java - PostValue 可以工作，但 SetValue 不能 MutableLiveData - AndroidX

Question

在OnCreate中执行

public void Start() {
            ModelSingleHotTrendingNews modelSingleHotTrendingNewsX = ViewModelProviders.of(getActivity()).get(ModelSingleHotTrendingNews.class);
            modelSingleHotTrendingNewsX.gametitle.setValue("Start");
            modelSingleHotTrendingNewsX.likecounter.setValue(10);
            modelSingleHotTrendingNewsX.islike.setValue(10);
    }

当我按下Like按钮时执行

public void Finish() {
            ModelSingleHotTrendingNews modelSingleHotTrendingNewsX = ViewModelProviders.of(getActivity()).get(ModelSingleHotTrendingNews.class);
            modelSingleHotTrendingNewsX.gametitle.postValue("Finish");
            modelSingleHotTrendingNewsX.likecounter.postValue(11);
            modelSingleHotTrendingNewsX.islike.postValue(11);
    }

这是我的模型

public class ModelSingleHotTrendingNews extends ViewModel implements Serializable {

private String idcontent;
public MutableLiveData<String> gametitle = new MutableLiveData<>();

private String gamedate;
private String gameimage;
private String gamedescription;

private int seencounter;
private int commentcounter;
public MutableLiveData<Integer> likecounter = new MutableLiveData<>();

private int iscomment;
public MutableLiveData<Integer> islike = new MutableLiveData<>();
private int trendingnewssaving;

private String value;
private String message;



public ModelSingleHotTrendingNews() {
}

public ModelSingleHotTrendingNews(MutableLiveData<String> gametitle) {
    this.gametitle = gametitle;
}

public ModelSingleHotTrendingNews(String idcontent, String gamedate, String gameimage, String gamedescription, int seencounter, int commentcounter, int iscomment, int trendingnewssaving, String value, String message) {
    this.idcontent = idcontent;
    this.gamedate = gamedate;
    this.gameimage = gameimage;
    this.gamedescription = gamedescription;
    this.seencounter = seencounter;
    this.commentcounter = commentcounter;
    this.iscomment = iscomment;
    this.trendingnewssaving = trendingnewssaving;
    this.value = value;
    this.message = message;
}


public MutableLiveData<String> getGametitle() {
    gametitle.setValue(gametitle.getValue());
    return gametitle;
}

public void setGametitle(MutableLiveData<String> gametitle) {
    this.gametitle = gametitle;
}


public MutableLiveData<Integer> getLikecounter() {
    likecounter.setValue(likecounter.getValue());
    return likecounter;
}

public void setlikecounter(MutableLiveData<Integer> likecounter) {
    this.likecounter = likecounter;
}

public MutableLiveData<Integer> getIslike() {
    islike.setValue(islike.getValue());
    return islike;
}

public void setIslike(MutableLiveData<Integer> islike) {
    this.islike = islike;
}


public String getIdcontent() {
    return idcontent;
}

public void setIdcontent(String idcontent) {
    this.idcontent = idcontent;
}




public String getGamedate() {
    return gamedate;
}

public void setGamedate(String gamedate) {
    this.gamedate = gamedate;
}

public String getGameimage() {
    return gameimage;
}

public void setGameimage(String gameimage) {
    this.gameimage = gameimage;
}

public String getGamedescription() {
    return gamedescription;
}

public void setGamedescription(String gamedescription) {
    this.gamedescription = gamedescription;
}

public int getSeencounter() {
    return seencounter;
}

public void setSeencounter(int seencounter) {
    this.seencounter = seencounter;
}

public int getCommentcounter() {
    return commentcounter;
}

public void setCommentcounter(int commentcounter) {
    this.commentcounter = commentcounter;
}



public int getIscomment() {
    return iscomment;
}

public void setIscomment(int iscomment) {
    this.iscomment = iscomment;
}



public int getTrendingnewssaving() {
    return trendingnewssaving;
}

public void setTrendingnewssaving(int trendingnewssaving) {
    this.trendingnewssaving = trendingnewssaving;
}

public String getValue() {
    return value;
}

public void setValue(String value) {
    this.value = value;
}

public String getMessage() {
    return message;
}

public void setMessage(String message) {
    this.message = message;
}
}

这是适配器

public class AdapterSingleHotTrendingNews extends RecyclerView.Adapter{

private Context mContext;
private ArrayList<ModelSingleHotTrendingNews> modelSingleHotTrendingNews;

private RecyclerViewClickListener mListener;


public AdapterSingleHotTrendingNews(Context mContext, ArrayList<ModelSingleHotTrendingNews> modelSingleHotTrendingNews, RecyclerViewClickListener mListener) {
    this.mContext = mContext;
    this.modelSingleHotTrendingNews = modelSingleHotTrendingNews;
    this.mListener = mListener;
}




public void setmodelSingleHotTrendingNewsSD(ArrayList<ModelSingleHotTrendingNews> modelSingleHotTrendingNews) {
    this.modelSingleHotTrendingNews = modelSingleHotTrendingNews;
    notifyDataSetChanged();
}



//Container
@Override
public SingleHotTrendingNewsViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
    /*View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_single_hottrendingnews, null);
    return new SingleHotTrendingNewsViewHolder(v, mListener);*/


    View v;
    /*ModelSingleHotTrendingNews modelSingleHotTrendingNewsX;
        modelSingleHotTrendingNewsX = modelSingleHotTrendingNews.get(0);
        fragmentTabhotBinding.setRfg(modelSingleHotTrendingNewsX);*/
    final ItemSingleHottrendingnewsBinding itemSingleHottrendingnewsBinding;
    itemSingleHottrendingnewsBinding = DataBindingUtil.inflate(LayoutInflater.from(viewGroup.getContext()),
            R.layout.item_single_hottrendingnews, viewGroup, false);
    itemSingleHottrendingnewsBinding.setLifecycleOwner((FragmentActivity) mContext);

    final ModelSingleHotTrendingNews modelSingleHotTrendingNewsX;
    modelSingleHotTrendingNewsX = new ViewModelProvider((FragmentActivity) mContext).get(ModelSingleHotTrendingNews.class);
    modelSingleHotTrendingNewsX.gametitle.observe((FragmentActivity) mContext, new Observer<String>() {
        @Override
        public void onChanged(String s) {
            itemSingleHottrendingnewsBinding.TVGameTitle.setText(s);
        }
    });
    modelSingleHotTrendingNewsX.likecounter.observe((FragmentActivity) mContext, new Observer<Integer>() {
        @Override
        public void onChanged(Integer integer) {
            itemSingleHottrendingnewsBinding.TVLikeCounter.setText(String.valueOf(integer));
        }
    });
    modelSingleHotTrendingNewsX.islike.observe((FragmentActivity) mContext, new Observer<Integer>() {
        @Override
        public void onChanged(Integer integer) {
            if(integer == 0){
                itemSingleHottrendingnewsBinding.IMGLikeView.setImageResource(R.drawable.heart_off);
            }else if(integer == 1){
                itemSingleHottrendingnewsBinding.IMGLikeView.setImageResource(R.drawable.heart_on);
            }
        }
    });


    return new SingleHotTrendingNewsViewHolder(itemSingleHottrendingnewsBinding, mListener);
}


//Fill Container with Model Setter Getter
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {

    final SingleHotTrendingNewsViewHolder singleHotTrendingNewsViewHolder = (SingleHotTrendingNewsViewHolder) holder;
    final ModelSingleHotTrendingNews modelSingleHotTrendingNewsX = modelSingleHotTrendingNews.get(position);


    //Set
    singleHotTrendingNewsViewHolder.TVGameDate.setText(modelSingleHotTrendingNewsX.getGamedate());
    singleHotTrendingNewsViewHolder.TVGameTitle.setText(modelSingleHotTrendingNewsX.gametitle.getValue());
    Glide.with(mContext).load(modelSingleHotTrendingNewsX.getGameimage()).into(singleHotTrendingNewsViewHolder.IMGGameImage);
    /*singleHotTrendingNewsViewHolder.IMGGameImage.setImageResource(modelSingleHotTrendingNewsX.getGameimage());*/

    singleHotTrendingNewsViewHolder.TVSeenCounter.setText(String.valueOf(modelSingleHotTrendingNewsX.getSeencounter()));
    singleHotTrendingNewsViewHolder.TVCommentCounter.setText(String.valueOf(modelSingleHotTrendingNewsX.getCommentcounter()));
    singleHotTrendingNewsViewHolder.TVLikeCounter.setText(modelSingleHotTrendingNewsX.likecounter.getValue()));

    if (modelSingleHotTrendingNewsX.getIscomment() == 0) {
        singleHotTrendingNewsViewHolder.IMGCommentView.setImageResource(R.drawable.comment_off);
    } else if (modelSingleHotTrendingNewsX.getIscomment() == 1) {
        singleHotTrendingNewsViewHolder.IMGCommentView.setImageResource(R.drawable.comment_on);
    }

    /*if (modelSingleHotTrendingNewsX.islike.getValue() != null){
        if (modelSingleHotTrendingNewsX.islike.getValue().equals(0)) {
            singleHotTrendingNewsViewHolder.IMGLikeView.setImageResource(R.drawable.heart_off);
        } else if (modelSingleHotTrendingNewsX.islike.getValue().equals(1)) {
            singleHotTrendingNewsViewHolder.IMGLikeView.setImageResource(R.drawable.heart_on);
        }
    }*/

    if(modelSingleHotTrendingNewsX.getTrendingnewssaving() == 0) {
        singleHotTrendingNewsViewHolder.ICONHotTrendingNewsSaving.setImageResource(R.drawable.saved_off);
        singleHotTrendingNewsViewHolder.ICONHotTrendingNewsSaving.setVisibility(View.GONE);
    }else if(modelSingleHotTrendingNewsX.getTrendingnewssaving() == 1) {
        singleHotTrendingNewsViewHolder.ICONHotTrendingNewsSaving.setImageResource(R.drawable.saved_on);
    }

    singleHotTrendingNewsViewHolder.ICONHotTrendingNewsSaving.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            final int booltrendingnewssaving = modelSingleHotTrendingNewsX.getTrendingnewssaving();

            final String idcontent = modelSingleHotTrendingNewsX.getIdcontent();

            if (booltrendingnewssaving == 1){
                Toast.makeText(v.getContext(), "Turn Off Saved News " + idcontent, Toast.LENGTH_SHORT).show();
                singleHotTrendingNewsViewHolder.ICONHotTrendingNewsSaving.setImageResource(R.drawable.saved_off);
                modelSingleHotTrendingNewsX.setTrendingnewssaving(0);
                /*updateSavedNewsSaving("update_newssaving", id, false);*/
            } else if(booltrendingnewssaving == 0) {
                Toast.makeText(v.getContext(), "Turn On Saved News " + idcontent, Toast.LENGTH_SHORT).show();
                singleHotTrendingNewsViewHolder.ICONHotTrendingNewsSaving.setImageResource(R.drawable.saved_on);
                modelSingleHotTrendingNewsX.setTrendingnewssaving(1);
                /*updateSavedNewsSaving("update_newssaving", id, true);*/
            }
        }
    });



   /* Glide.with(mContext)
            .load(feedItem.getImageURL())
            .diskCacheStrategy(DiskCacheStrategy.ALL)
            .centerCrop()
            .error(R.drawable.bg)
            .into(feedListRowHolder.thumbView);*/

    /*singleHotTrendingNewsViewHolder.ROWHotTrendingNewsContainer.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(v.getContext(), modelSingleHotTrendingNews.get(position).getGamedescription(), Toast.LENGTH_SHORT).show();

            //Passing Data to GameDescriptionActivity
            Intent intent = new Intent(mContext, GameDetailActivity.class);
            intent.putExtra("ImagePKG",  modelSingleHotTrendingNews.get(position).getGameimage());
            intent.putExtra("NamePKG",  modelSingleHotTrendingNews.get(position).getGamedate());
            intent.putExtra("UrlPKG",  modelSingleHotTrendingNews.get(position).getIdcontent());
            intent.putExtra("DescriptionPKG",  modelSingleHotTrendingNews.get(position).getGametitle());
            mContext.startActivity(intent);
        }
    });*/
}

@Override
public int getItemCount() {
    int itemCount = modelSingleHotTrendingNews.size();
    return itemCount;
}

public void setmodelSingleHotTrendingNews(ArrayList<ModelSingleHotTrendingNews> modelSingleHotTrendingNews) {
    this.modelSingleHotTrendingNews = modelSingleHotTrendingNews;
    notifyDataSetChanged();
}

public class SingleHotTrendingNewsViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
    TextView TVGameDate;
    TextView TVGameTitle;
    ImageView IMGGameImage;

    TextView TVSeenCounter;
    TextView TVCommentCounter;
    TextView TVLikeCounter;

    ImageView IMGSeenView;
    ImageView IMGCommentView;
    ImageView IMGLikeView;

    ImageView ICONHotTrendingNewsSaving;
    private RelativeLayout ROWHotTrendingNewsContainer;

    private RecyclerViewClickListener mListener;

    //
    private ItemSingleHottrendingnewsBinding itemSingleHottrendingnewsBinding;

    ModelSingleHotTrendingNews modelSingleHotTrendingNewsZ;


    public SingleHotTrendingNewsViewHolder(ItemSingleHottrendingnewsBinding itemSingleHottrendingnewsBinding, RecyclerViewClickListener listener) {
        super(itemSingleHottrendingnewsBinding.getRoot());

        this.itemSingleHottrendingnewsBinding = itemSingleHottrendingnewsBinding;

        TVGameDate = itemView.findViewById(R.id.TV_GameDate);
        TVGameTitle = itemView.findViewById(R.id.TV_GameTitle);
        IMGGameImage = itemView.findViewById(R.id.IMG_GameImage);

        TVSeenCounter = itemView.findViewById(R.id.TV_SeenCounter);
        TVCommentCounter = itemView.findViewById(R.id.TV_CommentCounter);
        TVLikeCounter = itemView.findViewById(R.id.TV_LikeCounter);

        IMGSeenView = itemView.findViewById(R.id.IMG_SeenView);
        IMGCommentView = itemView.findViewById(R.id.IMG_CommentView);
        IMGLikeView = itemView.findViewById(R.id.IMG_LikeView);

        ICONHotTrendingNewsSaving = itemView.findViewById(R.id.ICON_HotTrendingNewsSaving);
        ROWHotTrendingNewsContainer = itemView.findViewById(R.id.ROW_HotTrendingNewsContainer);

        mListener = listener;
        ROWHotTrendingNewsContainer.setOnClickListener(this);
        IMGCommentView.setOnClickListener(this);
        IMGLikeView.setOnClickListener(this);

        //
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.ROW_HotTrendingNewsContainer:
                mListener.onRowHotTrendingNewsContainerClick(ROWHotTrendingNewsContainer, getAdapterPosition());
                break;
            case R.id.IMG_CommentView:
                mListener.onRowCommentViewClick(IMGCommentView, getAdapterPosition());
                break;
            case R.id.IMG_LikeView:
                mListener.onRowLikeViewClick(IMGLikeView, getAdapterPosition());
                break;
            default:
                break;
        }
    }
}

public interface RecyclerViewClickListener {
    void onRowHotTrendingNewsContainerClick(View view, int position);
    void onRowCommentViewClick(View view, int position);
    void onRowLikeViewClick(View view, int position);
}

}我不知道为什么函数 start 中的 setValue 没有将值设置为 10，而是设置为 0当我尝试 PostValue 时，数字按我的预期更新为 11哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈)

Answer 1

我已经找到答案了，只是在OnBindViewHolder中修改

来自

ModelSingleHotTrendingNews modelSingleHotTrendingNewsX = modelSingleHotTrendingNews.get(position);
    singleHotTrendingNewsViewHolder.TVLikeCounter.setText(String.valueOf(modelSingleHotTrendingNewsX.likecounter.getValue()));

至

ModelSingleHotTrendingNews modelSingleHotTrendingNewsZ;
    modelSingleHotTrendingNewsZ = new ViewModelProvider((FragmentActivity) mContext).get(ModelSingleHotTrendingNews.class);
    singleHotTrendingNewsViewHolder.TVLikeCounter.setText(String.valueOf(modelSingleHotTrendingNewsZ.likecounter.getValue()));

谢谢