How to fix Slow Rendering (Android vitals)

Question

I have an app that is listed as in the bottom 25% in the new Google Play Console - Android vitals section for Slow Rendering. I am concerned of this because of such articles

Answer 1

I checked your code. Not sure if this is the actual code or if you have more to this. In any case I will draw attention to some of the Rendering issues in android.

1. OverDraw

Overdraw is where you waste GPU processing time by coloring in pixels that only get colored in again by something else. These can be common if you have added a background to your parent container layout and then the children are also added a background or if you have added a common background on you styles file for the application theme and then added backgrounds to the rest of the xml layout files you have created.

The causes for the overdraw can be anything, try checking your code for this. There is a developer tool installed in all mobile devices to check Overdraw in developer options. Here is the official documentation for overdraw.

2. View hierarchy

To render each view, Android goes through three stages:

1.measure

2.layout

3.draw

The time it takes Android to complete these stages is proportional to the number of views in your hierarchy. I see in your layout file that you have constraint layout which includes a linear layout. I don't see the use of this. Constraint layout was introduced to help developers reduce view hierarchy. Reduce the number of childs a particular layout can have. There is also a tool to help you with this. Here is the official android guide to it. Try these steps to figure out the GPU rendering issues.