Did you get one of these Google Play Developer Policy Violation Emails?
Worry not, generate a Privacy Policy for your android app:

• Take a look at App Privacy Policy Generator, a web app to generate a generic privacy policy for your app.

It is fair simple.
Add you app name, select the dev type and enter your company name or your real name if you are a individual developer.

Now select the services on the right you are using in your app.

Tap on the button “Generate” and you see your privacy site.

Scroll down to the bottom and select “Download HTML“.
Upload it to your webspace and link this website inside the Google Play Developer Console.

That’s it.

Another more detailed solution (not free) is the website https://www.iubenda.com!
You have to pay yearly for this service but you get always a updated privacy policy and you can generate also policies for websites and other services.