Android学习：AsyncTask方案解决UI线程阻塞

private class testTask extends AsyncTask<String, Void, Integer> {

		protected Integer doInBackground(String... arg0) {
			try {
				Thread.sleep(5000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			int sum = 10;
			return 10;
		}

		protected void onPostExecute(Integer sum) {
			button2.setText("" + sum);
		}

	}