How to use the Palette.

README.md

Introduction

We can extract the colors from the bitmap.

Start

Add the library in your app gradle.

compile 'com.android.support:palette-v7:25.1.0'

We have four ways to create the palette.

// Now Palette.from(bitmap) is the same as Palette.Builder(bitmap).

// Synchronous methods.
// --------------------------------
// These should be used when you have access to the underlying image loading thread.
// Picasso allows this through a Transformation. For other libraries, YMMV.
// Uses the default palette size (16).
Palette p = Palette.from(bitmap).generate();
// Allows you to specify the maximum palette size, in this case 24.
Palette p = Palette.from(bitmap).maximumColorCount(24).generate();

// Asynchronous methods
// --------------------------------
// This is the quick and easy integration path. Internally uses an AsyncTask so
// this may not be optimal (since you're dipping in and out of threads)
// Uses the default palette size (16).
Palette.from(bitmap).generate(new Palette.PaletteAsyncListener() {
    @Override
    public void onGenerated(Palette palette) {
       // Here's your generated palette
    }
});
// Allows you to specify the maximum palette size, in this case 24.
Palette.from(bitmap).maximumColorCount(24).generate(new Palette.PaletteAsyncListener() {
    @Override
    public void onGenerated(Palette palette) {
       // Here's your generated palette
    }
});

Six swatchs

We often use Vibrant and Dark Vibrant.

// Vibrant.
Palette.getVibrantSwatch()
// Vibrant dark.
Palette.getDarkVibrantSwatch()
// Vibrant light.
Palette.getLightVibrantSwatch()
// Muted.
Palette.getMutedSwatch()
// Muted dark.
Palette.getDarkMutedSwatch()
// Muted light.
Palette.getLightMutedSwatch()

adjustAlpha.java

// Call it to set the transparency to, let's say, 50%:
int halfTransparentColor = adjustAlpha(0xFFFFFFFF, 0.5f);

// After you got a color from palette, you can change color as like this way.
public int adjustAlpha(int color, float factor) {
    int alpha = Math.round(Color.alpha(color) * factor);
    int red = Color.red(color);
    int green = Color.green(color);
    int blue = Color.blue(color);
    
    return Color.argb(alpha, red, green, blue);
}