How to update an Spinner dynamically correctly?
-
12-11-2019 - |
Question
I have a spinner with a custom adapter displaying objects from a database. When the object list changed I create a new adapter with the List and apply it on the spinner. Afterwards the first item is selected, so I tried this:
// 5th item selected
int pos = spinner.getSelectedItemPosition();
spinner.setAdapter(newAdapter);
// 0th item selected
spinner.setSelectedItem(pos);
// 5th item is selected
But the GUI does still show the first item?
spinner.invalidate()
did not help.
Is this the correct way to achieve what I want? I really could not find any information on this behavior.
Solution
Solved: I guess the main problem was the custom spinner adapter. This works fine now
if (spinner.getCount() > 0) {
pos = spinner.getSelectedItemPosition();
}
MySpinnerAdapter adapter = new MySpinnerAdapter(context, myNewObjects);
spinner.setAdapter(adapter);
spinner.setSelection(pos); // needed
adapter.notifyDataSetChanged();
OTHER TIPS
spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
spinner.setSelectedItem(5);
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
Did u tried notifydatasetChanged()
or notifydatasetInvalidate()
method of adapter.
newAdapter.notifydatasetChanged()
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