I2P-installation failed
I2P(net.i2p.android.router) cannot be installed on AOSP-based Android 9 in the recent few versions, while the versions (net.i2p.android) provided by I2P's own repo can be installed with some bugs (crash when starting foreground notification) though. It seems the app doesn't handle notifications correctly (bad notification error) on API 28; not sure if it's related to the issue of installation failure.
Edited by Kuichi Fujiwara