图片uri转为路径

String res = null;
String scheme = uri.getScheme();
if(scheme.equals(ContentResolver.SCHEME_FILE)){
res = uri.getPath();
}else{
String[] proj = { MediaStore.Images.Media.DATA };
Cursor cursor = context.getContentResolver().query(uri, proj, null, null, null);
if(cursor != null){
if (cursor.moveToFirst()) {
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
res = cursor.getString(column_index);
}
cursor.close();
}
}