public int[] getGradientColors(int startColor, int endColor, int size) {
        int colors[] = new int[size];

        int startR = Color.red(startColor);
        int startG = Color.green(startColor);
        int startB = Color.blue(startColor);

        int endR = Color.red(endColor);
        int endG = Color.green(endColor);
        int endB = Color.blue(endColor);

        ValueInterpolator interpolatorR = new ValueInterpolator(0, size - 1, endR, startR);
        ValueInterpolator interpolatorG = new ValueInterpolator(0, size - 1, endG, startG);
        ValueInterpolator interpolatorB = new ValueInterpolator(0, size - 1, endB, startB);

        for (int i = 0; i < size; ++i) {
            colors[i] = Color.argb(255, (int) interpolatorR.map(i), (int) interpolatorG.map(i), (int) interpolatorB.map(i));
        }
        return colors;
    }

Copyright 2018 Krunal Kapadiya

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.