Android: Cannot style spinner divider

Question

I\'m trying to create a theme for my first Android app, and it is driving me round the bend. I finally managed to figure out how to style items in a dropdown list, but now I

Answer 1

I have a very simple Activity with the Spinner and it works for the following. The only difference I see is that you have a <item name="android:height">3dp</item> and I don't have that at all.

<style name="TestSpinnerStyle" parent="android:style/Widget.ListView.DropDown">
    <item name="android:divider">#ff0000</item>
    <item name="android:dividerHeight">5dp</item>
</style>


<style name="SampleTheme" parent="@android:style/Theme.Holo.Light">
    <item name="android:dropDownListViewStyle">@style/TestSpinnerStyle</item>
</style>

and in my Activity I have:

    Spinner spinner = (Spinner) findViewById(R.id.spinner);
    List<String> list = new ArrayList<String>();
    list.add("list 1");
    list.add("list 2");
    list.add("list 3");
    ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_spinner_item, list);
    dataAdapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
    spinner.setAdapter(dataAdapter);

and then for the main layout I have the following XML:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent"
        >
    <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="Hello World, StylingActivity"
            />
    <Spinner android:id="@+id/spinner"
             android:layout_width="250dp"
             android:layout_height="40dp"
             />
</LinearLayout>

Here is the screenshot

If you can't get it to work from there, I can push up the entire thing to a github repo for you.

Answer 2

You could add a horizontal line to the dropdown layout you use, which would effectively create a divider.

EDIT

Some further searching found this:

SO Answer

Which basically says what you show you are trying to do above should work... although it mentions setting that style in your activity theme and you don't mention doing that.

Answer 3

The style method in the accepted answer works well until you need two spinners with different divider colors.

Here is what I found works as an alternative:

a) Set the popupBackgroundColor attribute on the spinner to the color you want for the divider. This will color the entire list item's background (including the space we think of as the divider).

b) Set the spinners adapters dropDownViewResource to be a CheckedTextView with it's background attribute set to some other color (or a selector if you want the selected items to have a different color). This will override the color we set in step a for everything but the divider. effectively giving us the desired result.

So you will have:

drawable/spinner_dropdown_background_selector:

<?xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@color/your_unchecked_color" android:state_checked="false"/>
    <item android:drawable="@color/your_checked_color" android:state_checked="true"/>
    <item android:drawable="@color/your_unchecked_color"/>

</selector>

layout/drop_down_item.xml:

<?xml version="1.0" encoding="utf-8"?>
<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
             android:id="@android:id/text1"
             android:background="@drawable/spinner_dropdown_background_selector"
             android:textColor="@android:color/white"
             android:singleLine="true"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:ellipsize="marquee" />

Your spinner definition:

<Spinner
        ...
        android:popupBackground="@color/your_divider_color"            
        ...
        />

And finally your array adapter definition:

ArrayAdapter<String> dataAdapter = new ...
dataAdapter.setDropDownViewResource(android.R.layout.drop_down_item);
spinner.setAdapter(dataAdapter);

Please note that setting the popupBackgroundColor has no effect if the spinner is in dialog mode.

Answer 4

You can do it in your layout.xml

     <Spinner
                android:id="@+id/sp_to_create"
                android:layout_width="match_parent"
                android:layout_height="32dp"
                android:layout_marginBottom="10dp"
                style="@style/spinner_style"
                android:prompt="@string/to_type_prompt" />

XML STYLES ADD it

 <style name="spinner_style" parent="Widget.AppCompat.ListView.DropDown">
    <item name="android:divider">#d1d1d1</item>
    <item name="android:dividerHeight">0.5dp</item>
</style>

Add to your Activity Theme

      <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
            <item name="android:dropDownListViewStyle">@style/spinner_style</item>
</style>

JAVA FILE

your_spinnerList.setAdapter(new ArrayAdapter<>(getActivity(), android.R.layout.simple_dropdown_item_1line, timeOff_type_list));

Let me know if it had been useful for you! Have a nice day!