相似微信的ChattingUi

先看主页面布局

activity_imitate_weixin_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#f0f0e0" >


    <RelativeLayout
        android:id="@+id/rl_bottom"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:background="@drawable/weixin_layout_bg1" >

        <Button
            android:id="@+id/btn_send"
            android:layout_width="60dp"
            android:layout_height="40dp"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:layout_marginRight="10dp"
            android:text="发送" />

        <EditText
            android:id="@+id/et_sendmessage"
            android:layout_width="fill_parent"
            android:layout_height="40dp"
            android:layout_centerVertical="true"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            android:layout_toLeftOf="@id/btn_send"
            android:background="@drawable/weixin_edittext1"
            android:singleLine="true"
            android:textSize="18sp" />
    </RelativeLayout>

    <ListView
        android:id="@+id/listview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_above="@id/rl_bottom"
        android:layout_marginLeft="10.0dip"
        android:layout_marginRight="10.0dip"
        android:layout_marginTop="10.0dip"
        android:cacheColorHint="#00000000"
        android:divider="@null"
        android:dividerHeight="5dp"
        android:scrollbars="none" />

</RelativeLayout>

再看入口WeixinChatDemoActivity

package com.example.weixindemo;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
/**
 * 仿微信主页面
 */
public class WeixinChatDemoActivity extends Activity implements OnClickListener {

	private Button mBtnSend;// 发送btn
	private EditText mEditTextContent;
	private ListView mListView;
	private ChatMsgViewAdapter mAdapter;// 消息视图的Adapter
	private List<ChatMsgEntity> mDataArrays = new ArrayList<ChatMsgEntity>();// 消息对象数组

	private final static int COUNT = 1;// 初始化数组总数

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_imitate_weixin_main);
		initView();
	}
	
	public void initView() {
		mListView = (ListView) findViewById(R.id.listview);
		mBtnSend = (Button) findViewById(R.id.btn_send);
		mEditTextContent = (EditText) findViewById(R.id.et_sendmessage);
		initData();// 初始化数据
		
		mBtnSend.setOnClickListener(this);
		mListView.setSelection(mAdapter.getCount() - 1);
	}

	
	/**
	 * 模拟载入消息历史，实际开发能够从数据库中读出
	 */
	public void initData() {
		for (int i = 0; i < COUNT; i++) {
			ChatMsgEntity entity = new ChatMsgEntity();
			entity.setDate("2012-09-22 18:00:02");
			if (i % 2 == 0) {
				entity.setName("他人");
				entity.setMsgType(true);// 收到的消息
			} else {
				entity.setName("本人");
				entity.setMsgType(false);// 自己发送的消息
			}
			entity.setMessage("今晚去网吧包夜吧？");
			mDataArrays.add(entity);
		}

		mAdapter = new ChatMsgViewAdapter(this, mDataArrays);
		mListView.setAdapter(mAdapter);
	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.btn_send:// 发送button点击事件
			send();
			break;
		}
	}

	/**
	 * 发送消息
	 */
	private void send() {
		String contString = mEditTextContent.getText().toString();
		if (contString.length() > 0) {
			ChatMsgEntity entity = new ChatMsgEntity();
			entity.setName("本人");
			entity.setDate(getDate());
			entity.setMessage(contString);
			entity.setMsgType(false);

			mDataArrays.add(entity);
			mAdapter.notifyDataSetChanged();// 通知ListView，数据已发生改变

			mEditTextContent.setText("");// 清空编辑框数据

			mListView.setSelection(mListView.getCount() - 1);// 发送一条消息时，ListView显示选择最后一项
		}
	}

	/**
	 * 发送消息时，获取当前事件
	 * 
	 * @return 当前时间
	 */
	private String getDate() {
		SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
		return format.format(new Date());
	}

	
}

再看适配器

ChatMsgViewAdapter

package com.example.weixindemo;
import java.util.List;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
/**
 * 消息ListView的Adapter
 */
public class ChatMsgViewAdapter extends BaseAdapter {

	private List<ChatMsgEntity> coll;// 消息对象数组
	private LayoutInflater mInflater;

	public ChatMsgViewAdapter(Context context, List<ChatMsgEntity> coll) {
		this.coll = coll;
		mInflater = LayoutInflater.from(context);
	}

	/*****************************************************/
	//得到Item的类型。是对方发过来的消息，还是自己发送出去的
	public int getItemViewType(int position) {
		return coll.get(position).getMsgType()?1:0;
	}
	//Item类型的总数
	public int getViewTypeCount() {
		return 2;
	}
	/******************************************************/
	public int getCount() {
		return coll.size();
	}

	public Object getItem(int position) {
		return coll.get(position);
	}

	public long getItemId(int position) {
		return position;
	}


	public View getView(int position, View convertView, ViewGroup parent) {

		ChatMsgEntity entity = coll.get(position);
		boolean isComMsg = entity.getMsgType();

		ViewHolder viewHolder = null;
		if (convertView == null) {
			if (isComMsg) {
				convertView = mInflater.inflate(
						R.layout.activity_imitate_weixin_chatting_item_msg_text_left, null);
			} else {
				convertView = mInflater.inflate(
						R.layout.activity_imitate_weixin_chatting_item_msg_text_right, null);
			}

			viewHolder = new ViewHolder();
			viewHolder.tvSendTime = (TextView) convertView
					.findViewById(R.id.tv_sendtime);
			viewHolder.tvUserName = (TextView) convertView
					.findViewById(R.id.tv_username);
			viewHolder.tvContent = (TextView) convertView
					.findViewById(R.id.tv_chatcontent);
			viewHolder.isComMsg = isComMsg;

			convertView.setTag(viewHolder);
		} else {
			viewHolder = (ViewHolder) convertView.getTag();
		}
		viewHolder.tvSendTime.setText(entity.getDate());
		viewHolder.tvUserName.setText(entity.getName());
		viewHolder.tvContent.setText(entity.getMessage());
		return convertView;
	}

	static class ViewHolder {
		public TextView tvSendTime;
		public TextView tvUserName;
		public TextView tvContent;
		public boolean isComMsg = true;
	}

}

另外还辅助的bean类

ChatMsgEntity

package com.example.weixindemo;

/**
 * 一个消息的JavaBean
 */
public class ChatMsgEntity {
	private String name;//消息来自
	private String date;//消息日期
	private String message;//消息内容
	private boolean isComMeg = true;// 是否为收到的消息

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getDate() {
		return date;
	}

	public void setDate(String date) {
		this.date = date;
	}

	public String getMessage() {
		return message;
	}

	public void setMessage(String message) {
		this.message = message;
	}

	public boolean getMsgType() {
		return isComMeg;
	}

	public void setMsgType(boolean isComMsg) {
		isComMeg = isComMsg;
	}

	public ChatMsgEntity() {
	}

	public ChatMsgEntity(String name, String date, String text, boolean isComMsg) {
		super();
		this.name = name;
		this.date = date;
		this.message = text;
		this.isComMeg = isComMsg;
	}

}

另外还有聊天界面本人、他人的布局文件

activity_imitate_weixin_chatting_item_msg_text_left.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="6dp" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/tv_sendtime"
            style="@style/chat_text_date_style"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </LinearLayout>

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp" >

        <ImageView
            android:id="@+id/iv_userhead"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true"
            android:background="@drawable/weixin_mini_avatar_shadow"
            android:focusable="false" />

        <TextView
            android:id="@+id/tv_chatcontent"
            style="@style/chat_content_date_style"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_toRightOf="@id/iv_userhead"
            android:background="@drawable/weixin_chatfrom_bg_normal" />

        <TextView
            android:id="@+id/tv_username"
            style="@style/chat_text_name_style"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_below="@id/iv_userhead"
            android:layout_toLeftOf="@id/tv_chatcontent" />
    </RelativeLayout>

</LinearLayout>

activity_imitate_weixin_chatting_item_msg_text_right.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="6dp" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/tv_sendtime"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#bfbfbf"
            android:padding="2dp"
            android:textColor="#ffffff"
            android:textSize="12sp" />
    </LinearLayout>

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp" >

        <ImageView
            android:id="@+id/iv_userhead"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_alignParentTop="true"
            android:background="@drawable/weixin_mini_avatar_shadow"
            android:focusable="false" />

        <TextView
            android:id="@+id/tv_chatcontent"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginRight="10dp"
            android:layout_toLeftOf="@id/iv_userhead"
            android:background="@drawable/weixin_chatto_bg_normal"
            android:clickable="true"
            android:focusable="true"
            android:gravity="left|center"
            android:lineSpacingExtra="2dp"
            android:minHeight="50dp"
            android:textColor="#ff000000"
            android:textSize="15sp" />

        <TextView
            android:id="@+id/tv_username"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_below="@id/iv_userhead"
            android:layout_toRightOf="@id/tv_chatcontent"
            android:gravity="center"
            android:textColor="#818181"
            android:textSize="15sp" />
    </RelativeLayout>

</LinearLayout>