Using "Palette"

Palette.java

final int bgColor = getResources().getColor(R.color.colorPrimary);

ImageLoader.getInstance().displayImage(user.getImageUrl(), header, new SimpleImageLoadingListener() {
    @Override
    public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
        if (VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {

            Palette.from(loadedImage).generate(new PaletteAsyncListener() {
                @SuppressLint("NewApi")
                @Override
                public void onGenerated(Palette palette) {
                    Swatch vibrant = palette.getVibrantSwatch();
                    if (vibrant == null) {
                        vibrant = palette.getDarkVibrantSwatch();
                    }
                    if (vibrant == null) return;

                    Window window = getWindow();
                    window.addFlags(LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
                    window.setStatusBarColor(vibrant.getRgb());
                    toolbar.setBackgroundColor(palette.getMutedColor(bgColor));
                }
            });
        }
    }
});