How It Works
In your app, you include a small client library that communicates to the Google Play Services APK (application package). When you make a call, it actually sends a message to the service, which does the operation on your behalf.
Every app talks to the same Services APK, which is updated frequently from the Google Play Store. This design allows Google to push fixes and new functionality directly to your phone or tablet without having to wait for Android system updates and carrier approvals. It also saves space because each app doesn’t have to contain a repeat of the same code.
One of the most frequently used features provided by Google ...
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