How Do I Fix Android Tcp Server

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Java

private void runTcpServer() {
        ServerSocket ss = null;
        try {
            ss = new ServerSocket(TCP_SERVER_PORT);
            //ss.setSoTimeout(10000);
            //accept connections
            Socket s = ss.accept();
            BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));
            BufferedWriter out = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
            //receive a message
            String incomingMsg = in.readLine() + System.getProperty("line.separator");
            Log.i("TcpServer", "received: " + incomingMsg);
            text.append("received: " + incomingMsg);
            //send a message
            String outgoingMsg = "goodbye from port " + TCP_SERVER_PORT + System.getProperty("line.separator");
            out.write(outgoingMsg);
            out.flush();
            Log.i("TcpServer", "sent: " + outgoingMsg);
            text.append("sent: " + outgoingMsg);
            //SystemClock.sleep(5000);
            s.close();
        } catch (InterruptedIOException e) {
            //if timeout occurs
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (ss != null) {
                try {
                    ss.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

i try to run the runTcp methods the program work until Socket s = ss.accept();
then the application crashed

How can i fix this?

Posted 12-Dec-14 3:26am

Member 10525430

Updated 12-Dec-14 3:38am

DamithSL

v2

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Comments

Afzaal Ahmad Zeeshan 12-Dec-14 9:45am

While the application crashed, it must have given an error A.K.A Exception. Please provide that exception.

Member 10525430 12-Dec-14 9:58am

Android program is crash.it says Unfortunalty the program determined or something like that:)

Afzaal Ahmad Zeeshan 12-Dec-14 10:20am

And what is something like that. Because it is required, otherwise we can't help you out in this problem, please add that.

Member 10525430 12-Dec-14 10:41am

It is not problem on android studio,its problem from emulator.When i run the app the emulator says unable problem on this.This program are stopped.

Afzaal Ahmad Zeeshan 12-Dec-14 10:50am

See the console of the Android Studio for the details on the Error.

Member 10525430 12-Dec-14 11:01am

Console:

12-12 10:57:42.960 830-830/com.example.onur.tcpserver D/dalvikvm﹕ Not late-enabling CheckJNI (already on)
12-12 10:57:45.360 830-830/com.example.onur.tcpserver D/AndroidRuntime﹕ Shutting down VM
12-12 10:57:45.360 830-830/com.example.onur.tcpserver W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0xb4a96ba8)
12-12 10:57:45.370 830-830/com.example.onur.tcpserver E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.onur.tcpserver, PID: 830
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.onur.tcpserver/com.example.onur.tcpserver.MyActivity}: android.os.NetworkOnMainThreadException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1145)
at libcore.io.BlockGuardOs.accept(BlockGuardOs.java:54)
at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:98)
at java.net.ServerSocket.implAccept(ServerSocket.java:203)
at java.net.ServerSocket.accept(ServerSocket.java:128)
at com.example.onur.tcpserver.MyActivity.runTcpServer(MyActivity.java:53)
at com.example.onur.tcpserver.MyActivity.onCreate(MyActivity.java:23)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
            at android.app.ActivityThread.access$800(ActivityThread.java:135)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)
12-12 10:59:28.323 1120-1120/com.example.onur.tcpserver D/AndroidRuntime﹕ Shutting down VM
12-12 10:59:28.323 1120-1120/com.example.onur.tcpserver W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0xb4a96ba8)
12-12 10:59:28.333 1120-1120/com.example.onur.tcpserver E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.onur.tcpserver, PID: 1120
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.onur.tcpserver/com.example.onur.tcpserver.MyActivity}: android.os.NetworkOnMainThreadException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
at an

Afzaal Ahmad Zeeshan 12-Dec-14 11:27am

Have a look at understanding the CheckJNI: http://android-developers.blogspot.in/2011/07/debugging-android-jni-with-checkjni.html

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E.F. Nijboer · Answer 1 · 2014-12-12T05:18:00

Solution 1

You perform a networking operation on the main thread which is not allowed. For more details:
http://developer.android.com/reference/android/os/NetworkOnMainThreadException.html[^]

http://android-er.blogspot.nl/2012/04/androidosnetworkonmainthreadexception.html[^]

Good luck!

Posted 12-Dec-14 5:18am

E.F. Nijboer

v2