我正在构建一个使用pubnub的Android应用，允许用户互相聊天。用户名和聊天频道是通过Parse设置的，我设法让聊天的发布和订阅部分工作。我要做的下一部分是为要显示的聊天设置自定义列表视图。
我希望聊天显示在whatsapp等气泡中，并且消息要么显示屏幕的一侧。
我创建了一个自定义的chat_item.xml来保存listview中的每一行，一个ChatArrayAdapter.java和一个ChatMessage.java对象来保存每条消息。
我知道我非常接近它工作但它的结构在某个地方是错误的，每次收到一条消息并添加到列表中我在ChatArrayAdapter.java的第28行得到Only the original thread that created a view hierarchy can touch its views.异常super.add(object);内：
@Override
public void add(ChatMessage object) {
chatMessageList.add(object);
super.add(object);
}.
有谁能告诉我这里做错了什么？我觉得我已经接近工作了，并且构建块在那里，它只是没有以正确的方式构建。
ChatActivity.java：
public class ChatActivity extends Activity {
final Pubnub pubnub = new Pubnub("example", "example");
TextView tvBtnBackToSelection;
TextView tvBtnNewChat;
EditText etMessageText;
Button btnSendMessage;
private ChatArrayAdapter chatArrayAdapter;
private ListView listView;
String USER_ID;
String CHAT_ID;
String CHAT_STATUS;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chat);
//get data passed from last activity by intent
Intent intent = getIntent();
USER_ID = intent.getStringExtra("USER_ID");
CHAT_ID = intent.getStringExtra("CHAT_ID");
CHAT_STATUS = intent.getStringExtra("CHAT_STATUS");
//initialise ui and pubnub
uiInit();
//subscribe to chat channel
subscribeToChat(CHAT_ID);
//initialise chat presence
chatPresenceInit(CHAT_ID);
}
//-----inistialise ui
public void uiInit() {
listView = (ListView) findViewById(R.id.lvChatList);
chatArrayAdapter = new ChatArrayAdapter(getApplicationContext(), R.layout.chat_item, USER_ID);
listView.setAdapter(chatArrayAdapter);
tvBtnBackToSelection = (TextView) findViewById(R.id.tvBtnBackToSelection);
tvBtnNewChat = (TextView) findViewById(R.id.tvBtnNewChat);
etMessageText = (EditText) findViewById(R.id.etMessageText);
btnSendMessage = (Button) findViewById(R.id.btnSendMessage);
tvBtnBackToSelection.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
backToSelection();
}
});
tvBtnNewChat.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
btnSendMessage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//publish message to chat
publishToChat(etMessageText.getText().toString());
//set edittext back to null
etMessageText.setText("");
}
});
}
//-----subscribe to chat channel
public void subscribeToChat(String chatChannel) {
try {
pubnub.subscribe(chatChannel, new Callback() {
@Override
public void connectCallback(String channel, Object message) {
System.out.println("SUBSCRIBE : CONNECT on channel:" + channel
+ " : " + message.getClass() + " : "
+ message.toString());
}
@Override
public void disconnectCallback(String channel, Object message) {
System.out.println("SUBSCRIBE : DISCONNECT on channel:" + channel
+ " : " + message.getClass() + " : "
+ message.toString());
}
public void reconnectCallback(String channel, Object message) {
System.out.println("SUBSCRIBE : RECONNECT on channel:" + channel
+ " : " + message.getClass() + " : "
+ message.toString());
}
@Override
public void successCallback(String channel, Object message) {
String messageSplit[] = message.toString().split("_");;
String receivedUserID = messageSplit[0];
String receivedMessage = messageSplit[1];
System.out.println("CHANNEL: " + channel);
System.out.println("USERID: " + receivedUserID);
System.out.println("MESSAGE: " + receivedMessage);
chatArrayAdapter.add(new ChatMessage(receivedUserID, receivedMessage));
}
@Override
public void errorCallback(String channel, PubnubError error) {
System.out.println("SUBSCRIBE : ERROR on channel " + channel
+ " : " + error.toString());
}
}
);
}
catch(Exception e) {
}
}
//-----publish to chat channel
public void publishToChat(String message) {
message = message.replace("_", "").trim();
message = USER_ID + "_" + message;
//set up publish callback
Callback callback = new Callback() {
public void successCallback(String channel, Object response) {
System.out.println(response.toString());
}
public void errorCallback(String channel, PubnubError error) {
System.out.println(error.toString());
}
};
//publish message to channel
pubnub.publish(CHAT_ID, message, callback);
}
}
ChatMessage.java：
public class ChatMessage {
public String user;
public String message;
public ChatMessage(String user, String message) {
super();
this.user = user;
this.message = message;
}
}
ChatArrayAdapter.java
public class ChatArrayAdapter extends ArrayAdapter<ChatMessage> {
public TextView tvChatLeft;
public TextView tvChatRight;
private List<ChatMessage> chatMessageList = new ArrayList<ChatMessage>();
String thisUserId;
@Override
public void add(ChatMessage object) {
chatMessageList.add(object);
super.add(object);
}
public ChatArrayAdapter(Context context, int textViewResourceId, String userId) {
super(context, textViewResourceId);
thisUserId = userId;
}
public int getCount() {
return this.chatMessageList.size();
}
public ChatMessage getItem(int index) {
return this.chatMessageList.get(index);
}
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
if (row == null) {
LayoutInflater inflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(R.layout.chat_item, parent, false);
}
ChatMessage chatMessageObj = getItem(position);
tvChatRight = (TextView)row.findViewById(R.id.tvChatBubbleRight);
tvChatLeft = (TextView)row.findViewById(R.id.tvChatBubbleLeft);
//create flag to define if message sender is current user
final boolean isMe = chatMessageObj.user.equals(thisUserId);
if (isMe) {
//get message text from parse
String messageText = chatMessageObj.message;
//if message text is not null
if (!messageText.equals(null)||!messageText.equals("")||!messageText.equals(" ")) {
//set message to right chat bubble
tvChatRight.setText(messageText);
//set right textview bubble gravity to right and set as visible
tvChatRight.setGravity(Gravity.RIGHT);
tvChatRight.setVisibility(View.VISIBLE);
//hide left textview bubble
tvChatLeft.setVisibility(View.GONE);
}
//if a valid message has not been found
else {
}
}
//other user
else {
//get message text from parse
String messageText = chatMessageObj.message;
//if message text is null, only update the users location
if (!messageText.equals(null)||!messageText.equals("")||!messageText.equals(" ")) {
//set left chat bubble at message text
tvChatLeft.setText(messageText);
//set left chat bubble to left and visible
tvChatLeft.setGravity(Gravity.LEFT);
tvChatLeft.setVisibility(View.VISIBLE);
//hide right chat bubble
tvChatRight.setVisibility(View.GONE);
}
//else if a valid message is found then update chat list as well as users location
else {
}
}
return row;
}
public Bitmap decodeToBitmap(byte[] decodedByte) {
return BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);
}
chat_item.xml：
<?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="wrap_content"
android:orientation="vertical" >
<TextView
android:textSize="12sp"
android:id="@+id/tvChatBubbleLeft"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/chat_bubble_left"
android:layout_gravity="left"
android:layout_weight="1"
android:gravity="left">
</TextView>
<TextView
android:textSize="12sp"
android:id="@+id/tvChatBubbleRight"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/chat_bubble_right"
android:layout_gravity="right"
android:gravity="right"
android:layout_weight="1">
</TextView>
</LinearLayout>
答案 0 :(得分：1)
管理让这个工作。我只是添加了
ChatActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
chatArrayAdapter.add(new ChatMessage(receivedUserID, receivedMessage));
}
});
在我的pubnub订阅方法的成功回调中，现在一切正常！