我尝试使用下面的code拿到手机上当前设置的报警数量。

 开放的URI = Uri.parse（内容：//com.android.deskclock/AlarmClock）;
光标C = getApplicationContext（）getContentResolver（）查询（URI，NULL，NULL，NULL，NULL）;
 

但我得到一个 NullPointerException异常当我尝试使用，以获取数

  INT NUM = c.getCount（）;
的System.out.println（没有报警：+ c.getCount（））;
 

请让我知道我做错了什么？在getCount将（发生的除外）本身，所以我不能够显示的报警数量。

编辑：我也得到这个消息对我的LogCat中：

  ActivityThread（13290）：未能找到com.android.deskclock供应商信息
 

解决方案

在乌里你要找的是内容：//融为一体。 android.deskclock /报警，但您无法访问应用程序的的ContentProvider ，因为它不出口。你只是抛出一个 SecurityException异常。

I am trying to use the following code to get the number of alarms currently set on the phone.

Uri uri = Uri.parse("content://com.android.deskclock/AlarmClock");
Cursor c = getApplicationContext().getContentResolver().query(uri, null, null, null,null);

But I get a NullPointerException when I try to fetch the number using

int num = c.getCount();
System.out.println("No of alarms : "+c.getCount());

Please let me know what I am doing wrong ? The exception occurs in getCount() itself so I am not able to display the number of alarms.

EDIT: I also get this message on my LogCat :

ActivityThread(13290): Failed to find provider info for com.android.deskclock

The Uri you're looking for is content://com.android.deskclock/alarms, but you can't access the app's ContentProvider because it isn't exported. You'll just throw a SecurityException.