From then on, many apps consisted of a base APK and several others that included information related to the language of the app, the supported screen dimensions, and the required CPU architecture. When a developer publishes an app on Google Play, it is 'disassembled' into several pieces called split-APKs.

Later on, Google started using a dynamic distribution system, the so-called Android App Bundle. Therefore, the most convenient solution was to insert the APK and OBB data into the same file and have it installed by an external tool. That change complicated things when manually installing apps by having to install these additional files separately in specific folders on the device. OBB data (a file that includes extra multimedia files within the app such as video or audio) turned out to be the way to exceed the maximum size allowed by Google for uploading APKs to its platform. This was true until the arrival of other standards that added complexity to the process. A short while ago, installing an app using an external APK involved simply clicking on it and letting the package installer included by default in your Android do all the work. The way to install and download apps has evolved over time. ■ Send apps to nearby devices connected to the same network ■ Browses your smartphone’s folders using an integrated file browser You can forget about its internal structure - search, install and go! ■ Installs any APK or XAPK in your smartphone’s memory. ■ Automatically searches for all the apps installed on your Android and creates backup copies. This app works both ways so you can create backups of your installed apps and install the private copies in your smartphone, regardless of the packaging format. It uses the standard XAPK packaging to support the new APK distribution system used by Google, the so-called APK split.

APK installer is a free tool that lets you install Android apps that use formats that are not detected by the default package installer included in the operating system.

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