UI设计之--仿微信聊天界面

1.首先编写main.xml文件：

<?xml version="1.0" encoding="utf-8"?><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="45dp"        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="45dp"        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>

2.然后来定义一个消息实体类Msg:

package org.lxh.demo;public class Msg {public static final int TYPE_RECEIVED = 1;public static final int TYPE_SENT = 0;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;}}

3.新建msg_item.xml代码：

<?xml version="1.0" encoding="utf-8"?><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="45dp"        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="45dp"        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>

4.新建MsgAdapter继承自ArrayAdapter:

package org.lxh.demo;import java.util.List;import android.R.integer;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) {// 判断消息类型，决定哪边显示viewHolder.leftLayout.setVisibility(View.VISIBLE);viewHolder.rightLayout.setVisibility(View.GONE);viewHolder.leftMsg.setText(msg.getContent());} else if (msg.getType() == Msg.TYPE_SENT) {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;}}

5.MainActivity:

package org.lxh.demo;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.app.AlertDialog;import android.app.Dialog;import android.content.DialogInterface;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.view.View.OnFocusChangeListener;import android.view.Window;import android.widget.Button;import android.widget.EditText;import android.widget.ListView;import android.widget.TextView;public class Hello extends Activity {private ListView msgListView;private EditText inputText;private Button send;private MsgAdapter adapter;private List<Msg> msgList=new ArrayList<Msg>();public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState); // 生命周期方法requestWindowFeature(Window.FEATURE_NO_TITLE);super.setContentView(R.layout.main); // 设置要使用的布局管理器initMsg();adapter=new MsgAdapter(Hello.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();//当有县消息时刷新ListView中的显示msgListView.setSelection(msgList.size());//将ListView定位到最后一行inputText.setText("");}}});}private void initMsg() {Msg msg1=new Msg("Hi Peter", Msg.TYPE_RECEIVED);msgList.add(msg1);Msg msg2=new Msg("Hello Dog", Msg.TYPE_SENT);msgList.add(msg2);Msg msg3=new Msg("How are you?", Msg.TYPE_RECEIVED);msgList.add(msg3);}}

运行实例如下：

源码下载地址：http://download.csdn.net/detail/yayun0516/8736781

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