[Android]两个子线程，事件传递

子线程向另外一个子线程使用handler发送消息

Thread nThread = new Thread() {
    @Override
    public void run() {
        Looper.prepare();  //获取当前线程的Looper，并prepare();
        mhandler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                if (msg.arg1 == 1) {
                    Log.v("mthread", "click" + Thread.currentThread().getName());
                    Toast.makeText(HandleThreadActivity.this, "handler msg", Toast.LENGTH_SHORT).show();
                }
            }
        };
        Looper.loop();  //looper开始处理消息。
    }
};

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_handle_thread);
    btn = (Button) findViewById(R.id.btn);
    nThread.start();
    btn.setOnClickListener(new View.OnClickListener() {
                               @Override
                               public void onClick(View view) {
                                   Log.v("mthread", "MainThread" + Thread.currentThread().getName());
                                   myThread = new MyThread();
                                   myThread.start();
                               }
                           }
    );
}

private class MyThread extends Thread {
    @Override
    public void run() {
        Log.v("mthread", "start" + Thread.currentThread().getName());
        try {
            Thread.sleep(1000);
            Message msg = new Message();
            msg.arg1 = 1;
            mhandler.sendMessage(msg);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}