Create a Scheduled service in android

El Sa7eR picture El Sa7eR · Aug 30, 2012 · Viewed 12.6k times · Source

I need to create a schedule service in android with java. I have tried some codes , but all time after build the application it doesn't run. My logic is simple , I want to make a service to check the existence of a file in the bluetooth folder path, If this file is there , so this service will run another application , I need this with a schedule which run every 2 minutes.

Until now that's great, but now I have an error The method startActivity(Intent) is undefined for the type MyTimerTask. I have tried this code...

public class MyTimerTask extends TimerTask {
    java.io.File file = new java.io.File("/mnt/sdcard/Bluetooth/1.txt");

    public void run(){ 
        if (file.exists()) {
            Intent intent = new Intent(Intent.ACTION_MAIN);
            intent.setComponent(new ComponentName("com.package.address","com.package.address.MainActivity"));
            startActivity(intent);
        }
    } 
}

Could someone please help me with this.

Answer

Lucifer picture Lucifer · Aug 30, 2012

There are two ways to achieve your requirement.

  • TimerTask
  • Alarm Manager Class

    TimerTask has a method that repeats the activity on the given particular time interval. look at the following sample example.

    Timer timer; 
    MyTimerTask timerTask; 
    
    timer = new Timer(); 
    timerTask = new MyTimerTask();
    timer.schedule ( timerTask, startingInterval, repeatingInterval );
    
    private class MyTimerTask extends TimerTask 
    {
         public void run()
         { 
            ...
            // Repetitive Activity goes here
         } 
    }
    

    AlarmManager does same thing like TimerTask but as it occupies lesser memory to execute tasks.

    public class AlarmReceiver extends BroadcastReceiver 
    {
        @Override
        public void onReceive(Context context, Intent intent) 
        {
            try 
            {
                Bundle bundle = intent.getExtras();
                String message = bundle.getString("alarm_message");
                Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
            } 
            catch (Exception e) 
            {
                 Toast.makeText(context, "There was an error somewhere, but we still received an alarm", Toast.LENGTH_SHORT).show();
     e.printStackTrace();
            }
       }
    }
    

AlarmClass,

private static Intent alarmIntent = null;
private static PendingIntent pendingIntent = null;
private static AlarmManager alarmManager = null;

    // OnCreate()
    alarmIntent = new Intent ( null, AlarmReceiver.class );
    pendingIntent = PendingIntent.getBroadcast( this.getApplicationContext(), 234324243, alarmIntent, 0 );
alarmManager = ( AlarmManager ) getSystemService( ALARM_SERVICE );
    alarmManager.setRepeating( AlarmManager.RTC_WAKEUP, ( uploadInterval * 1000 ),( uploadInterval * 1000 ), pendingIntent );