Android 9 Development Cookbook - Third Edition

How it works...

Before we call the BlockedNumberContract APIs, we check to make sure we have permission by calling canCurrentUserBlockNumbers(), as shown in this code:

if (BlockedNumberContract.canCurrentUserBlockNumbers(this)) {

If true, we make the actual API call.

Important: Only the following apps can read and write to the BlockedNumber provider: the default SMS application, the default phone app, and carrier apps. The user can choose their default SMS and Phone app.

Adding and deleting numbers from the BlockedNumber list uses the standard Service Provider format. 

The Update method is not supported; use the Add and Delete methods instead.

To check whether a number is already in the block list, call the isBlocked() method, passing in ...