【Android】判断应用Application、Activity、Service是否处于活动状态

不念不忘少年蓝@ 2022-06-16 02:30 684阅读 0赞

通过**`ActivityManager`**我们可以获得系统里正在运行的activities，包括进程(Process)等、应用程序/包、服务(Service)、任务(Task)信息。

## **1、判断应用App是否活动** ##

/**
     * 判断应用是否已经启动
     * @param context 一个context
     * @param packageName 要判断应用的包名
     * @return boolean
     */
    private boolean isAppAlive(Context context, String packageName){
       ActivityManager activityManager =
               (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
       List<ActivityManager.RunningAppProcessInfo> processInfos
               = activityManager.getRunningAppProcesses();
       for(int i = 0; i < processInfos.size(); i++){
           if(processInfos.get(i).processName.equals(packageName)){
               Log.i("NotificationLaunch",
                       String.format("the %s is running, isAppAlive return true", packageName));
               return true;
           }
       }
       Log.i("NotificationLaunch",
               String.format("the %s is not running, isAppAlive return false", packageName));
       return false;
    }

## **2、判断Activity是否活动** ##

/**
     * 判断MainActivity是否活动
     * @param context 一个context
     * @param activityName 要判断Activity
     * @return boolean
    */
    private boolean isMainActivityAlive(Context context, String activityName){
       ActivityManager am = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
       List<ActivityManager.RunningTaskInfo> list = am.getRunningTasks(100);
       for (ActivityManager.RunningTaskInfo info : list) {
           // 注意这里的 topActivity 包含 packageName和className，可以打印出来看看
           if (info.topActivity.toString().equals(activityName) || info.baseActivity.toString().equals(activityName)) {
               Log.i(TAG,info.topActivity.getPackageName() + " info.baseActivity.getPackageName()="+info.baseActivity.getPackageName());
               return true;
           }
       }
       return false;
    }

## **3、Activity是否显示在前台** ##

/**
     * 检测某Activity是否在当前Task的栈顶
     */
    private boolean isTopActivity(String activityName){
        ActivityManager manager = (ActivityManager) mContext.getSystemService(ACTIVITY_SERVICE);
        List<ActivityManager.RunningTaskInfo> runningTaskInfos = manager.getRunningTasks(1);
        String cmpNameTemp = null;
        if(runningTaskInfos != null){
            cmpNameTemp = runningTaskInfos.get(0).topActivity.toString();
        }
        if(cmpNameTemp == null){
            return false;
        }
        return cmpNameTemp.equals(activityName);
    }

## **4、Service是否在运行** ##

/**  
     * 用来判断服务是否运行.  
     * @param context  
     * @param className 判断的服务名字  
     * @return true 在运行 false 不在运行  
     */  
    public static boolean isServiceRunning(Context mContext,String className) {   
        boolean isRunning = false;   
        ActivityManager activityManager = (ActivityManager)   
                                     mContext.getSystemService(Context.ACTIVITY_SERVICE);    
        //此处只在前30个中查找，大家根据需要调整                             
        List<ActivityManager.RunningServiceInfo> serviceList = activityManager.getRunningServices(30);   
        if (!(serviceList.size()>0)) {   
            return false;   
        }   
        for (int i=0; i<serviceList.size(); i++) {   
            if (serviceList.get(i).service.getClassName().equals(className) == true) {   
                isRunning = true;   
                break;   
            }   
        }   
        return isRunning;   
    }

--------------------

### 参考资料 ###

1、[Android中ActivityManager的使用案例][Android_ActivityManager]  
2、[Android实现点击通知栏后，先启动应用再打开目标Activity的一个小demo][Android_Activity_demo]  
3、[Android ActivityManager 检测Service与Activity是否正在运行][Android ActivityManager _Service_Activity]

[Android_ActivityManager]: http://blog.csdn.net/hp910315/article/details/49908203
[Android_Activity_demo]: https://github.com/slimhippo/androidcode/blob/master/NotificationLaunch/app/src/main/java/com/liangzili/notificationlaunch/SystemUtils.java
[Android ActivityManager _Service_Activity]: https://my.oschina.net/ososchina/blog/350498