NPE在Environment.getExternalStorageState（）？ [英] NPE on Environment.getExternalStorageState()?

问题描述

找不到为什么我收到空指针异常的原因。我可以给一个明确的检查，看看是否getStorageState为空，但是，这并不说明为什么我收到此错误。 错误是：

 显示java.lang.NullPointerException
在android.os.Environment.getStorageState（Environment.java:719）
在android.os.Environment.getExternalStorageState（Environment.java:694）
在com.ciqual.android.insight.sessionService.RemoveFiles（SessionService.java:664）
com.vyshas.android.sessionService.onEndSession（SessionService.java:460）
 

在：（线路的错误指的是这样的：）（豆形软糖中的4.3和奇巧看到）

 如果（Environment.getExternalStorageState（）。等于（Environment.MEDIA_MOUNTED））{
            //
        }
 

解决方案

Environment.MEDIA_MOUNTED.equals（Environment.getExternalStorageState）wouldnt导致NPE而Environment.getExternalStorageState（）。等于（Environment.MEDIA_MOUNTED）不会导致NPE和崩溃应用程序。

我仍然不知道为什么getExternalStorageState为空eventhough我有设定权限，但解决方案ATLEAST不会崩溃的应用程序。

Cannot find the reason why I am getting "Null pointer exception" . I could give an explicit check to see if "getStorageState is null" but that doesnt explain why I am getting this error. The error is :

java.lang.NullPointerException
at android.os.Environment.getStorageState(Environment.java:719)
at android.os.Environment.getExternalStorageState(Environment.java:694)
at com.ciqual.android.insight.sessionService.RemoveFiles(SessionService.java:664)
com.vyshas.android.sessionService.onEndSession(SessionService.java:460)

at : (the line that error points to is this :)(seen in jellybean 4.3 and kitkat)

if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            //
        }

解决方案

Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState) wouldnt cause a NPE while Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED) does cause NPE and crashes the application.

I still dont know why getExternalStorageState is null eventhough I have permissions set but the solutions atleast wouldn't crash the application.

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