CODEWITHSUNDEEP
androidandroid-alertdialogandroid-lifecycle
KingAhmad
KingAhmad

Reputation: 11

Android - How to alert user, if wants his entered data to be saved, on back key?

In user enter data, UI/UX screen there are 'Save', 'Cancel' buttons. If user enters some data, BUT taps Back key, I need to display (AlertDialog) whether he wants to save the data or not. How can be done ?

I think this should be done on something like: @override onDestroy() ? but unable to (kind of) hold/pause onDestroy() and display the AlertDialog !

This would be something similar to what 'Microsoft Word' does, but in Android.

Upvotes: 1

Views: 80

Answers (3)

Mustafo aka Shokhrukh Makmudov
Mustafo aka Shokhrukh Makmudov

Reputation: 582

If you have Fragment you can Pass Listener and then you can listen whenever user presses back button you will be notified.

create interface.

interface IOnBackPressed {
    fun onBackPressed(): Boolean
}

in your Activity.

class MyActivity : AppCompatActivity() {
    
     override fun onBackPressed() {
        val fragment =
            this.supportFragmentManager.findFragmentById(R.id.main_container)
        (fragment as? IOnBackPressed)?.onBackPressed()?.not()?.let {
            super.onBackPressed()
        }
    }

}

in your Fragment.

class YourFragmentName : Fragment(), IOnBackPressed {

    override fun onBackPressed(): Boolean {
            //Create Your Dialog.
           //Dialog.Positive.clicked return true
          //Dialog.Negate.clicked return false
    }
}

Upvotes: 0

aditya agarwal
aditya agarwal

Reputation: 27

There is a method specifically for this purpose, it's called when the user presses the back button on their device.

 @Override
public void onBackPressed() {
    //super.onBackPressed();
   ..call the dialog builder here..
}

you can use super.onBackPressed() method when the user presses either the positive or negative buttons.

Upvotes: 0

Eliezer
Eliezer

Reputation: 7347

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        if(needsSave){
            .
            .
            .
            return true;
        }
    }
    return super.onKeyDown(keyCode, event);
}

Upvotes: 1

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