Android Spinner: Remove Extra White Space Between Text and Dropdown Icon

Simply just add the following attribute to your spinner xml element:

For API < 17:

android:gravity="right"

For API => 17:

android:gravity="end"

I did it myself after playing with Spinner. Here is the solution which worked pretty well.

First create a Dropdown with indicator image of your choice.

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
    <shape
        android:shape="rectangle"/>
</item>
<item
    android:width="24dp"
    android:height="24dp"
    android:gravity="right|center_vertical">
    <bitmap
        android:src="@drawable/ic_dropdown"
        android:tint="@color/colorPrimaryDark"/>
</item></layer-list>

Then assign it to the background of Spinner.

<Spinner
        android:id="@+id/basket_spinner_item_quantity"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:spinnerMode="dropdown"
        android:padding="0dp"
        android:background="@drawable/ic_spinner_dropdown"/>

Now, adjust the padding and alignment of spinner item as per your requirement.

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/simple_spinner_text_quantity"
android:paddingTop="5dp"
android:paddingBottom="5dp"
android:paddingLeft="20dp"
android:paddingRight="25dp"
android:gravity="right"
android:textAlignment="gravity"/>

set gravity to end and adjust it with an appropriate value :

  android:gravity="end"
  android:paddingEnd="20dp"