Enqueue callback not called

Question

I am using retrofit2 and recognized that sometimes the callback for Call.enqueue is not called.

Retrofit retrofit = new Retrofit.Builder().baseUrl(usuarioService.BASE_URL).addConverterFactory(GsonConverterFactory.create(usuarioService.g)).build();
usuarioService service = retrofit.create(usuarioService.class);
Call<String> user = service.verificarUsuario(login.getText().toString(), senha.getText().toString());
user.enqueue(new retrofit2.Callback<String>() {
    @Override
    public void onResponse(Call<String> call, Response<String> response) {
        String resultado = response.body();

        if (resultado.equals("false")) {
            Toast toast = Toast.makeText(MainActivity.this, "Senha ou usuário não existente", Toast.LENGTH_SHORT);
            toast.setGravity(Gravity.TOP | Gravity.CENTER_VERTICAL, 0, 0);
            toast.show();
        } else {
            if (resultado.equals("true")) {
                Toast toast = Toast.makeText(MainActivity.this, "ACESSO PERMITIDO", Toast.LENGTH_SHORT);
                toast.setGravity(Gravity.CENTER_HORIZONTAL | Gravity.CENTER_VERTICAL, 0, 0);
                toast.show();

                Intent intent = new Intent(MainActivity.this, MenuDrawer.class);
                intent.putExtra("chave1", login.getText().toString());

                startActivity(intent);

                finish();
            }
        }
    }

    @Override
    public void onFailure(Call<String> call, Throwable t) {
    }
});

Suddenly that problem start to happen, does anybody knows how to fix it? These issue do not happen until some moments ago, I do not know what happened.

These happened just when i'm using mobile data, but when i'm used WIFI these never happened yet.

Answer 1

You have empty onFailure implementation so callback may be called but nothing happens. Try to log some information in onFailure method.

@Override
public void onFailure(Call<String> call, Throwable t) {
   Log.w("MyTag", "requestFailed", t); 
}

And you'll see if request failed and why.