java - 在扩展 BaseAdapter 的 customAdapter 中实现 getFilter

Question

前提:我是 Java 和 Android 的新手，我对此进行了很多搜索，但我不明白如何在我的代码中实现 getFilter。

这是MainActivity(相关代码):

public void loadList() {

  /* allProd and allSpec are ArrayList<String> */
  String[] allProdString = allProd.toArray(new String[allProd.size()]);
  String[] allSpecString = allSpec.toArray(new String[allSpec.size()]);

  listViewAdapter = new ListViewAdapter(this, allProdString, allSpecString);

  listView.setAdapter(listViewAdapter);

}

这是自定义适配器:

public class ListViewAdapter extends BaseAdapter {

Activity context;
String title[];
String description[];

public ListViewAdapter(Activity context, String[] title, String[] description) {

    super();
    this.context = context;
    this.title = title;
    this.description = description;
}

public int getCount() {
    return title.length;
}

public Object getItem(int position) {
    return position;
}

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

private class ViewHolder {

    TextView txtViewTitle;
    TextView txtViewDescription;

}

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

    Typeface typeface = Typeface.createFromAsset(context.getAssets(), "font/Simple_Print.ttf");

    ViewHolder holder;
    LayoutInflater inflater =  context.getLayoutInflater();

    if (convertView == null) {

        convertView = inflater.inflate(R.layout.tabella_prodotti, null);
        holder = new ViewHolder();
        holder.txtViewTitle = (TextView) convertView.findViewById(R.id.titoloProd);
        holder.txtViewDescription = (TextView) convertView.findViewById(R.id.subtitoloProd);

        holder.txtViewDescription.setTypeface(typeface);
        holder.txtViewTitle.setTypeface(typeface);

        convertView.setTag(holder);
    }
    else {
        holder = (ViewHolder) convertView.getTag();
    }

    holder.txtViewTitle.setText(title [position]);
    holder.txtViewDescription.setText(description [position]);

    return convertView;

 }

}

如何实现此函数以能够在数组中搜索，并在 ListView 中显示过滤结果？

如果您需要任何其他信息，请询问!谢谢

Answer 1

我认为你的适配器应该是这样的。另外我不建议在 getView() 中实例化对象，即字体对象

 public class ListViewAdapter extends BaseAdapter {
    String title[];
    String description[];
    ArrayList<String> filteredTitleList;
    ArrayList<String> filteredDescripionList;
    Typeface typeface;
    LayoutInflater inflater;

    public ListViewAdapter(Activity context, String[] title, String[] description) {
        super();
        this.context = context;
        this.title = title;
        this.description = description;

        typeface = Typeface.createFromAsset(context.getAssets(),"font/Simple_Print.ttf");

        inflater = context.getLayoutInflater();

        this.filteredTitleList = new ArrayList<String>();
        this.filteredDescripionList = new ArrayList<String>();
        applyFilter(null);
    }

    public void applyFilter(String filter){
        filteredTitleList.clear();
        filteredDescripionList.clear();

        for(int i=0; i < this.title.length; i++){
            String tempTitle = title[i];
            String tempDesc = description[i];

            if(filter == null || filter.equals("")){
                this.filteredTitleList.add(tempTitle);
                this.filteredDescripionList.add(tempDesc);
            }
            else if(tempTitle.toLowerCase().contains(filter.toLowerCase()) || tempDesc.toLowerCase().contains(filter.toLowerCase())){
                this.filteredTitleList.add(tempTitle);
                this.filteredDescripionList.add(tempDesc);
            }

        }
        this.notifyDataSetChanged();
    }

    public int getCount() {
        return filteredTitleList.size();
    }

    public Object getItem(int position) {
        return null;
    }

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

    private class ViewHolder {

        TextView txtViewTitle;
        TextView txtViewDescription;

    }

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

        ViewHolder holder;
        if (convertView == null) {

            convertView = inflater.inflate(R.layout.tabella_prodotti, null);
            holder = new ViewHolder();
            holder.txtViewTitle = (TextView) convertView.findViewById(R.id.titoloProd);
            holder.txtViewDescription = (TextView) convertView.findViewById(R.id.subtitoloProd);

            holder.txtViewDescription.setTypeface(typeface);
            holder.txtViewTitle.setTypeface(typeface);

            convertView.setTag(holder);
        }
        else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.txtViewTitle.setText(this.filteredTitleList.get(position));
        holder.txtViewDescription.setText(this.filteredDescriptionList.get(position));

        return convertView;

     }

    }