Do it this way
your button in xml layout
<Button
android:id="@+id/btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="TUTORIAL"
android:padding="5dp"
android:textColor="@android:color/white"
android:background="@drawable/button_selector" />
Create a selector xml inside drawable folder button_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:drawable="@drawable/button_background_one"
android:state_pressed="true" />
<item android:drawable="@drawable/button_backgroun_two" />
</selector>
button_background_one.xml inside drawable folder
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape>
<solid
android:color="#959595" />
<stroke
android:width="0dp"
android:color="#959595" />
<corners
android:radius="0dp" />
<padding
android:left="3dp"
android:top="3dp"
android:right="0dp"
android:bottom="0dp" />
</shape>
</item>
<item>
<shape>
<solid android:color="#c2c2c2"/>
<stroke
android:width="0dp"
android:color="#c2c2c2" />
<corners
android:radius="0dp" />
<padding
android:left="3dp"
android:top="3dp"
android:right="0dp"
android:bottom="0dp" />
</shape>
</item>
</layer-list>
button_backgroun_two.xml in drawable folder
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape>
<solid
android:color="#959595" />
<stroke
android:width="0dp"
android:color="#959595" />
<corners
android:radius="0dp" />
<padding
android:left="0dp"
android:top="0dp"
android:right="3dp"
android:bottom="3dp" />
</shape>
</item>
<item>
<shape>
<solid android:color="#c2c2c2"/>
<stroke
android:width="0dp"
android:color="#c2c2c2" />
<corners
android:radius="0dp" />
<padding
android:left="0dp"
android:top="0dp"
android:right="3dp"
android:bottom="3dp" />
</shape>
</item>
</layer-list>
This should work.Try it