Java – Android Spinner project layout for default entries in XML

Android Spinner project layout for default entries in XML… here is a solution to the problem.

Android Spinner project layout for default entries in XML

I have two spinner widgets. One of them is populated at run time.

groupSpinner.setAdapter(new ArrayAdapter<>(this,
                 android. R.layout.simple_spinner_item, groupNames));

The other uses an array of strings to pre-populate the XML layout.

<Spinner ...
    android:entries="@array/my_items_here" />

Both spinner looks good. However, when their items are displayed, the child layouts do not match in both dropdown and dialog modes.
I must have missed something very simple, but how can I set them up to use the same layout (hopefully android. R.layout.simple_spinner_item), or do I load an array of XML strings at runtime?

It seems like a basic thing, but I can’t find the answer, and I’ve searched a lot.

See screenshot below

Programmatically Populated Spinner
XML Pre-populated Spinner

*Please forgive the use of Greek characters in the second picture. I have checked and confirmed that the problem is not related to the use of Greek characters.


Try this ((ArrayAdapter)preFilledSpinner.getAdapter()).setDropDownVie wResource(android.R layout.simple_spinne‌ r_item);

To understand how it works, just examine the code for AppCompatSpin, below is the default code for AppCompatSpinner to see how it works when you pass an entry

final CharSequence[] entries = a.getTextArray(R.styleable.Spinner_android_entries);
if (entries != null) {
    final ArrayAdapter<CharSequence> adapter = new ArrayAdapter<>(context,android. R.layout.simple_spinner_item, entries);

When we pass the entry through XML, they will create an ArrayAdapter and apply the code adapter.setDropDownViewResource(R.layout.support_simple_spinner_dropdown_item); You can see that R.layout.support_simple_spinner_dropdown_item is the default setting, which should work for the parameters but unfortunately they have been fixed

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