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把做工程过程常用的一些代码段做个记录，下面代码是关于java实现图片倒影的的代码，应该对大家有较大用处。
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public class buttonimageactivity extends activity {
private imageview image_btn;
@override
public void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.main);
image_btn=(imageview)findviewbyid(r.id.image_btn);
bitmap bitmap =((bitmapdrawable)getresources().getdrawable(r.drawable.image_btn)).getbitmap();
image_btn.setimagebitmap(createreflectedimage(bitmap));
image_btn.setonclicklistener(new onclicklistener() {
public void onclick(view v) {
}
});
}
private bitmap createreflectedimage(bitmap originalbitmap) {
final int reflectiongap = 4;
int width = originalbitmap.getwidth();
int height = originalbitmap.getheight();
matrix matrix = new matrix();
matrix.prescale(1, -1);
bitmap reflectionbitmap = bitmap.createbitmap(originalbitmap, 0,
height / 2, width, height / 2, matrix, false);
bitmap withreflectionbitmap = bitmap.createbitmap(width, (height
+ height / 2 + reflectiongap), config.argb_8888);
canvas canvas = new canvas(withreflectionbitmap);
canvas.drawbitmap(originalbitmap, 0, 0, null);
paint defaultpaint = new paint();
canvas.drawrect(0, height, width, height + reflectiongap, defaultpaint);
canvas.drawbitmap(reflectionbitmap, 0, height + reflectiongap, null);
paint paint = new paint();
lineargradient shader = new lineargradient(0, originalbitmap.getheight(),
0, withreflectionbitmap.getheight(), 0x70ffffff, 0x00ffffff,
tilemode.mirror);
paint.setshader(shader);
paint.setxfermode(new porterduffxfermode(mode.dst_in));
canvas.drawrect(0, height, width, withreflectionbitmap.getheight(), paint);
return withreflectionbitmap;
}
}
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