获取点击文件后onActivityResult中文件路径错误

Question

if (data.getData() != null) {
            if (data.getData().getScheme().equals("content")) {
                String s = data.getData().getPath();  //文件路径
                Uri uri = data.getData();  // uri
                File file = new File(s);  //可打开的文件路径

                Z.log("path: "+s);
                Z.log("uri: "+uri);
                Z.log("file: "+file);


                Z.show("获取了返回值");
                Z.log(file.exists()+"");
                if (file.exists()) {  //判断文件是否存在
                    Log.e("file", "f是文件且存在");
                    Conversation conversation = getCurrentConversation();
                    sendFile(conversation.getConversationType(), conversation.getTargetId(), file, uri);
                } else {
                    Z.log("文件不存在");
                }
            }else {
                Z.show("如果文件类型不同");
            }
            
            没毛病吧?结果是打印的path是 /document/image:4935  ,为啥是这样啊,但奇怪的事来了:我使用下载的第三方re管理器打开选择文件,却可以正常打印/storage/emulated/0/Download/1452843394654564.jpg,,,,,什么情况?
            

Answer 1

并不是错误，而是你拿到的还只是文件的scheme路径，是uri地址，还不是真正的file路径，需要把uri转换成file，比如你现在取的是图片文件，可以这么转换

public String getRealPathFromURI(Uri uri) {
    String res = null;
    String[] proj = { MediaStore.Images.Media.DATA };
    Cursor cursor = getContentResolver().query(uri, proj, null, null, null);
    if(cursor.moveToFirst()){;
       int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
       res = cursor.getString(column_index);
    }
    cursor.close();
    return res;
}

Answer 2

使用这句了..虽然有点长

  /**

• android 4.4以上和以下版本使用自带文件管理器打开本地文件路径不同,的解决方法
  *

• @param context

• @param uri

• @return
  */

         @TargetApi(Build.VERSION_CODES.KITKAT)  //版本

1. 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];
                      }
      
                      // TODO handle non-primary volumes
                  }
                  // 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 getDataColumn(context, uri, null, null);
              }
              // File
              else if ("file".equalsIgnoreCase(uri.getScheme())) {
                  return uri.getPath();
              }
      
              return null;
          }
      
          /**

   • Get the value of the data column for this Uri. This is useful for

   • MediaStore Uris, and other file-based ContentProviders.
     *

   • @param context The context.

   • @param uri The Uri to query.

   • @param selection (Optional) Filter used in the query.

   • @param selectionArgs (Optional) Selection arguments used in the query.

   • @return The value of the _data column, which is typically a file path.
     */

2. static String getDataColumn(Context context, Uri uri, String selection,

                                             String[] selectionArgs) {
      
              Cursor cursor = null;
              final String column = "_data";
              final String[] projection = {
                      column
              };
      
              try {
                  cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
                          null);
                  if (cursor != null && cursor.moveToFirst()) {
                      final int column_index = cursor.getColumnIndexOrThrow(column);
                      return cursor.getString(column_index);
                  }
              } finally {
                  if (cursor != null)
                      cursor.close();
              }
              return null;
          }
      
          /**

   • @param uri The Uri to check.

   • @return Whether the Uri authority is ExternalStorageProvider.
     */

3. static boolean isExternalStorageDocument(Uri uri) {

              return "com.android.externalstorage.documents".equals(uri.getAuthority());
          }
      
          /**

   • @param uri The Uri to check.

   • @return Whether the Uri authority is DownloadsProvider.
     */

4. static boolean isDownloadsDocument(Uri uri) {

              return "com.android.providers.downloads.documents".equals(uri.getAuthority());
          }
      
          /**

   • @param uri The Uri to check.

   • @return Whether the Uri authority is MediaProvider.
     */

5. static boolean isMediaDocument(Uri uri) {

              return "com.android.providers.media.documents".equals(uri.getAuthority());
          }

Answer 3

其实就一句话，不同手机拿到路径不同，需要将拿到的路径转换成绝对路径