Java tutorial
//package com.java2s; /* Copyright (C) 2015 Rmi Jouannet <remijouannet@gmail.com> This file is part of get10. get10 is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ import android.graphics.Bitmap; import android.graphics.Color; public class Main { public static Bitmap onlyColors(Bitmap bitmap, int[] colors) { if (bitmap == null) { return bitmap; } int width = bitmap.getWidth(); int height = bitmap.getHeight(); int[] pixels = new int[width * height]; bitmap.getPixels(pixels, 0, width, 0, 0, width, height); boolean change; for (int x = 0; x < pixels.length; ++x) { change = true; for (int color : colors) { if (pixels[x] == color) { change = false; } } if (change) { pixels[x] = Color.TRANSPARENT; } } Bitmap newBitmap = Bitmap.createBitmap(width, height, bitmap.getConfig()); newBitmap.setPixels(pixels, 0, width, 0, 0, width, height); return newBitmap; } }