本文介绍了方法“onItemSelected”在数组适配器和片段中都不起作用的处理方法,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
方法 onItemSelected
不起作用,我不知道原因。
The method onItemSelected
doesn't work and I don't know why.
以下是我的代码。
数组适配器:
public class MyListAdapter extends ArrayAdapter {
Spinner spinner;
ListView listView;
/*public MyListAdapter(Context context, int textViewResourceId) {
super(context, textViewResourceId);
}*/
public MyListAdapter(Context context) {
super(context, R.layout.single_listview_item);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
spinner = (Spinner) convertView.findViewById(R.id.simpleSpinner);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
getContext(),
R.array.country_arrays,
android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
System.out.println("ciao1");
// spinner.setOnItemSelectedListener(this);
return row;
}
/* @Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String selState = (String) spinner.getSelectedItem();
System.out.println(selState);
Toast.makeText(
getContext(),
"Clicked on Planet: " + selState + "", Toast.LENGTH_SHORT).show();
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}*/
}
片段:
ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_list2, container, false);
listView = (ListView) rootView.findViewById(R.id.listview);
ListAdapter listAdapter = new MyListAdapter(getContext());
listView.setAdapter(listAdapter);
// listView.setOnItemClickListener(this);
listView.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
{
public void onItemSelected(AdapterView<?> parent, View view, int position, long i)
{
listView.setSelection(position);
String selState = (String) listView.getSelectedItem();
Toast.makeText(
getContext(),
"Clicked on Planet: " + selState + "", Toast.LENGTH_SHORT).show();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
推荐答案
在ListViews上使用onItemClicked。 OnItemSelected适用于Spinners。这是Android的滋扰之一......
On ListViews you use onItemClicked. OnItemSelected is for Spinners. It's one of those Android nuisances...
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