图片 倒影效果

public boolean createReflectedImages() {

final int reflectionGap =4;//原图与倒影之间的间隙

int index =0;

for(Map map : list) {

Integer id = (Integer) map.get("image");

Bitmap originalImage = BitmapFactory.decodeResource(

mContext.getResources(),id);// 获得图片资源

// 获得图片的长宽

int width = originalImage.getWidth();

int height = originalImage.getHeight();

Matrix matrix =newMatrix();

matrix.preScale(1,-1);// 实现图片的反转

Bitmap reflectionImage = Bitmap.createBitmap(originalImage,0,

height /2,width,height /2,matrix, false);// 创建反转后的图片Bitmap对象，图片高是原图的一半

Bitmap bitmapWithReflection = Bitmap.createBitmap(width,

(height + height /2),Config.ARGB_8888);// 创建标准的Bitmap对象，宽和原图一致，高是原图的1.5倍

Canvas canvas =newCanvas(bitmapWithReflection);

canvas.drawBitmap(originalImage,0,0, null);// 创建画布对象，将原图画于画布，起点是原点位置

Paint paint =newPaint();

canvas.drawRect(0,height,width,height + reflectionGap,paint);

canvas.drawBitmap(reflectionImage,0,height + reflectionGap, null);// 将反转后的图片画到画布中

paint =newPaint();

LinearGradient shader =newLinearGradient(0,

originalImage.getHeight(),0,

bitmapWithReflection.getHeight() + reflectionGap,

0x70ffffff,0x00ffffff,TileMode.MIRROR);// 创建线性渐变LinearGradient对象

paint.setShader(shader);// 绘制

paint.setXfermode(newPorterDuffXfermode(Mode.DST_IN));//倒影遮罩效果

canvas.drawRect(0,height,width,bitmapWithReflection.getHeight()

+ reflectionGap,paint);// 画布画出反转图片大小区域，然后把渐变效果加到其中，就出现了图片的倒影效果

ImageView imageView =newImageView(mContext);

imageView.setImageBitmap(bitmapWithReflection);// 设置带倒影的Bitmap

//设置ImageView的大小，可以根据图片大小设置

// imageView.setLayoutParams(newmyGallery.LayoutParams(width,height));

imageView.setLayoutParams(newmyGallery.LayoutParams(250,500));//设置ImageView的大小，可根据需要设置固定宽高

imageView.setScaleType(ScaleType.FIT_CENTER);//将图片按比例缩放

mImages[index++] = imageView;

}

return true;

}