MainActivity.java

package com.myapplicationpalettetest;

import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.graphics.Palette;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {

    private ImageView mainImage;
    private Button vibrant;
    private Button vibrantDark;
    private Button vibrantLight;
    private Button muted;
    private Button mutedDark;
    private Button mutedLight;

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

        //let's initialize the ImageView and get the Bitmap from the Image to use further
        mainImage = findViewById(R.id.image);

        //now initialize all Buttons
        vibrant = findViewById(R.id.btnVibrant);
        vibrantDark = findViewById(R.id.btnVibrantDark);
        vibrantLight = findViewById(R.id.btnVibrantLight);
        muted = findViewById(R.id.btnMuted);
        mutedDark = findViewById(R.id.btnMutedDark);
        mutedLight = findViewById(R.id.btnMutedLight);

        //let's get the Drawable from the Image
        //we will get the Bitmap Drawable, from which we can easily get the Bitmap
        BitmapDrawable mBitmapDrawable = (BitmapDrawable) mainImage.getDrawable();

        //Now get the Bitmap to use further
        Bitmap mBitmap = mBitmapDrawable.getBitmap();

        //Syncronous way
        Palette palette = Palette.from(mBitmap).generate();

        //Asyncronous way to generate the Palette
        Palette.from(mBitmap).generate(new Palette.PaletteAsyncListener() {
            @Override
            public void onGenerated(@Nullable Palette palette) {
                //Now we can use the Palette object
                //first get each color swatch and
                Palette.Swatch vibrantSwatch = palette.getVibrantSwatch();
                Palette.Swatch darkVibrantSwatch = palette.getDarkVibrantSwatch();
                Palette.Swatch lightVibrantSwatch = palette.getLightVibrantSwatch();
                Palette.Swatch mutedSwatch = palette.getMutedSwatch();
                Palette.Swatch mutedDarkSwatch = palette.getDarkMutedSwatch();
                Palette.Swatch mutedLightSwatch = palette.getLightMutedSwatch();

                //now pass each swatch to the method to set the bg and text color to each Button
                setButtonSwatch(vibrant, vibrantSwatch);
                setButtonSwatch(vibrantDark, darkVibrantSwatch);
                setButtonSwatch(vibrantLight, lightVibrantSwatch);
                setButtonSwatch(muted, mutedSwatch);
                setButtonSwatch(mutedDark, mutedDarkSwatch);
                setButtonSwatch(mutedLight, mutedLightSwatch);
            }
        });


    }

    //create a method with the parameters as TextView and Swatches
    private void setButtonSwatch(Button button, Palette.Swatch swatch) {
        if (swatch != null) {
            // Set the background color of a layout based on the vibrant color
            button.setBackgroundColor(swatch.getRgb());
            button.setTextColor(swatch.getTitleTextColor());
        }
    }
}