Personal data is any kind of data that could identify an individual:
The FTC, in the US, requires all apps that collect and use personal information from users to properly inform about the collection and use of users' personal information.
The FTC has provided guidance for developers and businesses on what to be aware of to ensure compliance.
This requirement applies to all app stores, including iOS and Android:
Depending on your mobile app and your business, you may be subject to other legal requirements:
But the Google Play Developer distribution agreement of Google - which must be read and agreed to when you sign-up up for a Google Play account - informs you that you're required to have "privacy procedures and notices in place".
You agree that if you use the Store to distribute Products, you will protect the privacy and legal rights of users. If the users provide you with, or your Product accesses or uses, user names, passwords, or other login information or personal information, you must make the users aware that the information will be available to your Product, and you must provide a legally adequate privacy notice and protection for those users.
It just doesn't matter if your business operates a simple website or a mobile game.
Before you add the URL make sure you know which third parties tools you are using through the app that may collect personal data from users for you.
You can choose not to collect the data yourself through your Android app, but a third party you've partnered with (signed up an account with) can collect this data and report it back to you. This gives you access to personal information of users.
Flurry does the same thing in Flurry Analytics' Terms of Service:
Here are some examples of Android apps and how they integrated their Privacy Policies in their apps.
This is the Settings screen on Dropbox Carousel app that shows the "Legal & Privacy" menu item:
The dialog window allows the user to choose what agreement to read:
Users are able to view the contents of this legal agreement from Flipboard. The page places a convenient option for users to download Flipboard by placing a "Get the App" button:
Their web page conveniently places a "Get the App" button that allows users to open Google Play and install the app, like Flipboard does:
This is a good example of how Android developers can make it convenient for users to download an app after reading the legal agreement users will be bound to.
Once a user downloaded, installed and signed up for Pinterest, the "Terms and privacy" link is always conveniently made available at the main "Settings" icon: