Android : Place items from right to left in gridLayout

I am developing an app with persian version. I have a GridLayout in one of my layouts. I want to place items from right to left in that layout, Which means I want to have cell(1,1) in top right of my layout. I have tested:

1-

android:gravity="right"  

and

android:layout_gravity="right"

but it doesn't work.

2- I also tested

android:layoutDirection="rtl"

and it doesn't work too. how can I place items from right to left?