Help with Retrofit, PUT and DELETE methods

I am obliged to put all the code given that I can not find a solution to this, and I have already seen several questions with the same subject, but not even that way. PUT and DELETE do not walk me.

I have these classes on Android

-RetrofiCliente.java

public class RetrofitCliente {

    private static Retrofit retrofit = null;

    public static Retrofit getClient(String url){
        if(retrofit == null){

            retrofit = new Retrofit.Builder().baseUrl(url)
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();
        }

        return retrofit;
    }
}

-APIUtils.java

public class APIUtils {

    private APIUtils(){
    };

    public static final String API_URL = "http://10.51.1.136:100/api/";

    public static ClienteService getUserService(){
        return RetrofitCliente.getClient(API_URL).create(ClienteService.class);
    }
}

-ClientService.java

public interface ClienteService {

    @GET("prueba/{id}/")
    Call<List<Cliente>> listRepos(@Path("id") String user);

    @GET("prueba")
    Call<List<Cliente>> getCliente();

    @POST("prueba/agregar")
    Call<Cliente> insertCliente(@Body Cliente cliente);

    @PUT("/prueba/actualizar/{id}/")
    Call<Cliente> updateCliente(@Path("id") int id, @Body Cliente cliente);

    @DELETE("/prueba/eliminar/{id}/")
    Call<Cliente> deleteCliente(@Path("id") int id);
}

-ClientActivity

public class ClienteActivity extends AppCompatActivity {

    ClienteService clienteService;
    EditText edtUId;
    EditText edtNombre;
    EditText edtApellido;
    Button btnSave;
    Button btnDel;
    TextView txtUId;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_cliente);

        setTitle("Users");
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        txtUId = (TextView) findViewById(R.id.txtUId);
        edtUId = (EditText) findViewById(R.id.edtUId);
        edtNombre = (EditText) findViewById(R.id.edtUsername);
        edtApellido = (EditText) findViewById(R.id.edtApellido);
        btnSave = (Button) findViewById(R.id.btnSave);
        btnDel = (Button) findViewById(R.id.btnDel);

        clienteService = APIUtils.getUserService();

        Bundle extras = getIntent().getExtras();
        final String userId = extras.getString("id");
        String nombre = extras.getString("nombre");
        String apellido = extras.getString("apellido");

        edtUId.setText(userId);
        edtNombre.setText(nombre);
        edtApellido.setText(apellido);

        if(userId != null && userId.trim().length() > 0 ){
             edtUId.setFocusable(false);
        } else {
            txtUId.setVisibility(View.INVISIBLE);
            edtUId.setVisibility(View.INVISIBLE);
            btnDel.setVisibility(View.INVISIBLE);
        }

        btnSave.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Cliente u = new Cliente();
                u.setNombre(edtNombre.getText().toString());
                u.setApellido(edtApellido.getText().toString());
                if(userId != null && userId.trim().length() > 0){
                    //update user
                    updateUser(Integer.parseInt(userId), u);
                } else {
                    //add user
                    addUser(u);
                }
            }
        });

        btnDel.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                deleteUser(Integer.parseInt(userId));

                Intent intent = new Intent(ClienteActivity.this, MainActivity.class);
                 startActivity(intent);
            }
        });

    }

    public void addUser(Cliente u){
        Call<Cliente> call = clienteService.insertCliente(u);
        call.enqueue(new Callback<Cliente>() {
            @Override
            public void onResponse(Call<Cliente> call, Response<Cliente> response) {
                if(response.isSuccessful()){
                    Toast.makeText(ClienteActivity.this, "Client created successfully!", Toast.LENGTH_SHORT).show();
                }
            }

            @Override
            public void onFailure(Call<Cliente> call, Throwable t) {
                Log.e("ERROR: ", t.getMessage());
            }
        });
    }

    public void updateUser(int id, Cliente u){
        Call<Cliente> call = clienteService.updateCliente(id, u);
        call.enqueue(new Callback<Cliente>() {
            @Override
            public void onResponse(Call<Cliente> call, Response<Cliente> response) {
                if(response.isSuccessful()){
                    Toast.makeText(ClienteActivity.this, "Client updated successfully!", Toast.LENGTH_SHORT).show();
                }
            }

            @Override
            public void onFailure(Call<Cliente> call, Throwable t) {
                Log.e("ERROR: ", t.getMessage());
            }
        });
    }

    public void deleteUser(int id){
        Call<Cliente> call = clienteService.deleteCliente(id);
        call.enqueue(new Callback<Cliente>() {
            @Override
            public void onResponse(Call<Cliente> call, Response<Cliente> response) {
                if(response.isSuccessful()){
                    Toast.makeText(ClienteActivity.this, "Client deleted successfully!", Toast.LENGTH_SHORT).show();
                }
            }

            @Override
            public void onFailure(Call<Cliente> call, Throwable t) {
                Log.e("ERROR: ", t.getMessage());
            }
        });
    }
}

I must indicate that I did this while following a video and adapted it to my needs, and I have already repeated it several times to try to find my error, only GET and POST work, but when I give UPDATE in the log it does not He shows me nothing but still does not update anything and when I give him DELETE he shows me this.

  

E / Editor: hideClipTrayIfNeeded () TextView is focused !! hideClipTray ()