How to put a Button at the bottom of the screen - Android Development
the whole gravity / layout_gravity is a bit confusing, so here is a snippet:
<LinearLayout android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:gravity="center_horizontal|bottom">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" Back "
android:id="@+id/btn_back"/>
</LinearLayout>
The line of code that makes the button at the bottom is android:gravity="center_horizontal|bottom".