Android Version

Distribution of installed Android-Versions:

• https://developer.android.com/about/dashboards

Changes within Android-Versions:

• https://de.wikipedia.org/wiki/Liste_von_Android-Versionen

Target SDK-Version

• https://www.heise.de/developer/meldung/Android-Apps-muessen-ab-Sommer-strengeren-API-Vorgaben-folgen-4315787.html
• https://android-developers.googleblog.com/2019/02/expanding-target-api-level-requirements.html
• https://developer.android.com/distribute/best-practices/develop/target-sdk

=> Target-SDK-Version has to be at least API-Level 28 to publish the application on the google play store

Decision for supported Android-Version:

• From Android 6.0 (API 23) there is an new permission-system, where the users can constraint Application-Permissions after installation
• Android 6.0 was released 4 years ago in 2015
• With minSDK-Verision 23 we can reach 74.8 Percent of the Android users
• In terms of Security it would even better to use Android 8.0 onwards, because lower versions are no longer supported and don´t have access to security updates
• But with Android 8.0 as minSDKVersion we only reach 38.7 Percent of the Android-Users
• We also have to test the Application for every API-Version on real devices, because several Interfaces like Blueotooth and GPS cannot be tested within an emulator