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;
    }

    @Override
    public 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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