通过 MediaStore.Images.Media 如何获取路径？

我使用下面的代码获取 sd card 相片的 bitmap。

String[] projection = {MediaStore.Images.Media._ID,MediaStore.Images.Media.DATA};  
Cursor cursor = managedQuery( MediaStore.Images.Media.EXTERNAL_CONTENT_URI, projection, null, null, MediaStore.Images.Media._ID); 
int count = cursor.getCount();
int image_column_index = cursor.getColumnIndex(MediaStore.Images.Media._ID);
path = new String[count];
bm = new Bitmap[count];
for (int i = 0; i < count; i++) {
cursor.moveToPosition(i);
int id = cursor.getInt(image_column_index);
path[i] //How to get path
bt[i] = MediaStore.Images.Thumbnails.getThumbnail(getApplicationContext().getContentResolver(), id, MediaStore.Images.Thumbnails.MICRO_KIND, null);
}

我已经获得所有照片的 thumbnail。但是我想想获取绝对路径。要改哪些代码?