Android-无法从PHP获取JSON

我需要从这里获取数据。但当我这样做时，我得到空值：

{"teachers":[{"tid":"1","name":"g\u00f6ksel","surname":"biricik",,"tc":"12345678912","email":"goksel@ce.yildiz.edu.tr","avatar":"goksel.jpg"},{"tid":"2","name":"haydar","surname":"ayg\u00f6rmez",,"tc":"12345678913","email":"aygormez@gmail.com","avatar":"haydar.jpg"},{"tid":"48","name":"Caner","surname":"Ayd\u0131n",,"tc":"12345678914","email":"caneraydinbey@gmail.com","avatar":"caner.jpg"},{"tid":"92","name":"deneme","surname":"denemesoy",","tc":"12345678914","email":"deneme@gmail.com","avatar":"5292-1017.png"},{"tid":"93","name":"deneme2","surname":"denemesoy2",,"tc":"12345678915","email":"deneme2@gmail.com","avatar":"8446-1012.png"}],"success":1}

为什么我得到空值？没有警告或错误。我的天哪：

04-04 15:41:24.022 2131-2131/com.example.caneraydin.myapplication D/Chic: oncreate start
04-04 15:41:24.372 2131-2131/com.example.caneraydin.myapplication D/Chic: oncreate end
04-04 15:41:27.115 2131-2131/com.example.caneraydin.myapplication D/Chic: onpre
04-04 15:41:27.255 2131-2302/com.example.caneraydin.myapplication D/Chic: doin
04-04 15:41:27.485 2131-2131/com.example.caneraydin.myapplication D/Chic: json= null
04-04 15:44:19.623 5732-5732/com.example.caneraydin.myapplication D/Chic: oncreate start
04-04 15:44:19.753 5732-5732/com.example.caneraydin.myapplication D/Chic: oncreate end
04-04 15:46:26.537 5732-5732/com.example.caneraydin.myapplication D/Chic: onpre
04-04 15:46:26.697 5732-8187/com.example.caneraydin.myapplication D/Chic: doin
04-04 15:46:26.697 5732-8187/com.example.caneraydin.myapplication D/Chic: url http://oep.esy.es/android_get_all.php
04-04 15:46:26.867 5732-5732/com.example.caneraydin.myapplication D/Chic: json= null

我做的和这里一样

我试过这个，效果很好

---

返回字符串.valueOf（sb）

始终保持打印

异常的习惯，在
catch
块中，检查您是否得到任何
异常
add
e.printStackTrace（）内部捕捉块并编辑您的帖子。这对你和我们都有帮助。如何搜索普林斯塔克的帖子？我搜索所有日志以查找“异常”
04-04 15:41:24.022 2131-2131/com.example.caneraydin.myapplication D/Chic: oncreate start
04-04 15:41:24.372 2131-2131/com.example.caneraydin.myapplication D/Chic: oncreate end
04-04 15:41:27.115 2131-2131/com.example.caneraydin.myapplication D/Chic: onpre
04-04 15:41:27.255 2131-2302/com.example.caneraydin.myapplication D/Chic: doin
04-04 15:41:27.485 2131-2131/com.example.caneraydin.myapplication D/Chic: json= null
04-04 15:44:19.623 5732-5732/com.example.caneraydin.myapplication D/Chic: oncreate start
04-04 15:44:19.753 5732-5732/com.example.caneraydin.myapplication D/Chic: oncreate end
04-04 15:46:26.537 5732-5732/com.example.caneraydin.myapplication D/Chic: onpre
04-04 15:46:26.697 5732-8187/com.example.caneraydin.myapplication D/Chic: doin
04-04 15:46:26.697 5732-8187/com.example.caneraydin.myapplication D/Chic: url http://oep.esy.es/android_get_all.php
04-04 15:46:26.867 5732-5732/com.example.caneraydin.myapplication D/Chic: json= null

04-04 15:54:00.990 5732-5732/com.example.caneraydin.myapplication E/ViewRootImpl: sendUserActionEvent() mView == null