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In Android, when the back button clicked, app will navigate to previous page that should be closed. Take tutorial "Build a Mobile App in 5 min" as an example, I go through: 1.
- What does the back button do on Android?
- How do I know if my back button is clicked on Android?
- How do I click back on Android?
- What method is invoked when the user of an Android app presses the device's back button?
What does the back button do on Android?
The back button is used to move backward from the previously visited screen by the user. Most Android devices have a dedicated back button still a back button on the action bar enhances the user experience.
How do I know if my back button is clicked on Android?
In order to check when the 'BACK' button is pressed, use onBackPressed() method from the Android library. Next, perform a check to see if the 'BACK' button is pressed again within 2 seconds and will close the app if it is so. Otherwise, don't exit.
How do I click back on Android?
Move between screens, webpages & apps
You can go back more than once. But when you reach the Home screen, you can't go back any further. Gesture navigation: Swipe from the left or right edge of the screen. 2-button navigation: Tap Back .
What method is invoked when the user of an Android app presses the device's back button?
This is an override function called when the user presses the back button on an Android device. It has great implications on the activity lifecycle of the application. The official documentation states that onBackPressed() method is called when the activity has detected the user's press of the back key.
