[英]Get value from selected item in AltertDialog listview
I have alter dialog that contains listview with custom adapter populated by some items. 我有一个对话框,其中包含带有由某些项目填充的自定义适配器的listview。 Each item has a name and id.
每个项目都有一个名称和ID。
This is item holder: 这是物品架:
public class TOperaterHolder {
private String NazivOperatera;
private String IDOperater;
public TOperaterHolder(String nazivOperater, String idOperater) {
this.NazivOperatera = nazivOperater;
this.IDOperater = idOperater;
}
public String getNazivOperatera() {
return NazivOperatera;
}
public void setNazivOperatera(String nazivOperatera) {
NazivOperatera = nazivOperatera;
}
public String getIDOperater() {
return IDOperater;
}
public void setIDOperater(String IDOperater) {
this.IDOperater = IDOperater;
}
}
and this is the custom adapter: 这是自定义适配器:
public class CustomAdapterTOperateri extends BaseAdapter {
ArrayList<TOperaterHolder> mData;
Context mContext;
LayoutInflater inflater;
public CustomAdapterTOperateri(ArrayList<TOperaterHolder> data, Context context) {
mData = data;
mContext = context;
inflater = LayoutInflater.from(mContext);
}
public class ViewHolder {
TextView txtNazivTOperater;
}
@Override
public int getCount() {
return mData.size();
}
@Override
public TOperaterHolder getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View view, ViewGroup parent) {
if (view == null) {
LayoutInflater mInflater = (LayoutInflater) mContext
.getSystemService(mContext.LAYOUT_INFLATER_SERVICE);
view = mInflater.inflate(R.layout.inflate_red, null);
}
TextView tvTitle = (TextView) view.findViewById(R.id.txtNazivTOperater);
View v = (View) view.findViewById(R.id.listViewTOperater);
tvTitle.setText(mData.get(position).getNazivOperatera());
return view;
}
}
This part is placed in activity where I have method to show alter dialog with listview: 这部分放在活动中,在这里我有方法显示带listview的alter对话框:
private void AlertListItems()
{
AlertDialog.Builder dialog = new AlertDialog.Builder(IzborRazduzivanje.this);
dialog.setTitle("List Title");
View customView = LayoutInflater.from(IzborRazduzivanje.this).inflate(
R.layout.inflate, null, false);
ListView listView = (ListView) customView.findViewById(R.id.listViewTOperater);
ArrayList<TOperaterHolder> itemList = new ArrayList<TOperaterHolder>();
itemList.add(new TOperaterHolder("J", "1"));
itemList.add(new TOperaterHolder("B", "2"));
itemList.add(new TOperaterHolder("C", "3"));
CustomAdapterTOperateri mAdapter = new CustomAdapterTOperateri(itemList, IzborRazduzivanje.this);
listView.setAdapter(mAdapter);
listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
dialog.setView(customView);
dialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
});
dialog.show();
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
TOperaterHolder item = (TOperaterHolder)adapterView.getItemAtPosition(i);
System.out.println("Selected item: " + item.getIDOperater());
}
});
}
When the alert dialog is open I see all three items but when I click on any of them I get an error like 当警报对话框打开时,我会看到所有三个项目,但是当我单击它们中的任何一个时,都会出现类似的错误
java.lang.NullPointerException: TOperaterHolder.getIDOperater()' on a null object reference
java.lang.NullPointerException:空对象引用上的TOperaterHolder.getIDOperater()'
What could be wrong here? 这有什么问题吗?
Use 采用
TOperaterHolder item = itemList.get(i);
instead of 代替
TOperaterHolder item = (TOperaterHolder)adapterView.getItemAtPosition(i);
in the onItemClickListener
在
onItemClickListener
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