android 判断service是否开启

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;

} 
}