This document describes several restrictions placed on accessing data and system identifiers. These changes help protect users' privacy.
Some of these changes affect all apps running on Android Q while other changes affect only apps that target Android Q.
Changes affecting all apps
The following changes affect all apps running on Android Q, even if they target Android 9 (API level 28) or lower.
Starting in Android Q, the platform no longer keeps track of contacts affinity information. As a result, if your app conducts a search on the user's contacts, the results are no longer ordered by frequency of interaction.
The Contacts Provider guide contains a notice describing the specific fields and methods that are obsolete on all devices as of Android Q.
Randomized MAC addresses
Devices running on Android Q transmit randomized MAC addresses by default. If your app handles an enterprise use case, the platform provides several new APIs:
- Obtain randomized MAC address: Device owner apps and profile owner apps
can retrieve the randomized MAC address assigned to a specific network by
- Obtain actual, factory MAC address: Device owner apps can retrieve a
device's actual hardware MAC address by calling
getWifiMacAddress(). This method is useful for tracking fleets of devices.
Access to /proc/net filesystem
Android Q removes access to
/proc/net, which includes information about a
device's network state. Apps that need access to this information, such as VPNs,
should refer to the
Non-resettable device identifiers
Starting in Android Q, apps must have the
privileged permission in order to access the device's non-resettable
identifiers, which include both IMEI and serial number. Many use cases don't
need non-resettable device identifiers. If your app doesn't have the permission
and you try asking for information about the identifiers anyway, the platform's
response varies based on target SDK version:
- If your app targets Android Q, a
- If your app targets Android 9 (API level 28) or lower, the method returns
nullor placeholder data if the app has the
READ_PHONE_STATEpermission. Otherwise, a
If your app uses non-resettable device identifiers for ad-tracking or user analytics purposes, create an Android Advertising ID for those specific use cases instead. To learn more, see best practices for unique identifiers.
Access to clipboard data
Unless your app is the default input method editor (IME) or is the app that currently has focus, your app cannot access clipboard data.
Changes affecting apps targeting Android Q
The following change affects apps only if they target Android Q.
Access to USB serial requires user permission
If your app targets Android Q, your app can only read the serial number after the user has granted your app permission to access the USB device or accessory.