Twilio Android：加入频道时出现问题："Member already exists"

Question

我在安卓中使用Twilio可编程聊天API进行1对1聊天。

以下是我的用例：

1) I create a unique channel name
2) Check if the channel already exists or not
if channel exists:
user joins channel
else
create a channel with unique name
user joins channel
end

现在，正在发生的事情是，当我尝试加入频道时，它给了我错误："会员已经存在"。因此，此时，如果我尝试检查频道的成员，我会得到 Member 对象为 null。 在这一点上，我有两个疑问：

1( 如果用户对象已经是频道的一部分，它不应该包含这个成员吗？ 2(如果用户已经是频道的一部分，我应该能够通过添加channelListener向频道发送消息，在这种情况下不会发生。

我不明白这个问题。以下是我的代码片段：

ChatClient.Properties props = new ChatClient.Properties.Builder()
.createProperties();
ChatClient.create(ChatActivity.this, accessToken, props, mChatClientCallback);
private CallbackListener<ChatClient> mChatClientCallback =
new CallbackListener<ChatClient>() {
@Override
public void onSuccess(ChatClient chatClient) {
mChatClient = chatClient;
//loadChannels();
Log.i(TAG, "Success creating Twilio Chat Client");
createOrJoinChannel();
}
@Override
public void onError(ErrorInfo errorInfo) {
Log.i(TAG,"Error creating Twilio Chat Client: " + errorInfo.getMessage());
}
};

private void createOrJoinChannel(){
//Only SID or unique name of channel can be supplied as parameter
mChatClient.getChannels().getChannel(UNIQUE_CHANNEL_NAME, new CallbackListener<Channel>() {
@Override
public void onSuccess(Channel channel) {
if (channel != null) {
joinChannel(channel);
} else {
Log.i(TAG, "Error occurred in getting channel");
}
}
@Override
public void onError(ErrorInfo errorInfo) {
Log.i(TAG,"Error retrieving channel: " + errorInfo.getMessage());
createChannel();
}
});
}
private void joinChannel(final Channel channel) {
Log.i(TAG, "inside join channel" + channel.getUniqueName());
Log.i(TAG, "channel status: " + channel.getStatus());
Members members = channel.getMembers();
if(members!=null){
ArrayList<Member> list = (ArrayList<Member>) members.getMembersList();
for(int i=0; i<list.size(); i++){
Log.i(TAG, "member " + i + list.get(i).getIdentity());
}
}else{
Log.i(TAG, "null object"); //Getting this even when I get 
//"Member already exists" error
}
channel.join(new StatusListener() {
@Override
public void onSuccess() {
mGeneralChannel = channel;
mGeneralChannel.addListener(mDefaultChannelListener);
}
@Override
public void onError(ErrorInfo errorInfo) {
//Error joining channel: Member already exists
Log.i(TAG,"Error joining channel: " + errorInfo.getMessage());
});
}
private void createChannel(){
mChatClient.getChannels().createChannel(FRIENDLY_CHANNEL_NAME,
Channel.ChannelType.PUBLIC, new CallbackListener<Channel>() {
@Override
public void onSuccess(Channel channel) {
if (channel != null) {
setUniqueNameAndJoin(channel);
}
}
@Override
public void onError(ErrorInfo errorInfo) {
Log.i(TAG,"chats: " + "Unique name could not be set: " + errorInfo.getMessage());
}
});
}
private void setUniqueNameAndJoin(final Channel channel){
channel.setUniqueName(UNIQUE_CHANNEL_NAME, new StatusListener() {
@Override
public void onSuccess() {
Log.i(TAG, "channel with unique name created " + channel.getUniqueName());
joinChannel(channel);
}
@Override
public void onError(ErrorInfo errorInfo) {
super.onError(errorInfo);
}
});
}

private ChannelListener mDefaultChannelListener = new ChannelListener() {
@Override
public void onMessageAdded(final Message message) {
Log.i(TAG, "Message added");
ChatActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
// need to modify user interface elements on the UI thread
mMessages.add(message);
mMessagesAdapter.notifyItemInserted(mMessages.size()-1);
}
});
}
@Override
public void onMessageUpdated(Message message, Message.UpdateReason updateReason) {
Log.i(TAG, "Message updated: " + message.getMessageBody());
}
@Override
public void onMessageDeleted(Message message) {
Log.d(TAG, "Message deleted");
}
@Override
public void onMemberAdded(Member member) {
Log.i(TAG, "Member added: " + member.getIdentity());
}
@Override
public void onMemberUpdated(Member member, Member.UpdateReason updateReason) {
}
@Override
public void onMemberDeleted(Member member) {
}
@Override
public void onTypingStarted(Channel channel, Member member) {
}
@Override
public void onTypingEnded(Channel channel, Member member) {
}
@Override
public void onSynchronizationChanged(Channel channel) {
}
};

有人可以向我解释一下，我做错了什么，或者应该正确的做事方式是什么？提前感谢！

Answer 1

Twilio开发者布道者在这里。

您需要使用channel.getStatus()检查当前用户的频道状态。在Android聊天教程中有一个很好的例子。

if (this.currentChannel.getStatus() == Channel.ChannelStatus.JOINED) {
// already in the channel, load the messages
} else {
// join the channel
}