Android学习笔记-简单聊天界面的实现

Posted 2020-08-09

 

之前写过一次，但是莫名其妙的找不到了，今天重新发一次

先来写一个Bean文件，用来存储聊天记录

JavaBean.java

 1 package com.example.androidliaotian;
 2 
 3 public class JavaBean {
 4     private String neirong;
 5     private String time;
 6     public String getNeirong() {
 7         return neirong;
 8     }
 9     public void setNeirong(String neirong) {
10         this.neirong = neirong;
11     }
12     public String getTime() {
13         return time;
14     }
15     public void setTime(String time) {
16         this.time = time;
17     }
18     @Override
19     public String toString() {
20         return "JavaBean [neirong=" + neirong + ", time=" + time + "]";
21     }
22     
23     
24 }

MainActivity.java

 1 package com.example.androidliaotian;
 2 
 3 import java.util.ArrayList;
 4 import java.util.List;
 5 
 6 
 7 
 8 import android.app.Activity;
 9 import android.os.Bundle;
10 import android.util.Log;
11 import android.view.Menu;
12 import android.view.MenuItem;
13 import android.view.View;
14 import android.view.View.OnClickListener;
15 import android.widget.Button;
16 import android.widget.EditText;
17 import android.widget.ListView;
18 
19 public class MainActivity extends Activity {
20     private ListView listview;//列表
21     private EditText neirong;//内容
22     private Button fasong;//按钮
23     private List<JavaBean> list = new ArrayList<JavaBean>();//填充数据的list集合
24     private MainAdapten adapten; //构建数据源
25     @Override
26     protected void onCreate(Bundle savedInstanceState) {
27         setContentView(R.layout.activity_main);
28         super.onCreate(savedInstanceState);
29         
30         listview = (ListView) findViewById(R.id.wo);
31         //构建adapten数据源
32         adapten = new MainAdapten(list, this);
33         listview.setAdapter(adapten);
34         neirong = (EditText) findViewById(R.id.neirong);
35         fasong = (Button) findViewById(R.id.fasong);
36     
37         fasong.setOnClickListener(new OnClickListener() {
38             
39             @Override
40             public void onClick(View v) {
41                 //String text = ;
42                 //实例化Bean文件
43                 JavaBean javaBean = new JavaBean();
44                 //取当前文本内容并利用set方法赋值
45                 javaBean.setNeirong(neirong.getText().toString());
46                 javaBean.setTime(System.currentTimeMillis()+"");
47                 list.add(javaBean);
48                 //更新数据源
49                 adapten.setList(list);
50                 adapten.notifyDataSetChanged();
51                 //列表显示最后一条数据
52                 listview.setSelection(list.size()-1);
53                 //发送完毕之后要让输入框清空
54                  neirong.setText("");
55             }
56         });
57         
58         
59         
60     }
61     
62 }

Adapter的代码

 1 package com.example.androidliaotian;
 2 
 3 import java.util.List;
 4 
 5 
 6 
 7 import android.content.Context;
 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.TextView;
14 
15 public class MainAdapten extends BaseAdapter{
16     private List<JavaBean> list;
17     private Context context;
18     
19     public MainAdapten(List<JavaBean> list,Context context){
20         this.context = context;
21         this.list = list;
22     }
23     
24     public void setList(List<JavaBean> list) {
25         this.list = list;
26         notifyDataSetChanged();
27     }
28 
29     @Override
30     public int getCount() {
31         return list.size();
32     }
33 
34     @Override
35     public Object getItem(int position) {
36         return list.get(position);
37     }
38 
39     @Override
40     public long getItemId(int position) {
41         return position;
42     }
43 
44     @Override
45     public View getView(int position, View convertView, ViewGroup parent) {
46         
47         final Hui hui;
48         if(convertView == null){
49             hui = new Hui();
50             convertView = LayoutInflater.from(context).inflate(R.layout.item_chatqipao, null);
51             hui.chatneirong = (TextView) convertView.findViewById(R.id.tv_chatneirong);
52             hui.chattime = (TextView) convertView.findViewById(R.id.tv_chattime);
53             hui.tou = (ImageView) convertView.findViewById(R.id.iv_chattou);
54         
55             convertView.setTag(hui);
56         }else{
57             hui = (Hui) convertView.getTag();
58         }
59         JavaBean javaBean  = list.get(position);
60         hui.chatneirong.setText("我是"+javaBean.getNeirong());
61         hui.chattime.setText(javaBean.getTime());
62         //javaBean.setTime(javaBean.getTime());
63         
64         return convertView;
65     }
66 
67     class Hui{
68         ImageView tou,tupian;
69         TextView chattime,chatneirong;
70     }
71 }

　　下面是布局界面

activity_main.xml

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     tools:context="${relativePackage}.${activityClass}" >
 6     <!-- 用来显示消息的列表 -->
 7     <ListView android:id="@+id/wo" android:layout_width="match_parent"
 8         android:layout_height="wrap_content"
 9         android:layout_above="@+id/neirong"></ListView>
10     <!-- 用来输入文本的 -->
11     <EditText android:id="@+id/neirong" android:layout_width="match_parent"
12         android:layout_height="wrap_content" android:layout_alignParentBottom="true"
13         android:layout_toLeftOf="@+id/fasong" android:text="少时诵诗书" />
14     <!-- 用于发送的按钮 -->
15     <Button android:id="@+id/fasong" android:layout_width="wrap_content"
16         android:layout_height="wrap_content"  android:text="发送"
17         android:layout_alignParentBottom="true"  
18         android:layout_alignParentRight="true"/>
19 
20 </RelativeLayout>

　　Adapter布局文件 item_chatqipao.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical" >
 6     
 7     <!-- 发送时间 -->
 8     <TextView android:id="@+id/tv_chattime" android:layout_width="wrap_content"
 9         android:layout_height="wrap_content" android:layout_alignParentTop="true"
10         android:layout_centerHorizontal="true" android:layout_marginTop="14dp"
11         android:padding="3dp"
12         android:text="2016年9月13日10:55:58" android:textColor="#FFFFFF"
13         android:textSize="12sp" />
14     
15     <!-- 文字内容 -->
16     <TextView android:id="@+id/tv_chatneirong" android:layout_width="wrap_content"
17         android:layout_height="wrap_content" android:layout_alignTop="@+id/iv_chattou"
18         android:layout_toLeftOf="@+id/iv_chattou" android:background="@drawable/skin_aio_user_bubble_nor"
19         android:gravity="center" android:padding="10dp"
20         android:text="qw速度速度多少e" android:layout_marginTop="10dp"
21          android:textSize="16sp"  android:maxLines="10"
22          android:maxEms="10"
23          />
24 
25     <!-- 头像 -->
26     <ImageView android:id="@+id/iv_chattou" android:layout_width="40dp"
27         android:layout_height="40dp" android:layout_alignParentRight="true"
28         android:layout_below="@+id/tv_chattime" android:layout_marginRight="14dp"
29         android:src="@drawable/ic_launcher" />
30 
31  
32 
33 </RelativeLayout>

 

运行效果

 

附上代码下载地址：链接: http://pan.baidu.com/s/1hrRGOlQ 密码: 32cy