Android onQueryTextChange 不显示 UI 更改

Question

当我开始输入我的android.widget.SearchView 时，我能够找到输入文本的匹配项，并看到我的Filter 来自我的Adapter，它扩展了BaseAdapter，确实找到了结果，但是，我在输入时实际上并没有看到建议的列表。

这是我所拥有的：

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    super.onCreateOptionsMenu(menu);

    MenuItem searchItem = menu.add(Menu.NONE, R.id.search_card, 1, R.string.search_card);
    searchItem.setIcon(R.drawable.search);
    searchItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);

    LinearLayout searchLayout = (LinearLayout) LayoutInflater.from(this).inflate(R.layout.search_view, null);
    SearchView searchView = searchLayout.findViewById(R.id.searchVieww);
    searchItem.setActionView(searchView);
    
    //this will be a dynamic list in the end, but just wanna get it to work first...
    List<ListViewItem> suggestionList = new ArrayList<>();
    suggestionList.add(new ListViewItem("abc", "123"));
    suggestionList.add(new ListViewItem("apple", "345"));
    ListViewAdapter adapter = new ListViewAdapter(suggestionList);
    ListView listView = searchLayout.findViewById(R.id.searchViewList);
    listView.setAdapter(adapter);

    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String word) {
            searchCardsForWord(word.trim());
            searchView.setIconified(true); //first call to clear search bar
            searchView.setIconified(true); //second call to close search bar
            return true;
        }

        @Override
        public boolean onQueryTextChange(String word) {
            adapter.getFilter().filter(word);
            Log.d("DEBUG", "query text filter: " + adapter.getCount());// the count of this is NOT zero when I type in 'a'
            return false;
        }
    });

    ...adding other MenuItems

    return true;
}

适配器

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.Filterable;

import com.boredofnothing.flashcard.databinding.ListViewItemBinding;

import java.util.ArrayList;
import java.util.List;

public class ListViewAdapter extends BaseAdapter implements Filterable {
    private List<ListViewItem> itemList;
    private List<ListViewItem> itemListFull;
    private LayoutInflater inflater;

    ListViewAdapter(List<ListViewItem> itemList) {
        this.itemList = itemList;
        itemListFull = new ArrayList<>(itemList);
    }

    @Override
    public int getCount() {
        return itemList.size();
    }

    @Override
    public ListViewItem getItem(int position) {
        return itemList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public Filter getFilter() {
        return filter;
    }

    private Filter filter = new Filter() {
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            List<ListViewItem> filteredList = new ArrayList<>();

            if (constraint == null || constraint.length() == 0) {
                filteredList.addAll(itemListFull);
            } else {
                String filterPattern = constraint.toString().toLowerCase().trim();

                for (ListViewItem item : itemListFull) {
                    if (item.getText1().toLowerCase().contains(filterPattern)
                        || item.getText2().toLowerCase().contains(filterPattern)) {
                        filteredList.add(item);
                    }
                }
            }

            FilterResults results = new FilterResults();
            results.values = filteredList;

            return results;
        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            itemList.clear();
            itemList.addAll((List) results.values);
            notifyDataSetChanged();
        }
    };

    @Override
    public View getView(int position, View convertView, final ViewGroup parent) {

        if (inflater == null) {
            inflater = (LayoutInflater) parent.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }

        ListViewItemBinding listViewItemBinding = ListViewItemBinding.inflate(inflater);
        listViewItemBinding.textView1.setText(itemList.get(position).getText1());
        listViewItemBinding.textView2.setText(itemList.get(position).getText2());

        return listViewItemBinding.getRoot();
    }
}

search_view.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:focusableInTouchMode="true"
    android:orientation="vertical">

    <SearchView
        android:id="@+id/searchVieww"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:queryHint="Input word to search"></SearchView>

    <ListView
        android:id="@+id/searchViewList"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:layout_marginBottom="16dp"
        android:padding="8dp"
        android:scrollbars="none" />

</LinearLayout>

list_view_item.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="4dp"
    app:cardCornerRadius="4dp">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="4dp">

        <TextView
            android:id="@+id/text_view1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:textColor="@android:color/black"
            android:textSize="20sp"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/text_view2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/text_view1"
            android:layout_marginStart="8dp"
            android:textSize="15sp" />
    </RelativeLayout>

</android.support.v7.widget.CardView>

在选择 SearchView 之前：

选择 SerachView 后：

输入“a”后：

最后，如果输入的单词/字符匹配或包含在我的suggestionList 中，我希望看到Cardviews 中的ListView。

Answer 1

我只是在我的活动布局中添加 ListView

private SearchView searchView;
private ListView listView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.search_view);
    searchView = findViewById(R.id.searchVieww);
    listView = findViewById(R.id.searchViewList);
}

Answer 2

问题在于您发布结果的方式。

把itemList.clear();改成

itemList = (List) results.values
        

发生的事情是，一旦您清除，所有对象都具有相同的引用，因此所有数据都丢失了，您看不到任何结果。