Android notification example

Compile

# Optional
ANDROID_HOME=/home/.../android/sdk; export ANDROID_HOME

./gradlew compileDebug

Test

# Make sure emulator is running or connected to real device
./gradlew connectedInstrumentTest

Code highlights

Toast notification:

Toast.makeText(getApplicationContext(), R.string.greeting, Toast.LENGTH_SHORT).show();

Broadcast receiver to receive intente when download ends:

mRefreshReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        // Let sender know that the Intent was received
        // by setting result code to RESULT_OK
        if (intent.getAction().equals(DATA_REFRESHED_ACTION)) {
            setResultCode(RESULT_OK);
        }
    }
};
registerReceiver(mRefreshReceiver, intentFilter);

Sends an ordered broadcast:

	// Creates a new BroadcastReceiver to receive a result indicating the state of MainActivity

	// The Action for this broadcast Intent is MainActivity.DATA_REFRESHED_ACTION
	// The result Activity.RESULT_OK, indicates that MainActivity is active and
	// in the foreground.

	mApplicationContext.sendOrderedBroadcast(new Intent(MainActivity.DATA_REFRESHED_ACTION), null,
			new BroadcastReceiver() {

				final String failMsg = "Download has failed. Please retry Later.";
				final String successMsg = "Download completed successfully.";

				@Override
				public void onReceive(Context context, Intent intent) {
					if ( getResultCode() != Activity.RESULT_OK) {

						// TODO:  If so, create a PendingIntent using the restartMainActivityIntent and set its flags
						// to FLAG_UPDATE_CURRENT

						final PendingIntent pendingIntent = PendingIntent
								.getActivity(context, 0,
										restartMainActivtyIntent,
										PendingIntent.FLAG_UPDATE_CURRENT);
                        createNotification()
					}
				}
			},
			null,
			0,
			null,
			null);
}

Notification Area notification:

// Uses R.layout.custom_notification for the layout of the notification View.
RemoteViews mContentView = new RemoteViews(mApplicationContext.getPackageName(), R.layout.custom_notification);

// TODO: Set the notification View's text to reflect whether or the download completed successfully
if (success) {
    mContentView.setTextViewText(R.id.text, successMsg);
} else {
    mContentView.setTextViewText(R.id.text, failMsg);
}

// TODO: Use the Notification.Builder class to create the Notification. You will have to set several pieces of information.
Notification.Builder notificationBuilder = new Notification.Builder(context)
        .setTicker("ticker text")
        .setContentIntent(pendingIntent)
        .setSmallIcon(
                android.R.drawable.stat_sys_warning)
        .setAutoCancel(true)
        .setContent(mContentView);

// TODO: Send the notification
NotificationManager mNotificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.notify(MY_NOTIFICATION_ID, notificationBuilder.build());