LinearLayout or RelativeLayout's width/height with specified ratio,for example:
<com.github.tcking.view.RatioRelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:ratio="4:3"
>
...
</com.github.tcking.view.RatioRelativeLayout>the ratio default base on width,we also can specified ratio base on height via:app:ratioBase="height"
need more RatioLayout? if u using android studio that is simple,just open RatioLinearLayout type F5 change target class name,and then change target class super class what you want