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To show a spinner on an Android Studio background image, follow these steps:

1. Add a ProgressBar widget in your layout XML file where you want to show the spinner. For example:

   <RelativeLayout
      android:id="@+id/main_layout"
      android:layout_width="match_parent"
      android:layout_height="match_parent">
   
      <ImageView
          android:id="@+id/background_image"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:src="@drawable/background_image" />
   
      <ProgressBar
          android:id="@+id/spinner"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_centerInParent="true" />
   
   </RelativeLayout>
   

2. In your activity or fragment, find the spinner widget using its ID and call its setVisibility method to show or hide the spinner. For example:

   ProgressBar spinner = findViewById(R.id.spinner);
   spinner.setVisibility(View.VISIBLE);  // Show spinner
   spinner.setVisibility(View.GONE);     // Hide spinner
   

3. You can also customize the spinner using its style attributes. For example, you can change its size and color by adding these attributes to the ProgressBar widget:

   <ProgressBar
      android:id="@+id/spinner"
      android:layout_width="96dp"
      android:layout_height="96dp"
      android:layout_centerInParent="true"
      android:indeterminateTint="@color/spinner_color"
      android:indeterminateTintMode="src_in"
      android:style="?android:attr/progressBarStyleLarge" />
   

   Here, android:indeterminateTint and android:indeterminateTintMode set the spinner color, and android:style sets the spinner size and style.