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I want to create an system application(while installing it will ask user permission to make it as system app) for UN-rooted application. As I am not familiar in android, please tell me how to create it.
Thanks in advance.
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A System application is merely an application that is placed under /system/app folder in an Android device. An application can only be installed in that folder if we have access to the OS’s ROM (system.img). The application is placed under /app folder after the ROM has been extracted.
This section describes how to build a simple Android app. First, you learn how to create a "Hello, World!" project with Android Studio and run it. Then, you create a new interface for the app that takes user input and switches to a new screen in the app to display it.
In order to make an app as a system app, it needs to be installed in “/system/app/” folder. The system partition of the emulator is read-only and you may not be able to do an adb push directly. To make the system partition writable, we need to restart the emulator with “-writable-system” flag
Having installed an app from the Play Store or sideloading an APK, you can easily convert user apps into systems apps. There are two different types of Android apps: system apps and third-party apps. System apps are the ones responsible for the core functionality of the Android System.
True system apps are baked into the ROM image, and signed with the same key the ROM was signed with, giving them extra access to the system.
You cannot add a new system app on the same level without updating the ROM image of the device, and even then you'll need the OEM key to sign your app and you will have to request them to include it in their ROM.
Having a rooted device allows standard apps to gain extra access without being system apps.
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