Here you can find the source of createRGBColorFilter(int red, int green, int blue, float alpha)
public static ColorMatrixColorFilter createRGBColorFilter(int red, int green, int blue, float alpha)
//package com.java2s; import android.graphics.ColorMatrixColorFilter; public class Main { public static ColorMatrixColorFilter createRGBColorFilter(int red, int green, int blue) { final float[] array = new float[] { 0, 0, 0, 0, red, 0, 0, 0, 0, green, 0, 0, 0, 0, blue, 0, 0, 0, 1, 0 }; return new ColorMatrixColorFilter(array); }/* w w w .j a v a2 s . c o m*/ public static ColorMatrixColorFilter createRGBColorFilter(int red, int green, int blue, float alpha) { final float[] array = new float[] { 0, 0, 0, 0, red, 0, 0, 0, 0, green, 0, 0, 0, 0, blue, 0, 0, 0, alpha, 0 }; return new ColorMatrixColorFilter(array); } }