show toast in specific time every day

Question

I want to make simple android app that will show a toast in specific time every day say at 8:00 pm. How do I do it? On what I should depend? alarm manager and broadcast receiver? and in broadcast file how can i define between two events,alarm broadcast and receive new incoming sms broadcast using this outgoing call action

if (intent.getAction().equals(Intent.ACTION_NEW_OUTGOING_CALL)) {

 if (intent.getAction().equals(TelephonyManager.ACTION_PHONE_STATE_CHANGED)) {

Answer 1

AlarmReceiver.java

public class AlarmReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // any action you want to perform will come here
        Toast.makeText(context, "I'm running", Toast.LENGTH_SHORT).show();
    }
}

MainActivity.java

public class MainActivity extends Activity {
    private PendingIntent pendingIntent;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        /* Retrieve a PendingIntent that will perform a broadcast */
        Intent alarmIntent = new Intent(MainActivity.this, AlarmReceiver.class);
        pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, alarmIntent, 0);

        setAlarm();

    }

    private void setAlarm() {
        AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        int interval = 1000 * 60 * 20;

        /* Set the alarm to start at 8.00 PM */
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(System.currentTimeMillis());
        calendar.set(Calendar.HOUR_OF_DAY, 20);
        calendar.set(Calendar.MINUTE, 00);

        /* Repeating on every 20 minutes interval */
        manager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
            1000 * 60 * 20, pendingIntent);

    }

    public void cancelAlarm() {
        AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        manager.cancel(pendingIntent);
        Toast.makeText(this, "Alarm Canceled", Toast.LENGTH_SHORT).show();
    }

The below class is to keep the alarm even after the device reboot.

DeviceBootReceiver.java

public class DeviceBootReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) {
            /* Setting the alarm here */
            Intent alarmIntent = new Intent(context, AlarmReceiver.class);
            PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, alarmIntent, 0);

            AlarmManager manager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
            int interval = 8000;
            manager.setInexactRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), interval, pendingIntent);

            Toast.makeText(context, "Alarm Set", Toast.LENGTH_SHORT).show();
        }
    }
}

In manifest:

Add permission

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>

and receivers

 <receiver android:name=".AlarmReceiver">
      <intent-filter>
           <action android:name="android.intent.action.BOOT_COMPLETED"/>
      </intent-filter>
 </receiver>

<receiver android:name=".DeviceBootReceiver"
        android:enabled="false">
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED"/>
        </intent-filter>
</receiver>