mediaStorageDir.mkdirs（）不创建目录

有没有人知道解决这个问题的方法？我正在使用照相机意图拍照。以下方法会生成存储图片的文件。但是，mkdirs()无法在设备上创建目录。在这种情况下我有什么选择？mediaStorageDir.mkdirs（）不创建目录

private static File getOutputMediaFile() { 
    File mediaStorageDir = new File(
     Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), 
     "MyCameraApp"); 
    if (!mediaStorageDir.exists()) { 
     if (!mediaStorageDir.mkdirs()) { 
      Log.d("MyCameraApp", "failed to create directory"); 
      return null; 
     } 
    } 
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss") 
     .format(new Date()); 
    return new File(mediaStorageDir.getPath() + File.separator + "IMG_" 
     + timeStamp + ".jpg"); 
}

错误日志：

04-20 09:56:07.370: D/MyCameraApp(809): failed to create directory 
04-20 09:56:07.370: D/AndroidRuntime(809): Shutting down VM 
04-20 09:56:07.370: W/dalvikvm(809): threadid=1: thread exiting with uncaught exception (group=0x40a13300) 
04-20 09:56:07.441: E/AndroidRuntime(809): FATAL EXCEPTION: main 
04-20 09:56:07.441: E/AndroidRuntime(809): java.lang.IllegalStateException: Could not execute method of the activity 
04-20 09:56:07.441: E/AndroidRuntime(809): at android.view.View$1.onClick(View.java:3591) 
04-20 09:56:07.441: E/AndroidRuntime(809): at android.view.View.performClick(View.java:4084) 
04-20 09:56:07.441: E/AndroidRuntime(809): at android.view.View$PerformClick.run(View.java:16966) 
04-20 09:56:07.441: E/AndroidRuntime(809): at android.os.Handler.handleCallback(Handler.java:615) 
04-20 09:56:07.441: E/AndroidRuntime(809): at android.os.Handler.dispatchMessage(Handler.java:92) 
04-20 09:56:07.441: E/AndroidRuntime(809): at android.os.Looper.loop(Looper.java:137) 
04-20 09:56:07.441: E/AndroidRuntime(809): at android.app.ActivityThread.main(ActivityThread.java:4745) 
04-20 09:56:07.441: E/AndroidRuntime(809): at java.lang.reflect.Method.invokeNative(Native Method) 
04-20 09:56:07.441: E/AndroidRuntime(809): at java.lang.reflect.Method.invoke(Method.java:511) 
04-20 09:56:07.441: E/AndroidRuntime(809): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
04-20 09:56:07.441: E/AndroidRuntime(809): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
04-20 09:56:07.441: E/AndroidRuntime(809): at dalvik.system.NativeStart.main(Native Method) 
04-20 09:56:07.441: E/AndroidRuntime(809): Caused by: java.lang.reflect.InvocationTargetException 
04-20 09:56:07.441: E/AndroidRuntime(809): at java.lang.reflect.Method.invokeNative(Native Method) 
04-20 09:56:07.441: E/AndroidRuntime(809): at java.lang.reflect.Method.invoke(Method.java:511) 
04-20 09:56:07.441: E/AndroidRuntime(809): at android.view.View$1.onClick(View.java:3586) 
04-20 09:56:07.441: E/AndroidRuntime(809): ... 11 more 
04-20 09:56:07.441: E/AndroidRuntime(809): Caused by: java.lang.NullPointerException: file 
04-20 09:56:07.441: E/AndroidRuntime(809): at android.net.Uri.fromFile(Uri.java:441) 
04-20 09:56:07.441: E/AndroidRuntime(809): at com.mycompany.myapp.utils.FileUtils.getOutputMediaFileUri(FileUtils.java:19) 
04-20 09:56:07.441: E/AndroidRuntime(809): at com.mycompany.myapp.MyActivity.dispatchCameraIntent(MyActivity.java:56) 
04-20 09:56:07.441: E/AndroidRuntime(809): ... 14 more 
04-20 09:56:10.860: I/Process(809): Sending signal. PID: 809 SIG: 9

来源

2013-04-20 learner

getExternalStoragePublicDirectory仅在API 8中可用。是否在具有较低版本操作系统的设备上测试您的应用程序？ – Blackbelt 2013-04-20 19:02:45

你有没有加入http://developer.android.com/reference/android/Manifest.permission.html#READ_EXTERNAL_STORAGE和http://developer.android.com/reference/android/Manifest.permission.html#WRITE_EXTERNAL_STORAGE到您的清单？

来源

2013-04-20 17:35:34 evertvandenbruel

如果您添加写权限，您将拥有默认阅读权限http://developer.android.com/reference/android/Manifest.permission.html#READ_EXTERNAL_STORAGE – Raghunandan 2013-04-20 18:37:19

嘿，伙计，它的工作原理。但我得告诉你，这一切都很有趣。该应用程序用于正常工作。然后我的模拟器不会加载应用程序，因为内存不足。所以我编辑了模拟器来添加更多的内存然后重新启动。从那以后，我开始发现错误。 – learner 2013-04-20 20:44:24

mediaStorageDir.mkdirs（）不创建目录

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