android 6.0 NullPointerException獲取照片路徑

我使用下面的代碼來獲取照片路徑，在使用照相機拍照後保存圖像，並且只在Nexus 5上的Android 6.0上發生NullPointerException。在升級到Android 6.0在相同的手機上運行良好。android 6.0 NullPointerException獲取照片路徑

final Uri selectedImageUri = data == null ? null : data.getData(); 
String selectedImagePath = null; 
selectedImagePath = getPath(getActivity(), selectedImageUri); 


@TargetApi(19) 
public static String getPath(final Context context, final Uri uri) { 

    final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT; 

    // DocumentProvider 
    if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) { 
     // ExternalStorageProvider 
     if (isExternalStorageDocument(uri)) { 
      final String docId = DocumentsContract.getDocumentId(uri); 
      final String[] split = docId.split(":"); 
      final String type = split[0]; 

      if ("primary".equalsIgnoreCase(type)) { 
       return Environment.getExternalStorageDirectory() + "/" + split[1]; 
      } 
     } 
     // DownloadsProvider 
     else if (isDownloadsDocument(uri)) { 

      final String id = DocumentsContract.getDocumentId(uri); 
      final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id)); 

      return getDataColumn(context, contentUri, null, null); 
     } 
     // MediaProvider 
     else if (isMediaDocument(uri)) { 
      final String docId = DocumentsContract.getDocumentId(uri); 
      final String[] split = docId.split(":"); 
      final String type = split[0]; 

      Uri contentUri = null; 
      if ("image".equals(type)) { 
       contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; 
      } else if ("video".equals(type)) { 
       contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI; 
      } else if ("audio".equals(type)) { 
       contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; 
      } 

      final String selection = "_id=?"; 
      final String[] selectionArgs = new String[] { 
        split[1] 
      }; 

      return getDataColumn(context, contentUri, selection, selectionArgs); 
     } 
    } 
    // MediaStore (and general) 
    else if ("content".equalsIgnoreCase(uri.getScheme())) { 

     // Return the remote address 
     if (isGooglePhotosUri(uri)) 
      return uri.getLastPathSegment(); 

     return getDataColumn(context, uri, null, null); 
    } 
    // File 
    else if ("file".equalsIgnoreCase(uri.getScheme())) { 
     return uri.getPath(); 
    } 

    return null; 
}

它拋出內部 DocumentsContract.isDocumentUri(context, uri)

UPDATE

一個NullPointerException我發現，問題出在URI被空。這裏的代碼來檢索URI

@Override 
    public void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if (requestCode == REQUEST_TAKE_PHOTO){ 
     if(resultCode == Activity.RESULT_OK) { 

      final boolean isCamera; 
      if(data == null) 
      { 
       isCamera = true; 
      } 
      else 
      { 
       final String action = data.getAction(); 
       if(action == null) 
       { 
        isCamera = false; 
       } 
       else 
       { 
        isCamera = action.equals(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
       } 
      } 

      String createdImagePath = null; 
      if(isCamera) 
      { 
       createdImagePath = mCallbacks.getCurrentPhotoPath(); 
      } 
      else 
      { 
       final Uri selectedImageUri = data == null ? null : data.getData(); 
       String selectedImagePath = null; 

       selectedImagePath = getPath(getActivity(), selectedImageUri);

來源

2015-10-16 Nameless

不......它在#isDocumentUri方法內的某個地方拋出NullPointerException異常。附上至少部分日誌輸出...是不可能的上下文或uri爲空？ – VizGhar

@VizGhar這似乎是最明智的，但如果是這樣，這是糟糕的API設計，它會更好，如果'DocumentsContract.isDocumentUri'檢查爲空參數並拋出IllegalArgumentException – NickJ

如果它是在函數內部的問題，那麼它是在' DocumentContract.isDocumentUri - > uri.getPathSegments（）;或'DocumentContract.isDocumentsProvider - > context.getPackageManager（）' – VizGhar

也許我找到了解決方案。我要在這裏添加另一個空檢查：

   if(data == null || data.getData() == null)

它看起來像在Android 6.0回吐相機拍照後返回的意圖不爲空就像在以前的操作系統版本，但它不包含任何數據。因此，檢查數據是否像我一樣到目前爲止是空的是不夠的。

來源

2015-10-16 10:12:12 Nameless

android 6.0 NullPointerException獲取照片路徑

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