无法过滤列表视图项

Question

我正在尝试列出所有已安装的应用程序并在列表视图中动态过滤结果。下面是我在 listadapter.java:

中的代码

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import android.app.Activity;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.graphics.drawable.Drawable;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;

public class Listadapter extends BaseAdapter implements Filterable {


   List<PackageInfo> packageList;
    List<PackageInfo> filteredData = null;
    List<PackageInfo> originalData = null;
    Activity context;
    PackageManager packageManager;
    boolean[] itemChecked;
    private boolean notifyChanged = true;
    ItemFilter mFilter = new ItemFilter();
LayoutInflater mInflater;

    public Listadapter(Activity context,  List<PackageInfo> packageList,
                       PackageManager packageManager) {
        super();
        this.context = context;
        this.packageList = packageList;
        itemChecked = new boolean[packageList.size()];
        this.packageManager = packageManager;


        this.filteredData = packageList;
        this.originalData = packageList;
        mInflater = LayoutInflater.from(context);

    }




    private class ViewHolder {
        TextView apkName;
        CheckBox ck1;
    }

    public int getCount() {
        if(filteredData==null){
            Log.v("LOG", "Warn, null filteredData");
            return 0;
        }else{
            return filteredData.size();
        }
    }

    public Object getItem(int position) {
        return filteredData.get(position);
    }



    public long getItemId(int position) {
        return 0;
    }

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

        LayoutInflater inflater = context.getLayoutInflater();

        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.list_item, null);
            holder = new ViewHolder();

            holder.apkName = (TextView) convertView
                    .findViewById(R.id.textView1);
           // holder.ck1 = (CheckBox) convertView
             //       .findViewById(R.id.checkBox1);

            convertView.setTag(holder);

        } else {

            holder = (ViewHolder) convertView.getTag();
        }

        PackageInfo packageInfo = (PackageInfo) getItem(position);

        SimpleDateFormat sdf = new SimpleDateFormat("[yyyy-MM-dd]");


        Drawable appIcon = packageManager
                .getApplicationIcon(packageInfo.applicationInfo);
        //String packageName = packageInfo.packageName;

        String appName = packageManager.getApplicationLabel(
                packageInfo.applicationInfo).toString() + "\n" + sdf.format(new Date(packageInfo.firstInstallTime));
       // String appName = packageManager.getApplicationLabel(
         //              packageInfo.applicationInfo).toString()+ "\n" + packageInfo.packageName ;

                appIcon.setBounds(0, 0, 150, 150);
        holder.apkName.setCompoundDrawables(appIcon, null, null, null);
        holder.apkName.setCompoundDrawablePadding(15);
        holder.apkName.setText(appName);
       // holder.apkName.setText(packageName);
      //  holder.ck1.setChecked(false);

      //  if (itemChecked[position])
       //     holder.ck1.setChecked(true);
       // else
         //   holder.ck1.setChecked(false);
/*
        holder.ck1.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                if (holder.ck1.isChecked())
                    itemChecked[position] = true;
                else
                    itemChecked[position] = false;
            }
        });

        if (itemChecked != null) {

        }
*/
        return convertView;

    }

    //////search filter

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

    private class ItemFilter extends Filter {
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {

            String filterString = constraint.toString().toLowerCase();

            FilterResults results = new FilterResults();

            final List<PackageInfo> list = originalData;

            int count = packageList.size();
            final ArrayList<PackageInfo> nlist = new ArrayList<>(count);

            PackageInfo filterableString;

            for (int i = 0; i < count; i++) {
                filterableString = list.get(i);
                if (filterString.toLowerCase().contains(filterString)) {
                    nlist.add(filterableString);
                }
            }

            results.values = nlist;
            results.count = nlist.size();

            return results;
        }

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

    }


    ///filter finished


}

在 MainActivity.java 中，我有以下代码来作用于 OnCreate 中的 Searchview：

final Listadapter Adapter = new Listadapter(this, (ArrayList<PackageInfo>) packageList1, packageManager);

        apps.setAdapter(Adapter);


        //enables filtering for the contents of the given ListView
        apps.setTextFilterEnabled(true);

       final SearchView sv = (SearchView) findViewById(R.id.inputSearch);



        sv.setOnQueryTextListener(new SearchView.OnQueryTextListener() {


            @Override
            public boolean onQueryTextSubmit(String text) {
                return false;
            }

            @Override
            public boolean onQueryTextChange(String text) {

                Adapter.getFilter().filter(text);
                return false;
            }
        });

在 SearchView 中输入文本时，它什么也不做。它不会过滤列表视图项目或给出任何错误。

Answer 1

为什么要使用三个数组列表。两个就够了。删除 packageList

您正在为 OnQueryTextSubmit 返回 true。

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

                @Override
                public boolean onQueryTextChange(String newText) {


                    if (adapter != null && newText != null) {
                        adapter.getFilter().filter(newText);

                        return true;
                    }

                    return false;
                }


            });

并且您没有将 appname 与 searchtext 进行比较，也没有将结果提供给 listview。

@Override
        protected FilterResults performFiltering(CharSequence constraint) {

            String constraintStr = constraint.toString().toLowerCase(Locale.getDefault());
            FilterResults result = new FilterResults();

            if (constraintStr != null & constraintStr.length() > 0) {
                ArrayList<PackageInfo> filterItems = new ArrayList< PackageInfo>();

                synchronized (this) {
                    for (PackageInfo item : originalData) {
                        if (packageManager.getApplicationLabel(
             item.applicationInfo).toLowerCase(Locale.getDefault()).contains(constraintStr)) {
                            filterItems.add(item);
                        }
                    }
                    result.count = filterItems.size();
                    result.values = filterItems;
                }
            } else {
                synchronized (this) {
                    result.count = originalData.size();
                    result.values = originalData;
                }
            }
            return result;


        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            filteredData = (ArrayList<PackageInfo>) results.values;

            // Debug.e("filteredData", "" + filteredData.toString());
            notifyDataSetChanged();
        }

    }

无法过滤列表视图项

Unable to filter listview items

android

baseadapter

searchview

android-filterable