you can try using this tool for obtaining colors you want, http://angrytools.com/gradient/
and then arrange in horizontal, one of the ideas can be, creating three drawables and arrange them using linear layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<ImageView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/image1"/>
<ImageView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/image2"/>
<ImageView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/image3"/>
</LinearLayout>