Simple Android Application update logic component

When upgrading a database, you get callbacks such as onUpgrade(oldVersion, newVersion). But, these are only useful and usable when you are dealing with database migrations. What about when you need to upgrade SharedPreferences, switch from SQLite to Realm, etc? Lift aims to fill those gaps and allow an upgrade path for any possible app version upgrade you might need, making use of the apps version code.

//Within Application.onCreate()
Lift.check(this, { oldVersion, newVersion ->
    if (oldVersion == Lift.VERSION_NOT_STORED) {
        Toast.makeText(this@App, "This must be a first app launch. Nice", Toast.LENGTH_SHORT)
                .show()
    } else if (oldVersion == 100 && newVersion == 101) {
        Toast.makeText(this@App, "Upgrading from 100 to 101", Toast.LENGTH_SHORT)
                .show()
    }
})

Even if you do not have a needed upgrade right away, you should add the check and callback to your app so that it starts tracking the current version of the app for when you do eventually want to provide an upgrade.

If you are using auto backup, you will want to add rules for Lift. See the sample project for a full example, but it should look like this:

Change your manifest to android:fullBackupContent="@xml/my_backup_rules"

And your my_backup_rules should look like:

<?xml version="1.0" encoding="utf-8"?>
<full-backup-content>
    <exclude domain="sharedpref" path="lift.xml"/>
</full-backup-content>

Due to the way that the version is stored in SharedPreferences, if you are adding Lift to an existing app, and also for the first time the user launches your app, the first callback will have the oldVersion value is equal to VERSION_NOT_STORED (-1). Make sure you are accounting for this as needed

Copyright 2017 Commit 451

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