Android中使用PopupWindow 仿微信点赞和评论弹出

微信朋友圈的点赞和评论功能，有2个组成部分：左下角的“更多”按钮；点击该按钮后弹出的对话框；

PopupWindow，弹出框使用PopupWindow实现，这是点赞和评论的载体，具体要涉及 PopupWindow 点击非窗口位置和再次点击消失以及显示位置的问题（根据相应更多按钮的位置确定 PopupWindow 的显示位置

package com.example.cmm.helloworld;import Android.app.AlertDialog;import android.content.Context;import android.graphics.drawable.BitmapDrawable;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.ListView;import android.widget.PopupWindow;import android.widget.TextView;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity { private PopupWindow mMorePopupWindow; private int mShowMorePopupWindowWidth; private int mShowMorePopupWindowHeight; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  ListView lv = (ListView) findViewById(R.id.listview);  lv.setAdapter(new MyAdapter(MainActivity.this, getData())); } private List<Data> getData() {  List<Data> data = new ArrayList<>();  data.add(new Data(R.drawable.xiaona, "薄荷栗", "我学过跆拳道，都给我跪下唱征服", "昨天"));  data.add(new Data(R.drawable.xueyan, "欣然", "走遍天涯海角，唯有我家风景最好，啊哈哈", "昨天"));  data.add(new Data(R.drawable.leishao, "陈磊_CL", "老子以后要当行长的，都来找我借钱吧，now", "昨天"));  data.add(new Data(R.drawable.yuhong, "永恒依然", "房子车子都到碗里来", "昨天"));  data.add(new Data(R.drawable.lanshan, "蓝珊", "你们这群傻×，我笑而不语", "昨天"));  return data; } class MyAdapter extends BaseAdapter {  private List<Data> listdata;  private Context context;  public MyAdapter(Context context, List<Data> listdata) {   this.context = context;   this.listdata = listdata;  }  @Override  public int getCount() {   return listdata.size();  }  @Override  public Object getItem(int arg0) {   return listdata.get(arg0);  }  @Override  public long getItemId(int arg0) {   return arg0;  }  @Override  public View getView(int position, View convertView, ViewGroup parent) {   LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);   convertView = inflater.inflate(R.layout.listview_item, null, false);   // 带赋值区域   ImageView ivPortrait = (ImageView) convertView.findViewById(R.id.portrait);   TextView tvNickName = (TextView) convertView.findViewById(R.id.nick_name);   TextView tvContent = (TextView) convertView.findViewById(R.id.content);   TextView tvCreatedAt = (TextView) convertView.findViewById(R.id.created_at);   ImageView moreBtn = (ImageView) convertView.findViewById(R.id.more_btn);   // 赋值   Data data = listdata.get(position);   ivPortrait.setImageResource(data.getPortraitId());   tvNickName.setText(data.getNickName());   tvContent.setText(data.getContent());   tvCreatedAt.setText(data.getCreatedAt());   // 更多按钮的点击事件   moreBtn.setOnClickListener(new View.OnClickListener() {    @Override    public void onClick(View v) {     showMore(v);    }   });   return convertView;  }    private void showMore(View moreBtnView) {   if (mMorePopupWindow == null) {    LayoutInflater li = (LayoutInflater) MainActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);    View content = li.inflate(R.layout.layout_more, null, false);    mMorePopupWindow = new PopupWindow(content, ViewGroup.LayoutParams.WRAP_CONTENT,      ViewGroup.LayoutParams.WRAP_CONTENT);    mMorePopupWindow.setBackgroundDrawable(new BitmapDrawable());    mMorePopupWindow.setOutsideTouchable(true);    mMorePopupWindow.setTouchable(true);    content.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);    mShowMorePopupWindowWidth = content.getMeasuredWidth();    mShowMorePopupWindowHeight = content.getMeasuredHeight();    View parent = mMorePopupWindow.getContentView();    TextView like = (TextView) parent.findViewById(R.id.like);    TextView comment = (TextView) parent.findViewById(R.id.comment);    // 点赞的监听器    like.setOnClickListener(new View.OnClickListener() {     @Override     public void onClick(View v) {      final AlertDialog.Builder alert = new AlertDialog.Builder(MainActivity.this);      alert.setTitle("点赞");      alert.setNegativeButton("取消", null);      alert.show();     }    });    // 评论的监听器    comment.setOnClickListener(new View.OnClickListener() {     @Override     public void onClick(View v) {      final AlertDialog.Builder alert = new AlertDialog.Builder(MainActivity.this);      alert.setTitle("评论");      alert.setNegativeButton("取消", null);      alert.show();     }    });   }   if (mMorePopupWindow.isshowing()) {    mMorePopupWindow.dismiss();   } else {    int heightMoreBtnView = moreBtnView.getHeight();    mMorePopupWindow.showAsDropDown(moreBtnView, -mShowMorePopupWindowWidth,      -(mShowMorePopupWindowHeight + heightMoreBtnView) / 2);   }  } } class Data {  private int portraitId; // 头像  private String nickName; // 昵称  private String content; // 说说  private String createdAt; // 发布时间  public Data(int portraitId, String nickName, String content, String createdAt) {   this.portraitId = portraitId;   this.nickName = nickName;   this.content = content;   this.createdAt = createdAt;  }  public int getPortraitId() {   return portraitId;  }  public String getNickName() {   return nickName;  }  public String getContent() {   return content;  }  public String getCreatedAt() {   return createdAt;  } }}