Chat 聊天界面

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MainActivity.java

package com.example.chat;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.view.Window;import android.widget.Button;import android.widget.EditText;import android.widget.ListView;public class MainActivity extends Activity {private ListView msgListView;private EditText inputText;private Button send;private MsgAdapter adapter;private List<Msg> msgList = new ArrayList<Msg>();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_main);initMsgs(); // 初始化消息数据adapter = new MsgAdapter(MainActivity.this, R.layout.msg_item, msgList);inputText = (EditText) findViewById(R.id.input_text);send = (Button) findViewById(R.id.send);msgListView = (ListView) findViewById(R.id.msg_list_view);msgListView.setAdapter(adapter); send.setOnClickListener(new OnClickListener(){public void onClick(View v) {String content = inputText.getText().toString();if (!"".equals(content)) {Msg msg = new Msg(content, Msg.TYPE_SENT);msgList.add(msg);adapter.notifyDataSetChanged(); // 当有新消息时，刷新ListView中的显示msgListView.setSelection(msgList.size()); // 将ListView定位到最后一行inputText.setText(""); // 清空输入框中的内容}}});}private void initMsgs() {Msg msg1 = new Msg("Hello guy.", Msg.TYPE_RECEIVED);msgList.add(msg1);Msg msg2 = new Msg("Hello. Who is that?", Msg.TYPE_SENT);msgList.add(msg2);Msg msg3 = new Msg("This is Tom. Nice talking to you. ", Msg.TYPE_RECEIVED);msgList.add(msg3);}}

Msg.java

package com.example.chat;public class Msg {public static final int TYPE_RECEIVED = 0;public static final int TYPE_SENT = 1;private String content;private int type;public Msg(String content, int type) {this.content = content;this.type = type;}public String getContent() {return content;}public int getType() {return type;}}

MsgAdapter.java

package com.example.chat;import java.util.List;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ArrayAdapter;import android.widget.LinearLayout;import android.widget.TextView;public class MsgAdapter extends ArrayAdapter<Msg> {private int resourceId;public MsgAdapter(Context context, int textViewResourceId, List<Msg> objects) {super(context, textViewResourceId, objects);resourceId = textViewResourceId;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {Msg msg = getItem(position);View view;ViewHolder viewHolder;if (convertView == null) {view = LayoutInflater.from(getContext()).inflate(resourceId, null);viewHolder = new ViewHolder();viewHolder.leftLayout = (LinearLayout) view.findViewById (R.id.left_layout);viewHolder.rightLayout = (LinearLayout) view.findViewById (R.id.right_layout);viewHolder.leftMsg = (TextView) view.findViewById(R.id.left_msg);viewHolder.rightMsg = (TextView) view.findViewById(R.id.right_msg);view.setTag(viewHolder);} else {view = convertView;viewHolder = (ViewHolder) view.getTag();}if (msg.getType() == Msg.TYPE_RECEIVED) {// 如果是收到的消息，则显示左边的消息布局，将右边的消息布局隐藏viewHolder.leftLayout.setVisibility(View.VISIBLE);viewHolder.rightLayout.setVisibility(View.GONE);viewHolder.leftMsg.setText(msg.getContent());} else if(msg.getType() == Msg.TYPE_SENT) {// 如果是发出的消息，则显示右边的消息布局，将左边的消息布局隐藏viewHolder.rightLayout.setVisibility(View.VISIBLE);viewHolder.leftLayout.setVisibility(View.GONE);viewHolder.rightMsg.setText(msg.getContent());}return view;}class ViewHolder {LinearLayout leftLayout;LinearLayout rightLayout;TextView leftMsg;TextView rightMsg;}}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#d8e0e8"    android:orientation="vertical" >    <ListView        android:id="@+id/msg_list_view"        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1"        android:divider="#0000" >    </ListView>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content" >        <EditText            android:id="@+id/input_text"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"            android:hint="Type somthing here"            android:maxLines="2" />        <Button            android:id="@+id/send"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="Send" />            </LinearLayout></LinearLayout>


msg_item.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    android:padding="10dp" >    <LinearLayout        android:id="@+id/left_layout"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="left"        android:background="@drawable/message_left" >        <TextView            android:id="@+id/left_msg"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_gravity="center"            android:layout_margin="10dp"            android:textColor="#fff" />    </LinearLayout>    <LinearLayout        android:id="@+id/right_layout"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="right"        android:background="@drawable/message_right" >        <TextView            android:id="@+id/right_msg"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_gravity="center"            android:layout_margin="10dp" />    </LinearLayout></LinearLayout>

AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.chat"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="18" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name="com.example.chat.MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>


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