Study note and activity record

  When you press the “Back” button, the screen of the app goes to the previous page(fragment or activity). However, if you want to have a custom behaviour (For example, pop up a dialog to ask the user to confirm again to exit when you are uploading something.) when you press the button. You can look at the steps below.  You can also implement custom behaviour for the “navigation up” button of the Navigation component on the action bar.

T here are 2 problems encountered when I study the conditional navigation through the Android developer site: Incompatible types (super Object) and failing to navigate to the login fragment. I write down here to remind myself and hopefully, may help other beginners of Android app development  with the same problems.

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