Android编程判断当前指定App是否在前台的方法

//在进程中去寻找当前APP的信息，判断是否在前台运行private boolean isAppOnForeground() {ActivityManager activityManager =(ActivityManager) getApplicationContext().getSystemService(  Context.ACTIVITY_SERVICE);String packageName =getApplicationContext().getPackageName();List<RunningAppProcessInfo>appProcesses = activityManager.getRunningAppProcesses();if (appProcesses == null)return false;for (RunningAppProcessInfo appProcess : appProcesses) {if (appProcess.processName.equals(packageName)    && appProcess.importance == RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {  return true;}}return false;}