Android Improve UI Performance

Improving Layout Performance

I) Loading Views on Demand

Use ViewStub

https://github.com/PhanVanLinh/AndroidViewStub

II) Optimizing Layout Hierarchies

Use Hierarchy Viewer for dump your layout

Some basic idea

• Example we have layout which have 3 TextViews (1 TextView at Center-Left, 1 TextView at Top-Right, 1 at Bottom-Right). We can achieve it by using 1 RelativeLayout, or use 2 nested LinearLayout. In this case RelativeLayout is better for performance
• Prevent use layout:weight property because when we use layout:weight, layout need to redraw after it draw

II) Reduce Overdraw

By default, Android will set a default background for any layout (example default background for theme light is #FAFAFA).
Then when we want to change the background of layout to another color (example #FFFFFFF), the overdraw will increase. To prevent it we can use windowBackground

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar"> 
    ... 
    <item name="android:windowBackground">@null</item> 
</style>