Uri的相互转换

文件File path(file:///)与content:// Uri的相互转换

1.content Uri to path

/**  * Gets the corresponding path to a file from the given content:// URI  * @param selectedVideoUri The content:// URI to find the file path from  * @param contentResolver The content resolver to use to perform the query.  * @return the file path as a string  */  public static String getFilePathFromContentUri(Uri selectedVideoUri,ContentResolver     contentResolver) {      String filePath;      String[] filePathColumn = {MediaColumns.DATA};      Cursor cursor = contentResolver.query(selectedVideoUri, filePathColumn, null,null,null);    //      也可用下面的方法拿到cursor  //      Cursor cursor = this.context.managedQuery(selectedVideoUri, filePathColumn, null, null, null);      cursor.moveToFirst();      int columnIndex = cursor.getColumnIndex(filePathColumn[0]);      filePath = cursor.getString(columnIndex);      cursor.close();      return filePath;  }  

2.path to content Uri

/**  * Gets the content:// URI  from the given corresponding path to a file  * @param context  * @param imageFile  * @return content Uri  */  public static Uri getImageContentUri(Context context, java.io.File imageFile) {         String filePath = imageFile.getAbsolutePath();         Cursor cursor = context.getContentResolver().query(                 MediaStore.Images.Media.EXTERNAL_CONTENT_URI,                 new String[] { MediaStore.Images.Media._ID },                 MediaStore.Images.Media.DATA + "=? ",                 new String[] { filePath }, null);         if (cursor != null && cursor.moveToFirst()) {             int id = cursor.getInt(cursor                     .getColumnIndex(MediaStore.MediaColumns._ID));             Uri baseUri = Uri.parse("content://media/external/images/media");             return Uri.withAppendedPath(baseUri, "" + id);         } else {             if (imageFile.exists()) {                 ContentValues values = new ContentValues();                 values.put(MediaStore.Images.Media.DATA, filePath);                 return context.getContentResolver().insert(                         MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);             } else {                 return null;             }         }     }