Android 图片倒影效果源码.zip

package com.turlet.shadow; 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.view.SurfaceHolder; import android.view.SurfaceView; /** * * @author turlet * */ public class ImageShadowView extends SurfaceView implements SurfaceHolder.Callback{ private Bitmap mBitmap; public ImageShadowView(Context context) { super(context); // TODO Auto-generated constructor stub SurfaceHolder holder = this.getHolder(); holder.addCallback(this); mBitmap = BitmapFactory.decodeResource(context.getResources(), R.drawable.xiaochuan); } @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub super.onDraw(canvas); int width = mBitmap.getWidth(); int height = mBitmap.getHeight(); canvas.drawBitmap(mBitmap, 0, 0, null); Bitmap nBitmap = setShadow(mBitmap); nBitmap = setAlpha(nBitmap,50);//一半透明 canvas.drawBitmap(nBitmap, 0, height+2, null); } @Override public void surfaceCreated(SurfaceHolder holder) { // TODO Auto-generated method stub Canvas canvas = holder.lockCanvas(); this.onDraw(canvas); holder.unlockCanvasAndPost(canvas); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { // TODO Auto-generated method stub } @Override public void surfaceDestroyed(SurfaceHolder holder) { // TODO Auto-generated method stub } /** * * @param sourceImg 传入的图片 * @param number 0-100(0为完全透明，100为不透明) * @return Bitmap 处理后的图片 */ public static Bitmap setAlpha(Bitmap sourceImg, int number) { int[] argb = new int[sourceImg.getWidth() * sourceImg.getHeight()]; sourceImg.getPixels(argb, 0, sourceImg.getWidth(), 0, 0,sourceImg.getWidth(), sourceImg.getHeight()); number = number * 255 / 100; double round = (double)number/(double)(argb.length); System.out.println(round+ " l="+argb.length +" n="+number); for (int i = 0; i < argb.length; i++) { if(number-i*round>10){ argb[i] = ((int)(number-i*round) << 24) | (argb[i] & 0x00FFFFFF); continue; } else{ argb[i] = (10 << 24) | (argb[i] & 0x00FFFFFF); continue; } } sourceImg = Bitmap.createBitmap(argb, sourceImg.getWidth(), sourceImg.getHeight(), Config.ARGB_8888); return sourceImg; } /** * 传入一张图片，经倒转后，再取一半 * @param bitmap * @return */ public static Bitmap setShadow(Bitmap bitmap){ int width = bitmap.getWidth(); int height = bitmap.getHeight(); Matrix matrix = new Matrix(); matrix.preScale(1, -1); Bitmap shadowImage = Bitmap.createBitmap(bitmap, 0, height / 2, width, height / 2, matrix, false); return shadowImage; } }