handler------post传送方式

 package com.qianfeng.gp08_day26_hanlder2;

 import android.os.Bundle;
 import android.os.Handler;
 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 textView;
     private Button btn1,btn2;
     private Handler handler = new Handler();
     private int count;
     private boolean isStop;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         textView = (TextView) findViewById(R.id.textView);
         btn1 = (Button) findViewById(R.id.btn1);
         btn2 = (Button) findViewById(R.id.btn2);

         btn2.setEnabled(false);

     }

     public void startTime(View v)//开始计时
     {
         isStop = false;
         btn1.setEnabled(false);
         btn2.setEnabled(true);
         new Thread(new Runnable(){

             @Override
             public void run() {
                 // TODO 向主线程发送计数
                  count=0;
                 while(!isStop)
                 {
                     handler.post(new Runnable(){
                         @Override
                         public void run() {
                             textView.setText("计数器："+count++);
                         }
                     });
                     try {
                         Thread.sleep(1000);
                     } catch (InterruptedException e) {
                         e.printStackTrace();
                     }
                 }
             }

         }).start();
     }

     public void stopTime(View v)
     {
         btn1.setEnabled(true);
         btn2.setEnabled(false);
         isStop = true;
     }
 }

mainActivity