Handler & Thread - Alternative 2

MainActivity.java

//...

final Handler handler = new Handler();
final Runnable uiRunnable = new Runnable() {
	@Override
	public void run() {
		 mTextView.setText(mResult);
	}
};

Thread thread = new Thread(new Runnable() {
	public void run() {
		mResult = performBlockingTask();
		handler.post(uiRunnable);
	}
});

thread.start();

//...