Path: android/app/src/main/res/drawable/launch_background.xml
Change this:
<item android:drawable="@android:color/white" />
To:
<item android:drawable="@drawable/gradient_background" />
Path: android/app/src/main/res/values/colors.xml
Content:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="gradientstart">#000000</color>
<color name="gradientend">#FFFFFF</color>
</resources>
Change #000000 and #FFFFFF to your favorite colors
Path: android/app/src/main/res/drawable/gradient_background.xml
Content:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient
android:startColor="@color/gradientstart"
android:endColor="@color/gradientend"
android:angle="90"/>
</shape>
Change angle="90" to your preferred angle
Note: this may not work in flutter project