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Build app for Android 11

See original GitHub issue

Avoid duplicates

This enhancement request has not already been raised before
Enhancement request is specific for Android only, for general issues / questions that apply to iOS and Android please raise them in CWA-Wishlist
If you are proposing a new feature, please do so in CWA-Wishlist

Current Implementation

The Android version of the Corona-Warn-App version 2.2.x is built with targetSdkVersion 29 equivalent to Android 10. This is true also for branches release/2.3.x ~~and release/2.4.x~~ intended for future releases.

Suggested Enhancement

Update the Android CWA release to build against API 30 (Android 11).

Expected Benefits

According to https://developer.android.com/distribute/best-practices/develop/target-sdk “Starting in November 2021, app updates will be required to target API level 30 or above and adjust for behavioral changes in Android 11.” (Thanks to @PhilippNowak96 for this link.)

Since the release of the first version of CWA in June 2020, last year, Android has released Android 11. Apart from new devices being released with Android 11 from the beginning, also mid-range Android 10 devices such as Samsung Galaxy A50 devices, previously running Android 10, are being offered Android 11 firmware updates.

In addition Android 12 became available as a beta release in May 2021 (see https://developer.android.com/about/versions/12). The SDK is labelled “S Preview”.

~~Advanced users may be migrating to Android 12 beta and observe compatibility problems if targetSdkVersion 29 is not updated.~~ (Uncertain if this statement is true.)