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How to use retrofit for Java server socket connection.
My server having JAVA Server Socket.
and wanted to send request from android using Retrofit.
How to make connection and send - received data over Java socket

Here is the way that you can connect to your web service through Retrofit library. You can use this sample to do all ever you want:

1-First you need create a communicator class(to do all send-receive process)

public class Communicator {

    private static  final String TAG = "Communicator";

    private static final String SERVER_URL = "http://127.0.0.1/retrofit";



     public void loginPost(String username, String password){



        //Here a logging interceptor is created

        HttpLoggingInterceptor logging = new HttpLoggingInterceptor();

        logging.setLevel(HttpLoggingInterceptor.Level.BODY);



        //The logging interceptor will be added to the http client

        OkHttpClient.Builder httpClient = new OkHttpClient.Builder();

        httpClient.addInterceptor(logging);



        //The Retrofit builder will have the client attached, in order to get connection logs

        Retrofit retrofit = new Retrofit.Builder()

                .client(httpClient.build())

                .addConverterFactory(GsonConverterFactory.create())

                .baseUrl(SERVER_URL)

                .build(); Interface service = retrofit.create(Interface.class);



        Call<ServerResponse> call = service.post("login",username,password);



        call.enqueue(new Callback<ServerResponse>() {

            @Override

            public void onResponse(Call<ServerResponse> call, Response<ServerResponse> response) {

                BusProvider.getInstance().post(new ServerEvent(response.body()));

                Log.e(TAG,"Success");

            }



            @Override

            public void onFailure(Call<ServerResponse> call, Throwable t) {

                // handle execution failures like no internet connectivity

                BusProvider.getInstance().post(new ErrorEvent(-2,t.getMessage()));

            }

        });

    }



    public void loginGet(String username, String password){

        //Here a logging interceptor is created

        HttpLoggingInterceptor logging = new HttpLoggingInterceptor();

        logging.setLevel(HttpLoggingInterceptor.Level.BODY);



        //The logging interceptor will be added to the http client

        OkHttpClient.Builder httpClient = new OkHttpClient.Builder();

        httpClient.addInterceptor(logging);



        //The Retrofit builder will have the client attached, in order to get connection logs

        Retrofit retrofit = new Retrofit.Builder()

                .client(httpClient.build())

                .addConverterFactory(GsonConverterFactory.create())

                .baseUrl(SERVER_URL)

                .build();



        Interface service = retrofit.create(Interface.class);



        Call<ServerResponse> call = service.get("login",username,password);



        call.enqueue(new Callback<ServerResponse>() {

            @Override

            public void onResponse(Call<ServerResponse> call, Response<ServerResponse> response) {

                BusProvider.getInstance().post(new ServerEvent(response.body()));

                Log.e(TAG,"Success");

            }



            @Override

            public void onFailure(Call<ServerResponse> call, Throwable t) {

                // handle execution failures like no internet connectivity

                BusProvider.getInstance().post(new ErrorEvent(-2,t.getMessage()));

            }

        });

    }

both of top methods are used for send username and password to the server for authentication.

2-Second you should use communicator class inside your activity:

public class MainActivity extends AppCompatActivity {



    private Communicator communicator;

    private String username, password;

    private EditText usernameET, passwordET;

    private Button loginButtonPost, loginButtonGet;

    private TextView information, extraInformation;

    private final static String TAG = "MainActivity";

    public static Bus bus;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);



        communicator = new Communicator();



        usernameET = (EditText)findViewById(R.id.usernameInput);

        passwordET = (EditText)findViewById(R.id.passwordInput);

        //This is used to hide the password's EditText characters. So we can avoid the different hint font.

      passwordET.setTransformationMethod(new PasswordTransformationMethod());



        loginButtonPost = (Button)findViewById(R.id.loginButtonPost);

        loginButtonPost.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                username = usernameET.getText().toString();

                password = passwordET.getText().toString();

                usePost(username, password);

            }

        });



        loginButtonGet = (Button)findViewById(R.id.loginButtonGet);

        loginButtonGet.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                username = usernameET.getText().toString();

                password = passwordET.getText().toString();

                useGet(username, password);

            }

        });



        information = (TextView)findViewById(R.id.information);

        extraInformation = (TextView)findViewById(R.id.extraInformation);

    }



    private void usePost(String username, String password){

        communicator.loginPost(username, password);

        }



    private void useGet(String username, String password){

        communicator.loginGet(username, password);

    }

}

in the onCreate method we created an instance of communicator class and called useGet and usePost methods to send entered username and password to the server.

3-Don't forget to add library dependencies(add this codes into your build.gradle(Module:app) file:

compile 'com.squareup.okhttp3:logging-interceptor:3.4.0'

compile 'com.squareup.retrofit2:retrofit:2.1.0'

compile 'com.squareup.retrofit2:converter-gson:2.1.0'

compile 'com.squareup:otto:1.3.8'

compile 'com.google.code.gson:gson:2.6.2'