本文实例讲述了android编程实现gridview控件点击图片变暗效果的方法。分享给大家供大家参考，具体如下：
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@override
public void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_main);
grid = (gridview) findviewbyid(r.id.grid);
grid.setadapter(new gridadapter());
grid.setonitemclicklistener(new onitemclicklistener() {
@override
public void onitemclick(adapterview<?> arg0, view arg1, int arg2,
long arg3) {
toast.maketext(mainactivity.this, "ddd", 1000).show();
}
});
}
class gridadapter extends baseadapter {
@override
public int getcount() {
return imgs.length;
}
@override
public object getitem(int arg0) {
return arg0;
}
@override
public long getitemid(int arg0) {
return arg0;
}
@override
public view getview(int arg0, view view, viewgroup arg2) {
if (view == null) {
holder = new viewholder();
view = layoutinflater.from(mainactivity.this).inflate(
r.layout.imgs, null);
holder.view = (imageview) view.findviewbyid(r.id.gridimg);
view.settag(holder);
} else {
holder = (viewholder) view.gettag();
}
holder.view.setimageresource(imgs[arg0]);
holder.view.setontouchlistener(ontouchlistener);
return view;
}
class viewholder {
imageview view;
}
public ontouchlistener ontouchlistener = new view.ontouchlistener() {
@override
public boolean ontouch(view view, motionevent event) {
switch (event.getaction()) {
case motionevent.action_up:
changelight((imageview) view, 0);
// onclick
break;
case motionevent.action_down:
changelight((imageview) view, -80);
break;
case motionevent.action_move:
// changelight(view, 0);
break;
case motionevent.action_cancel:
changelight((imageview) view, 0);
break;
default:
break;
}
return true;
}
};
}
private void changelight(imageview imageview, int brightness) {
colormatrix matrix = new colormatrix();
matrix.set(new float[] { 1, 0, 0, 0, brightness, 0, 1, 0, 0,
brightness, 0, 0, 1, 0, brightness, 0, 0, 0, 1, 0 });
imageview.setcolorfilter(new colormatrixcolorfilter(matrix));
}
更多关于android相关内容感兴趣的读者可查看本站专题：《android控件用法总结》、《android开发入门与进阶教程》、《android视图view技巧总结》、《android编程之activity操作技巧总结》、《android数据库操作技巧总结》及《android资源操作技巧汇总》
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