Category: android

In this post, I am going to introduce an android application for teachers. Android is the ideal platform for developing such an application due to the wide variety of devices it supports. This Android app for teachers support basic functionalities such as adding student to each class/department, save notes, make schedules for classes etc. It also provides a CGPA (Cumulative Grade Point Average) calculator that basically calculate grade point average from the given grade points.

The First Activity Contains a Grid view that provides the connection to basic activities. The Attendance module is added to take attendance and store it in a database. The scheduler is basically used to schedule a particular event so that teachers won’t be needing another application as reminder.

Notes provides an easier way to save notes easily and quickly. Notes can also be associated with a subject so that it will be popped up when the teacher takes attendance for that subject.

Profile Module provides support to view and edit student data, along with activity to add new students.

Simple sqlite database is used to store data through different tables.

 import android.app.Activity;  
 import android.database.Cursor;  
 import android.database.sqlite.SQLiteDatabase;  
 import android.util.Log;  
 import android.widget.Toast;  
 public class databaseHandler {  
   SQLiteDatabase database;  
   Activity activity;  
   public databaseHandler(Activity activity) {  
     this.activity = activity;  
     database = activity.openOrCreateDatabase("ASSIST", activity.MODE_PRIVATE, null);  
     createTable();  
   }  
   public void createTable()  
   {  
     try {  
       String qu = "CREATE TABLE IF NOT EXISTS STUDENT(name varchar(1000)," +  
           "cl varchar(100), " +  
           "regno varchar(100) primary key, contact varchar(100),roll integer);";  
       database.execSQL(qu);  
     }catch (Exception e)  
     {  
       Toast.makeText(activity,"Error Occured for create table",Toast.LENGTH_LONG).show();  
     }  
     try {  
       String qu = "CREATE TABLE IF NOT EXISTS ATTENDANCE(datex date," +  
           "hour int, " +  
           "register varchar(100) ,isPresent boolean);";  
       database.execSQL(qu);  
     }catch (Exception e)  
     {  
       Toast.makeText(activity,"Error Occured for create table",Toast.LENGTH_LONG).show();  
     }  
     try {  
       String qu = "CREATE TABLE IF NOT EXISTS NOTES(title varchar(100) not null," +  
           "body varchar(10000), cls varchar(1000), sub varchar(1000) ,datex TIMESTAMP default CURRENT_TIMESTAMP);";  
       database.execSQL(qu);  
     }catch (Exception e)  
     {  
       Toast.makeText(activity,"Error Occured for create table",Toast.LENGTH_LONG).show();  
     }  
     try {  
       String qu = "CREATE TABLE IF NOT EXISTS SCHEDULE(cl varchar(100),subject varchar(1000)," +  
           "timex time, day_week varchar(100));";  
       database.execSQL(qu);  
     }catch (Exception e)  
     {  
       Toast.makeText(activity,"Error Occured for create table",Toast.LENGTH_LONG).show();  
     }  
   }  
   public boolean execAction(String qu)  
   {  
     Log.i("databaseHandler", qu);  
     try {  
       database.execSQL(qu);  
     }catch (Exception e)  
     {  
       Log.e("databaseHandler", qu);  
       Toast.makeText(activity,"Error Occured for execAction",Toast.LENGTH_LONG).show();  
       return false;  
     }  
     return true;  
   }  
   Cursor execQuery(String qu)  
   {  
     try {  
       return database.rawQuery(qu,null);  
     }catch (Exception e)  
     {  
       Log.e("databaseHandler", qu);  
       Toast.makeText(activity,"Error Occured for execAction",Toast.LENGTH_LONG).show();  
     }  
     return null;  
   }  
 }  

database = activity.openOrCreateDatabase("ASSIST", activity.MODE_PRIVATE, null);

Main Activity

 <?xml version="1.0" encoding="utf-8"?>  
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
   android:orientation="vertical" android:layout_width="match_parent"  
   android:layout_height="match_parent"  
   android:padding="10dp"  
   >  
   <GridView  
     android:layout_width="match_parent"  
     android:numColumns="2"  
     android:id="@+id/grid"  
     android:background="#e7e7e7"  
     android:columnWidth="150dp"  
     android:gravity="center"  
     android:verticalSpacing="10dp"  
     android:horizontalSpacing="10dp"  
     android:stretchMode="columnWidth"  
     android:layout_height="match_parent">  
   </GridView>  
 </ LinearLayout >  

The Grid Layout has both width and height and Match Parent so that it will fit into the whole screen.

BaseActivity.java

 import android.app.Activity;  
 import android.content.Intent;  
 import android.database.Cursor;  
 import android.database.sqlite.SQLiteDatabase;  
 import android.support.design.widget.FloatingActionButton;  
 import android.support.design.widget.Snackbar;  
 import android.support.v7.app.AppCompatActivity;  
 import android.os.Bundle;  
 import android.util.Log;  
 import android.view.Menu;  
 import android.view.MenuInflater;  
 import android.view.MenuItem;  
 import android.view.View;  
 import android.widget.Button;  
 import android.widget.EditText;  
 import android.widget.GridView;  
 import java.util.ArrayList;  

 public class AppBase extends AppCompatActivity {  
   private ArrayList<String> basicFields;  
   private gridAdapter adapter;  
   public static ArrayList<String> divisions ;  
   private GridView gridView;  
   public static databaseHandler handler;  
   public static Activity activity;  
   @Override  
   public boolean onCreateOptionsMenu(Menu menu) {  
     super.onCreateOptionsMenu(menu);  
     MenuInflater inflater = getMenuInflater();  
     inflater.inflate(R.menu.mai_menu, menu);  
     return true;  
   }  
   @Override  
   protected void onCreate(Bundle savedInstanceState) {  
     super.onCreate(savedInstanceState);  
     setContentView(R.layout.base_layout);  
     basicFields = new ArrayList<>();  
     handler = new databaseHandler(this);  
     activity = this;  
     getSupportActionBar().show();  
     divisions = new ArrayList();  
     divisions.add("S1 COMPUTER SCIENCE");  
     divisions.add("S2 COMPUTER SCIENCE");  
     divisions.add("S3 COMPUTER SCIENCE");  
     divisions.add("S4 COMPUTER SCIENCE");  
     divisions.add("S5 COMPUTER SCIENCE");  
     divisions.add("S6 COMPUTER SCIENCE");  
     divisions.add("S7 COMPUTER SCIENCE");  
     gridView = (GridView)findViewById(R.id.grid);  
     basicFields.add("ATTENDANCE");  
     basicFields.add("SCHEDULER");  
     basicFields.add("NOTES");  
     basicFields.add("PROFILE");  
     basicFields.add("CGPA CALCULATOR");  
     adapter = new gridAdapter(this,basicFields);  
     gridView.setAdapter(adapter);  
   }  
   public void loadSettings(MenuItem item) {  
     Intent launchIntent = new Intent(this,SettingsActivity.class);  
     startActivity(launchIntent);  
   }  
   public void loadAbout(MenuItem item) {  
     Intent launchIntent = new Intent(this,About.class);  
     startActivity(launchIntent);  
   }  
 }  

From the onCreate() method, we have inflated the xml layout. The database handler is defined as a public static variable so that it can be accessed from all other activities without the need of declaration and initialization. I have used a custom adapter for the grid view called gridAdapter.

adapter = new gridAdapter(this,basicFields);

gridView.setAdapter(adapter);  

Custom Grid Adapter

 import android.app.Activity;  
 import android.app.AlertDialog;  
 import android.app.Dialog;  
 import android.app.DialogFragment;  
 import android.app.FragmentManager;  
 import android.app.Notification;  
 import android.app.NotificationManager;  
 import android.app.PendingIntent;  
 import android.content.DialogInterface;  
 import android.content.Intent;  
 import android.content.SharedPreferences;  
 import android.database.Cursor;  
 import android.net.Uri;  
 import android.os.Bundle;  
 import android.preference.PreferenceManager;  
 import android.provider.Settings;  
 import android.support.v4.app.NotificationCompat;  
 import android.util.Log;  
 import android.view.LayoutInflater;  
 import android.view.View;  
 import android.view.ViewGroup;  
 import android.view.animation.Animation;  
 import android.view.animation.ScaleAnimation;  
 import android.widget.ArrayAdapter;  
 import android.widget.BaseAdapter;  
 import android.widget.DatePicker;  
 import android.widget.EditText;  
 import android.widget.ImageView;  
 import android.widget.Spinner;  
 import android.widget.TextView;  
 import android.widget.Toast;  
 import java.util.ArrayList;  
 import java.util.StringTokenizer;  
 public class GridAdapter extends BaseAdapter{  
   private ArrayList<String> names;  
   public static Activity activity;  
   public gridAdapter(Activity activity, ArrayList names) {  
     this.activity = activity;  
     this.names = names;  
   }  
   @Override  
   public int getCount() {  
     return names.size();  
   }  
   @Override  
   public Object getItem(int position) {  
     return names.get(position);  
   }  
   @Override  
   public long getItemId(int position) {  
     return position;  
   }  
   @Override  
   public View getView(int position, View v, ViewGroup parent) {  
     if (v == null) {  
       LayoutInflater vi = LayoutInflater.from(activity);  
       v = vi.inflate(R.layout.grid_layout, null);  
     }  
     TextView textView = (TextView)v.findViewById(R.id.namePlacer);  
     ImageView imageView = (ImageView)v.findViewById(R.id.imageHolder);  
     if(names.get(position).toString().equals("ATTENDANCE"))  
     {  
       imageView.setImageResource(R.drawable.ic_attendance);  
       v.setOnClickListener(new View.OnClickListener() {  
         @Override  
         public void onClick(View v) {  
           FragmentManager fm = activity.getFragmentManager();  
           createRequest request = new createRequest();  
           request.show(fm,"Select");  
         }  
       });  
     }else if(names.get(position).toString().equals("SCHEDULER"))  
     {  
       imageView.setImageResource(R.drawable.ic_schedule);  
       v.setOnClickListener(new View.OnClickListener() {  
         @Override  
         public void onClick(View v) {  
           Intent launchinIntent = new Intent(activity, scheduler.class);  
           activity.startActivity(launchinIntent);  
         }  
       });  
     }else if(names.get(position).toString().equals("NOTES"))  
     {  
       imageView.setImageResource(R.drawable.ic_notes);  
       v.setOnClickListener(new View.OnClickListener() {  
         @Override  
         public void onClick(View v) {  
           Intent launchinIntent = new Intent(activity, noteActivity.class);  
           activity.startActivity(launchinIntent);  
         }  
       });  
     }else if(names.get(position).toString().equals("PROFILE"))  
     {  
       imageView.setImageResource(R.drawable.ic_profile);  
       v.setOnClickListener(new View.OnClickListener() {  
         @Override  
         public void onClick(View v) {  
           Intent launchinIntent = new Intent(activity, profile_activity.class);  
           activity.startActivity(launchinIntent);  
         }  
       });  
     }  
     else if(names.get(position).toString().equals("CGPA CALCULATOR"))  
     {  
       imageView.setImageResource(R.drawable.ic_cgpa);  
       v.setOnClickListener(new View.OnClickListener() {  
         @Override  
         public void onClick(View v) {  
           Intent launchinIntent = new Intent(activity, cgpa_activity.class);  
           activity.startActivity(launchinIntent);  
         }  
       });  
     }  
     textView.setText(names.get(position).toString());  
     return v;  
   }  
   public static class createRequest extends DialogFragment {  
     @Override  
     public void onCreate(Bundle savedInstanceState) {  
       super.onCreate(savedInstanceState);  
     }  
     @Override  
     public Dialog onCreateDialog(Bundle savedInstanceState) {  
       AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());  
       // Get the layout inflater  
       LayoutInflater inflater = getActivity().getLayoutInflater();  
       final View v = inflater.inflate(R.layout.pick_period, null);  
       final DatePicker datePicker = (DatePicker) v.findViewById(R.id.datePicker);  
       final EditText hour = (EditText)v.findViewById(R.id.periodID);  
       final Spinner spn = (Spinner) v.findViewById(R.id.spinnerSubject);  
       String qu = "SELECT DISTINCT sub FROM NOTES";  
       ArrayList<String> subs = new ArrayList<>();  
       subs.add("Not Specified");  
       Cursor cr = AppBase.handler.execQuery(qu);  
       if(cr!=null)  
       {  
         cr.moveToFirst();  
         while(!cr.isAfterLast()) {  
           subs.add(cr.getString(0));  
           Log.d("gridAdapter.class", "Cached " + cr.getString(0));  
           cr.moveToNext();  
         }  
       }else  
         Log.d("gridAdapter.class", "No SUBS" + cr.getString(0));  
       ArrayAdapter<String> adapterSpinner = new ArrayAdapter<String>(activity, android.R.layout.simple_spinner_dropdown_item, subs);  
       assert spn != null;  
       spn.setAdapter(adapterSpinner);  
       builder.setView(v)  
           // Add action buttons  
           .setPositiveButton("Enter", new DialogInterface.OnClickListener() {  
             @Override  
             public void onClick(DialogInterface dialog, int id) {  
               int day = datePicker.getDayOfMonth();  
               int month = datePicker.getMonth() + 1;  
               int year = datePicker.getYear();  
               String date = year + "-" + month + "-" + day;  
               String subject = spn.getSelectedItem().toString();  
               String qx = "SELECT title FROM NOTES where sub = '" + subject + "'";  
               Cursor cr = AppBase.handler.execQuery(qx);  
               String subnames = "";  
               if(cr!=null)  
               {  
                 cr.moveToFirst();  
                 while(!cr.isAfterLast()) {  
                   subnames += (cr.getString(0)) + "n";  
                   cr.moveToNext();  
                 }  
               }  
               makeNotification(subnames);  
               Cursor cursor = AppBase.handler.execQuery("SELECT * FROM ATTENDANCE WHERE datex = '" +  
                   date +"' AND hour = " + hour.getText() + ";");  
               if(cursor==null||cursor.getCount()==0)  
               {  
                 Intent launchinIntent = new Intent(AppBase.activity, attendanceActivity.class);  
                 launchinIntent.putExtra("DATE", date);  
                 launchinIntent.putExtra("PERIOD", hour.getText().toString());  
                 AppBase.activity.startActivity(launchinIntent);  
               }else {  
                 Toast.makeText(getActivity(),"Period Already Added",Toast.LENGTH_LONG).show();  
               }  
             }  
           })  
           .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {  
             public void onClick(DialogInterface dialog, int id) {  
               dialog.dismiss();  
             }  
           });  
       return builder.create();  
     }  
   }  
   public static void makeNotification(String userIntrouble) {  
     Log.d("NOTIFICATION","Building..........");  
     Intent notificationIntent = new Intent(activity.getApplicationContext(), noteActivity.class);  
     PendingIntent pIntent = PendingIntent.getActivity(activity, 0, notificationIntent,  
         0);  
     SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(activity.getBaseContext());  
     Uri ring = Uri.parse(sharedPrefs.getString("Notification_Sound", Settings.System.DEFAULT_RINGTONE_URI.toString()));  
     NotificationCompat.Builder builder = new NotificationCompat.Builder(activity.getBaseContext())  
         .setTicker("Ticker Title").setContentTitle("Notes Are Available For this subject")  
         .setSmallIcon(R.drawable.ic_notes)  
         .setStyle(new NotificationCompat.BigTextStyle().bigText(userIntrouble))  
         .setContentIntent(pIntent)  
         .setSound(ring);  
     Notification noti = builder.build();  
     noti.contentIntent = pIntent;  
     noti.flags = Notification.FLAG_AUTO_CANCEL;  
     NotificationManager notificationManager = (NotificationManager) activity.getSystemService(activity.NOTIFICATION_SERVICE);  
     notificationManager.notify(0, noti);  
   }  
 }  

The custom adapter GridAdapter extends Android’s BaseAdapter and implements its methods. In the getView method, we have inflated both the title and ImageView using an if-else case.

Attendance Activity Create Dialog

Create request dialog is created when the user clicks on Attendance view in the Grid Layout. An onClickListener is added for the view v in the above code.

The dialog takes the date and hour(period) along with subject which is to be taken by the teacher. A notification module is added which will notify the teacher about the notes available for that particular subject once they click on the Enter option. Moreover clicking the Enter will launch new Activity called AttendanceActivity.

 Intent launchinIntent = new Intent(AppBase.activity, attendanceActivity.class);  
 launchinIntent.putExtra("DATE", date);  
 launchinIntent.putExtra("PERIOD", hour.getText().toString());  
 AppBase.activity.startActivity(launchinIntent);  

Settings Activity

Setting activity provides option to clear application data. It wipes all the data from the database once selected.

The following data can be cleared.

1. Schedule created
2. Attendance data
3. Notes saved
4. Student Info

pref_general.xml

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">  
 <Preference  
   android:title="Clear Schedule data"  
   android:summary="Clear all schedules"  
   android:key="clear_schedule"/>  
   <Preference  
     android:title="Clear Attendance data"  
     android:summary="Clear all Attendance Data"  
     android:key="clear_attendance"/>  
   <Preference  
     android:title="Clear Notes data"  
     android:summary="Clear all Notes Data"  
     android:key="clear_notes"/>  
   <Preference  
     android:title="Clear Student data"  
     android:summary="Clear all Student Data"  
     android:key="clear_student"/>  
 </PreferenceScreen>  

addPreferencesFromResource(R.xml.pref_general)

Then for each preference entry event handler is provided using the code.

 Preference myPref = findPreference("clear_schedule");  
     myPref.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {  
       public boolean onPreferenceClick(Preference preference) {  
          //DO ACTION HERE  
 }  

Download From Google Drive

Screenshots:-