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;
    }
}