英文:
Toast Message is not created when message received at Java Websocket server in Android
问题
我正在尝试使用 这个 库创建基本的WebSocket服务器。
当接收到消息时，我想要显示一个提示消息。
在下面的onMessage()函数中，我已经实现了这一点。但是没有显示提示消息。
但是接收到的消息会打印在控制台上。
WebSocketServer ws = new WebSocketServer(new InetSocketAddress(3000)) {
@Override
public void onOpen(WebSocket conn, ClientHandshake handshake) {
conn.send("Hello world");
}
@Override
public void onClose(WebSocket conn, int code, String reason, boolean remote) {
}
@Override
public void onMessage(WebSocket conn, String message) {
System.out.println("Received: " + message);
Toast.makeText(MainActivity.this, "Received: " + message, Toast.LENGTH_SHORT).show();
}
@Override
public void onError(WebSocket conn, Exception ex) {
}
@Override
public void onStart() {
}
};
ws.start();
英文:
I am trying to create basic WebSocket server with this library.
I want to make a toast message when a message is received.
In onMessage() function below I have implemented that. But no toast message is happening.
But Received message is printed on console.
WebSocketServer ws = new WebSocketServer(new InetSocketAddress(3000)) {
@Override
public void onOpen(WebSocket conn, ClientHandshake handshake) {
conn.send("Hello world");
}
@Override
public void onClose(WebSocket conn, int code, String reason, boolean remote) {
}
@Override
public void onMessage(WebSocket conn, String message) {
System.out.println("Recieved: "+message);
Toast.makeText(MainActivity.this, "Recieved: " + message, Toast.LENGTH_SHORT).show();
}
@Override
public void onError(WebSocket conn, Exception ex) {
}
@Override
public void onStart() {
}
};
ws.start();
}
答案1
得分: 0
我认为你需要切换到UI线程来显示Toast。
你可以尝试使用Handler：
new Handler(Looper.getMainLooper()).post(new Runnable() {
public void run() {
Toast.makeText(MainActivity.this, "接收到消息：" + message, Toast.LENGTH_SHORT).show();
}
});
或者调用runOnUiThread：
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this, "接收到消息：" + message, Toast.LENGTH_SHORT).show();
}
});
或者广播消息：
@Override
public void onMessage(WebSocket conn, String message) {
System.out.println("接收到消息：" + message);
Intent intent = new Intent("msgReceived");
intent.putExtra("message", message);
LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
}
然后在你的Activity中注册一个BroadcastReceiver：
private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String message = intent.getExtras().getString("message");
Toast.makeText(MainActivity.this, "接收到消息：" + message, Toast.LENGTH_SHORT).show();
}
};
@Override
protected void onStart() {
super.onStart();
LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver, new IntentFilter("msgReceived"));
}
@Override
protected void onStop() {
LocalBroadcastManager.getInstance(this).unregisterReceiver(mMessageReceiver);
super.onStop();
}
英文:
I think you have to switch to the UI thread to show the Toast.
You can try using a Handler:
new Handler(Looper.getMainLooper()).post(new Runnable() {
public void run() {
Toast.makeText(MainActivity.this, "Received: " + message, Toast.LENGTH_SHORT).show();
}
});
Or calling runOnUiThread:
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this, "Received: " + message, Toast.LENGTH_SHORT).show();
}
});
Or broadcasting the message:
@Override
public void onMessage(WebSocket conn, String message) {
System.out.println("Recieved: "+message);
Intent intent = new Intent("msgReceived");
intent.putExtra("message", message);
LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
}
And registering a BroadcastReceiver in your Activity:
private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String message = intent.getExtras().getString("message");
Toast.makeText(MainActivity.this, "Received: " + message, Toast.LENGTH_SHORT).show();
}
};
@Override
protected void onStart() {
super.onStart();
LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver, new IntentFilter("msgReceived"));
@Override
protected void onStop() {
LocalBroadcastManager.getInstance(this).unregisterReceiver(mMessageReceiver);
super.onStop();
}
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