/** 判斷程序是否在后臺運行 */public static boolean isRunBackground(Context context) {  ActivityManager activityManager = (ActivityManager) context      .getSystemService(Context.ACTIVITY_SERVICE);  List<RunningAppProcessInfo> appProcesses = activityManager      .getRunningAppProcesses();  for (RunningAppProcessInfo appProcess : appProcesses) {    if (appProcess.processName.equals(context.getPackageName())) {      if (appProcess.importance == RunningAppProcessInfo.IMPORTANCE_BACKGROUND) {        // 表明程序在后臺運行        return true;      } else {        return false;      }    }  }  return false;}/** 判斷程序是否在前臺運行（當前運行的程序） */public boolean isRunForeground() {  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;// 程序運行在前臺    }  }  return false;}