How can I draw this graph in Android using XML?

If you use RelativeLayout, you can make a black rectangle and put a white triangle image on top. I can't see how it could be a triangle without an image.

Well, I must have been a little brain dead yesterday. This is a better solution.

layout:

  <RelativeLayout android:layout_width="300dp"
                  android:layout_height="100dp"
                  android:layout_centerVertical="true"
                  android:layout_centerHorizontal="true"
                  android:background="@android:color/black">

       <View android:layout_width="100dp"
             android:layout_alignParentRight="true"
             android:layout_height="match_parent"
             android:background="@drawable/background_triangle_right"/>

  </RelativeLayout>

Drawable that draws triangles:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">



<item>
    <rotate
            android:fromDegrees="45"
            android:toDegrees="45"
            android:pivotX="87%"
            android:pivotY="140%">
        <shape
                android:shape="rectangle">
            <stroke android:color="@android:color/white" android:width="10dp"/>
            <solid
                    android:color="@android:color/white"/>
        </shape>
    </rotate>
</item>

</layer-list>