinner.setOnItemSelectedListener(null);
+                }
+                else {
+                    progress = new Progress();
+                    progress.show(context, 1);
+                    progress.setCancelable(false);
+
+                    final int thePosition = position - 1;
+
+                    classObject.setCourse(courses.get(thePosition));
+
+                    sqlParser = new SQLParser(getApplicationContext());
+                    thread = new Thread(new Runnable() {
+                        public void run() {
+                            ubbDB = sqlParser.getWritableDatabase();
+                            threadHandler.post(new Runnable() {
+                                public void run() {
+
+                                    final GetClasses getClasses = new GetClasses(getApplicationContext());
+                                    getClasses.execute(thePosition);
+
+                                    progress.setOnCancelListener(new DialogInterface.OnCancelListener() {
+                                        @Override
+                                        public void onCancel(DialogInterface dialog) {
+                                            getClasses.cancel(true);
+                                            finish();
+                                        }
+                                    });
+                                }
+                            });
+                        }
+                    });
+                    thread.start();
+                    progress.setOnCancelListener(new DialogInterface.OnCancelListener() {
+                        @Override
+                        public void onCancel(DialogInterface dialog) {
+                            thread.interrupt();
+                            finish();
+                        }
+                    });
+                }
+            }
+
+            @Override
+            public void onNothingSelected(AdapterView<?> parent) {
+
+            }
+        };
+    }
+
+    private AdapterView.OnItemSelectedListener classListener() {
+        return new AdapterView.OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
+                if (position == 0) {
+                    choiceDialog.getButton(AlertDialog.BUTTON_POSITIVE).setTextColor(disabledButtonColor);
+                    choiceDialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(false);
+                    choiceDialog.getButton(AlertDialog.BUTTON_POSITIVE).setClickable(false);
+                    choiceDialog.getButton(AlertDialog.BUTTON_POSITIVE).setOnClickListener(null);
+                }
+                else {
+                    classObject.setClass(classes.get(position - 1));
+
+                    choiceDialog.getButton(AlertDialog.BUTTON_POSITIVE).setTextColor(ContextCompat.getColor(getApplicationContext(), R.color.colorPrimaryDark));
+                    choiceDialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(true);
+                    choiceDialog.getButton(AlertDialog.BUTTON_POSITIVE).setClickable(true);
+                    choiceDialog.getButton(AlertDialog.BUTTON_POSITIVE).setOnClickListener(acceptListener());
+                }
+            }
+
+            @Override
+            public void onNothingSelected(AdapterView<?> parent) {
+
+            }
+        };
+    }
+
+    private View.OnClickListener acceptListener() {
+        return new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                progress = new Progress();
+                progress.show(context, 1);
+                progress.setCancelable(false);
+
+                choiceDialog.dismiss();
+
+                sqlParser = new SQLParser(getApplicationContext());
+                thread = new Thread(new Runnable() {
+                    public void run() {
+                        ubbDB = sqlParser.getWritableDatabase();
+                        threadHandler.post(new Runnable() {
+                            public void run() {
+
+                                final GetAttendance getAttendance = new GetAttendance(getApplicationContext());
+                                getAttendance.execute();
+
+                                progress.setOnCancelListener(new DialogInterface.OnCancelListener() {
+                                    @Override
+                                    public void onCancel(DialogInterface dialog) {
+                                        getAttendance.cancel(true);
+                                        finish();
+                                    }
+                                });
+                            }
+                        });
+                    }
+                });
+                thread.start();
+                progress.setOnCancelListener(new DialogInterface.OnCancelListener() {
+                    @Override
+                    public void onCancel(DialogInterface dialog) {
+                        thread.interrupt();
+                        finish();
+                    }
+                });
+            }
+        };
+    }
+
+    private class GetSubjects extends AsyncTask<Void, Void, Void> {
+        private Context context;
+        private PowerManager.WakeLock wakeLock;
+
+        protected GetSubjects(Context context) {
+            this.context = context;
+        }
+
+        @Override
+        protected void onPreExecute() {
+            super.onPreExecute();
+            // Let's make sure the CPU doesn't go to sleep
+            PowerManager powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
+            wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, getClass().getName());
+            if (!wakeLock.isHeld()) {
+                wakeLock.acquire();
+            }
+        }
+
+        @Override
+        protected Void doInBackground(Void... voids) {
+            if (isCancelled()) {
+                return null;
+            }
+
+            // Get subjects by name in ascending order
+            String query = "SELECT " + sqlParser.combineColumnsStrings(DBSubjects.ALL_COLUMNS, DBMajors.ALL_COLUMNS) + " FROM " + DBSubjects.TABLE_NAME + " INNER JOIN (SELECT " + sqlParser.combineColumnsStrings(DBMajors.ALL_COLUMNS) +" FROM " + DBMajors.TABLE_NAME + ") " + DBMajors.TABLE_NAME + " ON " + DBSubjects.TABLE_NAME + "." + DBSubjects.COLUMN_MAJOR + "=" + DBMajors.TABLE_NAME + "." + DBMajors.COLUMN_ID + " ORDER BY " + DBSubjects.COLUMN_NAME + " ASC";
+            if (BuildConfig.DEBUG) {
+                Log.d("ClassReport", query);
+            }
+            Cursor cursor = ubbDB.rawQuery(query, null);
+
+            // Iterate through the database rows
+            while (cursor.moveToNext()) {
+                if (isCancelled()) {
+                    return null;
+                }
+                Major major = new Major(
+                    cursor.getInt(cursor.getColumnIndex(DBMajors.COLUMN_ID)),
+                    cursor.getString(cursor.getColumnIndex(DBMajors.COLUMN_NAME)),
+                    cursor.getInt(cursor.getColumnIndex(DBMajors.COLUMN_CODE)));
+                subjects.add(
+                    new Subject(
+                        major,
+                        cursor.getInt(cursor.getColumnIndex(DBSubjects.COLUMN_ID)),
+                        cursor.getString(cursor.getColumnIndex(DBSubjects.COLUMN_NAME)),
+                        cursor.getInt(cursor.getColumnIndex(DBSubjects.COLUMN_CODE))
+                    )
+                );
+            }
+            cursor.close();
+
+            // Close the database connection
+            ubbDB.close();
+            sqlParser.close();
+
+            return null;
+        }
+
+        @Override
+        protected void onPostExecute(Void result) {
+            // Release the kraken errr wakelock
+            List<String> options = new ArrayList<>();
+            options.add(getResources().getString(R.string.report_subject));
+            for (Subject subject : subjects) {
+                options.add(subject.getSubjectName());
+            }
+
+            Spinner spinner = (Spinner) reportView.findViewById(R.id.subject_spinner);
+
+            ArrayAdapter<String> arrayAdapter = new ArrayAdapter<>(getApplicationContext(), R.layout.view_spinner_selected_item, options);
+            arrayAdapter.setDropDownViewResource(R.layout.view_spinner_dropdown_item);
+
+            spinner.setAdapter(arrayAdapter);
+            spinner.setSelection(0);
+
+            spinner.setOnItemSelectedListener(subjectListener());
+            progress.dismiss();
+            wakeLock.release();
+            choiceDialog.show();
+        }
+    }
+
+    private class GetCourses extends AsyncTask<Integer, Void, Void> {
+        private Context context;
+        private PowerManager.WakeLock wakeLock;
+
+        protected GetCourses(Context context) {
+            this.context = context;
+        }
+
+        @Override
+        protected void onPreExecute() {
+            super.onPreExecute();
+            // Let's make sure the CPU doesn't go to sleep
+            PowerManager powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
+            wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, getClass().getName());
+            if (!wakeLock.isHeld()) {
+                wakeLock.acquire();
+            }
+        }
+
+        @Override
+        protected Void doInBackground(Integer... position) {
+            if (isCancelled()) {
+                return null;
+            }
+
+            Cursor cursor = ubbDB.query(
+                    DBCourses.TABLE_NAME,
+                    DBCourses.ALL_COLUMNS,
+                    DBCourses.COLUMN_SUBJECT + "=" + subjects.get(position[0]).getSubjectId(),
+                    null,
+                    null,
+                    null,
+                    DBCourses.COLUMN_YEAR + " DESC, " + DBCourses.COLUMN_SEMESTER + " DESC, " + DBCourses.COLUMN_SECTION + " ASC",
+                    null);
+
+            // Iterate through the database rows
+            while (cursor.moveToNext()) {
+                if (isCancelled()) {
+                    return null;
+                }
+                courses.add(
+                    new Course(
+                        subjects.get(position[0]),
+                        cursor.getInt(cursor.getColumnIndex(DBCourses.COLUMN_ID)),
+                        cursor.getInt(cursor.getColumnIndex(DBCourses.COLUMN_SECTION)),
+                        cursor.getInt(cursor.getColumnIndex(DBCourses.COLUMN_SEMESTER)),
+                        cursor.getInt(cursor.getColumnIndex(DBCourses.COLUMN_YEAR))
+                    )
+                );
+            }
+            cursor.close();
+
+            // Close the database connection
+            ubbDB.close();
+            sqlParser.close();
+
+            return null;
+        }
+
+        @Override
+        protected void onPostExecute(Void result) {
+            // Release the kraken errr wakelock
+            List<String> options = new ArrayList<>();
+            options.add(getResources().getString(R.string.report_course));
+            for (Course course : courses) {
+                options.add(course.getYear() + "-" + course.getCourseSemester() + " " + getResources().getString(R.string.report_section) + " " + course.getCourseSection());
+            }
+
+            Spinner spinner = (Spinner) reportView.findViewById(R.id.course_spinner);
+
+            ArrayAdapter<String> arrayAdapter = new ArrayAdapter<>(getApplicationContext(), R.layout.view_spinner_selected_item, options);
+            arrayAdapter.setDropDownViewResource(R.layout.view_spinner_dropdown_item);
+
+            spinner.setAdapter(arrayAdapter);
+            spinner.setSelection(0);
+            spinner.setEnabled(true);
+            spinner.setClickable(true);
+
+            spinner.setOnItemSelectedListener(courseListener());
+            progress.dismiss();
+            wakeLock.release();
+        }
+    }
+
+    private class GetClasses extends AsyncTask<Integer, Void, Void> {
+        private Context context;
+        private PowerManager.WakeLock wakeLock;
+
+        protected GetClasses(Context context) {
+            this.context = context;
+        }
+
+        @Override
+        protected void onPreExecute() {
+            super.onPreExecute();
+            // Let's make sure the CPU doesn't go to sleep
+            PowerManager powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
+            wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, getClass().getName());
+            if (!wakeLock.isHeld()) {
+                wakeLock.acquire();
+            }
+        }
+
+        @Override
+        protected Void doInBackground(Integer... position) {
+            if (isCancelled()) {
+                return null;
+            }
+
+            Cursor cursor = ubbDB.query(
+                    DBClasses.TABLE_NAME,
+                    DBClasses.ALL_COLUMNS,
+                    DBClasses.COLUMN_COURSE + "=" + courses.get(position[0]).getCourseId(),
+                    null,
+                    null,
+                    null,
+                    DBClasses.COLUMN_DATE + " DESC",
+                    null);
+
+            // Iterate through the database rows
+            while (cursor.moveToNext()) {
+                if (isCancelled()) {
+                    return null;
+                }
+                classes.add(
+                    new Class(
+                        courses.get(position[0]),
+                        cursor.getInt(cursor.getColumnIndex(DBClasses.COLUMN_ID)),
+                        cursor.getLong(cursor.getColumnIndex(DBClasses.COLUMN_DATE))
+                    )
+                );
+            }
+            cursor.close();
+
+            // Close the database connection
+            ubbDB.close();
+            sqlParser.close();
+
+            return null;
+        }
+
+        @Override
+        protected void onPostExecute(Void result) {
+            // Release the kraken errr wakelock
+            List<String> options = new ArrayList<>();
+            options.add(getResources().getString(R.string.report_class));
+            for (Class classObject : classes) {
+                options.add(classObject.getFormattedDate(getApplicationContext()));
+            }
+
+            Spinner spinner = (Spinner) reportView.findViewById(R.id.class_spinner);
+
+            ArrayAdapter<String> arrayAdapter = new ArrayAdapter<>(getApplicationContext(), R.layout.view_spinner_selected_item, options);
+            arrayAdapter.setDropDownViewResource(R.layout.view_spinner_dropdown_item);
+
+            spinner.setAdapter(arrayAdapter);
+            spinner.setSelection(0);
+            spinner.setEnabled(true);
+            spinner.setClickable(true);
+
+            spinner.setOnItemSelectedListener(classListener());
+            progress.dismiss();
+            wakeLock.release();
+        }
+    }
+
+    private class GetAttendance extends AsyncTask<Void, Void, Boolean> {
+        private Context context;
+        private PowerManager.WakeLock wakeLock;
+
+        protected GetAttendance(Context context) {
+            this.context = context;
+        }
+
+        @Override
+        protected void onPreExecute() {
+            super.onPreExecute();
+            // Let's make sure the CPU doesn't go to sleep
+            PowerManager powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
+            wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, getClass().getName());
+            if (!wakeLock.isHeld()) {
+                wakeLock.acquire();
+            }
+        }
+
+        @Override
+        protected Boolean doInBackground(Void... voids) {
+            if (isCancelled()) {
+                return false;
+            }
+
+            String query = "SELECT " + sqlParser.combineColumnsStrings(DBStudents.ALL_COLUMNS, DBAttendance.ALL_COLUMNS) + " FROM " + DBStudents.TABLE_NAME +
+                " INNER JOIN (SELECT " + sqlParser.combineColumnsStrings(DBCoursesStudents.ALL_COLUMNS) + " FROM " + DBCoursesStudents.TABLE_NAME + " WHERE " + DBCoursesStudents.COLUMN_COURSE + "=" + classObject.getCourseId() + ") AS " + DBCoursesStudents.TABLE_NAME + " ON " + DBStudents.TABLE_NAME + "." + DBStudents.COLUMN_ID + "=" + DBCoursesStudents.TABLE_NAME + "." + DBCoursesStudents.COLUMN_STUDENT +
+                " LEFT OUTER JOIN (SELECT " + sqlParser.combineColumnsStrings(DBAttendance.ALL_COLUMNS) + " FROM " + DBAttendance.TABLE_NAME + " WHERE " + DBAttendance.COLUMN_CLASS + "=" + classObject.getClassId() + ") AS " + DBAttendance.TABLE_NAME + " ON " + DBStudents.TABLE_NAME + "." + DBStudents.COLUMN_ID + "=" + DBAttendance.TABLE_NAME + "." + DBAttendance.COLUMN_STUDENT +
+                " ORDER BY " + DBStudents.COLUMN_FIRST_LAST_NAME + " ASC, " + DBStudents.COLUMN_FIRST_NAME + " ASC";
+            if (BuildConfig.DEBUG) {
+                Log.d("ClassReport", query);
+            }
+            Cursor cursor = ubbDB.rawQuery(query, null);
+
+            // Iterate through the database rows
+            while (cursor.moveToNext()) {
+                if (isCancelled()) {
+                    return null;
+                }
+                students.add(new Attendance(
+                    cursor.getInt(cursor.getColumnIndex(DBAttendance.COLUMN_ATTENDANCE)),
+                    cursor.getInt(cursor.getColumnIndex(DBStudents.COLUMN_ID)),
+                    cursor.getString(cursor.getColumnIndex(DBStudents.COLUMN_RUN)),
+                    cursor.getString(cursor.getColumnIndex(DBStudents.COLUMN_FIRST_NAME)),
+                    cursor.getString(cursor.getColumnIndex(DBStudents.COLUMN_SECOND_NAME)),
+                    cursor.getString(cursor.getColumnIndex(DBStudents.COLUMN_FIRST_LAST_NAME)),
+                    cursor.getString(cursor.getColumnIndex(DBStudents.COLUMN_SECOND_LAST_NAME)),
+                    cursor.getInt(cursor.getColumnIndex(DBStudents.COLUMN_MAJOR)),
+                    cursor.getInt(cursor.getColumnIndex(DBStudents.COLUMN_ENROLLED)),
+                    cursor.getString(cursor.getColumnIndex(DBStudents.COLUMN_EMAIL)),
+                    cursor.getBlob(cursor.getColumnIndex(DBStudents.COLUMN_PHOTO))
+                ));
+            }
+            cursor.close();
+
+            Workbook workbook = new HSSFWorkbook();
+            Sheet sheet = workbook.createSheet(getResources().getString(R.string.app_name));
+
+            Excel excel = new Excel(workbook);
+            excel.createStyles();
+
+            Row row;
+            Cell cell;
+            // Major
+            row = sheet.createRow(0);
+            cell = row.createCell(0);
+            cell.setCellValue(classObject.getMajorName() + " - " + classObject.getMajorCode());
+            cell.setCellStyle(excel.getCellStyle("left"));
+            for (int i = 1; i < 7; i++) {
+                cell = row.createCell(i);
+                if (i == 6) {
+                    cell.setCellStyle(excel.getCellStyle("right"));
+                }
+                else {
+                    cell.setCellStyle(excel.getCellStyle("middle"));
+                }
+            }
+
+            // Subject
+            row = sheet.createRow(1);
+            cell = row.createCell(0);
+            cell.setCellValue(classObject.getSubjectName() + " - " + classObject.getSubjectCode());
+            cell.setCellStyle(excel.getCellStyle("left"));
+            for (int i = 1; i < 7; i++) {
+                cell = row.createCell(i);
+                if (i == 6) {
+                    cell.setCellStyle(excel.getCellStyle("right"));
+                }
+                else {
+                    cell.setCellStyle(excel.getCellStyle("middle"));
+                }
+            }
+
+            // Columns
+            row = sheet.createRow(2);
+
+            cell = row.createCell(0);
+            cell.setCellValue(getResources().getString(R.string.report_names));
+            cell.setCellStyle(excel.getCellStyle("blue"));
+
+            cell = row.createCell(1);
+            cell.setCellValue(getResources().getString(R.string.report_first_last_name));
+            cell.setCellStyle(excel.getCellStyle("blue"));
+
+            cell = row.createCell(2);
+            cell.setCellValue(getResources().getString(R.string.report_second_last_name));
+            cell.setCellStyle(excel.getCellStyle("blue"));
+
+            cell = row.createCell(3);
+            cell.setCellValue(getResources().getString(R.string.report_present));
+            cell.setCellStyle(excel.getCellStyle("green"));
+
+            cell = row.createCell(4);
+            cell.setCellValue(getResources().getString(R.string.report_late));
+            cell.setCellStyle(excel.getCellStyle("yellow"));
+
+            cell = row.createCell(5);
+            cell.setCellValue(getResources().getString(R.string.report_justified));
+            cell.setCellStyle(excel.getCellStyle("orange"));
+
+            cell = row.createCell(6);
+            cell.setCellValue(getResources().getString(R.string.report_absent));
+            cell.setCellStyle(excel.getCellStyle("red"));
+
+            int cellSize1 = getResources().getString(R.string.report_names).length();
+            int cellSize2 = getResources().getString(R.string.report_first_last_name).length();
+            int cellSize3 = getResources().getString(R.string.report_second_last_name).length();
+            int rowNumber = 3;
+            String value;
+            for (Attendance student : students) {
+                row = sheet.createRow(rowNumber);
+
+                // First and second name
+                cell = row.createCell(0);
+                value = student.getFirstName() + " " + student.getSecondName();
+                if (value.length() > cellSize1) {
+                    cellSize1 = value.length();
+                }
+                cell.setCellValue(value);
+                cell.setCellStyle(excel.getCellStyle("main"));
+
+                // First last name
+                cell = row.createCell(1);
+                value = student.getFirstLastName();
+                if (value.length() > cellSize2) {
+                    cellSize2 = value.length();
+                }
+                cell.setCellValue(value);
+                cell.setCellStyle(excel.getCellStyle("main"));
+
+                // Second last name
+                cell = row.createCell(2);
+                value = student.getSecondLastName();
+                if (value.length() > cellSize3) {
+                    cellSize3 = value.length();
+                }
+                cell.setCellValue(value);
+                cell.setCellStyle(excel.getCellStyle("main"));
+
+                int status = student.getStatus();
+                int attendanceCell = 3;
+                if (status != 0) {
+                    switch (status) {
+                        case 1:
+                            attendanceCell = 3;
+                            break;
+                        case 4:
+                            attendanceCell = 4;
+                            break;
+                        case 2:
+                            attendanceCell = 5;
+                            break;
+                        case 3:
+                            attendanceCell = 6;
+                            break;
+                    }
+                }
+
+                CellStyle attendanceColor = null;
+                for (int i = 3; i < 7; i++) {
+                    cell = row.createCell(i);
+                    switch (i) {
+                        case 3:
+                            attendanceColor = excel.getCellStyle("green");
+                            break;
+                        case 4:
+                            attendanceColor = excel.getCellStyle("yellow");
+                            break;
+                        case 5:
+                            attendanceColor = excel.getCellStyle("orange");
+                            break;
+                        case 6:
+                            attendanceColor = excel.getCellStyle("red");
+                            break;
+                    }
+                    if (i == attendanceCell) {
+                        cell.setCellValue("X");
+                    }
+                    cell.setCellStyle(attendanceColor);
+                }
+
+                rowNumber++;
+            }
+            sheet.setColumnWidth(0, (cellSize1 + 1) * 256);
+            sheet.setColumnWidth(1, (cellSize2 + 1) * 256);
+            sheet.setColumnWidth(2, (cellSize3 + 1) * 256);
+
+            final String filePath = StringFixer.removeInvalidFileCharacters(Environment.getExternalStorageDirectory() +
+                "/" + getResources().getString(R.string.app_name) +
+                "/" + classObject.getMajorName() +
+                "/" + classObject.getYear() + "-" + classObject.getCourseSemester() + "-" + classObject.getCourseSection());
+
+            final String fileName = "/" + getResources().getString(R.string.report_class) + "-" + classObject.getFormattedShortDate(context).replaceAll("/", "-") + ".xls";
+
+            try {
+                File file = new File(filePath);
+                if (!file.exists()) {
+                    if (!file.mkdirs()) {
+                        return false;
+                    }
+                }
+                FileOutputStream fileOutputStream = new FileOutputStream(filePath + fileName);
+                workbook.write(fileOutputStream);
+                fileOutputStream.close();
+            }
+            catch (FileNotFoundException e) {
+                if (BuildConfig.DEBUG) {
+                    e.printStackTrace();
+                }
+                return false;
+            }
+            catch (IOException e) {
+                if (BuildConfig.DEBUG) {
+                    e.printStackTrace();
+                }
+                return false;
+            }
+
+            // Close the database connection
+            ubbDB.close();
+            sqlParser.close();
+
+            return true;
+        }
+
+        @Override
+        protected void onPostExecute(Boolean result) {
+            // Release the kraken errr wakelock
+            if (result) {
+                confirmOpen();
+            }
+            else {
+                Toast.makeText(getApplicationContext(), R.string.report_fail, Toast.LENGTH_SHORT).show();
+                finish();
+            }
+            progress.dismiss();
+            wakeLock.release();
+        }
+    }
+
+    private void confirmOpen() {
+        final String filePath = StringFixer.removeInvalidFileCharacters(Environment.getExternalStorageDirectory() +
+            "/" + getResources().getString(R.string.app_name) +
+            "/" + classObject.getMajorName() +
+            "/" + classObject.getYear() + "-" + classObject.getCourseSemester() + "-" + classObject.getCourseSection());
+
+        final String fileName = "/" + getResources().getString(R.string.report_class) + "-" + classObject.getFormattedShortDate(context).replaceAll("/", "-") + ".xls";
+
+        AlertDialog.Builder builder = new AlertDialog.Builder(context);
+        builder.setMessage(R.string.report_created);
+        builder.setPositiveButton(R.string.input_yes, new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialog, int which) {
+                File file  = new File(filePath + fileName);
+                Intent intent = new Intent(Intent.ACTION_VIEW);
+                intent.setDataAndType(Uri.fromFile(file), "application/vnd.ms-excel");
+
+                try {
+                    startActivity(intent);
+                }
+                catch (ActivityNotFoundException e) {
+                    Toast.makeText(ClassReport.this, "No Application Available to View Excel", Toast.LENGTH_SHORT).show();
+                }
+                confirmDialog.dismiss();
+                finish();
+            }
+        });
+        builder.setNegativeButton(R.string.input_no, new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialog, int which) {
+                confirmDialog.dismiss();
+                finish();
+            }
+        });
+
+        builder.setCancelable(true);
+        confirmDialog = builder.create();
+
+        confirmDialog.setOnShowListener(new DialogInterface.OnShowListener() {
+            @Override
+            public void onShow(DialogInterface dialogInterface) {
+                confirmDialog.getButton(AlertDialog.BUTTON_POSITIVE).setTextColor(ContextCompat.getColor(getApplicationContext(), R.color.colorPrimaryDark));
+                confirmDialog.getButton(AlertDialog.BUTTON_NEGATIVE).setTextColor(ContextCompat.getColor(getApplicationContext(), R.color.colorPrimaryDark));
+            }
+        });
+
+        confirmDialog.show();
+    }
+}

attendance-ubb/src/main/java/cl/cromer/ubb/attendance/CorrectAttendance.java

@@ -0,0 +1,508 @@
+package cl.cromer.ubb.attendance;
+
+import android.app.ActivityManager;
+import android.content.ContentValues;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.os.AsyncTask;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.PowerManager;
+import android.support.v7.app.ActionBar;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.Toolbar;
+import android.util.Base64;
+import android.util.DisplayMetrics;
+import android.util.Log;
+import android.view.View;
+import android.view.animation.Animation;
+import android.view.animation.AnimationUtils;
+import android.widget.Button;
+import android.widget.ImageView;
+import android.widget.Toast;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import cl.cromer.ubb.attendance.Progress;
+import cl.cromer.ubb.attendance.DBSchema.DBAttendance;
+import cl.cromer.ubb.attendance.DBSchema.DBCoursesStudents;
+import cl.cromer.ubb.attendance.DBSchema.DBStudents;
+
+public class CorrectAttendance extends AppCompatActivity implements TakeAttendanceListener {
+
+    // SQLite database
+    private SQLParser sqlParser = null;
+    private SQLiteDatabase ubbDB = null;
+
+    // Background thread for the database
+    private Thread thread = null;
+    private Handler threadHandler = new Handler();
+
+    // Progress bar
+    private Progress progress = null;
+
+    private Class classObject = null;
+
+    private List<Attendance> students = new ArrayList<>();
+
+    private int studentShowing = -1;
+
+    private Bitmap bitmap = null;
+
+    private boolean finalStudent = false;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        // Receive the course from the previous activity
+        Intent classListIntent = getIntent();
+        classObject = classListIntent.getParcelableExtra(StaticVariables.CLASS_OBJECT);
+
+        setContentView(R.layout.activity_correct_attendance);
+        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
+        toolbar.setTitle(classObject.getFormattedDate(this));
+        setSupportActionBar(toolbar);
+        ActionBar actionBar = getSupportActionBar();
+        if (actionBar != null) {
+            actionBar.setHomeButtonEnabled(true);
+            actionBar.setDisplayHomeAsUpEnabled(true);
+        }
+
+        if (BuildConfig.DEBUG) {
+            /*
+            Pixel Densities
+            mdpi: 	    160 dpi 	1×
+            hdpi: 	    240 dpi 	1.5×
+            xhdpi: 	    320 dpi 	2×
+            xxhdpi: 	490 dpi 	3×
+            xxxhdpi: 	640 dpi 	4×
+             */
+            switch (getResources().getDisplayMetrics().densityDpi) {
+                case DisplayMetrics.DENSITY_LOW:
+                    Log.d("TakeAttendance", "Density: ldpi");
+                    break;
+                case DisplayMetrics.DENSITY_MEDIUM:
+                    Log.d("TakeAttendance", "Density: mdpi");
+                    break;
+                case DisplayMetrics.DENSITY_HIGH:
+                    Log.d("TakeAttendance", "Density: hdpi");
+                    break;
+                case DisplayMetrics.DENSITY_XHIGH:
+                    Log.d("TakeAttendance", "Density: xhdpi");
+                    break;
+                case DisplayMetrics.DENSITY_XXHIGH:
+                    Log.d("TakeAttendance", "Density: xxhdpi");
+                    break;
+                case DisplayMetrics.DENSITY_XXXHIGH:
+                    Log.d("TakeAttendance", "Density: xxxhdpi");
+                    break;
+                case DisplayMetrics.DENSITY_560:
+                    Log.d("TakeAttendance", "Density: 560dpi");
+                    break;
+                default:
+                    Log.d("TakeAttendance", "Density unknown: " + getResources().getDisplayMetrics().densityDpi);
+                    break;
+            }
+        }
+
+        // Create a progress dialog for slow devices
+        progress = new Progress();
+        progress.show(this, 1);
+        progress.setCancelable(false);
+
+        // Load the SQLite database
+        sqlParser = new SQLParser(this);
+        thread = new Thread(new Runnable() {
+            public void run() {
+                ubbDB = sqlParser.getWritableDatabase();
+                threadHandler.post(new Runnable() {
+                    public void run() {
+                        databaseLoaded();
+                    }
+                });
+            }
+        });
+        thread.start();
+        progress.setOnCancelListener(new DialogInterface.OnCancelListener() {
+            @Override
+            public void onCancel(DialogInterface dialog) {
+                thread.interrupt();
+                finish();
+            }
+        });
+    }
+
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        // We need to get rid of the progress bar if it's showing
+        if (progress != null && progress.isShowing()) {
+            progress.dismiss();
+        }
+        if (ubbDB.isOpen()) {
+            ubbDB.close();
+            sqlParser.close();
+        }
+    }
+
+    @Override
+    public void onBackPressed() {
+        if (ubbDB.isOpen()) {
+            ubbDB.close();
+            sqlParser.close();
+        }
+        super.onBackPressed();
+        Intent classListIntent = new Intent();
+        classListIntent.putExtra(StaticVariables.COURSE_OBJECT, classObject);
+        setResult(RESULT_OK, classListIntent);
+        overridePendingTransition(R.anim.hold_back, R.anim.push_right_out);
+    }
+
+    @Override
+    public boolean onSupportNavigateUp() {
+        onBackPressed();
+        return true;
+    }
+
+    private void databaseLoaded() {
+        // The database has finished loading show the content
+        final ShowContent showContent = new ShowContent(getApplicationContext());
+        showContent.execute();
+
+        progress.setOnCancelListener(new DialogInterface.OnCancelListener() {
+            @Override
+            public void onCancel(DialogInterface dialog) {
+                showContent.cancel(true);
+                finish();
+            }
+        });
+    }
+
+    private class ShowContent extends AsyncTask<Void, Void, Integer> {
+        private Context context;
+        private PowerManager.WakeLock wakeLock;
+
+        protected ShowContent(Context context) {
+            this.context = context;
+        }
+
+        @Override
+        protected void onPreExecute() {
+            super.onPreExecute();
+            // Let's make sure the CPU doesn't go to sleep
+            PowerManager powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
+            wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, getClass().getName());
+            if (!wakeLock.isHeld()) {
+                wakeLock.acquire();
+            }
+        }
+
+        @Override
+        protected Integer doInBackground(Void... voids) {
+            if (isCancelled()) {
+                return null;
+            }
+
+            // Get subjects by name in ascending order
+            String query = "SELECT " + sqlParser.combineColumnsStrings(DBStudents.ALL_COLUMNS, DBAttendance.ALL_COLUMNS) + " FROM " + DBStudents.TABLE_NAME +
+                " INNER JOIN (SELECT " + sqlParser.combineColumnsStrings(DBCoursesStudents.ALL_COLUMNS) + " FROM " + DBCoursesStudents.TABLE_NAME + " WHERE " + DBCoursesStudents.COLUMN_COURSE + "=" + classObject.getCourseId() + ") AS " + DBCoursesStudents.TABLE_NAME + " ON " + DBStudents.TABLE_NAME + "." + DBStudents.COLUMN_ID + "=" + DBCoursesStudents.TABLE_NAME + "." + DBCoursesStudents.COLUMN_STUDENT +
+                " INNER JOIN (SELECT " + sqlParser.combineColumnsStrings(DBAttendance.ALL_COLUMNS) + " FROM " + DBAttendance.TABLE_NAME + " WHERE " + DBAttendance.COLUMN_CLASS + "=" + classObject.getClassId() + ") AS " + DBAttendance.TABLE_NAME + " ON " + DBStudents.TABLE_NAME + "." + DBStudents.COLUMN_ID + "=" + DBAttendance.TABLE_NAME + "." + DBAttendance.COLUMN_STUDENT +
+                " ORDER BY " + DBStudents.COLUMN_FIRST_LAST_NAME + " ASC, " + DBStudents.COLUMN_FIRST_NAME + " ASC";
+            if (BuildConfig.DEBUG) {
+                Log.d("SubjectList", query);
+            }
+            Cursor cursor = ubbDB.rawQuery(query, null);
+
+            if (cursor.getCount() == 0) {
+                return 1;
+            }
+
+            // Iterate through the database rows
+            while (cursor.moveToNext()) {
+                if (isCancelled()) {
+                    return null;
+                }
+
+                int status = cursor.getInt(cursor.getColumnIndex(DBAttendance.COLUMN_ATTENDANCE));
+                if (status != 0 && status != 3) {
+                    students.add(new Attendance(
+                        status,
+                        cursor.getInt(cursor.getColumnIndex(DBStudents.COLUMN_ID)),
+                        cursor.getString(cursor.getColumnIndex(DBStudents.COLUMN_RUN)),
+                        cursor.getString(cursor.getColumnIndex(DBStudents.COLUMN_FIRST_NAME)),
+                        cursor.getString(cursor.getColumnIndex(DBStudents.COLUMN_SECOND_NAME)),
+                        cursor.getString(cursor.getColumnIndex(DBStudents.COLUMN_FIRST_LAST_NAME)),
+                        cursor.getString(cursor.getColumnIndex(DBStudents.COLUMN_SECOND_LAST_NAME)),
+                        cursor.getInt(cursor.getColumnIndex(DBStudents.COLUMN_MAJOR)),
+                        cursor.getInt(cursor.getColumnIndex(DBStudents.COLUMN_ENROLLED)),
+                        cursor.getString(cursor.getColumnIndex(DBStudents.COLUMN_EMAIL)),
+                        cursor.getBlob(cursor.getColumnIndex(DBStudents.COLUMN_PHOTO))
+                    ));
+                }
+            }
+            cursor.close();
+
+            return 2;
+        }
+
+        @Override
+        protected void onPostExecute(Integer result) {
+            // Release the kraken errr wakelock
+            progress.dismiss();
+            wakeLock.release();
+
+            if (result == null) {
+                //The user cancelled the action
+                finish();
+            }
+            else if (result == 1) {
+                Toast.makeText(context, R.string.attendance_no_students_correct, Toast.LENGTH_SHORT).show();
+                finish();
+            }
+            else if (students.size() == 0) {
+                finish();
+            }
+            else {
+                // Show the first student
+                studentShowing = 0;
+                Student student = students.get(studentShowing);
+
+                if (student.getPhoto() == null) {
+                    BitmapFactory.Options options = new BitmapFactory.Options();
+                    ActivityManager activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
+                    if (activityManager.getMemoryClass() <= 64) {
+                        options.inSampleSize = 2; // Shrink quality
+                    }
+                    else {
+                        options.inSampleSize = 1; // Full quality
+                    }
+                    bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.student_photo, options);
+                }
+                else {
+                    BitmapFactory.Options options = new BitmapFactory.Options();
+                    ActivityManager activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
+                    if (activityManager.getMemoryClass() <= 64) {
+                        options.inSampleSize = 2; // Shrink quality
+                    }
+                    else {
+                        options.inSampleSize = 1; // Full quality
+                    }
+                    bitmap = BitmapFactory.decodeByteArray(student.getPhoto(), 0, student.getPhoto().length, options);
+                }
+                ImageView imageView = (ImageView) findViewById(R.id.student_photo);
+                imageView.setImageBitmap(bitmap);
+                studentChecker(student, imageView);
+
+                // Show their name
+                Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
+                toolbar.setSubtitle(student.getFullName());
+
+                buttonListeners();
+            }
+        }
+    }
+
+    private void buttonListeners() {
+        // Set up the listeners
+        Button button = (Button) findViewById(R.id.button_absent);
+        button.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                attendance(3);
+            }
+        });
+
+        button = (Button) findViewById(R.id.button_present);
+        button.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                attendance(-1);
+            }
+        });
+    }
+
+    private void attendance(int status) {
+        Attendance student = students.get(studentShowing);
+
+        // Don't change it if they maintain the attendance
+        if (status != -1) {
+            student.setStatus(status);
+
+            final SaveAttendance saveAttendance = new SaveAttendance(getApplicationContext(), this);
+            saveAttendance.execute(student);
+
+            progress.setOnCancelListener(new DialogInterface.OnCancelListener() {
+                @Override
+                public void onCancel(DialogInterface dialog) {
+                    saveAttendance.cancel(true);
+                    finish();
+                }
+            });
+        }
+
+        if (students.size() > studentShowing + 1) {
+            studentShowing++;
+            student = students.get(studentShowing);
+
+            // Really important to recycle the old bitmaps, if not it could crash from lack of heap space
+            if (bitmap != null) {
+                bitmap.recycle();
+            }
+
+            if (student.getPhoto() == null) {
+                BitmapFactory.Options options = new BitmapFactory.Options();
+                ActivityManager activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
+                if (activityManager.getMemoryClass() <= 64) {
+                    options.inSampleSize = 2; // Shrink quality
+                }
+                else {
+                    options.inSampleSize = 1; // Full quality
+                }
+                bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.student_photo, options);
+            }
+            else {
+                BitmapFactory.Options options = new BitmapFactory.Options();
+                ActivityManager activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
+                if (activityManager.getMemoryClass() <= 64) {
+                    options.inSampleSize = 2; // Shrink quality
+                }
+                else {
+                    options.inSampleSize = 1; // Full quality
+                }
+                bitmap = BitmapFactory.decodeByteArray(student.getPhoto(), 0, student.getPhoto().length, options);
+            }
+            ImageView imageView = (ImageView) findViewById(R.id.student_photo);
+            imageView.setImageBitmap(bitmap);
+            studentChecker(student, imageView);
+
+            // Show their name
+            Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
+            toolbar.setSubtitle(student.getFullName());
+        }
+        else {