Question

我正在使用翻新来搜索图像并显示。我正在使用SearchView进行搜索，recyclerview和适配器来显示该项目。

这是第一次工作。第二次搜索时，它显示的是同一项目。它不会清除要显示的视图。

这是我的代码：

document.querySelectorAll('[name^="dropDown"]').forEach(function(node) {console.log(node.options[node.selectedIndex].value);});

在这里我需要重置以搜索新项目，以避免显示上一个项目。列表未清除以显示新项目。

这是适配器类：

    public class MainActivity extends AppCompatActivity {
        private static final String TAG = MainActivity.class.getName();
        ImagesViewModel newsViewModel;
        List<Hits> newsArticles;
        List<Hits> articleArrayList;
        ImagesAdapter newsAdapter;
        RecyclerView rvHeadline;
        SearchView searchView;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            rvHeadline = (RecyclerView) findViewById(R.id.rvNews);
            searchView=(SearchView) findViewById(R.id.searchView);
            searchView.setQueryHint("Search Images");
            searchView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    searchView.setIconified(false);
                }
            });
            searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {

                @Override
                public boolean onQueryTextSubmit(String query) {
                    callPixabayImages(query);
                    Toast.makeText(getBaseContext(), query, Toast.LENGTH_LONG).show();
                    return false;
                }

                @Override
                public boolean onQueryTextChange(String newText) {
                    callPixabayImages(newText);
                    Toast.makeText(getBaseContext(), newText, Toast.LENGTH_LONG).show();
                    return false;
                }
            });
            articleArrayList = new ArrayList<>();
 }

 private void callPixabayImages(String query){
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(ImageApiInterface.PIXABAY_URL)
                .addConverterFactory(GsonConverterFactory.create()) //Here we are using the GsonConverterFactory to directly convert json data to object
                .build();

        ImageApiInterface api = retrofit.create(ImageApiInterface.class);

        Call<MyImages> call = api.getMovieDetails(query);
        call.enqueue(new Callback<MyImages>() {
            @Override
            public void onResponse(Call<MyImages> call, Response<MyImages> response) {
                Log.e("response","response"+response.code());
                if(response.isSuccessful()){
                    Log.e("response","response"+response.code());
                    if((response.body() != null ? response.body().getHits() : null) !=null){
                        List<Hits> imagesList = response.body().getHits();
                        articleArrayList.addAll(imagesList);
                      newsAdapter.notifyDataSetChanged();
                    }
                }



            }

            @Override
            public void onFailure(Call<MyImages> call, Throwable t) {
                System.out.println("Error: "+ t.getMessage());
                Log.e("response","response"+t);
            }
        });

    }
 private void setupRecyclerView() {
        if (newsAdapter == null) {
            newsAdapter = new ImagesAdapter(MainActivity.this, articleArrayList);

            rvHeadline.setLayoutManager(new LinearLayoutManager(this));
            rvHeadline.setAdapter(newsAdapter);
            rvHeadline.setItemAnimator(new DefaultItemAnimator());
            rvHeadline.setNestedScrollingEnabled(true);
        } else {
            newsAdapter.notifyDataSetChanged();
        }
    }

我不知道要在何处清除视图以获取新搜索的项目。

试验1：我试图清除列表对象articleArrayList，但适配器大小为null时会引发崩溃。

Answer 1

清洁

articleArrayList

在再次加载搜索到的项目之前。...通过执行此行"New Value"

articleArrayList.clear();

public void onResponse(Call<MyImages> call, Response<MyImages> response) {
                    Log.e("response","response"+response.code());
                    if(response.isSuccessful()){
                        Log.e("response","response"+response.code());
                        if((response.body() != null ? response.body().getHits() : null) !=null){
                            List<Hits> imagesList = response.body().getHits();

                            articleArrayList.clear();

Answer 2

您要将生成的imagesList添加到articleArrayList，您应该替换这些值。

articleArrayList = imagesList;

如何清除searchview中的recyclerview /适配器以便下次搜索android

2 个答案: