android图片文件的路径地址与Uri的相互转换

/**

 * Try to return the absolute file path from the given Uri

 *

 * @param context

 * @param uri

 * @return the file path or null

 */

public static String getRealFilePath( final Context context, final Uri uri ) {

    if ( null == uri ) return null;

    final String scheme = uri.getScheme();

    String data = null;

    if ( scheme == null )

        data = uri.getPath();

    else if ( ContentResolver.SCHEME_FILE.equals( scheme ) ) {

        data = uri.getPath();

    } else if ( ContentResolver.SCHEME_CONTENT.equals( scheme ) ) {

        Cursor cursor = context.getContentResolver().query( uri, new String[] { ImageColumns.DATA }, null, null, null );

        if ( null != cursor ) {

            if ( cursor.moveToFirst() ) {

                int index = cursor.getColumnIndex( ImageColumns.DATA );

                if ( index > -1 ) {

                    data = cursor.getString( index );

                }

            }

            cursor.close();

        }

    }

    return data;

}