Set initial value to AutoCompleteTextView

Question

Case: I have a screen (EditActivity) with a product creating/editing form. This screen has a layout in which there is a drop-down list product category. The list of items in this drop-down is set via ArrayAdapter.createFromResource. I don't have a problem when I use this screen as a creating form. The problem appears when I use this screen as a editing form. I'm trying to set the product category initial value to the field via setText(). It works, and value appears in the dropdown. But other values from the ArrayAdapter disappear and I can't choose them. I also tried to set value using setSelection(), but I'm not sure this is correct way.

Question: How do I insert the initial value into the dropdown so that I can see and select another values from the list?

EditActivity layout part

<com.google.android.material.textfield.TextInputLayout
    android:id="@+id/productCategory"
    android:hint="@string/ed_product_category"
    ...
    style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox.ExposedDropdownMenu">

    <AutoCompleteTextView
        android:id="@+id/productCategoryAutoComplete"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="none"/>

</com.google.android.material.textfield.TextInputLayout>

Setting list items to autocompletefield. This code is executed inside onCreate method of EditActivity.

productCategoriesAutoCompleteView = findViewById(R.id.productCategoryAutoComplete);
ArrayAdapter<CharSequence> arrayAdapter = ArrayAdapter.createFromResource(
   this,
   R.array.product_categories,
   R.layout.list_item
);

productCategoriesAutoCompleteView.setAdapter(arrayAdapter);

How I'm trying to set initial value 1 (work but not as expected)

int itemPosition = arrayAdapter.getPosition("Car");
productCategoriesAutoCompleteView.setText(arrayAdapter.getItem(itemPosition));

How I'm trying to set initial value 2 (looks like doesn't work)

int itemPosition = arrayAdapter.getPosition("Car");
productCategoriesAutoCompleteView.setSelection(itemPosition);

Field in creation form

Field in updating form

What I want in updating form

Answer 1

setText() method has second optional boolean parameter - filter. This param is used to filter items from array adapter.