Android自定义组件ListPopWindow

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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。

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