Android图片缩放、圆角处理以及倒影特效代码

public class ImageUtil {         //缩放图片    public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h)    {        int width = bitmap.getWidth();        int height = bitmap.getHeight();        Matrix matrix = new Matrix();        float scaleWidth = ((float)w/width);        float scaleHeight = ((float)h/height);        matrix.postScale(scaleHeight, scaleHeight);        Bitmap newBmp = Bitmap.createBitmap(bitmap, 0, 0, width, height,matrix,true);        return newBmp;    }         //Drawable 转换为Bitmap    public static Bitmap drawableToBitmap(Drawable drawable)    {        int width = drawable.getIntrinsicWidth();        int height = drawable.getIntrinsicHeight();        Bitmap bitmap = Bitmap.createBitmap(width, height,                drawable.getOpacity()!= PixelFormat.OPAQUE?Bitmap.Config.ARGB_8888                        :Bitmap.Config.RGB_565);        Canvas canvas = new Canvas(bitmap);        drawable.setBounds(0,0, width, height);        drawable.draw(canvas);        return bitmap;    }         //圆角处理    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;    }         //倒影图片处理    public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap)    {        final int reflectionGap = 4; //magic number?        int width = bitmap.getWidth();        int height = bitmap.getHeight();                 Matrix matrix = new Matrix();        matrix.preScale(1, -1);                 Bitmap reflectionImage = Bitmap.createBitmap(bitmap,                0, height/2 , width, height/2, matrix, false);        Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height/2), Config.ARGB_8888);                 Canvas canvas = new Canvas(bitmapWithReflection);        canvas.drawBitmap(bitmap, 0, 0, null);        Paint deafalutPaint = new Paint();        canvas.drawRect(0, height, width, height + reflectionGap, deafalutPaint);        canvas.drawBitmap(reflectionImage, 0,height + reflectionGap, null);                 Paint paint = new Paint();        LinearGradient shader = new LinearGradient(0,                bitmap.getHeight(),                0,                bitmapWithReflection.getHeight()+reflectionGap,                0x70ffffff,                0x00ffffff,                TileMode.CLAMP);        paint.setShader(shader);        //set the Transfer mode to be porter duff and destionation in        paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));        //Draw a rectangle using the paint with our linear gradient        canvas.drawRect(0, height, width, bitmapWithReflection.getHeight() + reflectionGap, paint);                 return bitmapWithReflection;    }}
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