当前,我正在尝试使用viewmodel,并想知道是否将viewmodel传递给recyclerview适配器会导致内存泄漏?适配器中的viewmodel的唯一目的是提供要在活动中显示的图像的新URL
我不知道接口是更好的方法还是从recyclerview接收onclick事件?
这是我的代码:
Viewmodel:
public class WallDetailViewModel extends AndroidViewModel {
private final String apiAddress = "*";
private BlindWall detailWall;
private MutableLiveData<String> mainImageUrl;
public WallDetailViewModel(@NonNull Application application) {
super(application);
}
public LiveData<String> getMainImageUrl() {
if(mainImageUrl == null) {
mainImageUrl = new MutableLiveData<>();
mainImageUrl.postValue(getImageUrl(0));
}
return mainImageUrl;
}
public void setWall(BlindWall wall) {
detailWall = wall;
}
public String getImageUrl(int position) {
String returnValue = null;
if(position >= 0 && position < detailWall.getImagesUrls().size()) {
returnValue = apiAddress + detailWall.getImagesUrls().get(position);
}
return returnValue;
}
public String getWallName() {
return detailWall.getTitle();
}
public String getDutchDescription() {
return detailWall.getDescriptionDutch();
}
public String getEnglishDescription() {
return detailWall.getDescriptionEnglish();
}
public int getImageUrlSize() {
return detailWall.getImagesUrls().size();
}
public void setMainImage(String url) {
mainImageUrl.postValue(url);
}
}
适配器:
public class ImageSliderAdapter extends RecyclerView.Adapter<ImageSliderAdapter.ViewHolder2> {
private WallDetailViewModel viewModel;
public ImageSliderAdapter(WallDetailViewModel viewModel) {
this.viewModel = viewModel;
}
public static class ViewHolder2 extends RecyclerView.ViewHolder {
public ImageView WallFrontPaper;
public ViewHolder2(View itemView) {
super(itemView);
WallFrontPaper = itemView.findViewById(R.id.ImageItem);
}
}
@Override
public ViewHolder2 onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View v = inflater.inflate(R.layout.imageslider_item, parent, false);
return new ViewHolder2(v);
}
@Override
public void onBindViewHolder(ViewHolder2 holder, int position) {
Picasso.with(holder.itemView.getContext()).load(viewModel.getImageUrl(position)).fit().centerCrop().into(holder.WallFrontPaper);
holder.WallFrontPaper.setOnClickListener(view -> viewModel.setMainImage(viewModel.getImageUrl(position)));
}
@Override
public int getItemCount() {
return viewModel.getImageUrlSize();
}
}
谢谢
伊恩
答案 0 :(得分:0)
从您发布的代码来看,我应该没问题。但是,如前所述,拥有一个接口可以使事情变得更清晰,因为您可以将其传递给适配器,而无需暴露整个视图模型。
看这一点
.setOnClickListener(view -> viewModel.setMainImage(viewModel.getImageUrl(position)));
让我想知道您是否不能仅通过让视图模型知道已单击某个项目,因为您将再次使用视图模型来确定基于哪个图像URL作为参数传递,位置。
因此,如果使用接口,您将拥有类似setOnClickListener(view -> itemClickListener.itemClicked(position)
的名称。您的视图模型将实现此接口。