Filter(三)——Android利用Filterable接口过滤数据

MainActivity如下:

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);
	}

}

ListViewAdapter如下:

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.Filterable;
import android.widget.TextView;

public class ListViewAdapter extends BaseAdapter implements Filterable{
	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;
	}
	
	//该方法来自接口Filterable
	@Override
	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();
			}

		}}

	
}

listviewitem.xml如下:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
     >
    <TextView 
       android:id="@+id/textView"
       android:layout_width="wrap_content"
       android:layout_height="50dip"
       android:gravity="center"
    />    
   
</LinearLayout>