backbtn.xml





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


    <item android:state_pressed="true">
        <ripple android:color="@color/white"
            tools:targetApi='lollipop'>
            <item android:id="@+id/mask">
                <shape android:shape="rectangle">
                    <solid android:color="@color/white" />
                    <corners android:radius="30dp"/>

                </shape>
            </item>

        </ripple>

    </item>


    <item android:state_enabled="true">

    <shape android:shape="rectangle">
        <solid android:color="@color/black" />
        <corners android:radius="30dp"/>

    </shape>


    </item>

</selector>


gradient_back.xml







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

    <gradient android:angle="45"
        android:endColor="@color/white"
        android:startColor="@color/black"

        />



</shape>