Android 实现图片的圆角，倒影，转换

package com.android.tutor;　import android.graphics.Bitmap;　　import android.graphics.Canvas;　　import android.graphics.LinearGradient;　　import android.graphics.Matrix;　　import android.graphics.Paint;　　import android.graphics.PixelFormat;　　import android.graphics.PorterDuffXfermode;　　import android.graphics.Rect;　　import android.graphics.RectF;　　import android.graphics.Bitmap.Config;　　import android.graphics.PorterDuff.Mode;　　import android.graphics.Shader.TileMode;　　import android.graphics.drawable.Drawable;　　public class ImageUtil {　　//放大缩小图片　　public static Bitmap zoomBitmap(Bitmap bitmap,int w,int h){　　int width = bitmap.getWidth();　　int height = bitmap.getHeight();　Matrix matrix = new Matrix();　　float scaleWidht = ((float)w / width);　　float scaleHeight = ((float)h / height);　　matrix.postScale(scaleWidht, scaleHeight);　　Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);　　return newbmp;　　}　　//将Drawable转化为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;　　}　　//获得圆角图片的方法　　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;　　}　//获得带倒影的图片方法　　public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap){　　final int reflectionGap = 4;　　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 destination 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;　　   }　　}