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();
}

}}

}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
>

<ListView
android:id="@+id/listView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>

</RelativeLayout>

<?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>