过滤器的ListView与arrayadapter [英] Filter ListView with arrayadapter
本文介绍了过滤器的ListView与arrayadapter的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我试图筛选与arrayadapter列表视图。该arraydapter参数是一个String [] []。问题是，有什么事情发生。我必须重写Filter接口？在这种情况下plase，有人可以提供一些线索？
数组我想过滤的每一个位置，就像
galleryValues [0] [0] - ＆GT; tiulo
[0] [1] - ＆GT; 说明
[0] [2] - ＆GT; 等
我tryied对其进行过滤：
lstContinente =（ListView控件）findViewById（R.id.list）;
lstContinente.setTextFilterEnabled（真正的）;
适配器=新PortaitArrayAdapter（CX，galleryValues）;
lstContinente.setAdapter（适配器）;
ed_busqueda.addTextChangedListener（新TextWatcher（）{
公共无效afterTextChanged（编辑S）{}
公共无效beforeTextChanged（CharSequence中，诠释开始，诠释计数，之后INT）{
// TODO自动生成方法存根
}
公共无效onTextChanged（CharSequence中，诠释开始，诠释之前，诠释计数）{
。adapter.getFilter（）滤波器（s.toString（））;
adapter.notifyDataSetChanged（）;
}
}）;
适配器code：
公共类PortaitArrayAdapter扩展ArrayAdapter＆LT;字符串＆GT; {
私人最终上下文的背景下;
私人最终的String [] []值;
私人列表＆LT; IMAGEN＆GT; imagenes = NULL;
私人LayoutInflater mInflater;
公共ImageLoader的ImageLoader的;
公共PortaitArrayAdapter（上下文的背景下，的String [] []值）{
超（背景下，R.layout.gallery_row）;
this.context =背景;
this.values =值;
mInflater =（LayoutInflater）上下文
.getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
imagenes =新的ArrayList＆LT; IMAGEN＆GT;（）;
的for（int i = 0;我小于20;我++）imagenes.add（新IMAGEN（））;
位图DEF = BitmapFactory.de codeResource（this.context.getResources（），R.drawable.ic_launcher）;
ImageLoader的=新ImageLoader的（this.context，闪避，imagenes）;
}
@覆盖
公众诠释getCount将（）{
返回this.values.length;
}
@覆盖
公共查看getView（INT位置，查看convertView，ViewGroup中父）{
ViewHolder持有人;
如果（convertView == NULL）{
持有人=新ViewHolder（）;
convertView = mInflater.inflate（R.layout.gallery_row，父母，假）;
holder.txtTitulo =（TextView中）convertView.findViewById（R.id.txt_gallery_titulo）;
holder.txtDesc =（TextView中）convertView.findViewById（R.id.txt_gallery_desc）;
holder.txtFecha =（TextView中）convertView.findViewById（R.id.txt_gallery_fecha）;
holder.txtEst =（TextView中）convertView.findViewById（R.id.txt_gallery_est）;
holder.imageView =（ImageView的）convertView.findViewById（R.id.lst_img_gallery）;
convertView.setTag（保持器）;
} 其他 {
支架=（ViewHolder）convertView.getTag（）;
}
/ * LayoutInflater吹气=（LayoutInflater）上下文
.getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
查看rowView = inflater.inflate（R.layout.gallery_row，父母，假）; * /
// ImageView的ImageView的=（ImageView的）rowView.findViewById（R.id.icon）;
BMP位图;
Log.v（位置 - ＆gt;中，将String.valueOf（位置））;
尝试 {
BYTE B [] = imagenes.get（位置）.getImageData（）;
如果（B！= NULL）{
BMP = BitmapFactory.de codeByteArray（B，0，b.length个）;
如果（BMP！= NULL）holder.imageView.setImageBitmap（BMP）;
} 其他 {
字符串urlBase = galleryValues [位置] [0] .substring（0，galleryValues [位置] [0] .lastIndexOf（/）+ 1）;
字符串urlToEn code = galleryValues [位置] [0] .substring（galleryValues [位置] [0] .lastIndexOf（/）+ 1，galleryValues [位置] [0] .length（））;
urlToEn code = URLEn coder.en code（urlToEn code，UTF-8）;
字符串URL = urlBase.concat（urlToEn code）;
网址= url.replace（+，20％）;
Log.v（UrlFinal - ＆gt;中，URL）;
imageLoader.DisplayImage（将String.valueOf（位置），网址，行为，holder.imageView，位置，NULL）;
}
}赶上（例外五）{
Log.e（this.getClass（）的getName（），异常EN POS =+位置+错误：+ e.getMessage（））;
e.printStackTrace（）;
}
holder.txtTitulo.setText（galleryValues [位置] [1] +，+ galleryValues [位置] [2]）;
的String []日期= galleryValues [位置] [4] .split（/）;
串日期=日期[1] +/+红枣[0] +/+红枣[2];
日D1 =新的日期（日期）;
日期格式DF = DateFormat.getDateInstance（DateFormat.LONG）;
holder.txtDesc.setText（galleryValues [位置] [3]）;
holder.txtFecha.setText（df.format（D1））;
holder.txtEst.setText（的getText（R.string.num_fotos_gallery）+ galleryValues [位置] [5] + - +的getText（R.string.num_videos_gallery）+ galleryValues [位置] [6] + - +的getText（ R.string.num_exp_gallery）+ galleryValues [位置] [7]）;
返回convertView;
}
}
私有静态类ViewHolder {
TextView的txtTitulo;
TextView的txtDesc;
TextView的txtFecha;
TextView的txtEst;
ImageView的ImageView的;
}
解决方案
隐蔽的字符串数组，ArrayList和它传递给适配器，使用下面code或更改低于code你的String []
您需要实现的可筛选你的适配器类并重写用getFilter（）
结帐<一href="http://www.devdaily.com/java/jwarehouse/android/core/java/android/app/LauncherActivity.java.shtml">this完整的例子进行过滤定制适配器。
公共类ListFilterActivity扩展ListActivity {
私人列表＆LT;字符串＆GT;名单=新的ArrayList＆LT;字符串＆GT;（）;
名单＆LT;字符串＆GT; mOriginalValues;
@覆盖
公共无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.main）;
最后MyAdapter适配器=新MyAdapter（这一点，getModel（））;
setListAdapter（适配器）;
EditText上filterEditText =（EditText上）findViewById（R.id.filterText）;
//添加文本变化监听到的EditText
filterEditText.addTextChangedListener（新TextWatcher（）{
@覆盖
公共无效onTextChanged（CharSequence中，诠释开始，诠释之前，诠释计数）{
//调用回来当前字符的适配器过滤器
。adapter.getFilter（）滤波器（s.toString（））;
}
@覆盖
公共无效beforeTextChanged（CharSequence中，诠释开始，诠释计数，之后INT）{
}
@覆盖
公共无效afterTextChanged（编辑S）{
}
}）;
}
私人列表＆LT;字符串＆GT; getModel（）{
list.add（Linux的）;
list.add（Windows7的）;
list.add（粟色）;
list.add（月食）;
list.add（Ubuntu的）;
list.add（中的Solaris）;
list.add（机器人）;
list.add（iPhone）;
list.add（视窗XP）;
返回列表;
}
//适配器类
公共类MyAdapter扩展了BaseAdapter实现过滤的{
名单＆LT;字符串＆GT; ArrayList的;
名单＆LT;字符串＆GT; mOriginalValues; //原始值
LayoutInflater充气;
公共MyAdapter（上下文的背景下，列表与LT;字符串＆GT;的ArrayList）{
this.arrayList = ArrayList的;
充气= LayoutInflater.from（上下文）;
}
@覆盖
公众诠释getCount将（）{
返回arrayList.size（）;
}
@覆盖
公共对象的getItem（INT位置）{
返回的位置;
}
@覆盖
众长getItemId（INT位置）{
返回的位置;
}
私有类ViewHolder {
的TextView TextView的;
}
@覆盖
公共查看getView（INT位置，查看convertView，ViewGroup中父）{
ViewHolder支架=无效;
如果（convertView == NULL）{
持有人=新ViewHolder（）;
convertView = inflater.inflate（R.layout.row，NULL）;
holder.textView =（TextView中）convertView
.findViewById（R.id.textview）;
convertView.setTag（保持器）;
} 其他 {
支架=（ViewHolder）convertView.getTag（）;
}
holder.textView.setText（arrayList.get（位置））;
返回convertView;
}
@覆盖
公共过滤用getFilter（）{
过滤器过滤器=新的过滤器（）{
@燮pressWarnings（未登记）
@覆盖
保护无效publishResults（CharSequence的约束，FilterResults结果）{
ArrayList的=（名单＆LT;字符串＆GT;）results.values; //有过滤后的值
notifyDataSetChanged（）; //通知新的过滤值的数据
}
@覆盖
保护FilterResults performFiltering（CharSequence的约束）{
FilterResults结果=新FilterResults（）; //保存过滤操作中值结果
名单＆LT;字符串＆GT; FilteredArrList =新的ArrayList＆LT;字符串＆GT;（）;
如果（mOriginalValues == NULL）{
mOriginalValues =新的ArrayList＆LT;字符串＆GT;（ArrayList中）; //保存在mOriginalValues原始数据
}
/ ********
*
*如果约束（CharSequence中接收到）为null返回mOriginalValues（原件）值
*人这样做了筛选，并返回FilteredArrList（过滤）
*
******** /
如果（约束== NULL || constraint.length（）== 0）{
//设置原始结果返回
results.count = mOriginalValues.size（）;
results.values = mOriginalValues;
} 其他 {
约束= constraint.toString（）与toLowerCase（）。
的for（int i = 0; I＆LT; mOriginalValues.size（）;我++）{
字符串数据= mOriginalValues.get（我）;
如果（data.toLowerCase（）。startsWith（constraint.toString（）））{
FilteredArrList.add（数据）;
}
}
//设置过滤结果返回
results.count = FilteredArrList.size（）;
results.values = FilteredArrList;
}
返回结果;
}
};
返回过滤器;
}
}
}
I'm trying to filter a listview with arrayadapter. The arraydapter parameter is a String[][]. The problem is that anything happens. I must override the Filter interface? In that case plase, can someone provide some hints?
Every position of the array I'm trying to filter is like
galleryValues[0][0] -> "tiulo"
[0][1] -> "desc"
[0][2] -> "etc"
I tryied to filter it:
lstContinente = (ListView)findViewById(R.id.list);
lstContinente.setTextFilterEnabled(true);
adapter = new PortaitArrayAdapter(cx,galleryValues);
lstContinente.setAdapter(adapter);
ed_busqueda.addTextChangedListener(new TextWatcher() {
public void afterTextChanged(Editable s) {}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
// TODO Auto-generated method stub
}
public void onTextChanged(CharSequence s, int start, int before, int count) {
adapter.getFilter().filter(s.toString());
adapter.notifyDataSetChanged();
}
});
The adapter code:
public class PortaitArrayAdapter extends ArrayAdapter<String> {
private final Context context;
private final String[][] values;
private List<Imagen> imagenes = null;
private LayoutInflater mInflater;
public ImageLoader imageLoader;
public PortaitArrayAdapter(Context context, String[][] values) {
super(context, R.layout.gallery_row);
this.context = context;
this.values = values;
mInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
imagenes = new ArrayList<Imagen>();
for (int i = 0; i < 20; i++) imagenes.add(new Imagen());
Bitmap def = BitmapFactory.decodeResource(this.context.getResources(),R.drawable.ic_launcher);
imageLoader=new ImageLoader(this.context,def, imagenes);
}
@Override
public int getCount (){
return this.values.length;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.gallery_row, parent, false);
holder.txtTitulo = (TextView) convertView.findViewById(R.id.txt_gallery_titulo);
holder.txtDesc = (TextView) convertView.findViewById(R.id.txt_gallery_desc);
holder.txtFecha = (TextView) convertView.findViewById(R.id.txt_gallery_fecha);
holder.txtEst = (TextView) convertView.findViewById(R.id.txt_gallery_est);
holder.imageView = (ImageView)convertView.findViewById(R.id.lst_img_gallery);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
/*LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(R.layout.gallery_row, parent, false);*/
//ImageView imageView = (ImageView) rowView.findViewById(R.id.icon);
Bitmap bmp;
Log.v("Position --> ",String.valueOf(position));
try {
byte b[] = imagenes.get(position).getImageData();
if (b != null) {
bmp = BitmapFactory.decodeByteArray(b, 0, b.length);
if (bmp != null) holder.imageView.setImageBitmap(bmp);
} else {
String urlBase = galleryValues[position][0].substring(0, galleryValues[position][0].lastIndexOf("/")+1);
String urlToEncode = galleryValues[position][0].substring(galleryValues[position][0].lastIndexOf("/")+1, galleryValues[position][0].length());
urlToEncode = URLEncoder.encode(urlToEncode,"UTF-8");
String url = urlBase.concat(urlToEncode);
url = url.replace("+", "%20");
Log.v("UrlFinal --> ",url);
imageLoader.DisplayImage(String.valueOf(position),url,act,holder.imageView, position,null);
}
} catch (Exception e) {
Log.e(this.getClass().getName(),"Exception en pos = " + position + " error:" + e.getMessage());
e.printStackTrace();
}
holder.txtTitulo.setText(galleryValues[position][1] + ", " + galleryValues[position][2]);
String[] dates = galleryValues[position][4].split("/");
String date = dates [1] + "/" + dates[0] + "/" + dates[2];
Date d1 = new Date(date);
DateFormat df = DateFormat.getDateInstance(DateFormat.LONG);
holder.txtDesc.setText(galleryValues[position][3]);
holder.txtFecha.setText(df.format(d1));
holder.txtEst.setText(getText(R.string.num_fotos_gallery) + galleryValues[position][5] + " - " + getText(R.string.num_videos_gallery) + galleryValues[position][6] + " - " + getText(R.string.num_exp_gallery) + galleryValues[position][7]);
return convertView;
}
}
private static class ViewHolder {
TextView txtTitulo;
TextView txtDesc;
TextView txtFecha;
TextView txtEst;
ImageView imageView;
}
解决方案
Covert your String array to ArrayList and pass it to Adapter and use below code or change below code with your String[]
You need to implement Filterable to your Adapter Class and Override getFilter()
Checkout this complete example for Filtering custom Adapter.
public class ListFilterActivity extends ListActivity {
private List<String> list = new ArrayList<String>();
List<String> mOriginalValues;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final MyAdapter adapter = new MyAdapter(this, getModel());
setListAdapter(adapter);
EditText filterEditText = (EditText) findViewById(R.id.filterText);
// Add Text Change Listener to EditText
filterEditText.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// Call back the Adapter with current character to Filter
adapter.getFilter().filter(s.toString());
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,int after) {
}
@Override
public void afterTextChanged(Editable s) {
}
});
}
private List<String> getModel() {
list.add("Linux");
list.add("Windows7");
list.add("Suse");
list.add("Eclipse");
list.add("Ubuntu");
list.add("Solaris");
list.add("Android");
list.add("iPhone");
list.add("Windows XP");
return list;
}
// Adapter Class
public class MyAdapter extends BaseAdapter implements Filterable {
List<String> arrayList;
List<String> mOriginalValues; // Original Values
LayoutInflater inflater;
public MyAdapter(Context context, List<String> arrayList) {
this.arrayList = arrayList;
inflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
return arrayList.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
private class ViewHolder {
TextView textView;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.row, null);
holder.textView = (TextView) convertView
.findViewById(R.id.textview);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.textView.setText(arrayList.get(position));
return convertView;
}
@Override
public Filter getFilter() {
Filter filter = new Filter() {
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,FilterResults results) {
arrayList = (List<String>) results.values; // has the filtered values
notifyDataSetChanged(); // notifies the data with new filtered values
}
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults(); // Holds the results of a filtering operation in values
List<String> FilteredArrList = new ArrayList<String>();
if (mOriginalValues == null) {
mOriginalValues = new ArrayList<String>(arrayList); // saves the original data in mOriginalValues
}
/********
*
* If constraint(CharSequence that is received) is null returns the mOriginalValues(Original) values
* else does the Filtering and returns FilteredArrList(Filtered)
*
********/
if (constraint == null || constraint.length() == 0) {
// set the Original result to return
results.count = mOriginalValues.size();
results.values = mOriginalValues;
} else {
constraint = constraint.toString().toLowerCase();
for (int i = 0; i < mOriginalValues.size(); i++) {
String data = mOriginalValues.get(i);
if (data.toLowerCase().startsWith(constraint.toString())) {
FilteredArrList.add(data);
}
}
// set the Filtered result to return
results.count = FilteredArrList.size();
results.values = FilteredArrList;
}
return results;
}
};
return filter;
}
}
}
这篇关于过滤器的ListView与arrayadapter的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
