為什么在頂部欄中的搜索在androidstudio中不起作用？

我制作了一個應用程式，listView我想在頂部欄中使用搜索，但它不起作用

這些是下面的代碼：

這是onCreateOptionsMenu代碼MainActivity.

public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        getMenuInflater().inflate(R.menu.menu_main_screen, menu);

        MenuItem searchItem = menu.findItem(R.id.search_item);
        SearchView searchView = (SearchView) searchItem.getActionView();

        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {
                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
                newText = newText.toLowerCase();
                ArrayList<Informatin> newList = new ArrayList<>();
                for (Informatin informatin : listItem) {
                    String firstName = informatin.getFirstName().toLowerCase();
                    if (firstName.contains(newText)) {
                        newList.add(informatin);
                    }
                }
                adapter.filter(newList);
                adapter.notifyDataSetChanged();
                return true;
            }
        });
        return true;
    }

這是代碼filter的listAdapter代碼

public void filter(ArrayList<Information> newList){
        arrayList = new ArrayList<>();
        arrayList.addAll(newList);
    }

這是listAdapter代碼

public class listAdapter extends ArrayAdapter<Informatin> implements Filterable {

    ArrayList<Informatin> arrayList;

    public listAdapter(Context context, List<Informatin> informatins) {
        super(context, 0, informatins);
    }

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

        View listItemView = convertView;
        if (listItemView == null) {
            listItemView = LayoutInflater.from(getContext()).inflate(
                    R.layout.list_item, parent, false);
        }

        Informatin currentList = getItem(position);

        TextView nameTextView = listItemView.findViewById(R.id.name);
        TextView descriptionTextView = listItemView.findViewById(R.id.description);
        TextView ageTextView = listItemView.findViewById(R.id.age);
        ImageView imageView = listItemView.findViewById(R.id.image);

        String firstName = currentList.getFirstName();
        String lastName = currentList.getLastName();

        String name = firstName   " "   lastName;

        nameTextView.setText(name);
        descriptionTextView.setText(currentList.getDescription());

        ageTextView.setText(currentList.getAge());

        return listItemView;
    }

    public void filter(ArrayList<Informatin> newList){
        arrayList = new ArrayList<>();
        arrayList.addAll(newList);
    }

}

uj5u.com熱心網友回復：

在我看來，您Filterable在這里所做的實作根本不需要介面。要解決代碼中的問題，您可以執行以下操作

public class listAdapter extends ArrayAdapter<Informatin> {


public listAdapter(Context context, List<Informatin> informatins) {
    super(context, 0, informatins);
}

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

    View listItemView = convertView;
    if (listItemView == null) {
        listItemView = LayoutInflater.from(getContext()).inflate(
                R.layout.list_item, parent, false);
    }

    Informatin currentList = getItem(position);

    TextView nameTextView = listItemView.findViewById(R.id.name);
    TextView descriptionTextView = listItemView.findViewById(R.id.description);
    TextView ageTextView = listItemView.findViewById(R.id.age);
    ImageView imageView = listItemView.findViewById(R.id.image);

    String firstName = currentList.getFirstName();
    String lastName = currentList.getLastName();

    String name = firstName   " "   lastName;

    nameTextView.setText(name);
    descriptionTextView.setText(currentList.getDescription());

    ageTextView.setText(currentList.getAge());

    return listItemView;
}

搜索代碼

searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {
            return false;
        }

        @Override
        public boolean onQueryTextChange(String newText) {
            newText = newText.toLowerCase();
            ArrayList<Informatin> newList = new ArrayList<>();
            for (Informatin informatin : listItem) {
                String firstName = informatin.getFirstName().toLowerCase();
                if (firstName.contains(newText)) {
                    newList.add(informatin);
                }
            }
            adapter.clear();
            adapter.addAll(newList);
            adapter.notifyDataSetChanged();
            return true;
        }
    });
    return true;
}

uj5u.com熱心網友回復：

將此添加到您的 listadapter 代碼中：

    Context context;
     public listAdapter(Context context, List<Informatin> informatins) {
    super();
    this.context=context;
    arraylist=informatins;

}
    ArrayList<Informatin> informatins;
    public Filter getFilter() {
    return new Filter() {

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            final FilterResults oReturn = new FilterResults();
            final ArrayList<Informatin> results = new ArrayList<Informatin>();
            if (informatins == null)
                informatins = arraylist;
            if (constraint != null) {
                if (informatins != null && informatins.size() > 0) {
                    for (final Information g : informatins) {
                        if (g.getName().toLowerCase()
                                .contains(constraint.toString()))
                            results.add(g);
                    }
                }
                oReturn.values = results;
            }
            return oReturn;
        }

        @SuppressWarnings("unchecked")
        @Override
        protected void publishResults(CharSequence constraint,
                                      FilterResults results) {
            arraylist = (ArrayList<Informatin>) results.values;
            notifyDataSetChanged();
        }
    };
}

將此添加到您的 onquerytextchaged 中：

       yourlistView.getFilter().filter(newText)

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