Java tutorial
//package com.java2s; /** * Copyright 2013 ? * * 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. */ import android.graphics.ColorMatrix; import android.graphics.ColorMatrixColorFilter; import android.graphics.PorterDuff; import android.graphics.PorterDuffColorFilter; import android.graphics.drawable.Drawable; public class Main { public static void setGrayFilter(Drawable draw) { ColorMatrix cm = new ColorMatrix(new float[] { 0.299f, 0.587f, 0.114f, 0, 0, 0.299f, 0.587f, 0.114f, 0, 0, 0.299f, 0.587f, 0.114f, 0, 0, 0, 0, 0, 1, 0 }); setMatrixColorFilter(cm, draw); } public static Drawable setMatrixColorFilter(ColorMatrix matrix, Drawable draw) { draw.setColorFilter(new ColorMatrixColorFilter(matrix)); draw.invalidateSelf(); return draw; } public static Drawable setColorFilter(Drawable draw, int color) { // Mode t = PorterDuff.Mode.MULTIPLY; // PorterDuff.Mode.SRC_ATOP, // PorterDuff.Mode.MULTIPLY, return setColorFilter(draw, color, PorterDuff.Mode.MULTIPLY); } public static Drawable setColorFilter(Drawable draw, int color, PorterDuff.Mode mod) { draw.setColorFilter(new PorterDuffColorFilter(color, mod)); draw.invalidateSelf(); return draw; } }