android通过系统调用图片文件的Uri转换为绝对文件路径

public 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;

}