android tutorial - Double back in Android Activity | Developer android - android app development - android studio - android app developement
Double back to close application
- You may have noticed that many applications have double-back-click functionality to exit the app. In this example, we are overriding the default back button action using the onBackPressed() method override.
- This method will Toast a message for the single back-click action, and will close the app if the user clicks the back button twice within two seconds. We use a Handler for the functionality that relies on the two-second interval.
boolean singleBack = false;
@Override
public void onBackPressed() {
if (singleBack) {
super.onBackPressed();
return;
}
this.singleBack = true;
Toast.makeText(this, "Double Back to exit", Toast.LENGTH_SHORT).show();
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
singleBack=false;
}
}, 2000);
}