How to create a cutom rectangle shape in android

I want to create an edit text of rectangle shape with one side is curved to inside, like what I have shown in the figure

enter image description here

I have tried this, but it curves just the corners.

  <?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="@color/mep_blue"></solid>

    <!--<stroke android:color="f00"-->
    <!--android:width="0"></stroke>-->
    <stroke android:color="#a49b9b"
        android:width="0.10dp"/>
    <corners
        android:topLeftRadius="-100dp"
        android:topRightRadius="-100dp"
        android:bottomLeftRadius="100dp"
        android:bottomRightRadius="100dp"
        /> </shape