you can easily use sweep type to make that.

<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient android:startColor="@color/green" android:endColor="@color/BackgroundColor"
        android:angle="90"
        android:centerX="-5"
        android:centerY="0.5"
        android:type="sweep"
        />
</shape>

enter image description here