There are detailed steps to follow when installing Android on Raspberry Pi. Turn on your Raspberry Pi, and Android will boot, and it may be slow; however, the performance should be steady. Once turned on, you can open the usual default Android apps and get online via the pull-down menu. If Raspberry is linked to your network via Ethernet, this has been accomplished, and you should use the Wi-Fi.
This situation is when the operating system is running, and it is functional, and if you want to install apps, press sideload, importing, Android APK files from external storage or a cloud drive. Installing an APK file from your cloud storage, open the storage browser, and download the APK file. Once it is downloaded, the notification bar at the top of the screen should be dragged down. Select the APK file to install it.