android service and bind service

package com.example.servicedemo;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.IBinder;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity implements OnClickListener {

    
    Button btn1,btn2,btn3,btn4,btn5,btn6,btn7,btn8;
    private MyService myService;
    Activity activity = this;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        btn1 = (Button)findViewById(R.id.btn1);
        btn2 = (Button)findViewById(R.id.btn2);
        btn3 = (Button)findViewById(R.id.btn3);
        btn4 = (Button)findViewById(R.id.btn4);
        btn5 = (Button)findViewById(R.id.btn5);
        btn6 = (Button)findViewById(R.id.btn6);
        btn7 = (Button)findViewById(R.id.btn7);
        btn8 = (Button)findViewById(R.id.btn8);
        
        btn1.setOnClickListener(this);
        btn2.setOnClickListener(this);
        btn3.setOnClickListener(this);
        btn4.setOnClickListener(this);
        btn5.setOnClickListener(this);
        btn6.setOnClickListener(this);
        btn7.setOnClickListener(this);
        btn8.setOnClickListener(this);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

    private ServiceConnection connection = new ServiceConnection() {
        
        @Override
        public void onServiceDisconnected(ComponentName arg0) {
            // TODO Auto-generated method stub
            System.out.println("onServiceDisconnected");
            myService = null;
        }
        
        @Override
        public void onServiceConnected(ComponentName name, IBinder binder) {
            // TODO Auto-generated method stub
            System.out.println("Service连接成功");
            myService = ((MyService.MyBinder)binder).getService();
            myService.excute();
            System.out.println(((MyService.MyBinder)binder).getBinderName());
        }
    };
    
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch (v.getId()) {
        case R.id.btn1:
            Intent it1 = new Intent(this, MyService.class);
            startService(it1);
            break;
        case R.id.btn2:
            Intent it2 = new Intent(this, MyService.class);
            startService(it2);
            break;
        case R.id.btn3:
            Intent it3 = new Intent(this, MyService.class);
            startService(it3);
            break;
        case R.id.btn4:
            Intent it4 = new Intent(this, MyService.class);
            startService(it4);
            break;
        case R.id.btn5:
            //Intent it5 = new Intent(this,MyService.class);
            //bindService(it5, connection, Context.BIND_AUTO_CREATE);
            new MyThread().run();
            //unbindService(connection);
            break;
        case R.id.btn6:
            Intent it6 = new Intent(this,MyService.class);
            bindService(it6, connection, Context.BIND_AUTO_CREATE);
            
            break;
        case R.id.btn7:
            new MyTask().execute(new String[]{"aaa","bbb"});
            break;
        case R.id.btn8:
            break;
        default:
            break;
        }
    }
    //params,progress,result
    public class MyTask extends AsyncTask<String, String, String>{

        @Override
        protected String doInBackground(String... params) {
            // TODO Auto-generated method stub
            System.out.println("doinbackground:"+params.length+ "   "+params[0]);
            for(int i=0;i<10;i++){
                publishProgress(params[0]+" "+i);
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            return "return doinbackground";
        }

        @Override
        protected void onCancelled() {
            // TODO Auto-generated method stub
 
            System.out.println("onCancelled");
        }

        @Override
        protected void onPostExecute(String result) {
            // TODO Auto-generated method stub
            System.out.println("onPostExecute.==>"+result);
        }

        @Override
        protected void onPreExecute() {
            // TODO Auto-generated method stub
            System.out.println("onPreExecute");
        }

        @Override
        protected void onProgressUpdate(String... values) {
            // TODO Auto-generated method stub
            System.out.println("onProgressUpdate:"+values.length+"   "+values[0]);
        }
        
    }
    
    public class MyThread extends Thread{

        @Override
        public void run() {
            // TODO Auto-generated method stub
            super.run();
            
            Intent it6 = new Intent(activity,MyService.class);
            bindService(it6, connection, Context.BIND_AUTO_CREATE);
        }
        
    }
    
}

myservice:

package com.example.servicedemo;

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;

public class MyService extends Service {

    private final IBinder binder = new MyBinder();
    
    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        System.out.println("service onBind");
        for (int i = 0; i < 10; i++) {
            try {
                Thread.sleep(1000);
                System.out.println("onBind is sleeping."+i);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            
            
        }
        return binder;
    }

    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        super.onCreate();
        System.out.println("onCreate service");
    }

    @Override
    public void onStart(Intent intent, int startId) {
        // TODO Auto-generated method stub
        super.onStart(intent, startId);
        System.out.println("onStart service");
    }

    @Override
    public boolean onUnbind(Intent intent) {
        // TODO Auto-generated method stub
        System.out.println("退出binder");
        return super.onUnbind(intent);
    }
    
    public class MyBinder extends Binder{
        
        public String getBinderName(){
            return "MyBinder";
        }
        
        MyService getService(){
            return MyService.this;
        }
    }
    
    public void excute(){
        System.out.println("通过binder得到Service来引用service内部方法");
    }

}