Android利用Filter过滤数据

package cc.testfilterable;

import java.util.ArrayList;
import java.util.HashMap;
import android.os.Bundle;
import android.widget.ListView;
import android.app.Activity;
import android.content.Context;
/**
 * Demo描述:
 * 利用Filter过滤数据
 * 可用于AutoCompleteTextView筛选数据等功能
 * 
 * 备注说明:
 * 该Demo只表述原理,代码逻辑较简单,有一些小的bug.
 * 完整的应用请参见以下资料.
 * 
 * 参考资料:
 * 1 http://gundumw100.iteye.com/blog/1446507
 * 2 http://blog.csdn.net/ssstudio/article/details/7579089
 * 3 http://blog.csdn.net/jiahui524/article/details/7802033
 * 
 */
public class MainActivity extends Activity {
  private Context mContext;
    private ListView mListView;
    private ListViewAdapter mListViewAdapter;
    private ArrayList<String> mArrayList;
    private HashMap<String, String> mHashMap;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    init();
  }

  private void init(){
    mContext=this;
    mListView=(ListView) findViewById(R.id.listView);
    mArrayList=new ArrayList<String>();
    mArrayList.add("张三1");
    mArrayList.add("李四1");
    mArrayList.add("王五1");
    mArrayList.add("张三2");
    mArrayList.add("李四2");
    mArrayList.add("王五2");
    mArrayList.add("张三3");
    mArrayList.add("李四3");
    mArrayList.add("王五3");
    mArrayList.add("张三4");
    mArrayList.add("李四4");
    mArrayList.add("王五4");
    mListViewAdapter=new ListViewAdapter(mContext, mArrayList);
    //过滤数据
    //过滤出姓名里面包含"张"的数据
    mListViewAdapter.getFilter().filter("张");
    mListView.setAdapter(mListViewAdapter);
  }

}

package cc.testfilterable;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.TextView;

public class ListViewAdapter extends BaseAdapter {
  private NameFilter mNameFilter;
  private List<String> mArrayList;
  private List<String> mFilteredArrayList;
  private LayoutInflater mLayoutInflater;
  public ListViewAdapter(Context context,List<String> arrayList) {
    mArrayList = arrayList;
    mLayoutInflater=LayoutInflater.from(context);
    mFilteredArrayList=new ArrayList<String>();
  }

  @Override
  public int getCount() {
    if (mArrayList == null) {
      return 0;
    } else {
      return (mArrayList.size());
    }

  }

  @Override
  public Object getItem(int position) {
    if (mArrayList == null) {
      return null;
    } else {
      return mArrayList.get(position);
    }
  }

  @Override
  public long getItemId(int position) {
    return position;
  }
  
  public Filter getFilter() {  
       if (mNameFilter == null) {    
    	   mNameFilter = new NameFilter();    
       }    
      return mNameFilter;  
    }  


  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    View itemView = null;
    itemView = convertView;
    ViewHolder viewHolder = null;
    if (itemView == null) {
      itemView = mLayoutInflater.inflate(R.layout.listviewitem, null);
      viewHolder = new ViewHolder();
      viewHolder.textView = (TextView) itemView.findViewById(R.id.textView);
      itemView.setTag(viewHolder);
    } else {
      viewHolder = (ViewHolder) itemView.getTag();
    }

    if (mArrayList != null) {
      if (viewHolder.textView != null) {
        viewHolder.textView.setText((mArrayList.get(position)));
      }

    }

    convertView = itemView;
    return convertView;
  }
  

  private class ViewHolder {
    TextView textView;
  }
  
  
  //过滤数据
  class NameFilter extends Filter {
    //执行筛选
    @Override
    protected FilterResults performFiltering(CharSequence charSequence) {
      FilterResults filterResults = new FilterResults();
      for (Iterator<String> iterator = mArrayList.iterator(); iterator.hasNext();) {
        String name = iterator.next();
        System.out.println("---> name=" + name);
        if (name.contains(charSequence)) {
          mFilteredArrayList.add(name);
        }
      }
      filterResults.values = mFilteredArrayList;
      return filterResults;
    }

    //筛选结果
    @Override
    protected void publishResults(CharSequence arg0, FilterResults results) {
      mArrayList = (List<String>) results.values;
      if (results.count > 0) {
        notifyDataSetChanged();
      } else {
        notifyDataSetInvalidated();
      }

    }}
  
}