Question

我有RecyclerView从对象数组中获取数据，我试图像这样在Recycler View适配器中生成过滤器，

    public void filter(String filterString) {
    filterString = filterString.toLowerCase(Locale.getDefault());
    results.clear();
    if(filterString.length() == 0) {
    }
    else {
        for( ToDo item : stringArrayList){
            if(item.getTODO_TITLE().toLowerCase(Locale.getDefault()).contains(filterString)) {
                results.add(item.getTODO_TITLE() );
            }
        }
    }
    notifyDataSetChanged();
}

}

当我在这样的菜单中调用它时

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu_search, menu);
    MenuItem searchItem = menu.findItem(R.id.action_search);
    SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchItem);
    searchView.setOnQueryTextFocusChangeListener(new View.OnFocusChangeListener() {

        @Override
        public void onFocusChange(View v, boolean hasFocus) {

        }
    });

    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {

        @Override
        public boolean onQueryTextSubmit(String query) {

            return true;
        }

        @Override
        public boolean onQueryTextChange(String searchQuery) {

            if (searchQuery.length() != 0) {
                if (null != recyclerAdapter) {
                    recyclerAdapter.filter(searchQuery.toString());
                    todoRecyclerView.invalidate();
                    todoAdapter.notifyDataSetChanged();
                }
            }
            else{
            }
            return false;
        }
    });


    MenuItemCompat.setOnActionExpandListener(searchItem, new MenuItemCompat.OnActionExpandListener() {
        @Override
        public boolean onMenuItemActionCollapse(MenuItem item) {
            return true;
        }
        @Override
        public boolean onMenuItemActionExpand(MenuItem item) {
            return true;
        }
    });
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    int id = item.getItemId();

    if (id == R.id.action_search) {

        return true;
    }
    return super.onOptionsItemSelected(item);
}}

它无法正常工作，并且没有显示任何错误！我怎么能解决这个问题????

这是我的代码进入回收商

public class TodoList extends AppCompatActivity implements DialogFragUpdateListener {
RecyclerView todoRecyclerView;
private RecyclerView.Adapter todoAdapter;
private RecyclerView.LayoutManager todoLayoutManager;
public List<ToDo> results;
public List<String> list = new ArrayList<>();
TodoRecyclerAdapter recyclerAdapter;
Context context;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_todo_list);

    todoRecyclerView = (RecyclerView)findViewById(R.id.todoRecyclerView);
    todoRecyclerView.setHasFixedSize(true);
    results= new ArrayList<ToDo>();
    todoLayoutManager = new LinearLayoutManager(this);
    todoRecyclerView.setLayoutManager(todoLayoutManager);
      getRetrofitObject();
    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(TodoList.this,AddToDo.class);
            startActivity(intent);
        }
    });}

public void getRetrofitObject() {
    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl(BASE_URL)
            .addConverterFactory(GsonConverterFactory.create())
            .build();
    APIService service = retrofit.create(APIService.class);
    Call<Result> call = service.getresults();
    call.enqueue(new Callback<Result>() {
        @Override
        public void onResponse(Call<Result> call, Response<Result> response) {
            results = response.body().getResults();
            todoRecyclerView.setAdapter(new TodoRecyclerAdapter(this,results));
        }
        @Override
        public void onFailure(Call<Result> call, Throwable t) {
            Log.d("onFailure", t.toString());
        }});}

Recycler查看 Adpater

public class TodoRecyclerAdapter extends RecyclerView.Adapter<TodoRecyclerAdapter.ViewHolder>  {

static List<ToDo> todoResults;
static Context context;
List<String> results;
private List<String> mDefaultCheeses;
private List<ToDo> mData;
private List<ToDo> originalData;
private ArrayList<ToDo> arrayList = null, stringArrayList;


public TodoRecyclerAdapter(Callback<Result> callback, List<ToDo> results) {
    this.todoResults = results;
     arrayList= (ArrayList<ToDo>) results;

}

@Override
public TodoRecyclerAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View itemLayoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.todo_items, null);
    ViewHolder viewHolder = new ViewHolder(itemLayoutView);
    return viewHolder;
}

@Override
public void onBindViewHolder(final TodoRecyclerAdapter.ViewHolder holder, final int position) {
    holder.todoTitle.setText(todoResults.get(position).getTODO_TITLE().toString());
    String priority = todoResults.get(position).getPriority().toString();
    if (priority.equals("Low")) {
        holder.todoImage.setImageResource(R.drawable.low);
    } else if (priority.equals("Normal")) {
        holder.todoImage.setImageResource(R.drawable.normal);
    } else if (priority.equals("High")) {
        holder.todoImage.setImageResource(R.drawable.high);
    }
}

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

public static class ViewHolder extends RecyclerView.ViewHolder {
    public TextView todoTitle;
    public ImageView todoImage;

    public ViewHolder(View itemLayoutView) {
        super(itemLayoutView);
        todoTitle = (TextView) itemLayoutView.findViewById(R.id.todo_title);
        todoImage = (ImageView) itemLayoutView.findViewById(R.id.imageView2);
    }
}

public void filter(String filterString) {
    filterString = filterString.toLowerCase(Locale.getDefault());
    results.clear();
    if(filterString.length() == 0) {
    }
    else {
        for( ToDo item : stringArrayList){
            if(item.getTODO_TITLE().toLowerCase(Locale.getDefault()).contains(filterString)) {
                results.add(item.getTODO_TITLE() );
            }
        }
    }
    notifyDataSetChanged();
}

}

Answer 1

我认为错误不在日志中，因为您没有向结果添加元素。您必须记录您的代码，看看那里发生了什么。也许这会对你有所帮助：在filter方法中试试这个：

ArrayList<Note> result;
List<ToDO>itemsCopy = new ArrayList<>();

private void filter(String text){

        itemsCopy= items in results arraylist

        result = new ArrayList<>();
        text = text.toLowerCase();
        for(ToDO item: itemsCopy){
            if(item.getTitle().toLowerCase().contains(text)){
                result.add(item);
            }
        }
        results.clear();
        results.addAll(result);
        notifyDataSetChanged();
        //Log your code! Always helps
        Log.i(TAG, "---RESULT--" +result.toString());

}

然后在OnCreateOptionsMenu：

@Override
            public boolean onQueryTextSubmit(String query) {
                filter(query);

                return true;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
                filter(newText);

                return true;
            }
        });

希望它有所帮助！

从Android对象数组中筛选Recyclerview

1 个答案: