I have a LinearLayout in horizontal orientation and 2 ImageView and I want to make that ImagesView fill 50% of the screen on width, to work in every cellphone or tablet with
Add android:layout_weight="1" in both the ImageView and make the width if image view as fill_parent I think it will solve your problem
android:layout_weight="1"
ImageView
fill_parent
But remember it will stretch your image as because image view will streach in every screen resolution so as your image.