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In your activity override onSupportNavigateUp and onBackPressed: This solution has the advantage, that the navigation destination fragments don’t need to worry about the unregistering of their listeners as soon as they are detached.
To use this handy feature for a new project, first fire up Android Studio. Enter the application name and click the Next button. You can leave the defaults as they are in the Target Android Devices dialog. Click the Next button again. In the Add an Activity to Mobile dialog, select Bottom Navigation Activity. Click the Next button again after that.
Do you need a back button on Android?
Back navigation is how users move backward through the history of screens they previously visited. All Android devices provide a Back button for this type of navigation, so you should not add a Back button to your app’s UI.
How to enable back button in Android WebView?
This example demonstrate about How to enable back button in android webview. Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project. Step 2 − Add the following code to res/layout/activity_main.xml.
Android has a hardware back button. Pressing the haradware back button will navigate to the previous. I don’t think you need a custom back button. I don’t think its a good programming practice to override the default behaviour. You create a backbutton in your activity and implementing the functionality as you have done above.
Note that the OnBackPressedCallback only seems to work for providing custom back behavior to the built-in software/hardware back button and not the back arrow button/home as up button within the actionbar/toolbar. To also override the behavior for the actionbar/toolbar back button I’m providing the solution that’s working for me.
Which is the navigation component in Android 1.0?
A little late to the party, but with the latest release of Navigation Component 1.0.0-alpha09, now we have an AppBarConfiguration.OnNavigateUpListener.