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
1 package com.example.cmm.helloworld;
2
3 import android.app.AlertDialog;
4 import android.content.Context;
5 import android.graphics.drawable.BitmapDrawable;
6 import android.support.v7.app.AppCompatActivity;
7 import android.os.Bundle;
8 import android.view.LayoutInflater;
9 import android.view.View;
10 import android.view.ViewGroup;
11 import android.widget.BaseAdapter;
12 import android.widget.ImageView;
13 import android.widget.ListView;
14 import android.widget.PopupWindow;
15 import android.widget.TextView;
16
17 import java.util.ArrayList;
18 import java.util.List;
19
20 public class MainActivity extends AppCompatActivity {
21
22 private PopupWindow mMorePopupWindow;
23 private int mShowMorePopupWindowWidth;
24 private int mShowMorePopupWindowHeight;
25
26 @Override
27 protected void onCreate(Bundle savedInstanceState) {
28
29 super.onCreate(savedInstanceState);
30
31 setContentView(R.layout.activity_main);
32
33 ListView lv = (ListView) findViewById(R.id.listview);
34
35 lv.setAdapter(new MyAdapter(MainActivity.this, getData()));
36
37 }
38
39 private List<Data> getData() {
40
41 List<Data> data = new ArrayList<>();
42
43 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"));
44 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"));
45 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"));
46 data.add(new Data(R.drawable.yuhong, "永恒依然", "房子车子都到碗里来", "昨天"));
47 data.add(new Data(R.drawable.lanshan, "蓝珊", "你们这群傻×，我笑而不语", "昨天"));
48
49 return data;
50 }
51
52 class MyAdapter extends BaseAdapter {
53 private List<Data> listdata;
54 private Context context;
55
56 public MyAdapter(Context context, List<Data> listdata) {
57 this.context = context;
58 this.listdata = listdata;
59 }
60
61 @Override
62 public int getCount() {
63 return listdata.size();
64 }
65
66 @Override
67 public Object getItem(int arg0) {
68 return listdata.get(arg0);
69 }
70
71 @Override
72 public long getItemId(int arg0) {
73 return arg0;
74 }
75
76 @Override
77 public View getView(int position, View convertView, ViewGroup parent) {
78
79 LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
80 convertView = inflater.inflate(R.layout.listview_item, null, false);
81
82 // 带赋值区域
83 ImageView ivPortrait = (ImageView) convertView.findViewById(R.id.portrait);
84 TextView tvNickName = (TextView) convertView.findViewById(R.id.nick_name);
85 TextView tvContent = (TextView) convertView.findViewById(R.id.content);
86 TextView tvCreatedAt = (TextView) convertView.findViewById(R.id.created_at);
87 ImageView moreBtn = (ImageView) convertView.findViewById(R.id.more_btn);
88
89 // 赋值
90 Data data = listdata.get(position);
91 ivPortrait.setImageResource(data.getPortraitId());
92 tvNickName.setText(data.getNickName());
93 tvContent.setText(data.getContent());
94 tvCreatedAt.setText(data.getCreatedAt());
95
96 // 更多按钮的点击事件
97 moreBtn.setOnClickListener(new View.OnClickListener() {
98 @Override
99 public void onClick(View v) {
100 showMore(v);
101 }
102 });
103
104 return convertView;
105 }
106
107 /**
108 * 弹出点赞和评论框
109 *
110 * @param moreBtnView
111 */
112 private void showMore(View moreBtnView) {
113
114 if (mMorePopupWindow == null) {
115
116 LayoutInflater li = (LayoutInflater) MainActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
117 View content = li.inflate(R.layout.layout_more, null, false);
118
119 mMorePopupWindow = new PopupWindow(content, ViewGroup.LayoutParams.WRAP_CONTENT,
120 ViewGroup.LayoutParams.WRAP_CONTENT);
121 mMorePopupWindow.setBackgroundDrawable(new BitmapDrawable());
122 mMorePopupWindow.setOutsideTouchable(true);
123 mMorePopupWindow.setTouchable(true);
124
125 content.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
126 mShowMorePopupWindowWidth = content.getMeasuredWidth();
127 mShowMorePopupWindowHeight = content.getMeasuredHeight();
128
129 View parent = mMorePopupWindow.getContentView();
130
131 TextView like = (TextView) parent.findViewById(R.id.like);
132 TextView comment = (TextView) parent.findViewById(R.id.comment);
133
134 // 点赞的监听器
135 like.setOnClickListener(new View.OnClickListener() {
136 @Override
137 public void onClick(View v) {
138
139 final AlertDialog.Builder alert = new AlertDialog.Builder(MainActivity.this);
140 alert.setTitle("点赞");
141 alert.setNegativeButton("取消", null);
142 alert.show();
143 }
144 });
145
146 // 评论的监听器
147 comment.setOnClickListener(new View.OnClickListener() {
148 @Override
149 public void onClick(View v) {
150 final AlertDialog.Builder alert = new AlertDialog.Builder(MainActivity.this);
151 alert.setTitle("评论");
152 alert.setNegativeButton("取消", null);
153 alert.show();
154 }
155 });
156 }
157
158 if (mMorePopupWindow.isShowing()) {
159 mMorePopupWindow.dismiss();
160 } else {
161 int heightMoreBtnView = moreBtnView.getHeight();
162
163 mMorePopupWindow.showAsDropDown(moreBtnView, -mShowMorePopupWindowWidth,
164 -(mShowMorePopupWindowHeight + heightMoreBtnView) / 2);
165 }
166 }
167 }
168
169 class Data {
170 private int portraitId; // 头像
171 private String nickName; // 昵称
172 private String content; // 说说
173 private String createdAt; // 发布时间
174
175 public Data(int portraitId, String nickName, String content, String createdAt) {
176 this.portraitId = portraitId;
177 this.nickName = nickName;
178 this.content = content;
179 this.createdAt = createdAt;
180 }
181
182 public int getPortraitId() {
183 return portraitId;
184 }
185
186 public String getNickName() {
187 return nickName;
188 }
189
190 public String getContent() {
191 return content;
192 }
193
194 public String getCreatedAt() {
195 return createdAt;
196 }
197 }
198
199 }
时间： 2024-10-25 18:27:22