Android异步通信中实现子线程的定时启动

在子线程的run方法中加入

handler.postDelayed(this,1000);

此处的handler是Handler的实例化对象。
this指向的是一个实现了Runnable接口的内部类
这行代码的作用为1s后再次开启这个线程

完整的实现安卓界面中的定时功能的代码

public class MainActivity extends AppCompatActivity {    private TextView textView;    Handler handler=new Handler(){        @Override        public void handleMessage(@NonNull Message msg) {            super.handleMessage(msg);            switch (msg.what){                case 0:                    textView.setText("结束");                    break;                 default:                     textView.setText(msg.arg1+"");                    break;            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        textView = findViewById(R.id.textview1);        new Thread(new MyRunable()).start();    }    int time=10;    private class MyRunable implements Runnable{        @Override        public void run() {            //发送消息            Log.i("testT","   "+time+"");            if (time<=0){                //发送结束                handler.sendEmptyMessage(0);            }else{                Message message=new Message();                message.what=1;                message.arg1=time;                handler.sendMessage(message);                handler.postDelayed(this,1000);                time--;            }            }    };}

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