Android平台上兑现图片的缩放,圆角,倒影效果 _Android

Android平台上实现图片的缩放,圆角,倒影效果

package?com.lp.imageUI;??
??
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);??
????????/**?
?????????*?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(new?PorterDuffXfermode(Mode.SRC_OUT));??
????????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){??
????????//?图片与倒影间隔距离????
????????final?int?reflectionGap?=?4;??
????????//?图片的宽度????
????????int?width?=?bitmap.getWidth();??
?????????//?图片的高度????
????????int?height?=?bitmap.getHeight();??
??????????
????????Matrix?matrix?=?new?Matrix();??
????????//?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。????
????????Bitmap?reflectionImage?=?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????
????????Bitmap?bitmapWithReflection?=?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????
????????Canvas?canvas?=?new?Canvas(bitmapWithReflection);??
????????//?画原始图片????
????????canvas.drawBitmap(bitmap,?0,?0,?null);??
????????//?画间隔矩形????
????????Paint?deafalutPaint?=?new?Paint();??
????????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????
????????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??
????????//?覆盖效果????
????????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;??
????}??
??????
}??