android 判断service是否开启

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 package com.tutor.runningservice;

 import java.util.List;
 import android.app.Activity;
 import android.app.ActivityManager;
 import android.os.Bundle;
 import android.widget.TextView;

 public class RunningService extends Activity {

 /** Called when the activity is first created. */

 @Override
 public void onCreate(Bundle savedInstanceState) {

 super.onCreate(savedInstanceState);

 //setContentView(R.layout.main);
 TextView mTextView = new TextView(this);

 ActivityManager mActivityManager = (ActivityManager)getSystemService(ACTIVITY_SERVICE);

 List<ActivityManager.RunningServiceInfo> mServiceList = mActivityManager.getRunningServices(30);

 //我要判断的服务名字，我在launcher2里加了一个音乐服务
 final String musicClassName = "com.android.launcher2.MusicService";

 boolean b = MusicServiceIsStart(mServiceList, musicClassName);

 mTextView.setText("你要判断的服务状态为: " +b+"\n" + getServiceClassName(mServiceList));

 setContentView(mTextView);

 }

 //通过Service的类名来判断是否启动某个服务
 private boolean MusicServiceIsStart(List<ActivityManager.RunningServiceInfo> mServiceList,String className){

 for(int i = 0; i < mServiceList.size(); i ++)

 {

 if(className.equals(mServiceList.get(i).service.getClassName()))

 {
 return true;
 }

 }

 return false;

 }

 //获取所有启动的服务的类名
 private String getServiceClassName(List<ActivityManager.RunningServiceInfo> mServiceList){
 String res = "";

 for(int i = 0; i < mServiceList.size(); i ++){

 res+=mServiceList.get(i).service.getClassName()+ " \n";

 }

 return res;

 }
 }