首先看一下最终的效果，显示了消息时间，用户昵称，用户头像。
大致实现方法：
用最简单的ListView显示消息内容。
不同的用户使用不同的消息布局文件，从而达到头像左右显示的效果，如上图有2个用户"Tony","Hill"，头像分别显示在左右两边。
代码文件清单：
主布局文件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 android:background="#ffffff"
6 tools:context=".MainActivity" >
7 <ListView
8 android:id="@+id/lv_message"
9 android:layout_height="fill_parent"
10 android:layout_width="fill_parent"
11 android:layout_above="@+id/ll_send_1"
12 android:scrollbars="none"
13 android:divider="@null"
14 android:footerDividersEnabled="false">
15 </ListView>
16 <LinearLayout
17 android:id="@+id/ll_send_1"
18 android:layout_height="50dp"
19 android:layout_width="fill_parent"
20 android:orientation="horizontal"
21 android:layout_above="@+id/ll_send_2">
22 <EditText
23 android:id="@+id/et_tony_message"
24 android:layout_width="0dp"
25 android:layout_height="fill_parent"
26 android:layout_weight="3"
27 android:hint="Tony请输入"/>
28 <Button
29 android:id="@+id/but_tony_send"
30 android:layout_height="fill_parent"
31 android:layout_width="0dp"
32 android:layout_weight="1"
33 android:text="send"/>
34 </LinearLayout>
35 <LinearLayout
36 android:id="@+id/ll_send_2"
37 android:layout_height="50dp"
38 android:layout_width="fill_parent"
39 android:orientation="horizontal"
40 android:layout_alignParentBottom="true">
41 <EditText
42 android:id="@+id/et_hill_message"
43 android:layout_width="0dp"
44 android:layout_height="fill_parent"
45 android:layout_weight="3"
46 android:hint="Hill请输入"/>
47 <Button
48 android:id="@+id/but_hill_send"
49 android:layout_height="fill_parent"
50 android:layout_width="0dp"
51 android:layout_weight="1"
52 android:text="send"/>
53 </LinearLayout>
54 </RelativeLayout>View Code
头像位于左边的消息布局文件list_message_item_left.xml：
1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 android:layout_width="fill_parent"
4 android:layout_height="wrap_content"
5 android:orientation="vertical"
6 android:background="@drawable/chat_list_item_background"
7 android:padding="6dp">
8
9 <LinearLayout
10 android:layout_width="fill_parent"
11 android:layout_height="wrap_content"
12 android:orientation="vertical"
13 android:gravity="center_horizontal">
14
15 <TextView
16 android:id="@+id/tv_sendtime"
17 android:layout_width="wrap_content"
18 android:layout_height="wrap_content"
19 android:textColor="#8B8B8B"
20 android:textSize="12sp"
21 android:text="15:03:15"/>
22 </LinearLayout>
23
24
25 <RelativeLayout
26 android:layout_width="fill_parent"
27 android:layout_height="wrap_content">
28
29 <ImageView
30 android:id="@+id/iv_userhead"
31 android:layout_width="40dp"
32 android:layout_height="40dp"
33 android:background="@drawable/head_portrait_1"
34 android:focusable="false"
35 android:layout_alignParentLeft="true"
36 android:layout_alignParentTop="true" />
37
38 <TextView
39 android:id="@+id/tv_username"
40 android:layout_width="wrap_content"
41 android:layout_height="wrap_content"
42 android:layout_marginLeft="10dp"
43 android:layout_marginBottom="5dp"
44 android:textColor="#8B8B8B"
45 android:layout_toRightOf="@id/iv_userhead"
46 android:text="name"/>
47
48 <TextView
49 android:id="@+id/tv_chatcontent"
50 android:layout_toRightOf="@id/iv_userhead"
51 android:layout_marginLeft="10dp"
52 android:layout_marginRight="40dp"
53 android:layout_below="@id/tv_username"
54 android:layout_width="wrap_content"
55 android:layout_height="wrap_content"
56 android:text=""
57 android:background="@drawable/message_text_background01"/>
58 </RelativeLayout>
59 </LinearLayout>View Code
头像位于右边的消息布局文件list_message_item_right.xml：
1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 android:layout_width="fill_parent"
4 android:layout_height="wrap_content"
5 android:orientation="vertical"
6 android:background="@drawable/chat_list_item_background"
7 android:padding="6dp">
8
9 <LinearLayout
10 android:layout_width="fill_parent"
11 android:layout_height="wrap_content"
12 android:orientation="vertical"
13 android:gravity="center_horizontal">
14
15 <TextView
16 android:id="@+id/tv_sendtime"
17 android:layout_width="wrap_content"
18 android:layout_height="wrap_content"
19 android:textColor="#8B8B8B"
20 android:textSize="12sp"
21 android:text="15:03:15"/>
22 </LinearLayout>
23 <RelativeLayout
24 android:layout_width="fill_parent"
25 android:layout_height="wrap_content"
26 android:layout_marginTop="5dp" >
27
28 <ImageView
29 android:id="@+id/iv_userhead"
30 android:layout_width="40dp"
31 android:layout_height="40dp"
32 android:background="@drawable/head_portrait_2"
33 android:focusable="false"
34 android:layout_alignParentRight="true"
35 android:layout_alignParentTop="true" />
36
37 <TextView
38 android:id="@+id/tv_username"
39 android:layout_width="wrap_content"
40 android:layout_height="wrap_content"
41 android:layout_marginRight="10dp"
42 android:layout_marginBottom="5dp"
43 android:textColor="#8B8B8B"
44 android:layout_toLeftOf="@id/iv_userhead"
45 android:text="name"/>
46
47 <TextView
48 android:id="@+id/tv_chatcontent"
49 android:layout_toLeftOf="@id/iv_userhead"
50 android:layout_marginRight="10dp"
51 android:layout_marginLeft="40dp"
52 android:layout_below="@id/tv_username"
53 android:layout_width="wrap_content"
54 android:layout_height="wrap_content"
55 android:text=""
56 android:background="@drawable/message_text_background02"/>
57 </RelativeLayout>
58
59 </LinearLayout>View Code
主界面java代码文件MainActivity.java:
1 public class MainActivity extends Activity implements OnClickListener{
2 EditText et_tony_message;
3 Button but_tony_send;
4
5 EditText et_hill_message;
6 Button but_hill_send;
7
8 ListView lv_message;
9 List<Message> list;
10 MessageAdapter adapter;
11 Handler handler=new Handler();
12 @Override
13 protected void onCreate(Bundle savedInstanceState) {
14 super.onCreate(savedInstanceState);
15 setContentView(R.layout.activity_main);
16 init();
17 }
18
19 private void init() {
20 et_tony_message=(EditText) findViewById(R.id.et_tony_message);
21 but_tony_send=(Button) findViewById(R.id.but_tony_send);
22 but_tony_send.setOnClickListener(this);
23
24 et_hill_message=(EditText) findViewById(R.id.et_hill_message);
25 but_hill_send=(Button) findViewById(R.id.but_hill_send);
26 but_hill_send.setOnClickListener(this);
27
28 list=new ArrayList<Message>();
29 lv_message=(ListView) findViewById(R.id.lv_message);
30 adapter=new MessageAdapter();
31 lv_message.setAdapter(adapter);
32 }
33
34
35 @Override
36 public void onClick(View v) {
37 /*Tony发送消息*/
38 if(v==but_tony_send){
39 /*验证*/
40 if(et_tony_message.getText()==null||et_tony_message.getText().toString().equals("")){
41 Toast.makeText(this, "消息不能为空", 0).show();
42 return ;
43 }
44 Message m=new Message();
45 m.setFrom_username("Tony");
46 m.setCreate_time(System.currentTimeMillis());
47 m.setText(et_tony_message.getText().toString());
48 sendMessage(m);
49 et_tony_message.setText("");
50 }
51 /*Hill发送消息*/
52 if(v==but_hill_send){
53 /*验证*/
54 if(et_hill_message.getText()==null||et_hill_message.getText().toString().equals("")){
55 Toast.makeText(this, "消息不能为空", 0).show();
56 return ;
57 }
58 Message m=new Message();
59 m.setFrom_username("Hill");
60 m.setCreate_time(System.currentTimeMillis());
61 m.setText(et_hill_message.getText().toString());
62 sendMessage(m);
63 et_hill_message.setText("");
64 }
65 }
66 private void sendMessage(Message m) {
67 list.add(m);
68 adapter.notifyDataSetChanged();
69 // lv_message.f
70 lv_message.setSelection(list.size()+1);
71 }
72 class MessageAdapter extends BaseAdapter{
73
74 @Override
75 public int getCount() {
76 return list.size();
77 }
78
79 @Override
80 public Object getItem(int position) {
81 return list.get(position);
82 }
83
84 @Override
85 public long getItemId(int position) {
86 return 0;
87 }
88
89 @Override
90 public View getView(int position, View convertView, ViewGroup parent) {
91 Message message=list.get(position);
92 ViewHolder viewHolder=null;
93 // if(convertView==null){
94 if("Tony".equalsIgnoreCase(message.getFrom_username())){
95 convertView=parent.inflate(MainActivity.this, R.layout.list_message_item_left, null);
96 }else{
97 convertView=parent.inflate(MainActivity.this, R.layout.list_message_item_right, null);
98 }
99 viewHolder=new ViewHolder();
100 viewHolder.iv_userhead=(ImageView) convertView.findViewById(R.id.iv_userhead);
101 viewHolder.tv_chatcontent=(TextView) convertView.findViewById(R.id.tv_chatcontent);
102 viewHolder.tv_sendtime=(TextView) convertView.findViewById(R.id.tv_sendtime);
103 viewHolder.tv_username=(TextView) convertView.findViewById(R.id.tv_username);
104 // convertView.setTag(viewHolder);
105 // }else{
106 // viewHolder=(ViewHolder) convertView.getTag();
107 // }
108
109 viewHolder.tv_chatcontent.setText(message.getText());
110 viewHolder.tv_sendtime.setText(new SimpleDateFormat("HH:mm:ss").format(new Date(message.getCreate_time())));
111 viewHolder.tv_username.setText(message.getFrom_username());
112 return convertView;
113 }
114 class ViewHolder{
115 public ImageView iv_userhead;
116 public TextView tv_username;
117 public TextView tv_chatcontent;
118 public TextView tv_sendtime;
119 }
120 }
121 }View Code
消息封装代码文件Message.java:
1 public class Message {
2 private String from_username;/*发送者*/
3 private Long create_time;/*发送时间*/
4 private String text;/*消息内容*/
5 public String getFrom_username() {
6 return from_username;
7 }
8
9 public Long getCreate_time() {
10 return create_time;
11 }
12 public void setCreate_time(Long create_time) {
13 this.create_time = create_time;
14 }
15 public String getText() {
16 return text;
17 }
18 public void setText(String text) {
19 this.text = text;
20 }
21
22 public void setFrom_username(String from_username) {
23 this.from_username = from_username;
24 }
25
26 }View Code
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