[Android | Java] ViewModel을 이용하여 프래그먼트 간 데이터 전송

ViewModel을 이용한 Fragment 간의 데이터 전송 방법

검색하다가 코틀린 코드만 나오고 자바는 잘 안나와서 너무 힘들었다

그래서 블로그에 기록해서 널리널리 퍼트리기 👽🌏👍

 

SEND

       SharedViewModel searchViewModel = new ViewModelProvider(requireActivity()).get(SharedViewModel.class);
       binding.allList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                searchViewModel.sendMessage(CityName[i]);
                activity.changeFragment(5);
            }
        });

RECEIVE

        final Observer<String> selectObserver = new Observer<String>() {
            @Override
            public void onChanged(@Nullable final String s) {
                spinnerBtn.setText(s);
            }
        };

        SharedViewModel searchViewModel = new ViewModelProvider(requireActivity()).get(SharedViewModel.class);
        searchViewModel.getMessage().observe(getViewLifecycleOwner(), selectObserver);

VIEWMODEL

package com.example.zaevtour.ui.search;

import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.ViewModel;
import kotlin.Metadata;
import kotlin.jvm.internal.Intrinsics;
import org.jetbrains.annotations.NotNull;

public final class SharedViewModel extends ViewModel {
    @NotNull
    private final MutableLiveData message = new MutableLiveData();

    @NotNull
    public final MutableLiveData getMessage() {
        return this.message;
    }

    public final void sendMessage(@NotNull String text) {
        Intrinsics.checkNotNullParameter(text, "text");
        this.message.setValue(text);
    }
}