Color Picker Dialog (AmbilWarna) in Android

dependencies {
    implementation 'com.github.yukuku:ambilwarna:2.0.1'
}

dependencies {
    compile 'com.github.yukuku:ambilwarna:2.0.1'
}

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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:id="@+id/layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.application.colorpicker.MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="open color picker"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

package com.example.application.colorpicker;

import android.support.constraint.ConstraintLayout;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import yuku.ambilwarna.AmbilWarnaDialog;

public class MainActivity extends AppCompatActivity {
    ConstraintLayout mLayout;
    int mDefaultColor;
    Button mButton;

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

        mLayout = (ConstraintLayout) findViewById(R.id.layout);
        mDefaultColor = ContextCompat.getColor(MainActivity.this, R.color.colorPrimary);
        mButton = (Button) findViewById(R.id.button);
        mButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                openColorPicker();
            }
        });
    }

    public void openColorPicker() {
        AmbilWarnaDialog colorPicker = new AmbilWarnaDialog(this, mDefaultColor, new AmbilWarnaDialog.OnAmbilWarnaListener() {
            @Override
            public void onCancel(AmbilWarnaDialog dialog) {

            }

            @Override
            public void onOk(AmbilWarnaDialog dialog, int color) {
                mDefaultColor = color;
                mLayout.setBackgroundColor(mDefaultColor);
            }
        });
        colorPicker.show();
    }
}