Problem when creating socket in android to server on pc

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Problem when creating socket in android to server on pc

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#1 by (1 votes)

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I am doing a chat for a project in the grade I am in, I already have a client and server that work in java on the PC.

Now I wanted to make a client in mobile version. The point is that I am stuck in the creation of the socket , since it throws me for a generic exception and I can not make it work. I'll stick the client code to see if you can help me out:

public class chat extends AppCompatActivity {
    private Socket socket;
    private TextView tvChat;
    private EditText etMensaje;
    private String mensaje;
    private int puerto;
    private InetAddress ip;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_chat);
        tvChat =(TextView)findViewById(R.id.tvChat);
        tvChat.setText("");
        etMensaje = (EditText)findViewById(R.id.etMensaje);
            tvChat.setMovementMethod(new ScrollingMovementMethod());
        String temp;
        Intent intent = getIntent();
        Bundle extras = intent.getExtras();
        if (extras != null){
            temp = (String)extras.get("IP");
            try {
                ip=InetAddress.getByName(temp);
            } catch (UnknownHostException e) {
                e.printStackTrace();
            }
            tvChat.append(ip.toString());
            p=Integer.parseInt((String)extras.get("Puerto"));
            tvChat.append(String.valueOf(p));
        }
        Runtime runtime = Runtime.getRuntime();
        try{
            Process mIpAddrProcess = runtime.exec("/system/bin/ping -c 1 192.168.1.137");
            int mExitValue = mIpAddrProcess.waitFor();
            if (mExitValue == 0){
                tvChat.append("Ha salido bien");
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            socket = new Socket(ip,p);
        } catch (UnknownHostException uhe){
            Toast.makeText(this, "La ip no apunta a ningun servidor disponible. " + uhe.getMessage(), Toast.LENGTH_LONG).show();
        } catch (IOException ioe){
            Toast.makeText(this, "Error de entrada y salida. "+ ioe.getMessage(),Toast.LENGTH_LONG).show();
        } catch (Exception e){
            Toast.makeText(this, "Error genérico. "+ e.getMessage(), Toast.LENGTH_LONG).show();
        }
    }

The funny thing is that by executing it on the mobile, the ping does it to me, but it does not connect ...

java android excepciones socket

asked by walkerdeath 09.11.2017 в 20:41

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1 answer

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score 1 · Answer 1

You can not establish the connection from the main thread , to prevent the UI from freezing, you have to launch the connection from a secondary thread.

An asynchronous task (Asyncasck) is defined by a calculation that runs on a secondary thread and whose result we want to be published in the user interface thread.

Add permission on your Manifest.

<uses-permission android:name="android.permission.INTERNET" />

Create a class by extending the AsyncTask class:

private class Conectar extends AsyncTask<String, Void, Boolean> {


        @Override
        protected Boolean doInBackground(String... params) {

           SERVER_IP = params[0];
           SERVER_PORT = params[1];
           TIME_OUT = params[2];


            try {
                socket = new Socket();
                socket.connect(new InetSocketAddress(SERVER_IP, Integer.valueOf(SERVER_PORT)), Integer.valueOf(TIME_OUT));
                Log.v(TAG,"Socket conectado");

                return true;
            } catch (IOException ex) {
                Log.v(TAG,"Socket NO conectado");
                return false;
            }

        }


    }

Establish a procedure to call that class.

private Conectar mCon = null;

private boolean setConectar(String IP, String Puerto, String TimeOut){

        mCon = new Conectar();
        mCon.execute(IP,Puerto,TimeOut);//En milisegundos

        try {

            if(mCon.get(TIME_OUT, TimeUnit.MILLISECONDS)) {
                return true;
            }else{
                return false;
            }

        } catch (TimeoutException | InterruptedException | ExecutionException e) {
            e.printStackTrace();
            return false;
        }

    }

In the part of your code call setCoenctar ().

if(setConectar("xxx.xxx.xxx.xxx","3333","5000")){
   //Si esta conectado haga algo
}