Question

Is the sub thread can operate UI? Or it can only use handler to operate in main thread. But I use this code. It did not launch the error. Is anyone has ideas?

new Thread(new Runnable() {
            public void run() {
                TextView tv=(TextView) findViewById(R.id.aaa);
                tv.setText("111");
            }
        }).start();

Answer 1

No, you cannot perform UI operation from a different thread. If you want to update the UI, you must use handlers. Alternatively you can also use async tasks or Activity.runOnUiThread.