列出Android设备中所有启动的服务，及判断某个服务是否开启

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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;  
    }  
}