使用Android自带Gallery组件实现CoverFlow,源码+解析(An-Beer工作室).docVIP

使用Android自带Gallery组件实现CoverFlow，源码+解析 android, gallery, coverflow, 源码, 解析 本帖最后由 kearnel 于 2010-10-24 11:46 编辑 首先声明，源代码转载自国外Neil Davies，使用Apache2.0开源协议，请使用源代码的人自觉遵守协议内容。本文为Kearnel原创，转载请注明出处。以下是正文：使用过Android自带的gallery组件的人都知道，gallery实现的效果就是拖动浏览一组图片，相比iphone里也是用于拖动浏览图片的coverflow，显然逊色不少。实际上，可以通过扩展gallery，通过伪3D变换可以基本实现coverflow的效果。本文通过源代码解析这一功能的实现。具体代码作用可参照注释。最终实现效果如下： 下载 (212.53 KB)实现效果 2010-10-23 19:47 要使用gallery，我们必须首先给其指定一个adapter。在这里，我们实现了一个自定义的ImageAdapter，为图片制作倒影效果。传入参数为context和程序内drawable中的图片ID数组。之后调用其中的createReflectedImages()方法分别创造每一个图像的倒影效果，生成对应的ImageView数组，最后在getView()中返回。 /* * Copyright (C) 2010 Neil Davies * * 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 * * /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. * * This code is base on the Android Gallery widget and was Created * by Neil Davies neild001 at gmail dot com to be a Coverflow widget * * @author Neil Davies */ public class ImageAdapter extends BaseAdapter { int mGalleryItemBackground; private Context mContext; private Integer[] mImageIds ; private ImageView[] mImages; public ImageAdapter(Context c, int[] ImageIds) { mContext = c; mImageIds = ImageIds; mImages = new ImageView[mImageIds.length]; } public boolean createReflectedImages() { // The gap we want between the reflection and the original image final int reflectionGap = 4; int index = 0; for (int imageId : mImageIds) { Bitmap originalImage = BitmapFactory.decodeResource( mContext.getResources(), imageId); int width = originalImage.getWidth(); int height = originalImage.getHeight(); // This will not scale but will flip on