Android进阶教程之---列出Android设备中所有启动的服务，及判断某个服务是否

今天给大家的小例子是列出Android设备中所有启动的服务，及判断某个服务是否开启，具体步骤如下了:

第一步:新建一个Android工程，命名为RunningService。

第二步:修改RunningService.java代码如下：

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 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 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 mServiceList){
        String res = "";
        for(int i = 0; i < mServiceList.size(); i ++){
            res+=mServiceList.get(i).service.getClassName()+ " \n";
        }

        return res;
    }
}

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; } }

第三步:运行上述工程，查看效果!

不看不知道，一看吓一跳，乖乖，开了这么多服务，难怪手机很快就没电了。

上面的一些服务好多是系统自带的，并且不可见的，我们可以到Settings->Applications->Running services查看

一共才看到十来个服务。