Java tutorial
//package com.java2s; /* * Copyright (C) 2013 The Android Open Source Project * * 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.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.RectF; public class Main { public static void drawShade(Canvas canvas, RectF bounds) { int w = canvas.getWidth(); int h = canvas.getHeight(); Paint p = new Paint(); p.setStyle(Paint.Style.FILL); p.setColor(Color.BLACK & 0x88000000); RectF r = new RectF(); r.set(0, 0, w, bounds.top); canvas.drawRect(r, p); r.set(0, bounds.top, bounds.left, h); canvas.drawRect(r, p); r.set(bounds.left, bounds.bottom, w, h); canvas.drawRect(r, p); r.set(bounds.right, bounds.top, w, bounds.bottom); canvas.drawRect(r, p); } }