uri在android的路徑問題

Question

我想解析uri從存儲訪問框架打開的文件。

我怎樣才能獲得的路徑和使用檔案庫中打開它..

protected void onActivityResult(int requestCode, int resultCode, Intent data){ 
    super.onActivityResult(requestCode, resultCode, data); 
    if (requestCode == OPEN_REQUEST_CODE && resultCode == Activity.RESULT_OK) { 

     if (data != null) { 
      uri = data.getData(); 
      EditText FileLocation = (EditText) findViewById(R.id.FileUrl); 
      File file=new File(uri.getPath()); 

      if(file.exists()){ 

      }else{ 

      } 

     } 
    } 

IM無法訪問該文件..

Answer 1

下面的代碼用於獲取路徑和文件名

private static final int FILE_SELECT_CODE = 0; 

    String mediaPath; 

    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     switch (requestCode) { 
      case FILE_SELECT_CODE: 
       if (resultCode == RESULT_OK) { 
        // Get the Uri of the selected file 
        Uri uri = data.getData(); 
        Log.d("=========>>>>>", "File Uri: " + uri.toString()); 
        // Get the path 
        try { 
         mediaPath = getPath(this, uri); 

         Log.d("==============>>>>mpp","test"+mediaPath); 
         //createByteArray(path); 
         getFileName(uri); 

        } catch (URISyntaxException e) { 
         e.printStackTrace(); 
        } 
        // Get the file instance 
        // File file = new File(path); 
        // Initiate the upload 
       } 
       break; 
     } 
     super.onActivityResult(requestCode, resultCode, data); 
    } 



public String getFileName(Uri uri) { 
     String result = null; 
     if (uri.getScheme().equals("content")) { 
      Cursor cursor = getContentResolver().query(uri, null, null, null, null); 
      try { 
       if (cursor != null && cursor.moveToFirst()) { 
        result = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME)); 
       } 
      } finally { 
       cursor.close(); 
      } 
     } 
     if (result == null) { 
      result = uri.getPath(); 
      int cut = result.lastIndexOf('/'); 
      if (cut != -1) { 
       result = result.substring(cut + 1); 
      } 
     } 
     return result; 
    } 

    @RequiresApi(api = Build.VERSION_CODES.KITKAT) 
    public static String getPath(final Context context, final Uri uri) throws URISyntaxException { 

     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 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; 
    } 

    /** 
    * 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. 
    */ 
    public 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 index = cursor.getColumnIndexOrThrow(column); 
       return cursor.getString(index); 
      } 
     } finally { 
      if (cursor != null) 
       cursor.close(); 
     } 
     return null; 
    } 


    /** 
    * @param uri The Uri to check. 
    * @return Whether the Uri authority is ExternalStorageProvider. 
    */ 
    public 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. 
    */ 
    public 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. 
    */ 
    public static boolean isMediaDocument(Uri uri) { 
     return "com.android.providers.media.documents".equals(uri.getAuthority()); 
    } 

    /** 
    * @param uri The Uri to check. 
    * @return Whether the Uri authority is Google Photos. 
    */ 
    public static boolean isGooglePhotosUri(Uri uri) { 
     return "com.google.android.apps.photos.content".equals(uri.getAuthority()); 
    }