非常不错的倒影的3d gallery效果

package com.example.demo; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Bitmap.Config; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.LinearGradient; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.PorterDuff.Mode; import android.graphics.PorterDuffXfermode; import android.graphics.Shader.TileMode; import android.os.Handler; import android.view.KeyEvent; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.ImageView; import android.widget.ImageView.ScaleType; public class ImageAdapter extends BaseAdapter { private ImageView[] mImages; // 保存倒影图片的数组 private Context mContext; public List<Map<String, Object>> list; public Integer[] imgs = { R.drawable.image01, R.drawable.image02, R.drawable.image03, R.drawable.image04, R.drawable.image05, R.drawable.image06}; public String[] titles = { "美图01", "美图02", "美图03", "美图04", "美图05", "美图06"}; public ImageAdapter(Context c) { this.mContext = c; list = new ArrayList<Map<String, Object>>(); for (int i = 0; i < imgs.length; i++) { HashMap<String, Object> map = new HashMap<String, Object>(); map.put("image", imgs[i]); list.add(map); } mImages = new ImageView[list.size()]; } /** 反射倒影 */ public boolean createReflectedImages() { final int reflectionGap = 4; final int Height = 200; int index = 0; for (Map<String, Object> map : list) { Integer id = (Integer) map.get("image"); Bitmap originalImage = BitmapFactory.decodeResource(mContext.getResources(), id); // 获取原始图片 int width = originalImage.getWidth(); int height = originalImage.getHeight(); float scale = Height / (float)height; Matrix sMatrix = new Matrix(); sMatrix.postScale(scale, scale); Bitmap miniBitmap = Bitmap.createBitmap(originalImage, 0, 0, originalImage.getWidth(), originalImage.getHeight(), sMatrix, true); int mwidth = miniBitmap.getWidth(); int mheight = miniBitmap.getHeight(); Matrix matrix = new Matrix(); matrix.preScale(1, -1); // 图片矩阵变换（从低部向顶部的倒影） Bitmap reflectionImage = Bitmap.createBitmap(miniBitmap, 0, mheight/2, mwidth, mheight/2, matrix, false); // 截取原图下半部分 Bitmap bitmapWithReflection = Bitmap.createBitmap(mwidth, (mheight + mheight / 2), Config.ARGB_8888); // 创建倒影图片（高度为原图3/2） Canvas canvas = new Canvas(bitmapWithReflection); // 绘制倒影图（原图 + 间距 + 倒影） canvas.drawBitmap(miniBitmap, 0, 0, null); // 绘制原图 Paint paint = new Paint(); canvas.drawRect(0, mheight, mwidth, mheight + reflectionGap, paint); // 绘制原图与倒影的间距 canvas.drawBitmap(reflectionImage, 0, mheight + reflectionGap, null); // 绘制倒影图 paint = new Paint(); LinearGradient shader = new LinearGradient(0, miniBitmap.getHeight(), 0, bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP); paint.setShader(shader); // 线性渐变效果 paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN)); // 倒影遮罩效果 canvas.drawRect(0, mheight, mwidth, bitmapWithReflection.getHeight() + reflectionGap, paint); // 绘制倒影的阴影效果 ImageView imageView = new ImageView(mContext); imageView.setImageBitmap(bitmapWithReflection); // 设置倒影图片 imageView.setLayoutParams(new GalleryView.LayoutParams(203,400) ); imageView .setScaleType(ScaleType.FIT_XY); mImages[index++] = imageView; } return true; } @Override public int getCount() { return Integer.MAX_VALUE; } @Override public Object getItem(int position) { return imgs[position%imgs.length]; } @Override public long getItemId(int position) { return position%imgs.length; } @Override public View getView(int position, View convertView, ViewGroup parent) { //return mImages[position]; return mImages[position % imgs.length]; // 显示倒影图片（当前获取焦点） } public float getScale(boolean focused, int offset) { return Math.max(0, 1.0f / (float) Math.pow(2, Math.abs(offset))); } }