android制作圆角图片和图片倒影

From:http://blog.csdn.net/mldxs/article/details/9179515

主要包含了放大缩小圆角图片和倒影

Java代码

packagecom.lp.imageUI;
importandroid.graphics.Bitmap;
importandroid.graphics.Canvas;
importandroid.graphics.LinearGradient;
importandroid.graphics.Matrix;
importandroid.graphics.Paint;
importandroid.graphics.PixelFormat;
importandroid.graphics.PorterDuffXfermode;
importandroid.graphics.Rect;
importandroid.graphics.RectF;
importandroid.graphics.Bitmap.Config;
importandroid.graphics.PorterDuff.Mode;
importandroid.graphics.Shader.TileMode;
importandroid.graphics.drawable.Drawable;
publicclassImageUtil{
//放大缩小图片
publicstaticBitmapzoomBitmap(Bitmapbitmap,intw,inth){
intwidth=bitmap.getWidth();
intheight=bitmap.getHeight();
Matrixmatrix=newMatrix();
floatscaleWidht=((float)w/width);
floatscaleHeight=((float)h/height);
matrix.postScale(scaleWidht,scaleHeight);
Bitmapnewbmp=Bitmap.createBitmap(bitmap,0,0,width,height,matrix,true);
returnnewbmp;
}
//将Drawable转化为Bitmap
publicstaticBitmapdrawableToBitmap(Drawabledrawable){
intwidth=drawable.getIntrinsicWidth();
intheight=drawable.getIntrinsicHeight();
Bitmapbitmap=Bitmap.createBitmap(width,height,
drawable.getOpacity()!=PixelFormat.OPAQUE?Bitmap.Config.ARGB_8888
:Bitmap.Config.RGB_565);
Canvascanvas=newCanvas(bitmap);
drawable.setBounds(0,0,width,height);
drawable.draw(canvas);
returnbitmap;
}
//获得圆角图片的方法
publicstaticBitmapgetRoundedCornerBitmap(Bitmapbitmap,floatroundPx){
Bitmapoutput=Bitmap.createBitmap(bitmap.getWidth(),bitmap
.getHeight(),Config.ARGB_8888);
Canvascanvas=newCanvas(output);
finalintcolor=0xff424242;
finalPaintpaint=newPaint();
finalRectrect=newRect(0,0,bitmap.getWidth(),bitmap.getHeight());
finalRectFrectF=newRectF(rect);
paint.setAntiAlias(true);
canvas.drawARGB(0,0,0,0);
paint.setColor(color);
/**
*画一个圆角矩形
*rectF:矩形
*roundPx圆角在x轴上或y轴上的半径
*/
canvas.drawRoundRect(rectF,roundPx,roundPx+10,paint);
//设置两张图片相交时的模式
//setXfermode前的是dst之后的是src
//在正常的情况下，在已有的图像上绘图将会在其上面添加一层新的形状。
//如果新的Paint是完全不透明的，那么它将完全遮挡住下面的Paint；
//PorterDuffXfermode就可以来解决这个问题
//canvas原有的图片可以理解为背景就是dst
//新画上去的图片可以理解为前景就是src
//paint.setXfermode(newPorterDuffXfermode(Mode.SRC_OUT));
paint.setXfermode(newPorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap,rect,rect,paint);
returnoutput;
}
//获得带倒影的图片方法
publicstaticBitmapcreateReflectionImageWithOrigin(Bitmapbitmap){
//图片与倒影间隔距离
finalintreflectionGap=4;
//图片的宽度
intwidth=bitmap.getWidth();
//图片的高度
intheight=bitmap.getHeight();
Matrixmatrix=newMatrix();
//图片缩放，x轴变为原来的1倍，y轴为-1倍,实现图片的反转
matrix.preScale(1,-1);
//创建反转后的图片Bitmap对象，图片高是原图的一半。
BitmapreflectionImage=Bitmap.createBitmap(bitmap,
0,height/2,width,height/2,matrix,false);
//创建标准的Bitmap对象，宽和原图一致，高是原图的1.5倍。可以理解为这张图将会在屏幕上显示是原图和倒影的合体
BitmapbitmapWithReflection=Bitmap.createBitmap(width,(height+height/2),Config.ARGB_8888);
//构造函数传入Bitmap对象，为了在图片上画图
Canvascanvas=newCanvas(bitmapWithReflection);
//画原始图片
canvas.drawBitmap(bitmap,0,0,null);
//画间隔矩形
PaintdeafalutPaint=newPaint();
canvas.drawRect(0,height,width,height+reflectionGap,
deafalutPaint);
//画倒影图片
canvas.drawBitmap(reflectionImage,0,height+reflectionGap,null);
//实现倒影渐变效果
Paintpaint=newPaint();
LinearGradientshader=newLinearGradient(0,
bitmap.getHeight(),0,bitmapWithReflection.getHeight()
+reflectionGap,0x70ffffff,0x00ffffff,TileMode.CLAMP);
paint.setShader(shader);
//SettheTransfermodetobeporterduffanddestinationin
//覆盖效果
paint.setXfermode(newPorterDuffXfermode(Mode.DST_IN));
//Drawarectangleusingthepaintwithourlineargradient
canvas.drawRect(0,height,width,bitmapWithReflection.getHeight()
+reflectionGap,paint);
returnbitmapWithReflection;
}
}

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