判斷某個Activity是否在前臺顯示

判斷某個Activity是否在前臺顯示 http://write.blog.csdn.net/postedit?ref=toolbar

span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);"><span style="font-size:14px;">主要是記錄下來，供以後用到時參考</span></span>
/**
    * 判斷某個界面是否在前臺
    *
    * @param context
    * @param className
    *            某個界面名稱
    */
   private boolean isForeground(Context context, String className) {
       if (context == null || TextUtils.isEmpty(className)) {
           return false;
       }

       ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
       List<RunningTaskInfo> list = am.getRunningTasks(1);
       if (list != null && list.size() > 0) {
           ComponentName cpn = list.get(0).topActivity;
           if (className.equals(cpn.getClassName())) {
               return true;
           }
       }

       return false;
   }




注：使用次方法，必須加上以下權限否則會報錯


<uses-permission android:name="android.permission.GET_TASKS"/>