Simple Publisher and Subscriber for rosjava
I am working on an android application that will subscribe to a topic. When a message is received, I would like to display the message in a TextView. In my RosActivity's onCreate function I made a simple timer to periodically update the TextView:
timer.scheduleAtFixedRate(new TimerTask() {
public void run() {
runOnUiThread(new Runnable() {
public void run() {
//accesses a public static String variable from the
//Listener class
myAwesomeTextView.setText( Listener.msg );
}
});
}
}, 100, 1000);
While in Listener, a subclass of AbstractNodeMain, I have a simple callback function that stores the result in the very same msg
static variable
subscriber.addMessageListener(new MessageListener<std_msgs.String>() {
@Override
public void onNewMessage(std_msgs.String message) {
msg = message.getData();
}
});
Interestingly enough, the program will read and display messages received over the topic, but only when the program initially loads.