Android(安卓)多线程更新控件

package com.example.androidapp;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.app.Activity;import android.view.Menu;import android.view.View;import android.widget.Button;import android.widget.TextView;public class MainActivity extends Activity {private TextView textView1=null;private Button startButton=null;private Button endButton=null;/*创建Handler对象，作为进程传递postDelayed之用*/private Handler objHandler=new Handler();/* 在MainActivity中定义Handler对象作为成员变量 * 通过Handler这个对象对主线程中的控件进行更新 * */private Handler handler=new Handler(){public void handleMessage(Message msg){switch (msg.what) {case 0:/*取出参数更新控件*/textView1.setText(msg.getData().getString("counter"));break;default:break;}super.handleMessage(msg);}};private Runnable myRunnable=new Runnable() {private int counter=0;@Overridepublic void run() {/*传参*/        Message msg=new Message();        msg.what=0;        Bundle bundle=new Bundle();        bundle.putString("counter", String.valueOf(++counter));        msg.setData(bundle);        /*发送信息到Handler*/        handler.sendMessage(msg);        /*再次调用此Runnable对象，以实现每1秒实现一次的定时器操作*/        objHandler.postDelayed(myRunnable, 1000);}};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);textView1=(TextView)findViewById(R.id.textView1);/*开始线程*/startButton=(Button)findViewById(R.id.startButton);startButton.setOnClickListener(new Button.OnClickListener() {@Overridepublic void onClick(View v) {/*开始线程,调用Runnable*/objHandler.post(myRunnable);}});/*结束线程*/endButton=(Button)findViewById(R.id.endButton);endButton.setOnClickListener(new Button.OnClickListener() {@Overridepublic void onClick(View v) {/*结束线程，删除mTask运行线程*/objHandler.removeCallbacks(myRunnable);}});}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}
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