[英]Toast Message is not created when message received at Java Websocket server in Android
I am trying to create basic WebSocket server with this library.我正在尝试使用此库创建基本的 WebSocket 服务器。 I want to make a toast message when a message is received.我想在收到消息时制作一条吐司消息。 In onMessage() function below I have implemented that.在下面的 onMessage() 函数中,我已经实现了。 But no toast message is happening.但是没有发生吐司消息。
But Received message is printed on console.但是 Received 消息打印在控制台上。
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("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();
}
I think you have to switch to the UI thread to show the Toast.我认为您必须切换到 UI 线程才能显示 Toast。
You can try using a Handler
:您可以尝试使用Handler
:
new Handler(Looper.getMainLooper()).post(new Runnable() {
public void run() {
Toast.makeText(MainActivity.this, "Received: " + message, Toast.LENGTH_SHORT).show();
}
});
Or calling runOnUiThread
:或调用runOnUiThread
:
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this, "Received: " + message, Toast.LENGTH_SHORT).show();
}
});
Or broadcasting the message:或广播消息:
@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:并在您的活动中注册一个 BroadcastReceiver:
private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String message = intent.getExtras().getString("message");
Toast.makeText(MainActivity.this, "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();
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.