文章标题

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();
    }
}

}