Tag: Handler

In the last Article you saw how to call an IntentService. Then you printed a Log statement in the background thread, once the service completed.

If you want to display a message in the Main Thread then you can use a Handler. A Handler allows you to access the Main Thread once the service is complete.

Here is the sample source code to achieve this.

    @Override
    protected void onHandleIntent(Intent intent) {
        Log.v(TAG, "In onHandleIntent. Message will be printed after 10sec");
        if (intent != null) {
            synchronized (this){
                try {
                    wait(10000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                Log.v(TAG, "Service started");
                mHandler.post(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(getApplicationContext(), "Service Completed" , Toast.LENGTH_SHORT).show();
                    }
                });
            }
        }
    }

Complete source code is available here.