文件File path与content:// Uri的相互转换

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;}

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;            }        }    }

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