java - 修复操作栏中搜索 View 的 getfilter

Question

截至目前，我有三个选项卡(可滚动)，它们是带有 ActionBarActivity 实现 ActionBar.TabListener 的 fragment

我试图在按下搜索图标时添加搜索 View 功能，以便弹出一个编辑文本来过滤我想要搜索的应用程序。

我的目标是这样的:

目前我正在努力实现我从中学到的东西:

List Filter Custom Adapter dont give result

Android - Actionbar Sherlock - Search Filter

Android ActionBar Customize Search View

所以现在我的 ActionBarActivity 中有这个:

@Override
    public boolean onCreateOptionsMenu(Menu menu){
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.block, menu);

        final EditText editText = (EditText) menu.findItem(
                R.id.action_search).getActionView();
        editText.addTextChangedListener(textWatcher);

        MenuItem menuItem = menu.findItem(R.id.action_search);
        menuItem.setOnActionExpandListener(new OnActionExpandListener() {
            @Override
            public boolean onMenuItemActionCollapse(MenuItem item) {
                // Do something when collapsed
                return true; // Return true to collapse action view
            }

            @Override
            public boolean onMenuItemActionExpand(MenuItem item) {
                editText.clearFocus();
                return true; // Return true to expand action view
            }
        });

        return super.onCreateOptionsMenu(menu);
    }
    private TextWatcher textWatcher = new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before,
                                  int count) {

            if (null != mAdapter) {
                mAdapter.getFilter().filter(s);
            }
        }

问题是无法解析getFilter方法。在这种情况下我不确定。

我的适配器类是:

package com.ibc.android.demo.appslist.app;

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

import com.spicycurryman.getdisciplined10.app.R;

import java.util.List;

public class ApkAdapter extends BaseAdapter {


    List<PackageInfo> packageList;
    Activity context;
    PackageManager packageManager;
    boolean[] itemChecked;

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

    private class ViewHolder {
        TextView apkName;
        CheckBox ck1;
    }

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

    public Object getItem(int position) {
        return packageList.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 = inflater.inflate(R.layout.installed_apps, null);
            holder = new ViewHolder();

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

            convertView.setTag(holder);
             //holder.ck1.setTag(packageList.get(position));

        } else {

            holder = (ViewHolder) convertView.getTag();
        }
        // ViewHolder holder = (ViewHolder) convertView.getTag();
        PackageInfo packageInfo = (PackageInfo) getItem(position);

        Drawable appIcon = packageManager
                .getApplicationIcon(packageInfo.applicationInfo);
        String appName = packageManager.getApplicationLabel(
                packageInfo.applicationInfo).toString();
        appIcon.setBounds(0, 0, 75, 75);
        holder.apkName.setCompoundDrawables(appIcon, null, null, null);
        holder.apkName.setCompoundDrawablePadding(15);
        holder.apkName.setText(appName);
        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;
            }
        });

        return convertView;

    }



}

我需要在我的适配器类中更改什么来解决 getFilter 方法错误，为什么？我也想知道是否有更优化/更有效的方式来实现操作栏中的搜索...？

Answer 1

首先在ApkAdapter类中实现Filterable

在 apkAdapter 类中添加这个

    @Override
    public Filter getFilter() {
        if (mFilter == null) {
            mFilter = new ItemsFilter();
        }
        return mFilter;
    }

    private class ItemsFilter extends Filter {

        @Override
        protected FilterResults performFiltering(CharSequence prefix) {
            // TODO Auto-generated method stub

            ArrayList<PackageInfo> packageList_2 = packageList;
            String prefixString = prefix.toString().toLowerCase();
            FilterResults results = new FilterResults();
            ArrayList<PackageInfo> FilteredList = new ArrayList<PackageInfo>();

            if (prefix == null || prefix.length() == 0) {
                results.values = packageList_2;
                results.count = packageList_2.size();
                return results;
            }
            for (int i = 0; i < packageList_2.size(); i++) {
                String filterText = prefix.toString().toLowerCase();
                try {
                    PackageInfo data = packageList_2.get(i);
                    if (data.applicationInfo
                            .loadLabel(getActivity().getPackageManager())
                            .toString().toLowerCase().contains(filterText)) {
                        FilteredList.add(data);
                    } else if (data.packageName.contains(filterText)) {
                        FilteredList.add(data);
                    }
                } catch (Exception e) {
                    Toast.makeText(getActivity(),
                            "exception e" + e.toString(),
                            Toast.LENGTH_SHORT).show();
                }
            }
            results.values = FilteredList;
            results.count = FilteredList.size();
        }

        @SuppressWarnings("unchecked")
        @Override
        protected void publishResults(CharSequence constraint,
                FilterResults results) {
            Toast.makeText(getActivity(),"result-0 "+results.count,
                     Toast.LENGTH_SHORT).show(); 
            packageList = (List<PackageInfo>) results.values;
            notifyDataSetChanged();

        }
    }

然后在 OnCreateOptionMenu 中添加这个

    @Override
      public boolean onCreateOptionsMenu(Menu menu){
     MenuInflater inflater = getMenuInflater();
     inflater.inflate(R.menu.block, menu);

        SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
    SearchView searchView = (SearchView) menu.findItem(R.id.action_search).getActionView();
    searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {
            if (!isLoading()) {
                mAppAdapter.getFilter().filter(query);
            }
            return true;
        }

        @Override
        public boolean onQueryTextChange(String newText) {
            if (!isLoading()) {
                if (newText.equals("")) {
                    mAppAdapter.getFilter().filter("");
                }
            }
            return true;
        }
    });