Write the below code in string.xml file.
<style name="ButtonText">
<item name="android:layout_width">match_parent</item>
<item name="android:layout_height">wrap_content</item>
<item name="android:textColor">#ffffff</item>
<item name="android:gravity">center</item>
<item name="android:layout_margin">3dp</item>
<item name="android:textSize">30sp</item>
<item name="android:textStyle">bold</item>
<item name="android:shadowColor">#000000</item>
<item name="android:shadowDx">1</item>
<item name="android:shadowDy">1</item>
<item name="android:shadowRadius">2</item>
</style>
Make a file named btn_black.xml in drawable folder.
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" >
<shape>
<solid
android:color="#343434" />
<stroke
android:width="1dp"
android:color="#171717" />
<corners
android:radius="3dp" />
<padding
android:left="10dp"
android:top="10dp"
android:right="10dp"
android:bottom="10dp" />
</shape>
</item>
<item>
<shape>
<gradient
android:startColor="#343434"
android:endColor="#171717"
android:angle="270" />
<stroke
android:width="1dp"
android:color="#171717" />
<corners
android:radius="4dp" />
<padding
android:left="10dp"
android:top="10dp"
android:right="10dp"
android:bottom="10dp" />
</shape>
</item>
</selector>
in main.xml
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="@style/ButtonText"
android:background="@drawable/btn_black"
android:text="@string/add" />
Output:
