Question
How can I make an Android activity require a double back button press to exit the application?
@Override
protected void onBackPressed() {
if (doubleBackToExitPressedOnce) {
super.onBackPressed();
return;
}
this.doubleBackToExitPressedOnce = true;
Toast.makeText(this, "Please click BACK again to exit", Toast.LENGTH_SHORT).show();
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
doubleBackToExitPressedOnce=false;
}
}, 2000); // Reset the flag after 2 seconds
}
Answer
Implementing a double tap back button exit functionality in an Android app improves user experience by preventing accidental exits. This behavior can be easily coded within the activity without requiring advanced programming concepts.
@Override
protected void onBackPressed() {
if (doubleBackToExitPressedOnce) {
super.onBackPressed();
return;
}
this.doubleBackToExitPressedOnce = true;
Toast.makeText(this, "Please click BACK again to exit", Toast.LENGTH_SHORT).show();
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
doubleBackToExitPressedOnce=false;
}
}, 2000); // Reset the flag after 2 seconds
}
Causes
- To enhance user experience by preventing accidental exits of the application.
- To provide a more deliberate action for users before fully exiting the app.
Solutions
- Override the onBackPressed() method in your activity class.
- Use a boolean flag to track the first back button press.
- Display a Toast message prompting the user to press again to exit.
Common Mistakes
Mistake: Not resetting the flag for the double back press after 2 seconds.
Solution: Ensure to use a Handler to reset the boolean flag after a short delay.
Mistake: Using incorrect UI feedback, which may confuse the user.
Solution: Ensure the Toast message is clear and prompts the user effectively.
Helpers
- Android back button functionality
- Double back press exit Android app
- Android activity exit control