Vfrdtyky

when i press the system back button my app disconnects but i want to return back in this way :

i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);

I think there is an error in my Socket Service cause gaqve me this:

2018-11-16 11:54:45.869 6099-6099/com.app.ifarma I/SocketService: quit:

2018-11-16 11:54:45.871 6099-6099/com.app.ifarma W/System.err: java.net.SocketException: Socket is closed

2018-11-16 11:54:45.872 6099-6099/com.app.ifarma W/System.err:     at java.net.Socket.getInputStream(Socket.java:930)

2018-11-16 11:54:45.872 6099-6099/com.app.ifarma W/System.err:     at com.app.ifarma.SocketService.closeConnection(SocketService.java:126)

2018-11-16 11:54:45.872 6099-6099/com.app.ifarma W/System.err:     at com.app.ifarma.SocketService.sendMessage(SocketService.java:115)

2018-11-16 11:54:45.872 6099-6099/com.app.ifarma W/System.err:     at com.app.ifarma.Scollega$2.run(Scollega.java:71)

2018-11-16 11:54:45.872 6099-6099/com.app.ifarma W/System.err:     at android.os.Handler.handleCallback(Handler.java:789)

2018-11-16 11:54:45.872 6099-6099/com.app.ifarma W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:98)

2018-11-16 11:54:45.872 6099-6099/com.app.ifarma W/System.err:     at android.os.Looper.loop(Looper.java:164)

2018-11-16 11:54:45.872 6099-6099/com.app.ifarma W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:6541)

2018-11-16 11:54:45.872 6099-6099/com.app.ifarma W/System.err:     at java.lang.reflect.Method.invoke(Native Method)

2018-11-16 11:54:45.872 6099-6099/com.app.ifarma W/System.err:     at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)

2018-11-16 11:54:45.873 6099-6099/com.app.ifarma W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)

2018-11-16 11:54:45.886 6099-6134/com.app.ifarma W/System.err: java.net.SocketException: Socket closed

2018-11-16 11:54:45.886 6099-6134/com.app.ifarma W/System.err:     at java.net.SocketInputStream.socketRead0(Native Method)

2018-11-16 11:54:45.887 6099-6134/com.app.ifarma W/System.err:     at java.net.SocketInputStream.socketRead(SocketInputStream.java:114)

2018-11-16 11:54:45.887 6099-6134/com.app.ifarma W/System.err:     at java.net.SocketInputStream.read(SocketInputStream.java:170)

2018-11-16 11:54:45.887 6099-6134/com.app.ifarma W/System.err:     at java.net.SocketInputStream.read(SocketInputStream.java:139)

2018-11-16 11:54:45.887 6099-6134/com.app.ifarma W/System.err:     at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:288)

2018-11-16 11:54:45.889 6099-6134/com.app.ifarma W/System.err:     at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:351)

2018-11-16 11:54:45.894 6099-6134/com.app.ifarma W/System.err:     at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:180)

2018-11-16 11:54:45.898 6099-6134/com.app.ifarma W/System.err:     at java.io.InputStreamReader.read(InputStreamReader.java:184)

2018-11-16 11:54:45.899 6099-6134/com.app.ifarma W/System.err:     at java.io.BufferedReader.fill(BufferedReader.java:172)

2018-11-16 11:54:45.900 6099-6134/com.app.ifarma W/System.err:     at java.io.BufferedReader.readLine(BufferedReader.java:335)

2018-11-16 11:54:45.905 6099-6134/com.app.ifarma W/System.err:     at java.io.BufferedReader.readLine(BufferedReader.java:400)

2018-11-16 11:54:45.905 6099-6134/com.app.ifarma W/System.err:     at com.app.ifarma.SocketService$ClientThread.run(SocketService.java:272)

2018-11-16 11:54:45.906 6099-6134/com.app.ifarma W/System.err:     at java.lang.Thread.run(Thread.java:764)

2018-11-16 11:54:45.907 6099-6131/com.app.ifarma W/System.err: java.net.SocketException: Socket closed

2018-11-16 11:54:45.907 6099-6131/com.app.ifarma W/System.err:     at java.net.SocketInputStream.socketRead0(Native Method)

2018-11-16 11:54:45.908 6099-6131/com.app.ifarma W/System.err:     at java.net.SocketInputStream.socketRead(SocketInputStream.java:114)

2018-11-16 11:54:45.909 6099-6131/com.app.ifarma W/System.err:     at java.net.SocketInputStream.read(SocketInputStream.java:170)

2018-11-16 11:54:45.909 6099-6131/com.app.ifarma W/System.err:     at java.net.SocketInputStream.read(SocketInputStream.java:139)

2018-11-16 11:54:45.909 6099-6131/com.app.ifarma W/System.err:     at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:288)

2018-11-16 11:54:45.910 6099-6131/com.app.ifarma W/System.err:     at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:351)

2018-11-16 11:54:45.918 6099-6131/com.app.ifarma W/System.err:     at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:180)

2018-11-16 11:54:45.918 6099-6131/com.app.ifarma W/System.err:     at java.io.InputStreamReader.read(InputStreamReader.java:184)

2018-11-16 11:54:45.920 6099-6131/com.app.ifarma W/System.err:     at java.io.BufferedReader.fill(BufferedReader.java:172)

2018-11-16 11:54:45.920 6099-6131/com.app.ifarma W/System.err:     at java.io.BufferedReader.readLine(BufferedReader.java:335)

2018-11-16 11:54:45.921 6099-6131/com.app.ifarma W/System.err:     at java.io.BufferedReader.readLine(BufferedReader.java:400)

2018-11-16 11:54:45.922 6099-6131/com.app.ifarma W/System.err:     at com.app.ifarma.SocketService$ClientThread.run(SocketService.java:272)

2018-11-16 11:54:45.923 6099-6131/com.app.ifarma W/System.err:     at java.lang.Thread.run(Thread.java:764)

2018-11-16 11:54:45.977 6099-6099/com.app.ifarma I/SocketService: quit:

2018-11-16 11:54:45.978 6099-6099/com.app.ifarma W/System.err: java.lang.NullPointerException: Attempt to invoke virtual method 'java.io.OutputStream java.net.Socket.getOutputStream()' on a null object reference

2018-11-16 11:54:45.979 6099-6099/com.app.ifarma W/System.err:     at com.app.ifarma.SocketService.closeConnection(SocketService.java:125)

2018-11-16 11:54:45.979 6099-6099/com.app.ifarma W/System.err:     at com.app.ifarma.SocketService.sendMessage(SocketService.java:115)

2018-11-16 11:54:45.979 6099-6099/com.app.ifarma W/System.err:     at com.app.ifarma.Scollega$2.run(Scollega.java:71)

2018-11-16 11:54:45.980 6099-6099/com.app.ifarma W/System.err:     at android.os.Handler.handleCallback(Handler.java:789)

2018-11-16 11:54:45.980 6099-6099/com.app.ifarma W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:98)

2018-11-16 11:54:45.980 6099-6099/com.app.ifarma W/System.err:     at android.os.Looper.loop(Looper.java:164)

2018-11-16 11:54:45.980 6099-6099/com.app.ifarma W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:6541)

2018-11-16 11:54:45.980 6099-6099/com.app.ifarma W/System.err:     at java.lang.reflect.Method.invoke(Native Method)

2018-11-16 11:54:45.980 6099-6099/com.app.ifarma W/System.err:     at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)

2018-11-16 11:54:45.981 6099-6099/com.app.ifarma W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)

this is my socketService(the problematic part):

@Override

    public void onCreate() {

        super.onCreate();

    }



    public void sendMessage(String message) {



        line = "";



        if (out != null && !out.checkError()) {

            out.println(message);

            out.flush();

            Log.i("SocketService", "" + message.toString());

            //ci aspettiamo una risposta solo se non e' quit

            if (message.equals("quit:")) {

                closeConnection();

            }



        }

    }



    public void closeConnection() {



        try {

            connect = false;

            socket.getOutputStream().close();

            socket.getInputStream().close();

            socket.close();

        } catch (UnknownHostException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        } catch (Exception e) {

            e.printStackTrace();

        }



        socket = null;

    }

Maybe also my "scollega" class has some problem

public class Scollega extends Activity {



    public SocketService s;

    //service

    boolean mBounded;

    ServiceConnection mConnection = new ServiceConnection() {



        public void onServiceDisconnected(ComponentName name) {

            mBounded = false;

            s = null;

        }



        public void onServiceConnected(ComponentName name, IBinder service) {

            mBounded = true;

            LocalBinder mLocalBinder = (LocalBinder) service;

            s = mLocalBinder.getServerInstance();

        }

    };



    ;



    @Override

    protected void onStart() {

        super.onStart();

        Intent mIntent = new Intent(this, SocketService.class);

        bindService(mIntent, mConnection, BIND_AUTO_CREATE);

    }



    @Override

    protected void onStop() {

        super.onStop();

        if (mBounded) {

            unbindService(mConnection);

            mBounded = false;

        }

    }



    ;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.loader);

        getWindow().setWindowAnimations(0);





        TextView outputView = (TextView) findViewById(R.id.textLoader);

        outputView.setText("Scollegamento...");



        //creiamo il timeout dopo l'avvio del servizio

        Handler handler = new Handler();

        handler.postDelayed(new Runnable() {



            @Override

            public void run() {



                try {

                    s.sendMessage("quit:");

                } catch (Exception e) {

                    e.printStackTrace();

                }





                //torniamo in Home

                Intent i = new Intent(Scollega.this, Home.class);

                i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);

                startActivity(i);

                overridePendingTransition(R.anim.slide_left, R.anim.slide_right);

                finish();

            }

        }, 1000); // ritardiamo l'esecuzione di un secondo



    }

I inherited this program from a person who no longer wants to deal with it, I solved most of the problems but I do not know how to do this part...