Android自定义组件ListPopWindow

先看一下效果：

效果就是这样，看一下实现，其实也没多难，就是想开源出来供小伙伴们使用，如有不合理地方，希望大家多多指正。
1.自定义popwindow
首先我们分析一下，这样的效果肯定是一个popwindow嵌套着listview，而上面的title、和下面的cancel是两个文本框，实现起来也比较简单。
然后我们在popwindow中声明两个接口，用来回调cancel和item的点击事件

public interface onpopitemclicklistener{
  void onpopitemclick(view view,int position);
 }

 public interface onbottomtextviewclicklistener{
  void onbottomclick();
 }

然后再设置一些popwindow的一些属性

parentview = layoutinflater.from(context).inflate(r.layout.list_popwindow,null);
  setcontentview(parentview);
  lv = (listview) parentview.findviewbyid(r.id.lv_popwindow);
  //设置弹出窗体的高
  this.setwidth(viewgroup.layoutparams.match_parent);
  this.setheight(viewgroup.layoutparams.match_parent);
  //设置弹出窗体可点击
  this.setfocusable(true);
  //实例化一个colordrawable颜色为半透明
  colordrawable dw = new colordrawable(0xb0000000);
  //设置selectpicpopupwindow弹出窗体的背景
  this.setbackgrounddrawable(dw);

看一下整体的代码吧：

public class listpopwindow extends popupwindow{

 private context context;  //上下文
 private view parentview;  //父视图
 private list<popbean> datalist; //item数据源
 private onpopitemclicklistener listener; //item点击接口
 private listview lv; //item列表视图
 private view viewtop; //title视图 
 private string toptext,bottomtext; //title文字，bottom文字
 private textview tvtop,tvbottom; //title文本，bottom文本
 private popwindowadapter adapter; //适配器
 private onbottomtextviewclicklistener bottomlistener;//底部点击接口


 public interface onpopitemclicklistener{
  void onpopitemclick(view view,int position);
 }

 public interface onbottomtextviewclicklistener{
  void onbottomclick();
 }

 public listpopwindow(context context,onpopitemclicklistener listener,onbottomtextviewclicklistener bottomlistener,
       view parentview,list<popbean> datalist,string bottomtext,string toptext){
  this.context = context;
  this.listener = listener;
  this.parentview = parentview;
  this.datalist = datalist;
  this.bottomlistener = bottomlistener;
  this.toptext = toptext;
  this.bottomtext = bottomtext;

  initviews();
 }


 private void initviews(){
  parentview = layoutinflater.from(context).inflate(r.layout.list_popwindow,null);
  setcontentview(parentview);
  lv = (listview) parentview.findviewbyid(r.id.lv_popwindow);
  //设置弹出窗体的高
  this.setwidth(viewgroup.layoutparams.match_parent);
  this.setheight(viewgroup.layoutparams.match_parent);
  //设置弹出窗体可点击
  this.setfocusable(true);
  //实例化一个colordrawable颜色为半透明
  colordrawable dw = new colordrawable(0xb0000000);
  //设置selectpicpopupwindow弹出窗体的背景
  this.setbackgrounddrawable(dw);

  //view添加ontouchlistener监听判断获取触屏位置如果在布局外面则销毁弹出框
  parentview.setontouchlistener(new view.ontouchlistener() {
   public boolean ontouch(view v, motionevent event) {
    int height = parentview.findviewbyid(r.id.ll_bottom).gettop();
    int y = (int) event.gety();
    if (event.getaction() == motionevent.action_up) {
     if (y > height) {
      dismiss();
     }
    }
    return true;
   }
  });

  update();
  viewtop = parentview.findviewbyid(r.id.view_line1);
  tvbottom = (textview) parentview.findviewbyid(r.id.tv_popwindow_bottom);
  tvtop = (textview) parentview.findviewbyid(r.id.tv_popwindow_first);
  adapter = new popwindowadapter(context,datalist,false);
  lv.setadapter(adapter);

  if (!textutils.isempty(toptext)){
   tvtop.setvisibility(view.visible);
   tvtop.settext(toptext);
   viewtop.setvisibility(view.visible);
  }
  else {
   tvtop.setvisibility(view.gone);
   viewtop.setvisibility(view.gone);
  }

  if (!textutils.isempty(bottomtext)){
   tvbottom.setvisibility(view.visible);
   tvbottom.settext(bottomtext);
  }
  else {
   tvbottom.setvisibility(view.gone);
  }

  lv.setonitemclicklistener(new adapterview.onitemclicklistener() {
   @override
   public void onitemclick(adapterview<?> adapterview, view view, int i, long l) {
    listener.onpopitemclick(view, i);
   }
  });

  tvbottom.setonclicklistener(new view.onclicklistener() {
   @override
   public void onclick(view view) {
    bottomlistener.onbottomclick();
   }
  });

 }

}

2.看一些item的bean

这里我就声明了title和图片的id

package com.hankkin.library;


public class popbean {
 private string title;
 private int icon_res;

 public string gettitle() {
  return title;
 }

 public void settitle(string title) {
  this.title = title;
 }

 public int geticon_res() {
  return icon_res;
 }

 public void seticon_res(int icon_res) {
  this.icon_res = icon_res;
 }

 public popbean(string title, int icon_res) {
  this.title = title;
  this.icon_res = icon_res;
 }
}

3.自定义adapter适配器

这里面可能要注意的就是item的背景设置，有的是上半部分圆角、有的是下半部分圆角，特殊处理一下

@override
 public view getview(int i, view view, viewgroup viewgroup) {
  viewholder holder;
  if (view == null) {
   view = inflater.inflate(r.layout.listview_popwindow_item, null);
   holder = new viewholder();
   holder.tv_name = (textview) view.findviewbyid(r.id.tv_title);
   holder.v_line = (view) view.findviewbyid(r.id.v_line);
   view.settag(holder);
  } else {
   holder = (viewholder) view.gettag();
  }

  holder.tv_name.settext(datalist.get(i).gettitle());


  if (datalist.size() - 1 == i) {
   holder.v_line.setvisibility(view.invisible);
   holder.tv_name.setbackground(context.getresources().getdrawable(r.drawable.selector_bottom_half));
  } else {
   holder.v_line.setvisibility(view.visible);
   holder.tv_name.setbackground(context.getresources().getdrawable(r.drawable.list_gray_item));
  }
  return view;
 }

最后看一下调用

activity需要实现item接口（onpopitemclicklistener）和底部按钮接口（onbottomtextviewclicklistener）

public void show(view view){
  list<popbean> pops = new arraylist<>();
  for (int i=0;i<5;i++){
   popbean pop = new popbean("item"+i,0);
   pops.add(pop);
  }
  popwindow = new listpopwindow(mainactivity.this,this,this,rl,pops,"cancel","title");
  popwindow.showatlocation(rl, gravity.center| gravity.bottom,0,0);
 }

以上就是本文的全部内容，希望能够对大家的学习有所帮助。