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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