我正在努力解決一個問題，這個問題是關于在 android 的多個文本視圖中顯示來自代理服務器的可用 mqtt 主題，并選擇其中一個來訂閱主題    final MqttAndroidClient client =new MqttAndroidClient(getApplicationContext(),"tcp://iot.eclipse.org:1883","12d45454");    try {        client.connect(mqttConnectOptions, null, new IMqttActionListener() {            @Override            public void onSuccess(IMqttToken mqttToken) {                DisconnectedBufferOptions disconnectedBufferOptions = new DisconnectedBufferOptions();                disconnectedBufferOptions.setBufferEnabled(true);                disconnectedBufferOptions.setBufferSize(100);                disconnectedBufferOptions.setPersistBuffer(false);                disconnectedBufferOptions.setDeleteOldestMessages(false);                Log.i("ERROR ","Topic="+mqttToken.getTopics());                textview1.setText(mqttToken.getTopics()[0]);            }