FragmentActivity
Default constructor for FragmentActivity. All Activities must have a default constructor for API 27 and lower devices or when using the default android.app.AppComponentFactory.
Alternate constructor that can be used to provide a default layout that will be inflated as part of super.onCreate(savedInstanceState)
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This should generally be called from your constructor that takes no parameters, as is required for API 27 and lower or when using the default android.app.AppComponentFactory.