How can I launch my service with notification by timing

Question

I'm working now with android to build an application that can launch notification everyday. Now I have a code that lunch a background service with a notification. I know that I have to use alarm service for pick the right time, but I don't know how to modify the code the make it service or notification display in one time everyday on the same time.

Code(MainActivity.java):

public class MainActivity extends AppCompatActivity {
    private EditText editTextInput;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    editTextInput = findViewById(R.id.edit_text_input);
}

public void startService(View v) {
    String input = editTextInput.getText().toString();

    Intent serviceIntent = new Intent(this, ExampleService.class);
    serviceIntent.putExtra("inputExtra", input);

    ContextCompat.startForegroundService(this, serviceIntent);
}

public void stopService(View v) {
    Intent serviceIntent = new Intent(this, ExampleService.class);
    stopService(serviceIntent);
}
}

App.java

public class App extends Application {
    public static final String CHANNEL_ID = "exampleServiceChannel";

@Override
public void onCreate() {
    super.onCreate();

    createNotificationChannel();
}

private void createNotificationChannel() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        NotificationChannel serviceChannel = new NotificationChannel(
                CHANNEL_ID,
                "Example Service Channel",
                NotificationManager.IMPORTANCE_DEFAULT
        );

        NotificationManager manager = getSystemService(NotificationManager.class);
        manager.createNotificationChannel(serviceChannel);
    }
}
}

Service:

public class ExampleService extends Service {

@Override
public void onCreate() {
    super.onCreate();
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    String input = intent.getStringExtra("inputExtra");

    Intent notificationIntent = new Intent(this, MainActivity.class);
    PendingIntent pendingIntent = PendingIntent.getActivity(this,
            0, notificationIntent, 0);

    Notification notification = new NotificationCompat.Builder(this, CHANNEL_ID)
            .setContentTitle("Example Service")
            .setContentText(input)
            .setSmallIcon(R.drawable.ic_android_black_24dp)
            .setContentIntent(pendingIntent)
            .build();

    startForeground(1, notification);

    //do heavy work on a background thread
    //stopSelf();

    return START_NOT_STICKY;
}

@Override
public void onDestroy() {
    super.onDestroy();
}

@Nullable
@Override
public IBinder onBind(Intent intent) {
    return null;
}

Thanks for your help.

Answer 1

alarm manager application to display notification:

Mainactivity.java:

TimePicker timePicker;


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

    //getting the timepicker object
    timePicker = (TimePicker) findViewById(R.id.timePicker);
    Button btn=(Button)findViewById(R.id.buttonAlarm);
    //attaching clicklistener on button
    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            //We need a calendar object to get the specified time in millis
            //as the alarm manager method takes time in millis to setup the alarm
            Calendar calendar = Calendar.getInstance();
            if (android.os.Build.VERSION.SDK_INT >= 23) {
                calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH),
                        timePicker.getHour(), timePicker.getMinute(), 0);
            } else {
                calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH),
                        timePicker.getCurrentHour(), timePicker.getCurrentMinute(), 0);
            }


            setAlarm(calendar.getTimeInMillis());
        }
    });
}

private void setAlarm(long time) {
    //getting the alarm manager
    AlarmManager am = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

    //creating a new intent specifying the broadcast receiver
    Intent i = new Intent(this, MyAlarm.class);

    //creating a pending intent using the intent
    PendingIntent pi = PendingIntent.getBroadcast(this, 0, i, 0);

    //setting the repeating alarm that will be fired every day
    am.setRepeating(AlarmManager.RTC, time, AlarmManager.INTERVAL_DAY, pi);
    Toast.makeText(this, "Alarm is set", Toast.LENGTH_SHORT).show();
}

Myalarm.java:

public class MyAlarm extends BroadcastReceiver {

//the method will be fired when the alarm is triggerred
@Override
public void onReceive(Context context, Intent intent) {

    //you can check the log that it is fired
    //Here we are actually not doing anything
    //but you can do any task here that you want to be done at a specific time everyday
    addNotification(context);
    Log.d("MyAlarmBelal", "Alarm just fired");
}
private void addNotification(Context context) {
    // Builds your notification
    NotificationCompat.Builder builder=new NotificationCompat.Builder(context);
    builder.setSmallIcon(R.mipmap.ic_launcher_round);
    builder.setContentTitle("John's Android Studio Tutorials");
    builder.setContentText("A video has just arrived!");

    // Creates the intent needed to show the notification
    Intent notificationIntent = new Intent();
    PendingIntent contentIntent = PendingIntent.getActivity(context , 0, notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
    builder.setContentIntent(contentIntent);

    // Add as notification
    NotificationManager manager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
    manager.notify(0, builder.build());
}
}

Answer 2

You don't need a service to just show a notification. Use alarm manager with broadcast receiver and write down your code to show alarm in the onReceive of the broadcast receiver.