我们打开qq空间的时候有个箭头按钮点击之后弹出popupwindow会根据位置的变化显示在箭头的上方还是下方，比普通的popupwindow弹在屏幕中间显示好看的多。
先看qq空间效果图：
这个要实现这个效果可以分几步进行
1.第一步自定义popupwindow，实现如图的样式，这个继承popupwindow自定义布局很容易实现
2.得到点击按钮的位置，根据位置是否在屏幕的中间的上方还是下方，将popupwindow显示在控件的上方或者下方
3.适配问题，因为popupwindow上面的操作列表是动态的所以要自定义listview
4.动画效果 背景变暗
通过步骤分析，我们就很清晰的了解我们要做什么，话不多说，从第一步开始吧
下面自定义popupwindow实现效果
1.重写listview，重新计算高度（一般也应用于解决scrollview嵌套listview只显示一行的问题）
public class mylistview extends listview {
public mylistview(context context, attributeset attrs) {
super(context, attrs);
}
public mylistview(context context) {
super(context);
}
public mylistview(context context, attributeset attrs, int defstyle) {
super(context, attrs, defstyle);
}
@override
public void onmeasure(int widthmeasurespec, int heightmeasurespec) {
super.onmeasure(widthmeasurespec, measurespec.makemeasurespec(integer.max_value >> 2,
measurespec.at_most));
}
}
2.自定义popupwindow的布局文件
2.popupwindow弹出动画以及消失动画
popshow_operation_anim_down.xml
popshow_operation_anim_up.xml
消失动画是渐隐动画可以自己定义，同理。
3.重写popupwindow了
public class customoperationpopwindow extends popupwindow {
private context context;
private view conentview;
private view backgroundview;
private animation anim_backgroundview;
private mylistview listview;
private typeselectpopuadapter selectadapter;
imageview arrow_up, arrow_down;
list typeselectlist = new arraylist<>();
int[] location = new int[2];
private onitemlistener onitemlistener;
private adapterview.onitemclicklistener onitemclicklistener;
public interface onitemlistener {
public void onitemlistener(int position, typeselect typeselect);
}
;
public void setonitemmylistener(onitemlistener onitemlistener) {
this.onitemlistener = onitemlistener;
}
public customoperationpopwindow(context context) {
this.context = context;
initview();
}
public customoperationpopwindow(context context, list typeselectlist) {
this.context = context;
this.typeselectlist = typeselectlist;
initview();
}
private void initview() {
this.anim_backgroundview = animationutils.loadanimation(context, r.anim.alpha_show_anim);
layoutinflater inflater = (layoutinflater) context
.getsystemservice(context.layout_inflater_service);
this.conentview = inflater.inflate(r.layout.view_operation_popupwindow, null);
// 设置selectpicpopupwindow的view
this.setcontentview(conentview);
// 设置selectpicpopupwindow弹出窗体的宽
this.setwidth(layoutparams.match_parent);
// 设置selectpicpopupwindow弹出窗体的高
this.setheight(layoutparams.wrap_content);
// 设置selectpicpopupwindow弹出窗体可点击
this.setfocusable(true);
this.setoutsidetouchable(true);
// 刷新状态
this.update();
// 实例化一个colordrawable颜色为半透明
colordrawable dw = new colordrawable(0000000000);
// 点back键和其他地方使其消失,设置了这个才能触发ondismisslistener ，设置其他控件变化等操作
this.setbackgrounddrawable(dw);
// 设置selectpicpopupwindow弹出窗体动画效果
this.setanimationstyle(r.style.operation_popwindow_anim_style_up);
this.listview = (mylistview) conentview.findviewbyid(r.id.lv_list);
this.arrow_up = (imageview) conentview.findviewbyid(r.id.arrow_up);
this.arrow_down = (imageview) conentview.findviewbyid(r.id.arrow_down);
//设置适配器
this.selectadapter = new typeselectpopuadapter(context, typeselectlist,
r.layout.item_operation_popu);
this.listview.setadapter(selectadapter);
this.listview.setonitemclicklistener(new adapterview.onitemclicklistener() {
@override
public void onitemclick(adapterview parent, view view, int position, long id) {
if (isshowing()) {
dismiss();
}
onitemlistener.onitemlistener(position, typeselectlist.get(position));
}
});
this.setondismisslistener(new ondismisslistener() {
@override
public void ondismiss() {
if (backgroundview != null) {
backgroundview.setvisibility(view.gone);
}
}
});
}
//设置数据
public void setdatasource(list typeselectlist) {
this.typeselectlist = typeselectlist;
this.selectadapter.notifydatasetchanged();
}
/**
* 没有半透明背景 显示popupwindow
*
* @param
*/
public void showpopupwindow(view v) {
v.getlocationonscreen(location); //获取控件的位置坐标
//获取自身的长宽高
conentview.measure(view.measurespec.unspecified, view.measurespec.unspecified);
if (location[1] > mainapplication.screen_h / 2 100) { //mainapplication.screen_h 为屏幕的高度，方法可以自己写
this.setanimationstyle(r.style.operation_popwindow_anim_style_up);
arrow_up.setvisibility(view.gone);
arrow_down.setvisibility(view.visible);
this.showatlocation(v, gravity.no_gravity, (location[0]), location[1] - conentview.getmeasuredheight());
} else {
this.setanimationstyle(r.style.operation_popwindow_anim_style_down);
arrow_up.setvisibility(view.visible);
arrow_down.setvisibility(view.gone);
this.showasdropdown(v, 0, 0);
}
}
/**
* 携带半透明背景 显示popupwindow
*
* @param
*/
public void showpopupwindow(view v, view backgroundview) {
this.backgroundview = backgroundview;
v.getlocationonscreen(location); //获取控件的位置坐标
//获取自身的长宽高
conentview.measure(view.measurespec.unspecified, view.measurespec.unspecified);
backgroundview.setvisibility(view.visible);
//对view执行动画
backgroundview.startanimation(anim_backgroundview);
if (location[1] > mainapplication.screen_h / 2 100) { //若是控件的y轴位置大于屏幕高度的一半，向上弹出
this.setanimationstyle(r.style.operation_popwindow_anim_style_up);
arrow_up.setvisibility(view.gone);
arrow_down.setvisibility(view.visible);
this.showatlocation(v, gravity.no_gravity, (location[0]), location[1] - conentview.getmeasuredheight()); //显示指定控件的上方
} else {
this.setanimationstyle(r.style.operation_popwindow_anim_style_down); //反之向下弹出
arrow_up.setvisibility(view.visible);
arrow_down.setvisibility(view.gone);
this.showasdropdown(v, 0, 0); //显示指定控件的下方
}
}
/**
* 显示popupwindow 根据特殊要求高度显示位置
*
* @param
*/
public void showpopupwindow(view v, view backgroundview,int hight) {
this.backgroundview = backgroundview;
v.getlocationonscreen(location);
//获取自身的长宽高
conentview.measure(view.measurespec.unspecified, view.measurespec.unspecified);
backgroundview.setvisibility(view.visible);
//对view执行动画
backgroundview.startanimation(anim_backgroundview);
if (location[1] > mainapplication.screen_h / 2 100) {
this.setanimationstyle(r.style.operation_popwindow_anim_style_up);
arrow_up.setvisibility(view.gone);
arrow_down.setvisibility(view.visible);
this.showatlocation(v, gravity.no_gravity, (location[0]), location[1] - conentview.getmeasuredheight()-hight);
} else {
this.setanimationstyle(r.style.operation_popwindow_anim_style_down);
arrow_up.setvisibility(view.visible);
arrow_down.setvisibility(view.gone);
this.showasdropdown(v, 0, 0);
}
}
}
4.代码中的用法
1.
customoperationpopwindow customoperationpopwindow = new customoperationpopwindow(this, operationtypeselectlist);
customoperationpopwindow.setonitemmylistener(new customoperationpopwindow.onitemlistener() {
@override
public void onitemlistener(int position, typeselect typeselect) {
//此处实现列表点击所要进行的操作
}
});
2.
textview.setonclicklistener(new view.onclicklistener() {
@override
public void onclick(view v) {
customoperationpopwindow.showpopupwindow(textview);//可以传个半透明view v_background过去根据业务需要显示隐藏
}
});
5.最终实际效果
以上代码为几乎主要全部代码，主要是popupwindow的用法，思路清晰一步一步实现很简单。
以上所述是小编给大家介绍的android开发仿qq空间根据位置弹出popupwindow显示更多操作效果，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对呐喊教程网站的支持！
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