三十二：基于XMPP聊天会议室（2）

客官°小女子只卖身不卖艺 2022-08-11 03:22 130阅读 0赞

上一篇已经得到了所有创建的房间，今天就进入房间聊两句，不过要先看一下smack文档的MultiUserChat类（多用户聊天），官方文档是这么说的：

A MultiUserChat is a conversation that takes place among many users in a virtual room. A room could have many occupants with different affiliation and roles. Possible affiliatons are "owner", "admin", "member", and "outcast". Possible roles are "moderator", "participant", and "visitor". Each role and affiliation guarantees different privileges (e.g. Send messages to all occupants, Kick participants and visitors, Grant voice, Edit member list, etc.).

我大致翻译一下：

MultiUserChat是在一个虚拟的房间里发生在很多用户之间的交流，一个房间可能有很多不同归属和角色的群体，可能归属是“所有者”，”管理员“，”成员“，”被踢的人“。可能角色是”主持人“，”参与者“，”访客“。每个角色和归属保证不同的特权（例如.发送消息给所有人，踢参与者和游客，授予说话权限，编辑成员列表，等等）。

1、文档里有一个构造方法和很多其他的方法，我就不说了，有空可以看一下，由于时间关系，直接进入代码：

2、先看xml文件，activity\_roomchat.xml，一个ListView，editText，Button没什么说的。

3、RoomChatActivity.java代码，是主要代码，可以看一下Smack文档和我的注释，其实和单聊的监听差不多。在创建房间的时候如果你写了密码，那么我这里弹出一个dialog，去输入密码，成功就进入。这里我就判断了一下401错误，其实还有很多，像402,403,404等等，有空你们可以研究一下都是什么错误，这里我就不说了。

package org.hkby.lwx.activity;
    
    import java.util.ArrayList;
    import java.util.List;
    
    import org.hkby.lwx.adapter.RoomChatAdapter;
    import org.hkby.lwx.common.RoomMsg;
    import org.hkby.lwx.common.SystemTime;
    import org.hkby.lwx.common.XmppTool;
    import org.jivesoftware.smack.PacketListener;
    import org.jivesoftware.smack.XMPPException;
    import org.jivesoftware.smack.packet.Message;
    import org.jivesoftware.smack.packet.Packet;
    import org.jivesoftware.smackx.muc.MultiUserChat;
    
    import android.app.Activity;
    import android.app.AlertDialog;
    import android.content.SharedPreferences;
    import android.os.Bundle;
    import android.os.Handler;
    import android.util.Log;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.ListView;
    import android.widget.Toast;
    /**
     * room chat
     * @author liaowuxing
     *
     */
    public class RoomChatActivity extends Activity {
    	private MultiUserChat muc;
    	private EditText et_sendRoomMsg;
    	private Button btn_send;
    	private String jid;
    
    	private ListView lv_roomMsg;
    	private List<RoomMsg> listMsg = new ArrayList<RoomMsg>();
    	private RoomChatAdapter adapter;
    	private String loginUser;
    	
    	private AlertDialog dialog;
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.activity_roomchat);
    		getData();
    		initView();
    		initClick();
    	}
    
    	private void getData(){
    		//get JID
    		jid = getIntent().getStringExtra("jid");
    		// instantiate MultiUserChat
    		muc = new MultiUserChat(XmppTool.getConnection(), jid);
    		//get login username
    		SharedPreferences sp = getSharedPreferences("username",Activity.MODE_PRIVATE);
    		loginUser = sp.getString("account", "");
    		try {
    			// Join a chat room
    			muc.join(loginUser);
    			Log.v("---TAG", "join success");
    		} catch (XMPPException e) {
    			e.printStackTrace();
    			int code = e.getXMPPError().getCode();
    			if (code == 401) {
    				//if code is 401,Need a password
    				showDialog(loginUser, muc);
    			}else {
    				finish();
    			}
    		}
    	}
    	public void initView() {
    		lv_roomMsg = (ListView) this.findViewById(R.id.lv_roomMsg);
    		et_sendRoomMsg = (EditText) this.findViewById(R.id.et_sendRoomMsg);
    		btn_send = (Button) this.findViewById(R.id.btn_sendRoomMsg);
    		adapter = new RoomChatAdapter(RoomChatActivity.this, listMsg);
    		lv_roomMsg.setAdapter(adapter);
    	}
    
    	public void initClick() {
    		// Listen to the message
    		muc.addMessageListener(new PacketListener() {
    			@Override
    			public void processPacket(Packet packet) {
    				Message message = (Message) packet;
    				Log.v("---MSG", "--from:" + message.getFrom() + "--body:" + message.getBody());
    				android.os.Message m = handler.obtainMessage();
    				m.obj = message;
    				m.sendToTarget();
    			}
    		});
    		// send message
    		btn_send.setOnClickListener(new OnClickListener() {
    
    			@Override
    			public void onClick(View v) {
    				String roomMsg = et_sendRoomMsg.getText().toString();
    				try {
    					if (roomMsg == "" || roomMsg.length() == 0) {
    						Toast.makeText(RoomChatActivity.this, R.string.roomMsgIsEmpty, Toast.LENGTH_SHORT).show();
    					}else {
    						muc.sendMessage(roomMsg);
    					}
    				} catch (XMPPException e) {
    					e.printStackTrace();
    				}
    				//clear editText
    				et_sendRoomMsg.setText("");
    			}
    		});
    	}
    
    	/**
    	 * Receives the message
    	 */
    	private Handler handler = new Handler() {
    		public void handleMessage(android.os.Message msg) {
    			Message m = new Message();
    			m = (Message) msg.obj;
    			String username = m.getFrom().toString().split("/")[1];
    			String body = m.getBody();
    			if (username.equals(loginUser)) {
    				RoomMsg sendRoomMsg = new RoomMsg(loginUser, body,
    						SystemTime.getDate(), "to");
    				listMsg.add(sendRoomMsg);
    				adapter.notifyDataSetChanged();
    			} else {
    				RoomMsg roomMsg = new RoomMsg(username, body,
    						SystemTime.getDate(), "from");
    				listMsg.add(roomMsg);
    				adapter.notifyDataSetChanged();
    			}
    		};
    	};
    	/**
    	 * show dialog
    	 * @param loginUser
    	 * @param muc
    	 */
    	public void showDialog(final String loginUser,final MultiUserChat muc){
    		AlertDialog.Builder builder = new AlertDialog.Builder(RoomChatActivity.this);
    		builder.setInverseBackgroundForced(true);
    		View view = LayoutInflater.from(RoomChatActivity.this).inflate(
    				R.layout.joinroom_item, null);
    		final EditText et_password = (EditText) view
    				.findViewById(R.id.et_password);
    		Button btn_login = (Button) view.findViewById(R.id.btn_join);
    		btn_login.setOnClickListener(new OnClickListener() {
    
    			@Override
    			public void onClick(View arg0) {
    				String password = et_password.getText().toString();
    				if (password != null && password.length() != 0) {
    					dialog.dismiss();
    					try {
    						muc.join(loginUser, password);
    					} catch (XMPPException e) {
    						e.printStackTrace();
    						int code = e.getXMPPError().getCode();
    						if (code == 401) {
    							Toast.makeText(RoomChatActivity.this, R.string.passwordError, Toast.LENGTH_SHORT).show();
    							// password is error
    							finish();
    						}else {
    							finish();
    						}
    					}
    				} else {
    					Toast.makeText(RoomChatActivity.this, R.string.PasswordNotEmpty,
    							Toast.LENGTH_SHORT).show();
    				}
    			}
    		});
    		Button btn_cancle = (Button) view.findViewById(R.id.btn_cancle);
    		btn_cancle.setOnClickListener(new OnClickListener() {
    
    			@Override
    			public void onClick(View arg0) {
    				dialog.dismiss();
    				finish();
    			}
    		});
    		builder.setView(view);
    		dialog = builder.create();
    		dialog.show();
    	}
    }

4、这里和单聊一样我同样建了一个类RoomMsg.java:

package org.hkby.lwx.common;
    
    
    /**
     * room message
     * @author liaowuxing
     *
     */
    public class RoomMsg {
    
    
    	public String username;
    	public String msg;
    	public String date;
    	public String fromorto;
    
    
    	public RoomMsg(String username, String msg, String date,String fromorto) {
    		this.username = username;
    		this.msg = msg;
    		this.date = date;
    		this.fromorto = fromorto;
    	}
    }

5、adapter代码，RoomChatAdapter.java：

package org.hkby.lwx.adapter;
    
    import java.util.List;
    
    import org.hkby.lwx.activity.R;
    import org.hkby.lwx.common.RoomMsg;
    
    import android.content.Context;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.BaseAdapter;
    import android.widget.TextView;
    /**
     * adapter
     * @author liaowuxing
     *
     */
    public class RoomChatAdapter extends BaseAdapter {
    	private List<RoomMsg> listMsg;
    	private Context context;
    	private LayoutInflater mInflater;
    	public RoomChatAdapter(Context context,List<RoomMsg> listMsg) {
    		super();
    		this.context = context;
    		this.listMsg = listMsg;
    		mInflater = LayoutInflater.from(context);
    	}
    
    	@Override
    	public int getCount() {
    		return listMsg.size();
    	}
    
    	@Override
    	public Object getItem(int position) {
    		return listMsg.get(position);
    	}
    
    	@Override
    	public long getItemId(int position) {
    		return position;
    	}
    
    	@Override
    	public View getView(int position, View convertView, ViewGroup parent) {
    		if (listMsg.get(position).fromorto.equals("from")) {
    			ViewHolder viewHolder = new ViewHolder();
    			convertView = mInflater.inflate(R.layout.roomchart_from_item, null);
    			viewHolder.tv_roomName = (TextView)convertView.findViewById(R.id.tv_from_roomName);
    			viewHolder.tv_roomDate = (TextView)convertView.findViewById(R.id.tv_from_roomDate);
    			viewHolder.tv_roomMsg = (TextView)convertView.findViewById(R.id.tv_from_roomMsg);
    			convertView.setTag(viewHolder);
    		}else {
    			ViewHolder viewHolder = new ViewHolder();
    			convertView = mInflater.inflate(R.layout.roomchat_to_item, null);
    			viewHolder.tv_roomName = (TextView)convertView.findViewById(R.id.tv_to_roomName);
    			viewHolder.tv_roomDate = (TextView)convertView.findViewById(R.id.tv_to_roomDate);
    			viewHolder.tv_roomMsg = (TextView)convertView.findViewById(R.id.tv_to_roomMsg);
    			convertView.setTag(viewHolder);
    		}
    		ViewHolder vHolder = (ViewHolder) convertView.getTag();
    		//message
    		String msg = listMsg.get(position).msg;
    		if (msg == null) {
    			vHolder.tv_roomMsg.setText("");
    		}else {
    			vHolder.tv_roomMsg.setText(msg);
    		}
    		//date
    		String date = listMsg.get(position).date;
    		if (msg == null) {
    			vHolder.tv_roomDate.setText("");
    		}else {
    			vHolder.tv_roomDate.setText(date);
    		}
    		//username
    		String name = listMsg.get(position).username;
    		if (msg == null) {
    			vHolder.tv_roomName.setText("");
    		}else {
    			vHolder.tv_roomName.setText(name);
    		}
    		return convertView;
    	}
    
    	private class ViewHolder{
    		private TextView tv_roomName;
    		private TextView tv_roomDate;
    		private TextView tv_roomMsg;
    	}
    }

6、adapter里同样有两个布局，一个roomchart\_from\_item.xml代码：

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    
        <TextView
            android:id="@+id/tv_from_roomName"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true"
            android:layout_marginLeft="10dp"
            android:textColor="#ff0000"
            android:textSize="16sp"
            android:textStyle="bold" />
    
        <TextView
            android:id="@+id/tv_from_roomDate"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_marginLeft="10dp"
            android:layout_toRightOf="@+id/tv_from_roomName" />
    
        <LinearLayout
            android:id="@+id/ll_from_room"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_below="@+id/tv_from_roomName"
            android:layout_marginBottom="5sp"
            android:layout_marginLeft="10sp"
            android:background="@drawable/roomchart_from_bg" >
    
            <TextView
                android:id="@+id/tv_from_roomMsg"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
        </LinearLayout>
    
    </RelativeLayout>

7、一个roomchat\_to\_item.xml代码：

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    
        <TextView
            android:id="@+id/tv_to_roomName"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true"
            android:layout_marginLeft="10dp"
            android:textColor="#0000ff"
            android:textSize="16sp"
            android:textStyle="bold" />
    
        <TextView
            android:id="@+id/tv_to_roomDate"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_marginLeft="10dp"
            android:layout_toRightOf="@+id/tv_to_roomName" />
    
        <LinearLayout
            android:id="@+id/ll_to_room"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_below="@+id/tv_to_roomName"
            android:layout_marginBottom="5sp"
            android:layout_marginLeft="10sp"
            android:background="@drawable/roomchart_tobg" >
    
            <TextView
                android:id="@+id/tv_to_roomMsg"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
        </LinearLayout>
    
    </RelativeLayout>

8、dialog布局代码：

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    
        <TextView
            android:id="@+id/tv_showMsg"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/tv_password"
            android:layout_alignParentTop="true"
            android:layout_marginTop="18dp"
            android:text="@string/tv_showMsg"
            android:textColor="#ff0000" />
    
        <TextView
            android:id="@+id/tv_password"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBottom="@+id/et_password"
            android:layout_alignLeft="@+id/btn_join"
            android:text="@string/roomPassword"
            android:textSize="16sp" />
    
        <EditText
            android:id="@+id/et_password"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_below="@+id/tv_showMsg"
            android:layout_marginTop="24dp"
            android:layout_toRightOf="@+id/tv_password"
            android:ems="10"
            android:hint="@string/et_inputPassword"
            android:inputType="textPassword" >
    
            <requestFocus />
        </EditText>
    
        <Button
            android:id="@+id/btn_join"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_below="@+id/et_password"
            android:layout_marginLeft="10sp"
            android:layout_marginTop="20sp"
            android:text="@string/btn_join" />
    
        <Button
            android:id="@+id/btn_cancle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_alignTop="@+id/btn_join"
            android:text="@string/btn_cancle" />
    
    </RelativeLayout>

9、string.xml代码：

<string name="createRoom">创建房间</string>
        <string name="roomchat_hint">请输入内容</string>
        <string name="roomMsgIsEmpty">消息不能为空</string>
        <string name="roomPassword">密码：</string>
        <string name="btn_join">加入</string>
        <string name="btn_cancle">取消</string>
        <string name="tv_showMsg">本聊天室需要密码进入</string>
        <string name="et_inputPassword">请输入密码</string>
        <string name="PasswordNotEmpty">密码不能为空</string>
        <string name="passwordError">密码错误</string>

10、代码写完了，看一下工程结构：

![Center][]

11、聊天效果图：

![Center 1][]

12、ok，今天就到这了，哈哈![偷笑][titter.gif]

[Center]: /images/20220810/dc1499bf3e714094bff4b6410e1a01a8.png
[Center 1]: /images/20220810/29097f0555c14bb89e0ae0dcccbbc38a.png
[titter.gif]: /images/20220810/75292c08f7774a68864a0e0e15fca622.png