Android開發基礎之Main線程向Worker線程發送消息

一 布局

二 代碼

    private Button button;
    private Handler handler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button = (Button)this.findViewById(R.id.button);
        button.setOnClickListener(new ButtonListener());

        WorkerThread thread = new WorkerThread();
        thread.start();
    }

    class ButtonListener implements View.OnClickListener {
        @Override
        public void onClick(View v) {
            Message msg = handler.obtainMessage();
            handler.sendMessage(msg);
        }
    }

    class WorkerThread extends Thread {
        public void run() {
            Looper.prepare();
            handler = new Handler(){
                public void handleMessage(Message msg){
                    System.out.println("Message From MainThread");
                }
            };
            Looper.loop();
        }
    }