Detailed explanation of Android high imitation WeChat chat interface examples

package com.way.demo; 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; /** * @author way */ public class WeixinChatDemoActivity extends Activity implements OnClickListener { private Button mBtnSend;// 发送btn private Button mBtnBack;// 返回btn private EditText mEditTextContent; private ListView mListView; private ChatMsgViewAdapter mAdapter;// 消息视图的Adapter private List mDataArrays = new ArrayList();// 消息对象数组 public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); initView();// 初始化view initData();// 初始化数据 mListView.setSelection(mAdapter.getCount() - 1); } /** * 初始化view */ public void initView() { mListView = (ListView) findViewById(R.id.listview); mBtnSend = (Button) findViewById(R.id.btn_send); mBtnSend.setOnClickListener(this); mBtnBack = (Button) findViewById(R.id.btn_back); mBtnBack.setOnClickListener(this); mEditTextContent = (EditText) findViewById(R.id.et_sendmessage); } private String[] msgArray = new String[] { "有大吗", "有！你呢？", "我也有", "那上吧", "打啊！你放大啊！", "你TM咋不放大呢？留大抢人头啊？CAO！你个菜B", "2B不解释", "尼滚...", "今晚去网吧包夜吧？", "有毛片吗？", "种子一大堆啊~还怕没片？", "OK,搞起！！" }; private String[] dataArray = new String[] { "2012-09-22 18:00:02", "2012-09-22 18:10:22", "2012-09-22 18:11:24", "2012-09-22 18:20:23", "2012-09-22 18:30:31", "2012-09-22 18:35:37", "2012-09-22 18:40:13", "2012-09-22 18:50:26", "2012-09-22 18:52:57", "2012-09-22 18:55:11", "2012-09-22 18:56:45", "2012-09-22 18:57:33", }; private final static int COUNT = 12;// 初始化数组总数 /** * 模拟加载消息历史，实际开发可以从数据库中读出 */ public void initData() { for (int i = 0; i 0) { ChatMsgEntity entity = new ChatMsgEntity(); entity.setName("必败"); 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()); } }

package com.way.demo; 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 * * @author way */ public class ChatMsgViewAdapter extends BaseAdapter { public static interface IMsgViewType { int IMVT_COM_MSG = 0;// 收到对方的消息 int IMVT_TO_MSG = 1;// 自己发送出去的消息 } private static final int ITEMCOUNT = 2;// 消息类型的总数 private List coll;// 消息对象数组 private LayoutInflater mInflater; public ChatMsgViewAdapter(Context context, List coll) { this.coll = coll; mInflater = LayoutInflater.from(context); } public int getCount() { return coll.size(); } public Object getItem(int position) { return coll.get(position); } public long getItemId(int position) { return position; } /** * 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) { ChatMsgEntity entity = coll.get(position); if (entity.getMsgType()) {//收到的消息 return IMsgViewType.IMVT_COM_MSG; } else {//自己发送的消息 return IMsgViewType.IMVT_TO_MSG; } } /** * Item类型的总数 */ public int getViewTypeCount() { return ITEMCOUNT; } 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.chatting_item_msg_text_left, null); } else { convertView = mInflater.inflate( R.layout.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; } }

package com.way.demo; /** * 一个消息的JavaBean * * @author way * */ 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; } }