我需要什么才能使用retrofit android成功获得GET请求？

public interface ApiService {
    @GET("api/endpoint")
    Call<ResponseBody> getData();
}

Retrofit retrofit = new Retrofit.Builder()
    .baseUrl("https://api.example.com/")
    .build();

ApiService apiService = retrofit.create(ApiService.class);

Call<ResponseBody> call = apiService.getData();
call.enqueue(new Callback<ResponseBody>() {
    @Override
    public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
        // 处理响应数据
    }

    @Override
    public void onFailure(Call<ResponseBody> call, Throwable t) {
        // 处理请求失败
    }
});