Create a Custom Button using XML ShapeDrawables

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/custom_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Press me" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:text="Press me too" />

    <Switch
        android:id="@+id/switch_enable_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:checked="true"
        android:text="Enabled" />

</LinearLayout>

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

    <gradient
        android:angle="90"
        android:endColor="#6ca752"
        android:startColor="#9dcf87" />

    <padding
        android:bottom="7dp"
        android:left="7dp"
        android:right="7dp"
        android:top="7dp" />

    <stroke
        android:width="2dp"
        android:color="#FFF" />
    <!--android:dashGap="1dp"
    android:dashWidth="4dp"-->

    <corners android:radius="15dp" />

</shape>

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

    <solid android:color="#b6b7b5" />

    <padding
        android:bottom="7dp"
        android:left="7dp"
        android:right="7dp"
        android:top="7dp" />

    <stroke
        android:width="2dp"
        android:color="#FFF" />
    <!--android:dashGap="1dp"
    android:dashWidth="4dp"-->

    <corners android:radius="15dp" />

</shape>

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

    <gradient
        android:angle="90"
        android:endColor="#86c66a"
        android:startColor="#b0de9d" />

    <padding
        android:bottom="7dp"
        android:left="7dp"
        android:right="7dp"
        android:top="7dp" />

    <stroke
        android:width="2dp"
        android:color="#FFF" />
    <!--android:dashGap="1dp"
    android:dashWidth="4dp"-->

    <corners android:radius="15dp" />

</shape>

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:state_pressed="true"
        android:drawable="@drawable/button_pressed" />
    <item
        android:state_enabled="false"
        android:drawable="@drawable/button_disabled" />
    <item
        android:drawable="@drawable/button_default" />
</selector>

package tech.codingpoint.custombuttonexample;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.Switch;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final Button customButton = findViewById(R.id.custom_button);
        Switch switchEnableButton = findViewById(R.id.switch_enable_button);

        customButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this, "Click", Toast.LENGTH_SHORT).show();
            }
        });

        switchEnableButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (isChecked) {
                    customButton.setEnabled(true);
                } else {
                    customButton.setEnabled(false);
                }
            }
        });
    }
}

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
        <item name="buttonStyle">@style/CustomButton</item>
    </style>

    <style name="CustomButton" parent="Widget.AppCompat.Button">
        <item name="android:background">@drawable/custom_button</item>
        <item name="android:textColor">#FFF</item>
        <item name="android:stateListAnimator">@null</item>
    </style>

</resources>