绑定视图持有者不在适配器中运行

Question

我有一个奇怪的问题。 我想在RecyclerView展示一些产品。 我将列表传递给适配器以显示。 在适配器的构造函数中，列表已设置，但不会调用其他方法。 在我调试时，列表已设置，但没有其他任何事情发生，也不会显示任何内容

这是我的适配器代码：

public class SearchItemAdapter extends RecyclerView.Adapter<SearchItemAdapter.SearchViewHolder> {
    List<Product> products;
    public SearchItemAdapter(){
        products=new ArrayList<>();
    }
    @NonNull
    @Override
    public SearchViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view= LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.search_item,viewGroup,false);
        return new SearchViewHolder(view);
    }

    public void onbind(List<Product> products){
        this.products=products;
        notifyDataSetChanged();
    }

    @Override
    public void onBindViewHolder(@NonNull SearchViewHolder searchViewHolder, int i) {
        Product product= products.get(i);
        Picasso.get().load(product.getPic()).into(searchViewHolder.image);
        searchViewHolder.txtTitle.setText(product.getTitle());
        searchViewHolder.txtDesc.setText(product.getTitle());
    }

    @Override
    public int getItemCount() {
        return products.size();
    }

    public class SearchViewHolder extends RecyclerView.ViewHolder {
        ImageView image;
        TextView txtTitle,txtDesc;
        public SearchViewHolder(@NonNull View itemView) {
            super(itemView);
            txtTitle=itemView.findViewById(R.id.txt_searchItem_title);
            txtDesc=itemView.findViewById(R.id.txt_searchItem_desc);
            image=itemView.findViewById(R.id.img_searchItem_image);
        }
    }
}

和活动代码：

public class CompareSearchActivity extends AppCompatActivity {

    CompareViewModel viewModel=new CompareViewModel();
    CompositeDisposable compositeDisposable=new CompositeDisposable();
    EditText edtSearch;
    ProgressBar progressBar;
    ImageView imgClose;
    RecyclerView recyclerView;
    SearchItemAdapter searchItemAdapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_compare_search);
        setupViews();
    }

    private void setupViews() {
        recyclerView=findViewById(R.id.rv_compareSearch_searchedProduct);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        searchItemAdapter=new SearchItemAdapter();
        recyclerView.setAdapter(searchItemAdapter);
        imgClose=findViewById(R.id.img_compareSearch_close);
        imgClose.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });
        edtSearch=findViewById(R.id.edt_compareSearch_serach);
        edtSearch.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                progressBar.setVisibility(View.VISIBLE);
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                viewModel.getSearchedProduct(String.valueOf(s))
                        .subscribeOn(Schedulers.newThread())
                        .observeOn(AndroidSchedulers.mainThread())
                        .subscribe(new SingleObserver<List<Product>>() {
                            @Override
                            public void onSubscribe(Disposable d) {
                                compositeDisposable.add(d);
                            }

                            @Override
                            public void onSuccess(List<Product> products) {
                                progressBar.setVisibility(View.GONE);
                                searchItemAdapter.onbind(products);
                            }

                            @Override
                            public void onError(Throwable e) {
                                Log.i("LOG", "onError: "+e.toString());
                            }
                        });
            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });
        progressBar=findViewById(R.id.progress_compareSearch);
    }
}

Answer 1

您忘记了RecyclerView来设置适配器

recyclerView.setAdapter（searchItemAdapter）;

并更改代码以及如下所示

public void onbind(List<Product> products){
    this.products.clear();
    this.products.addAll(products);
    notifyDataSetChanged();
}

设置适配器如下

private void setupViews() {
        recyclerView=findViewById(R.id.rv_compareSearch_searchedProduct);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        searchItemAdapter=new SearchItemAdapter();

        // Here is the adapter
        recyclerView.setAdapter(searchItemAdapter);

        imgClose=findViewById(R.id.img_compareSearch_close);
        imgClose.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });
        edtSearch=findViewById(R.id.edt_compareSearch_serach);
        edtSearch.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                progressBar.setVisibility(View.VISIBLE);
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                viewModel.getSearchedProduct(String.valueOf(s))
                        .subscribeOn(Schedulers.newThread())
                        .observeOn(AndroidSchedulers.mainThread())
                        .subscribe(new SingleObserver<List<Product>>() {
                            @Override
                            public void onSubscribe(Disposable d) {
                                compositeDisposable.add(d);
                            }

                            @Override
                            public void onSuccess(List<Product> products) {
                                progressBar.setVisibility(View.GONE);
                                searchItemAdapter.onbind(products);
                            }

                            @Override
                            public void onError(Throwable e) {
                                Log.i("LOG", "onError: "+e.toString());
                            }
                        });
            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });
        progressBar=findViewById(R.id.progress_compareSearch);
    }
}

Answer 2

我不清楚这一点，但我有一个建议给你

而不是使用viewgroup.getContext() ，在适配器中传递活动上下文，如下所示，

List<Product> products;
Context context;
public SearchItemAdapter(Context context){
    this.context = context;
    products=new ArrayList<>();
}

并使用上下文，

希望你的问题解决。