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public class TestActivity extends RxBaseActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_speed_test_new);
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl("https://www.speedtest.net/")
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .build();

        API api = retrofit.create(API.class);
        disposables.add(api.config()
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(responseBody -> {
                    Log.d(TAG, "result: " + responseBody.string());
                    ((TextView) findViewById(R.id.tv_test)).setText("Hello, World!");
                }));

    }

    interface API {
        @GET("api/android/config.php")
        Observable<ResponseBody> config();
    }
}