无法在尚未为天气应用程序调用 Looper.prepare() 的线程内创建处理程序

Question

我正在为一个学校项目制作一个天气应用程序，运行遇到了一个小问题。我看到很多人问这个问题，我尝试了很多答案，但对我没有用。我对这些东西真的很陌生，所以我可能没有正确实现这些答案。这是我的代码：

private void getWeatherInformation() {
    compositeDisposable.add(mService.getWeatherByLatLng(String.valueOf(APIKljuc.current_location.getLatitude()),
            String.valueOf(APIKljuc.current_location.getLongitude()),
            APIKljuc.APP_ID,
            "metric")
            .subscribeOn(Schedulers.io())
            .subscribe(new Consumer<WeatherResult>() {
                @Override
                public void accept(WeatherResult weatherResult) throws Exception {

                    //Slika
                    Picasso.get().load(new StringBuilder("https://openweathermap.org/img/w/")
                            .append(weatherResult.getWeather().get(0).getIcon())
                    .append(".png").toString()).into(img_weather);

                    //Ucitavanje informacija
                    txt_city_name.setText(weatherResult.getName());
                    txt_description.setText(new StringBuilder("Weather in")
                    .append(weatherResult.getName()).toString());
                    txt_temperature.setText(new StringBuilder(
                            String.valueOf(weatherResult.getMain().getTemp())).append("°C").toString());
                    txt_date_time.setText(APIKljuc.convertUnixToDate(weatherResult.getDt()));
                    txt_pressure.setText(new StringBuilder(String.valueOf(weatherResult.getMain().getPressure())).append(" hpa").toString());
                    txt_humidity.setText(new StringBuilder(String.valueOf(weatherResult.getMain().getHumidity())).append(" %").toString());
                    txt_sunrise.setText(APIKljuc.convertUnixToHour(weatherResult.getSys().getSunrise()));
                    txt_sundown.setText(APIKljuc.convertUnixToHour(weatherResult.getSys().getSunset()));
                    txt_geo_coords.setText(new StringBuilder("[").append(weatherResult.getCoord().toString()).append("]").toString());
                    txt_wind.setText(new StringBuilder().append(weatherResult.getCoord().toString()).append(" ").toString());

                    //Display panel
                    weather_panel.setVisibility(View.VISIBLE);
                    loading.setVisibility(View.GONE);


                }
            }, new Consumer<Throwable>() {
                @Override
                public void accept(Throwable throwable) throws Exception {
                    Toast.makeText(getActivity(), ""+throwable.getMessage(), Toast.LENGTH_LONG).show();
                }
            })

    );
}

我在网上看到的最推荐的答案是：

  activity.runOnUiThread(new Runnable() {
       public void run() { 
            Toast.makeText(activity, "Hello", Toast.LENGTH_SHORT).show();
    }
  });

我用它来替换：new Consumer() {etc..});

我不明白我需要用什么替换 'activity'，它是红色的，我的代码无法编译..

Answer 1

用它来移动线程

  .observeOn(AndroidSchedulers.mainThread())

我看到你用

.subscribeOn(Schedulers.io())

如果想要像 setText() 这样的操作视图，你需要移动到 mainThread

.observeOn(AndroidSchedulers.mainThread())
.subscribeOn(AndroidSchedulers.mainThread())
.subscribe(new Cus)

无法在尚未为天气应用程序调用 Looper.prepare() 的线程内创建处理程序

Can't create handler inside thread that has not called Looper.prepare() for weather app

java

android

handler

toast

looper