android如何使用服务

package com.example.yabushan.hello3;

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

public class MyService extends Service {

    private boolean SERVICE_STATE=true;//为true时，将执行onStartCommand里面的线程

    public MyService() {

    }
    @Override
    public IBinder onBind(Intent intent) {
        return new Binder();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {//
        System.out.println("startCommand");
        new Thread(){
            @Override
            public void run() {
                super.run();
                while(SERVICE_STATE){
                    System.out.println("服务在运行。。。");
                    try {
                        sleep(2000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }.start();

        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onCreate() {
        super.onCreate();
        System.out.println("service create");
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        System.out.println("service destroy");
        SERVICE_STATE=false;
    }
}

package com.example.yabushan.hello3;

import android.app.Activity;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.view.View;


public class MainActivity extends Activity implements View.OnClickListener, ServiceConnection {

    Intent intent;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.my_layout);
        intent=new Intent(MainActivity.this,MyService.class);
                findViewById(R.id.startService).setOnClickListener(this);
                findViewById(R.id.stopService).setOnClickListener(this);
                findViewById(R.id.bindService).setOnClickListener(this);
                findViewById(R.id.unbindService).setOnClickListener(this);

        }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.startService:
                startService(intent);break;
            case R.id.stopService:
                stopService(intent);break;
            case R.id.bindService:
                bindService(intent,this, Context.BIND_AUTO_CREATE);break;
            case R.id.unbindService:
                unbindService(this);break;


        }

    }
    @Override
    protected void onStart() {
        super.onStart();
    }

    @Override
    protected void onResume() {
        super.onResume();
    }

    @Override
    protected void onPause() {
        super.onPause();
    }

    @Override
    protected void onStop() {
        super.onStop();
    }

    @Override
    protected void onRestart() {
        super.onRestart();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
    }


    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        System.out.println("服务绑定成功");

    }

    @Override
    public void onServiceDisconnected(ComponentName name) {
        System.out.println("服务解绑成功");

    }
}