GMAndroid/app/src/main/res/drawable/dialog_schedule.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
	android:shape="rectangle">
	<gradient
		android:angle="90"
		android:centerY="10%"
		android:centerX="0.1"
		android:startColor="@color/background_app_gradient"
		android:endColor="@color/background_app"
		android:type="linear" />
	<stroke 
		android:width="2px"
		android:color="@color/black" />
</shape>