Android Handler Thread HandlerThread

Android Handler Thread HandlerThread

Handler.Callback callback = new Handler.Callback()


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    textView = findViewById(R.id.textView);
    button = findViewById(R.id.button);

    CC();
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            handler.sendEmptyMessage(99);
        }
    });
}

protected void CC() {
    HandlerThread handlerThread = new HandlerThread("test");
    handlerThread.start();

    Handler.Callback callback = new Handler.Callback() {
        @Override
        public boolean handleMessage(Message message) {
            System.out.println();
            System.out.println(Thread.currentThread().getName());
            System.out.println("0000000000000000000000000000000000000");
            return false;
        }
    };
    handler = new Handler(handlerThread.getLooper(), callback);
}