Android 利用SearchView实现ListView过滤

package org.load.searchView;

 

import java.util.ArrayList;

import java.util.List;

 

import android.app.Activity;

import android.os.Bundle;

import android.support.v4.view.MenuItemCompat;

import android.text.TextUtils;

import android.view.Menu;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.BaseAdapter;

import android.widget.Filter;

import android.widget.Filterable;

import android.widget.ListView;

import android.widget.SearchView;

import android.widget.Toast;

import android.widget.SearchView.OnQueryTextListener;

import android.widget.TextView;

 

public class MainActivity extends Activity {

 

    private List<String> mData = new ArrayList<String>();  // 这个数据会改变

    private List<String> mBackData;  // 这是原始的数据

 

    private ListView mListView;

    private SearchView mSearchView;

 

    private MyAdapter mAdapter;

 

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

 

        mListView = (ListView) super.findViewById(R.id.list);

        mListView.setTextFilterEnabled(true);

        mListView.setOnItemClickListener(new ItemClick());

 

        initData();

 

        mAdapter = new MyAdapter();

        mListView.setAdapter(mAdapter);

    }

 

    // 必须实现Filterable接口

    private class MyAdapter extends BaseAdapter implements Filterable {

        private MyFilter mFilter;

 

        @Override

        public int getCount() {

            return mData.size();

        }

 

        @Override

        public Object getItem(int position) {

            return mData.get(position);

        }

 

        @Override

        public long getItemId(int position) {

            return position;

        }

 

        @Override

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

            if (null == convertView) {

                convertView = View.inflate(MainActivity.this, R.layout.item,

                        null);

            }

 

            TextView show = (TextView) convertView.findViewById(R.id.show);

 

            show.setText(mData.get(position));

 

            return convertView;

        }

 

        @Override

        public Filter getFilter() {

            if (null == mFilter) {

                mFilter = new MyFilter();

            }

            return mFilter;

        }

         

        // 自定义Filter类

        class MyFilter extends Filter {

            @Override

            // 该方法在子线程中执行

            // 自定义过滤规则

            protected FilterResults performFiltering(CharSequence constraint) {

                FilterResults results = new FilterResults();

 

                List<String> newValues = new ArrayList<String>();

                String filterString = constraint.toString().trim()

                        .toLowerCase();

 

                // 如果搜索框内容为空，就恢复原始数据

                if (TextUtils.isEmpty(filterString)) {

                    newValues = mBackData;

                } else {

                    // 过滤出新数据

                    for (String str : mBackData) {

                        if (-1 != str.toLowerCase().indexOf(filterString)) {

                            newValues.add(str);

                        }

                    }

                }

 

                results.values = newValues;

                results.count = newValues.size();

 

                return results;

            }

 

            @Override

            protected void publishResults(CharSequence constraint,

                    FilterResults results) {

                mData = (List<String>) results.values;

 

                if (results.count > 0) {

                    mAdapter.notifyDataSetChanged();  // 通知数据发生了改变

                } else {

                    mAdapter.notifyDataSetInvalidated(); // 通知数据失效

                }

            }

        }

    }

     

    // 搜索文本监听器

    private class QueryListener implements OnQueryTextListener {

        // 当内容被提交时执行

        @Override

        public boolean onQueryTextSubmit(String query) {

            return true;

        }

 

        // 当搜索框内内容发生改变时执行

        @Override

        public boolean onQueryTextChange(String newText) {

            if (TextUtils.isEmpty(newText)) {

                mListView.clearTextFilter();  // 清楚ListView的过滤

            } else {

                mListView.setFilterText(newText); // 设置ListView的过滤关键词

            }

            return true;

        }

    }

 

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.main, menu);

         

        // 获取Menu中searchView组件

        mSearchView = (SearchView) MenuItemCompat.getActionView(menu

                .findItem(R.id.search));

         

        // 设置监听器

        mSearchView.setOnQueryTextListener(new QueryListener());

        return true;

    }

 

    private void initData() {

        for (int i = 0; i < 50; i++) {

            mData.add("hello android " + i);

        }

        mBackData = mData;

    }

 

    private class ItemClick implements OnItemClickListener {

        @Override

        public void onItemClick(AdapterView<?> parent, View view, int position,

                long id) {

            Toast.makeText(MainActivity.this, mData.get(position),

                    Toast.LENGTH_SHORT).show();

        }

    }

}