判断app是否已启动

最近做推送通知，需要判断应用程序是否已经启动，下面是一个方法可以判断本应用是否启动

/**
* packName  应用的包名
* 返回值
*/
public static 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;
}