How to set android:popupBackground border size/padding?

Question

I wanted to set the background color of a Spinner in Android Studio and have been able to do so with the following code:

<Spinner
    android:id="@+id/StreamSpinner"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_centerVertical="true"
    android:background="#D2B450"
    android:popupBackground="#D2B450">
</Spinner>

The issue is that when I added android:popupBackground="#D2B450" it put some borders/padding around the selection box which were not there before I added that line. Before I added that line, the selection box with the content was with a white background and no padding/borders.

I have not been able to find out how to remove this while retaining the background color I need (#D2B450).

This is what it looks like with the line in place to set the popupBackground (see black borders)

and this is what it looks like without that line:

Can anyone point me in the right direction to remove the borders?

Thanks.

Answer 1

You can try to set it programmatically:

<color name="spinner_background">#D2B450</color>

spinner2.setPopupBackgroundResource(R.color.spinner_background);

Option 2:

If still not working, there is a workaround to create a custom item layout; set it in android:background; and fix the ripple effect in android:foreground.

spinner_item.xml

<?xml version="1.0" encoding="utf-8"?>
<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/text1"
    style="?android:attr/spinnerDropDownItemStyle"
    android:layout_width="match_parent"
    android:layout_height="?attr/dropdownListPreferredItemHeight"
    android:foreground="?attr/selectableItemBackground"
    android:ellipsize="marquee"
    android:singleLine="true" />

And set that to the spinner adapter:

adapter.setDropDownViewResource(R.layout.spinner_item);

• The drawback that the ripple effect will work only on API-23+