android Bitmap圆角与倒影的具体实现代码
l298中文资料,穿越成陈阿娇,杨立杰
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/**
* 画一个圆角图
*
* @param bitmap
* @param roundpx
* @return
*/
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;
}
/**
* 创建倒影效果
*
* @return
*/
public boolean createreflectedimages() {
// 倒影图和原图之间的距离
final int reflectiongap = 4;
int index = 0;
for (gallerywith3ddata imageid : mimageids) {
// 返回原图解码之后的bitmap对象
bitmap originalimage = bitmapfactory.decoderesource(
mcontext.getresources(), imageid.getinteger());
int width = originalimage.getwidth();
int height = originalimage.getheight();
// 创建矩阵对象
matrix matrix = new matrix();
// 指定矩阵(x轴不变，y轴相反)
matrix.prescale(1, -1);
// 将矩阵应用到该原图之中，返回一个宽度不变，高度为原图1/2的倒影位图
bitmap reflectionimage = bitmap.createbitmap(originalimage, 0,
height / 2, width, height / 2, matrix, false);
// 创建一个宽度不变，高度为原图+倒影图高度的位图
bitmap bitmapwithreflection = bitmap.createbitmap(width,
(height + height / 2), config.argb_8888);
// 将上面创建的位图初始化到画布
canvas canvas = new canvas(bitmapwithreflection);
canvas.drawbitmap(getroundedcornerbitmap(originalimage, 20), 0, 0,
null);
int len = imageid.getstr().length();
double lenweght = len * 50 * 0.9;
int ban = width / 2;
int ban1 = (int) (lenweght / 2);
int hua = ban - ban1;
if (imageid.getflagrecommend()) {
canvas.rotate(30);
canvas.drawtext(mstrrecommend, hua - 20, 150,
createpaint(color.red));
canvas.rotate(-30);
}
paint deafaultpaint = new paint();
deafaultpaint.setantialias(false);
canvas.drawbitmap(getroundedcornerbitmap(reflectionimage, 20), 0,
height + reflectiongap, null);
paint paint = new paint();
paint.setantialias(false);
/**
* 参数一:为渐变起初点坐标x位置， 参数二:为y轴位置， 参数三和四:分辨对应渐变终点， 最后参数为平铺方式，
* 这里设置为镜像gradient是基于shader类，所以我们通过paint的setshader方法来设置这个渐变
*/
lineargradient shader = new lineargradient(0,
originalimage.getheight(), 0,
bitmapwithreflection.getheight() + reflectiongap,
0x70ffffff, 0x00ffffff, tilemode.mirror);
// 设置阴影
paint.setshader(shader);
paint.setxfermode(new porterduffxfermode(
android.graphics.porterduff.mode.dst_in));
// 用已经定义好的画笔构建一个矩形阴影渐变效果
canvas.drawrect(0, height, width, bitmapwithreflection.getheight() + reflectiongap, paint);
canvas.drawtext(imageid.getstr(), hua, 430,
createpaint(color.white));
// 创建一个imageview用来显示已经画好的bitmapwithreflection
imageview imageview = new imageview(mcontext);
imageview.setimagebitmap(bitmapwithreflection);
// 设置imageview大小 ，也就是最终显示的图片大小
imageview.setlayoutparams(new gallerywith3d.layoutparams(150, 250));
// imageview.setscaletype(scaletype.matrix);
mimages[index++] = imageview;
}
return true;
}
下面是效果图:
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