--how to interact with Android Spinner
//click on the Spinner Element - which has down arrow icon: ( using any locator). i am using the id:
driver.findElement(By.id("com.example.android.contactmanager:id/contactPhoneTypeSpinner")).click();
//wait for the options to come up:
// and click on any of the options by a locator: I am using Name in this case:
driver.findElement(By.name("Work")).click();
I have used UI Automator to find all details regarding locators and Element types.