如何在兩個片段之間傳遞數據而沒有任何按鈕？

Question

我在底部導航之間移動了兩個片段。 我想在它們之間傳遞沒有任何按鈕的數據。 看起來是這樣的：在第一個片段中，我在編輯文本中包含字符串，然后轉到另一個片段，我想將此字符串傳遞給該片段中的文本視圖。

第一個片段：

 public class TodayFragment extends Fragment {


@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    FragmentTodayBinding fragmentTodayBinding = DataBindingUtil.inflate(inflater,R.layout.fragment_today, null, false);
    View view = fragmentTodayBinding.getRoot();
    TodayViewModel todayViewModel = ViewModelProviders.of(this).get(TodayViewModel.class);
    fragmentTodayBinding.setTodayViewModel(todayViewModel);

    fragmentTodayBinding.setTodayFragmentInterface(new TodayFragmentInterface() {
        @Override
        public void onSearchClick(View v) {
            todayViewModel.getCity();
        }
    });

    todayViewModel.getWeather().observe(getViewLifecycleOwner(), new Observer<Weather>() {
        @Override
        public void onChanged(Weather weather) {
            fragmentTodayBinding.windTextView.setText("Wind: " + String.valueOf(weather.getWind().getSpeed()) + " km/h");
            fragmentTodayBinding.humidityTextView.setText("Humidity: " + weather.getMain().getHumidity() + " %");
            fragmentTodayBinding.pressureTextView.setText("Pressure: " + weather.getMain().getPressure() + " mBar");
            Double temp = weather.getMain().getTemp();
            DecimalFormat df = new DecimalFormat("#0.0");
            fragmentTodayBinding.tempTextView.setText(df.format(temp) + " ℃");
            String desc = weather.getDescription();
            String desc2 = Character.toString(desc.charAt(0)).toUpperCase()+desc.substring(1);
            fragmentTodayBinding.conditionTextView.setText(desc2);
            Glide.with(TodayFragment.this).load(weather.getIconUrl()).into(fragmentTodayBinding.iconImageView);
        }
    });

    return view;
}

第二個片段：

public class HourlyFragment extends Fragment {


@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    FragmentHourlyBinding fragmentHourlyBinding = DataBindingUtil.inflate(inflater,R.layout.fragment_hourly, null, false);
    View view = fragmentHourlyBinding.getRoot();
    HourlyViewModel hourlyViewModel = ViewModelProviders.of(this).get(HourlyViewModel.class);

    List<String> data = new ArrayList<>();

    RecyclerView recyclerView = view.findViewById(R.id.recycler_view);
    recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
    final RecyclerViewAdapter recyclerViewAdapter = new RecyclerViewAdapter(getActivity(), data);
    recyclerView.setAdapter(recyclerViewAdapter);


    return view;
}

}

Answer 1

這是有關如何與片段進行通信的官方文檔 。 有多種方法可以做到這一點。 您可以使用接口方法，可以使用像GreenRobot這樣的EventBus，也可以使用LiveData 。