websocket unable to connect to android emulator
Question
So here's the code for my very simple WebSocket code to connect to the Android Emulator ... and it hangs.
I can confirm I can telnet to the emulator fine. I can also Websocket to a web server ok, even though http gives the old "unexpect response code 200". I can also confirm that the readState is a constant zero.
I can also confirm that a connection is established when the page is connected and disconnects when it's removed.
Whilst page up:
$ netstat -a | grep 5554
TCP 127.0.0.1:5554 eww:0 LISTENING
TCP 127.0.0.1:5554 eww:49516 ESTABLISHED
TCP 127.0.0.1:5554 eww:54424 ESTABLISHED
TCP 127.0.0.1:49516 eww:5554 ESTABLISHED
TCP 127.0.0.1:54424 eww:5554 ESTABLISHED
After page removed:
$ netstat -a | grep 5554
TCP 127.0.0.1:5554 eww:0 LISTENING
TCP 127.0.0.1:5554 eww:49516 ESTABLISHED
TCP 127.0.0.1:49516 eww:5554 ESTABLISHED
TCP 127.0.0.1:54424 eww:5554 TIME_WAIT
I'm using Chrome and this is all running on Windows 7. The other connection is likely to be Eclipse.
Any thoughts?
<!DOCTYPE html>
<html>
<head>
<title>Telnet to Android Emulator</title>
<style>
#messages {
list-style: none;
}
</style>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
</head>
<body>
<h1>Telnet to Android Emulator</h1>
<ul id="messages">
</ul>
<script>
$(document).ready(function() {
function log(message) {
$('#messages').append('<li>' + message + '</li>');
}
var socket;
if ("WebSocket" in window) {
log("WebSocket API supported");
} else {
log("WebSocket API not supported");
}
function wsOpen(e) {
log("OPEN");
}
function wsClose(e) {
log("CLOSED");
}
function wsError(e) {
log("ERROR " + e.data);
}
function wsMessage(e) {
log(e.data);
}
function openSocket() {
var wsuri = "ws://localhost:5554";
log("connecting to " + wsuri);
try {
socket = new WebSocket(wsuri);
socket.onopen = wsOpen;
socket.onclose = wsClose;
socket.onerror = wsError;
socket.onmessage = wsMessage;
} catch (exception) {
log('Caught ' + exception);
}
}
function closeSocket() {
log("disconnecting");
socket.close();
}
openSocket(); // down here for testing
});
</script>
</body>
</html>
2 answers
solution1
0 ACCPTED 2013-09-17 05:22:42
WebSocket is a protocol in its own right and the Android Emulator does not speak it. That's why it's not connecting or calling the onopen function.
Time for a new strategy
solution2
0 2013-09-21 01:47:12
I solved the problem by writing a Java Applet which does a telnet connection then passed information from the web page through it. In this case, I used clicks on a Google Map to pass "geo fix" data.
https://github.com/stevemarvell/GoogleMapToAndroidEmulator
It's not perfect, but it's a start.
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