androidBitmap圓角與倒影實現

/** * 畫一個圓角圖 *  * @param bitmap * @param roundPx * @return */public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),bitmap.getHeight(), Config.ARGB_8888);Canvas canvas = new Canvas(output);final int color = 0xff424242;final Paint paint = new Paint();final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());final RectF rectF = new RectF(rect);paint.setAntiAlias(true);canvas.drawARGB(0, 0, 0, 0);paint.setColor(color);canvas.drawRoundRect(rectF, roundPx, roundPx, paint);paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));canvas.drawBitmap(bitmap, rect, rect, paint);return output;}/** * 建立倒影效果 *  * @return */public boolean createReflectedImages() {// 倒影圖和原圖之間的距離final int reflectionGap = 4;int index = 0;for (GalleryWith3DData imageId : mImageIds) {// 返回原圖解碼之後的bitmap對象Bitmap originalImage = BitmapFactory.decodeResource(mContext.getResources(), imageId.getInteger());int width = originalImage.getWidth();int height = originalImage.getHeight();// 建立矩陣對象Matrix matrix = new Matrix();// 指定矩陣(x軸不變，y軸相反)matrix.preScale(1, -1);// 將矩陣應用到該原圖之中，返回一個寬度不變，高度為原圖1/2的倒影位元影像Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,height / 2, width, height / 2, matrix, false);// 建立一個寬度不變，高度為原圖+倒影圖高度的位元影像Bitmap bitmapWithReflection = Bitmap.createBitmap(width,(height + height / 2), Config.ARGB_8888);// 將上面建立的位元影像初始化到畫布Canvas canvas = new Canvas(bitmapWithReflection);canvas.drawBitmap(getRoundedCornerBitmap(originalImage, 20), 0, 0,null);int len = imageId.getstr().length();double lenWeght = len * 50 * 0.9;int ban = width / 2;int ban1 = (int) (lenWeght / 2);int hua = ban - ban1;if (imageId.getFlagRecommend()) {canvas.rotate(30);canvas.drawText(mStrRecommend, hua - 20, 150,createPaint(Color.RED));canvas.rotate(-30);}Paint deafaultPaint = new Paint();deafaultPaint.setAntiAlias(false);canvas.drawBitmap(getRoundedCornerBitmap(reflectionImage, 20), 0,height + reflectionGap, null);Paint paint = new Paint();paint.setAntiAlias(false);/** * 參數一:為漸層起初點座標x位置， 參數二:為y軸位置， 參數三和四:分辨對應漸層終點， 最後參數為平鋪方式， * 這裡設定為鏡像Gradient是基於Shader類，所以我們通過Paint的setShader方法來設定這個漸層*/LinearGradient shader = new LinearGradient(0,originalImage.getHeight(), 0,bitmapWithReflection.getHeight() + reflectionGap,0x70ffffff, 0x00ffffff, TileMode.MIRROR);// 設定陰影paint.setShader(shader);paint.setXfermode(new PorterDuffXfermode(android.graphics.PorterDuff.Mode.DST_IN));// 用已經定義好的畫筆構建一個矩形陰影漸層效果canvas.drawRect(0, height, width,                            bitmapWithReflection.getHeight() + reflectionGap, paint);canvas.drawText(imageId.getstr(), hua, 430,createPaint(Color.WHITE));// 建立一個ImageView用來顯示已經畫好的bitmapWithReflectionImageView imageView = new ImageView(mContext);imageView.setImageBitmap(bitmapWithReflection);// 設定imageView大小 ，也就是最終顯示的圖片大小imageView.setLayoutParams(new GalleryWith3D.LayoutParams(150, 250));// imageView.setScaleType(ScaleType.MATRIX);mImages[index++] = imageView;}return true;}