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A few questions :
What implications does upgrading an app have on stored data i.e. Preferences and database? Does the system perform a clean install of the new version(i.e. remove the older version and then install the new) or something else?
What if the user wants to retain the stored data- say values in the shared preference or a sqlite database?
How can I emulate this app-update-install scenario? If I have a version 'x' installed on my emualator and I do a adb install of version 'x+1' I am getting INSTALL_FAILED_ALREADY_EXIST error. Should I try hosting the new apk on a Web server, will the Package Manager take this as an update?
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Master the LanguageJava and XML are the two main programming languages used in Android App development. Knowledge and mastery over these programming languages are, therefore, prerequisites to developing an Android app.
Android Development is low cost and provides high ROI. Since Android has a huge number of clients from increasingly diverse backgrounds, applications are less expensive. Most of the applications are free to download and are also easily available on the play store in comparison to another operating system.
Android apps can be written using Kotlin, Java, and C++ languages. The Android SDK tools compile your code along with any data and resource files into an APK or an Android App Bundle.
Android software development is the process by which applications are created for devices running the Android operating system. Google states that "Android apps can be written using Kotlin, Java, and C++ languages" using the Android software development kit (SDK), while using other languages is also possible.
Android is a platform that is easier to master for developers having varying skill levels. Mobile app development services can utilize Android with much greater ease than any other platform. Android uses Java which is a programming language that most developers are intimately familiar with.
Following are two types of flags to run an application in Android: FLAG_ACTIVITY_NEW_TASK. FLAG_ACTIVITY_CLEAR_TOP.
onUpgrade(). For all others you're responsible of updating them to the new version, if needed.adb install -r /path/to/newApk.apk (notice the -r flag, which tells adb to reinstall). Basically, the workflow should be the following:.
adb uninstall my.package
adb install /path/to/old.apk
# play with app, set preferences, databases, etc.
adb install -r /path/to/new.apk
# watch your app crash in an impressive ball of fire
# fix stuff
# goto 0
Other notes: Yes, the app performs a clean removal of your app before installing the new version. As I said, however, your app's data is not removed. Still, you have to be careful, because this removal causes a few things:
NotificationManager, alarms set via the AlarmManager, etc. I'm not sure what happens to any widgets you might have (never worked with widgets).
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