我正在使用 socketIO 库开发一个聊天应用程序。除了 UI 更新之外，一切似乎都运行良好。我能够向端口发送消息并从中接收。但收到后，我无法更新 textview 或任何其他 UI。代码如下
非常感谢任何帮助
注意：祝酒词来了，**更新的*消息也会在下一条新消息到来时显示
聊天室活动.java
public class chatRoomActivity extends Activity implements OnClickListener{
int channelId = 0;
public final String SocketURL = "someURL";
String userName = "";
int connectioAttempt = 0;
SocketIOClient socketClient = null;
SocketIOClientOperations sioOps = null;
Button chatRoomSend = null;
EditText chatInput = null;
TextView msgcntr;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.chat_room);
chatRoomSend = (Button)findViewById(R.id.chatRoomSendBtn);
chatInput = (EditText)findViewById(R.id.chatRoomInput);
msgcntr=(TextView)findViewById(R.id.textView1);
chatRoomSend.setOnClickListener(this);
sioOps = new SocketIOClientOperations();
msgcntr = (TextView) findViewById(R.id.textView1);
socketClient = sioOps.connectToSocket(SocketURL);
System.out.println("**********Connected**********");
if(socketClient != null)
{
boolean joined = false;
joined = sioOps.joinChannel(socketClient, channelId);
System.out.println("*******Joined*********");
}
else
{
System.out.println("*******Null*********");
}
socketClient.on("incomingMessage", new EventCallback() {
public void onEvent(JSONArray argument, Acknowledge acknowledge) {
System.out.println("***************New Message*********");
System.out.println("***************"+argument.toString()+"*********");
msgcntr.setText("test");
updateClock();
}
});
}
@Override
public void onClick(View v) {
if(v == chatRoomSend)
{
boolean sent = sioOps.sendNewMessage(socketClient, userName, "empty");
if(sent)
System.out.println("************** Message Sent *********");
else
System.out.println("************** Message Failed *********");
}
}
protected void updateClock() {
runOnUiThread(new Runnable(){
public void run() {
Toast.makeText(getApplicationContext(), "end", Toast.LENGTH_SHORT).show();
msgcntr.setText("test");
System.out.print("************Updated*********");
}
});
}
}
socketIOClientOperations.java
public class SocketIOClientOperations {
public SocketIOClientOperations(){}
public SocketIOClient connectToSocket(String SocketURL)
{
SocketIORequest connectionRequest = new SocketIORequest(SocketURL);
SocketIOClient socketClient = null;
try {
socketClient = SocketIOClient.connect(AsyncHttpClient.getDefaultInstance(), connectionRequest, null).get();
} catch (InterruptedException e) {
e.printStackTrace();
return null;
} catch (ExecutionException e) {
e.printStackTrace();
return null;
}
return socketClient;
}
public boolean joinChannel(SocketIOClient client,int channelId)
{
JSONArray joinChannel = new JSONArray();
JSONObject values = new JSONObject();
try {
values.put("channelID", channelId);
joinChannel.put(values);
client.emit("joinChannel", joinChannel);
return true;
} catch (JSONException e) {
e.printStackTrace();
return false;
}
}
public boolean sendNewMessage(SocketIOClient client,String name,String txt)
{
JSONArray newMsg = new JSONArray();
JSONObject msgBody = new JSONObject();
try {
msgBody.put("From", name);
msgBody.put("Content", txt);
newMsg.put(msgBody);
client.emit("newMessage", newMsg);
System.out.println("***************SendMessage*********");
System.out.println("************** "+newMsg.toString()+" *********");
return true;
} catch (JSONException e) {
e.printStackTrace();
return false;
}
}
}
聊天室.xml
<?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"
android:orientation="vertical" >
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="40dp"
android:background="#000"
android:padding="10dp"
android:id="@+id/header">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Chat Room"
android:textColor="#fff"
android:textSize="14sp"/>
</RelativeLayout>
<ListView
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:stackFromBottom="true"
android:layout_above="@+id/footer"
android:layout_below="@+id/header"
android:id="@+id/chatRoomMsgs"
android:background="#cccccc"
android:visibility="gone" />
<TextView
android:id="@+id/msgConatainer"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_above="@+id/fooer"
android:layout_below="@+id/header"
android:background="#ccc"
android:textColor="#000" />
<RelativeLayout
android:id="@+id/fooer"
android:background="#000"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="5dp"
android:layout_alignParentBottom="true">
<EditText
android:id="@+id/chatRoomInput"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter your message...."
android:layout_toLeftOf="@+id/chatRoomSendBtn"
android:layout_alignParentLeft="true"/>
<Button
android:id="@+id/chatRoomSendBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Send"
android:layout_alignParentRight="true" />
</RelativeLayout>
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/msgConatainer"
android:layout_centerHorizontal="true"
android:layout_marginBottom="48dp"
android:text="TextView"
android:textColor="@android:color/black" />
</RelativeLayout>