我是一个在Android的begginer,但我试图做一个自定义的listview过滤,我以某种方式工作。我唯一的问题是,我保存所有值(“原始”ArrayList)的ArrayList在每个过滤中的项目上越来越低。我无法解释这一点,但我认为你能以某种方式帮助我。在ListView中自定义过滤ArrayAdapter
反正这里是自定义ArrayAdaptor:
public class PkmnAdapter extends ArrayAdapter<Pkmn> {
private ArrayList<Pkmn> original;
private ArrayList<Pkmn> fitems;
private Filter filter;
public PkmnAdapter(Context context, int textViewResourceId, ArrayList<Pkmn> items) {
super(context, textViewResourceId, items);
this.original = items;//new ArrayList<Pkmn>();
this.fitems = items;//new ArrayList<Pkmn>();
}
@Override
public void add(Pkmn item){
original.add(item);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater vi = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.row, null);
}
Pkmn pkmn = original.get(position);
if (pkmn != null) {
TextView tt = (TextView) v.findViewById(R.id.RlabPName);
TextView dex = (TextView)v.findViewById(R.id.RlabDex);
ImageView img = (ImageView)v.findViewById(R.id.RimgPkmn);
if (tt != null) { tt.setText(pkmn.getName()); }
if (dex != null){ dex.setText(CalcDex(pkmn.getId())); }
if (img != null){
int resId = getContext().getResources().getIdentifier("dex" + pkmn.getId(), "drawable", "com.compileguy.pokebwteam");
img.setImageResource(resId);
}
}
return v;
}
@Override
public Filter getFilter()
{
if (filter == null)
filter = new PkmnNameFilter();
return filter;
}
private class PkmnNameFilter extends Filter
{
@Override
protected FilterResults performFiltering(CharSequence constraint)
{
FilterResults results = new FilterResults();
String prefix = constraint.toString().toLowerCase();
if (prefix == null || prefix.length() == 0)
{
ArrayList<Pkmn> list = new ArrayList<Pkmn>(original);
results.values = list;
results.count = list.size();
}
else
{
final ArrayList<Pkmn> list = original;
int count = list.size();
final ArrayList<Pkmn> nlist = new ArrayList<Pkmn>(count);
for (int i=0; i<count; i++)
{
final Pkmn pkmn = list.get(i);
final String value = pkmn.getName().toLowerCase();
if (value.startsWith(prefix))
{
nlist.add(pkmn);
}
}
results.values = nlist;
results.count = nlist.size();
}
return results;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
fitems = (ArrayList<Pkmn>)results.values;
clear();
int count = fitems.size();
for (int i=0; i<count; i++)
{
Pkmn pkmn = (Pkmn)fitems.get(i);
add(pkmn);
}
if (fitems.size() > 0)
notifyDataSetChanged();
else
notifyDataSetInvalidated();
}
}
private String CalcDex(int id){
String s = String.valueOf(id);
if (s.length() == 1)
s = "00"+s;
else if (s.length() == 2)
s = "0"+s;
return '#'+s;
}
}
注:列表视图中显示正确的项目,但时的exaple我在编辑框中删除信(触发过滤)这是问题开始的地方。
---编辑---
@Janusz:非常感谢您的回答。这解决了我的问题。
这里是源代码,为我的作品,因此,如果任何人有相同的问题,他们可以试试这个:
private ArrayList<Pkmn> original;
private ArrayList<Pkmn> fitems;
private Filter filter;
public PkmnAdapter(Context context, int textViewResourceId, ArrayList<Pkmn> items) {
super(context, textViewResourceId, items);
this.original = new ArrayList<Pkmn>(items);
this.fitems = new ArrayList<Pkmn>(items);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater vi = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.row, null);
}
Pkmn pkmn = fitems.get(position);
if (pkmn != null) {
TextView tt = (TextView) v.findViewById(R.id.RlabPName);
TextView dex = (TextView)v.findViewById(R.id.RlabDex);
ImageView img = (ImageView)v.findViewById(R.id.RimgPkmn);
if (tt != null) { tt.setText(pkmn.getName()); }
if (dex != null){ dex.setText(CalcDex(pkmn.getId())); }
if (img != null){
int resId = getContext().getResources().getIdentifier("dex" + pkmn.getId(), "drawable", "com.compileguy.pokebwteam");
img.setImageResource(resId);
}
}
return v;
}
@Override
public Filter getFilter()
{
if (filter == null)
filter = new PkmnNameFilter();
return filter;
}
private class PkmnNameFilter extends Filter
{
@Override
protected FilterResults performFiltering(CharSequence constraint)
{
FilterResults results = new FilterResults();
String prefix = constraint.toString().toLowerCase();
if (prefix == null || prefix.length() == 0)
{
ArrayList<Pkmn> list = new ArrayList<Pkmn>(original);
results.values = list;
results.count = list.size();
}
else
{
final ArrayList<Pkmn> list = new ArrayList<Pkmn>(original);
final ArrayList<Pkmn> nlist = new ArrayList<Pkmn>();
int count = list.size();
for (int i=0; i<count; i++)
{
final Pkmn pkmn = list.get(i);
final String value = pkmn.getName().toLowerCase();
if (value.startsWith(prefix))
{
nlist.add(pkmn);
}
}
results.values = nlist;
results.count = nlist.size();
}
return results;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
fitems = (ArrayList<Pkmn>)results.values;
clear();
int count = fitems.size();
for (int i=0; i<count; i++)
{
Pkmn pkmn = (Pkmn)fitems.get(i);
add(pkmn);
}
}
}
}
什么是 '清楚()' 和“添加()函数的工作。 –
@compileGuy,意思是“Pkmn”?我无法运行这个例子。你能完全上传代码吗? –
优秀的执行@compileguy, 通过适配器添加和清除功能,你不需要覆盖它们。 pkmn是一个模型类来保存列表中的数据值 – Naruto