public class DelayedMessageService extends IntentService{

    public static final String EXTRA_MESSAGE = "message";
    private Handler handler;

    public DelayedMessageService(){
        super("DelayedMessageService");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId){
        handler = new Handler();
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        synchronized (this){
            try{
                wait(10000);
            }catch (InterruptedException e){
                e.printStackTrace();
            }
        }
        String text = intent.getStringExtra(EXTRA_MESSAGE);
        showText(text);
    }


    private void showText(final String text){
        handler.post(new Runnable() {
            @Override
            public void run() {
                Toast.makeText(getApplicationContext(), text, Toast.LENGTH_SHORT).show();
            }
        });
    }
}