https://stackoverflow.com/questions/18112932
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RussianSolved IT , http://developer.android.com/tools/devices/emulator.html .
The problem was that android emulator instances by defaul can only interact with itself and the ethernet , so different instances can't network with each other .
If you want to do so you first have to set up a redirection in the instances .
Read this page it helps like ... A LOT :D
Android client and server side programming
-
23-06-2022 - |
سؤال
I'm trying to run server side and client side examples I found on the net . Here's the server :
public class ServerActivity extends Activity {
private TextView serverStatus;
private TextView serverStatus2;
// DEFAULT IP
public static String SERVERIP = "10.100.102.15";
// DESIGNATE A PORT
public static final int SERVERPORT = 8080;
private Handler handler = new Handler();
private ServerSocket serverSocket;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_server);
serverStatus = (TextView) findViewById(R.id.server_status);
serverStatus2 = (TextView) findViewById(R.id.server_status2);
SERVERIP = getLocalIpAddress();
Thread fst = new Thread(new ServerThread());
fst.start();
}
public class ServerThread implements Runnable {
public void run() {
try {
if (SERVERIP != null) {
handler.post(new Runnable() {
@Override
public void run() {
serverStatus
.setText("Listening on IP: " + SERVERIP);
}
});
serverSocket = new ServerSocket(SERVERPORT);
while (true) {
// LISTEN FOR INCOMING CLIENTS
Socket client = serverSocket.accept();
handler.post(new Runnable() {
@Override
public void run() {
serverStatus2.setText("Connected.");
}
});
try {
BufferedReader in = new BufferedReader(
new InputStreamReader(
client.getInputStream()));
String line = null;
while ((line = in.readLine()) != null) {
Log.d("ServerActivity", line);
handler.post(new Runnable() {
@Override
public void run() {
// DO WHATEVER YOU WANT TO THE FRONT END
// THIS IS WHERE YOU CAN BE CREATIVE
}
});
}
break;
} catch (Exception e) {
handler.post(new Runnable() {
@Override
public void run() {
serverStatus
.setText("Oops. Connection interrupted. Please reconnect your phones.");
}
});
e.printStackTrace();
}
}
} else {
handler.post(new Runnable() {
@Override
public void run() {
serverStatus
.setText("Couldn't detect internet connection.");
}
});
}
} catch (final Exception e) {
handler.post(new Runnable() {
@Override
public void run() {
serverStatus.setText("Error" + e.getMessage());
}
});
e.printStackTrace();
}
}
}
// GETS THE IP ADDRESS OF YOUR PHONE'S NETWORK
private String getLocalIpAddress() {
try {
for (Enumeration<NetworkInterface> en = NetworkInterface
.getNetworkInterfaces(); en.hasMoreElements();) {
NetworkInterface intf = en.nextElement();
for (Enumeration<InetAddress> enumIpAddr = intf
.getInetAddresses(); enumIpAddr.hasMoreElements();) {
InetAddress inetAddress = enumIpAddr.nextElement();
if (!inetAddress.isLoopbackAddress()) {
return inetAddress.getHostAddress().toString();
}
}
}
} catch (SocketException ex) {
Log.e("ServerActivity", ex.toString());
}
return null;
}
@Override
protected void onStop() {
super.onStop();
try {
// MAKE SURE YOU CLOSE THE SOCKET UPON EXITING
serverSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
And here's the client's code:
public class ClientActivity extends Activity {
private EditText serverIp;
private Button connectPhones;
private String serverIpAddress = "";
private boolean connected = false;
//private Handler handler = new Handler();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_client);
serverIp = (EditText) findViewById(R.id.server_ip);
connectPhones = (Button) findViewById(R.id.connect_phones);
connectPhones.setOnClickListener(connectListener);
}
private OnClickListener connectListener = new OnClickListener() {
@Override
public void onClick(View v) {
if (!connected) {
serverIpserverIpAddress = serverIp.getText().toString();
if (!serverIpAddress.equals("")) {
Thread cThread = new Thread(new ClientThread());
cThread.start();
}
}
}
};
public class ClientThread implements Runnable {
public void run() {
try {
InetAddress serverAddr = InetAddress.getByName(serverIpAddress);
Log.d("ClientActivity", "C: Connecting...");
Socket socket = new Socket(serverAddr,
8080);
connected = true;
while (connected) {
try {
Log.d("ClientActivity", "C: Sending command.");
PrintWriter out = new PrintWriter(
new BufferedWriter(new OutputStreamWriter(
socket.getOutputStream())), true);
// WHERE YOU ISSUE THE COMMANDS
out.println("Hey Server!");
Log.d("ClientActivity", "C: Sent.");
} catch (Exception e) {
Log.e("ClientActivity", "S: Error", e);
}
}
socket.close();
Log.d("ClientActivity", "C: Closed.");
} catch (Exception e) {
Log.e("ClientActivity", "C: Error", e);
connected = false;
}
}
}
}
When running the above on the same eclipse emulator, the server throws and exception "Socket Closed", without even reaching the while loop "while (true)". Does anybody have any idea why?
Here's the console's output:
Android Launch!
adb is running normally.
Performing com.example.server.ServerActivity activity launch
Automatic Target Mode: using existing emulator 'emulator-5554' running compatible AVD 'android2.3'
Uploading server.apk onto device 'emulator-5554'
Installing server.apk...
Success!
Starting activity com.example.server.ServerActivity on device emulator-5554
ActivityManager: Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.example.server/.ServerActivity }
------------------------------
Android Launch!
adb is running normally.
Performing com.example.client.ClientActivity activity launch
Automatic Target Mode: using existing emulator 'emulator-5554' running compatible AVD 'android2.3'
Application already deployed. No need to reinstall.
Starting activity com.example.client.ClientActivity on device emulator-5554
ActivityManager: Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.example.client/.ClientActivity }
And here's the LogCat output:
08-08 13:04:38.165: D/ClientActivity(360): C: Connecting...
08-08 13:04:38.176: E/ClientActivity(360): C: Error
08-08 13:04:38.176: E/ClientActivity(360): java.net.ConnectException: /10.0.2.15:50907 - Connection refused
08-08 13:04:38.176: E/ClientActivity(360): at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:207)
08-08 13:04:38.176: E/ClientActivity(360): at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
08-08 13:04:38.176: E/ClientActivity(360): at java.net.Socket.startupSocket(Socket.java:705)
08-08 13:04:38.176: E/ClientActivity(360): at java.net.Socket.<init>(Socket.java:263)
08-08 13:04:38.176: E/ClientActivity(360): at com.example.client.ClientActivity$ClientThread.run(ClientActivity.java:58)
08-08 13:04:38.176: E/ClientActivity(360): at java.lang.Thread.run(Thread.java:1019)
08-08 13:04:40.456: W/IInputConnectionWrapper(360): showStatusIcon on inactive > > > InputConnection
المحلول
نصائح أخرى
There are 2 points for this:
- If you run the app on the simulator please use the IP address as your machine IP address, don't choose yourself as "10.100.102.15".
- About the port, please choose another port like 50907 or something like that (stay away from KNOWN-PORT like 8080, that usually occupied as the INTERNET port).
Try again and hope this helps.
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