一.Activity的 runOnUiThread

new Thread(new Runnable() {
               @Override
                public void run() {
                    try {
                        Thread.sleep(3000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            bt.setText("哈哈");
                        }
                    });
                }
            }).start();

二.Handler sendEmptyMessage()/sendMessage()

1.首先需要?jiǎng)?chuàng)建Handler對象
private Handler mHandler = new Handler(){
    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        if (UPDATE == msg.what){
             //更新UI
        }
    }
};
2.創(chuàng)建子線程進(jìn)行耗時(shí)操作矾瑰，然后發(fā)送message
new Thread(new Runnable() {
        @Override
        public void run() {
            Message message = new Message();
            message.what = UPDATE;
            message.arg1 = 1;
            mHandler.sendMessage(message);
            mHandler.sendMessageAtTime(message,1000);
            mHandler.sendEmptyMessage(UPDATE);
            mHandler.sendEmptyMessageDelayed(UPDATE,10000);
            mHandler.sendMessageAtTime(message, SystemClock.uptimeMillis() + 10000); 
        }
    }).start();

三.Handler post()

post方法和sendMessage/sendEmptyMessage的效果一樣
如果主線程中，我們只需要開啟一個(gè)子線程的話，我們可以使用post方法，這樣可以省去判斷message.what的邏輯。
但如果是多個(gè)子線程筒严，則需要使用sendMessage
1.在主線程中首先創(chuàng)建Handler對象
  Handler handler = new Handler();
2.開啟子線程，耗時(shí)操作完畢后，調(diào)用handler.post方法
  new Thread(new Runnable() {
        @Override
        public void run() {
            //進(jìn)行耗時(shí)操作

            handler.post(new Runnable() {
                @Override
                public void run() {
                    //更新UI
                }
            });
        }
    }).start();

注意：Handler還有一個(gè)方法人柿，postDelayed(),延遲發(fā)送，傳入?yún)?shù)為Runnable對象和延遲時(shí)間

四.view Post()

new Thread(new Runnable() {
                    @Override
                    public void run() {
                        rv.postDelayed(new Runnable() {
                            @Override
                            public void run() {
                                //更新UI的操作
                            }
                        },5000);
                    }
                }).start();