千变万化，都离不开基础 ，基础越牢固，，走的越远，

message发送的几种方式，看源码最好了。

private class  MyThread implements Runnable{
        @Override
        public void run() {
            /**
             * 第一种方式
             */
//            Message message=Message.obtain();
//            message.what=1;
//            message.arg1=2;
//            message.arg2=3;
//            message.obj="wo de dongxi";
//            mHandler.sendMessage(message);
            /**
             * 第二种
             */
//            Message message=Message.obtain(mHandler);
//            message.what=1;
//            message.arg1=2;
//            message.arg2=3;
//            message.obj="wo de dongxi";
//            message.sendToTarget();
            /**
             * 第三种
             */
//            Message message=Message.obtain(mHandler,33,1,2,"haha");
//            message.sendToTarget();
            /**
             * 第四种
             */
            Message message=Message.obtain(mHandler,33,1,2,"haha");
            Bundle mBundle=new Bundle();
            mBundle.putStringArray("handler",new String[]{"java","android","html"});
            message.setData(mBundle);
            message.sendToTarget();

        }
    }

handler的发送消息，不用message，用handler自带的开启发送，

   new Thread(new Runnable() {
                @Override
                public void run() {
                    /**
                     * 几秒之后发送消息
                     */
//                    mHandler.sendEmptyMessage(3);
//                    mHandler.sendEmptyMessageAtTime(3,1000);
//                    mHandler.sendEmptyMessageDelayed(3,3000);
                }
            }).start();

        }else if (v==mB2){
            /**
             * 有一种发送消息
             */
            mHandler.post(new Runnable() {
                @Override
                public void run() {
                    mHandler.sendEmptyMessage(3);
                }
            });
            /**
             * 四秒发送
             */
            mHandler.postDelayed(new Runnable() {
                @Override
                public void run() {

                }
            },4);

子线城用法

private class MyThread implements Runnable{
    @Override
    public void run() {
        android.os.Looper.prepare();
        mHandler=new Handler(){
            @Override
            public void handleMessage(Message msg) {
                super.handleMessage(msg);
                Log.d("Looper",msg.obj.toString());
                mView.setText(msg.obj.toString());

            }
        };
        android.os.Looper.loop();

    }

原文链接：http://www.apkbus.com/blog-340477-72620.html