Not working onbackpressed when setcancelable of alertdialog is false

Question

I have an AlertDialog and its setCancelable() is false. In Onbackpressed function I want the AlertDialog to be closed. But when setCancelable() is false, the back key doesn't work at all. What should I do to get rid of this problem? I don't want to change setCancelable() to true because I will have another problem.

import android.os.Bundle
import android.widget.Toast
import androidx.appcompat.app.AlertDialog
import androidx.appcompat.app.AppCompatActivity

class MainActivity : AppCompatActivity() {
    lateinit var dialogBuilder: AlertDialog.Builder
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        dialogBuilder = AlertDialog.Builder(this)
        dialogBuilder.setMessage("Check your internet connection")
            .setPositiveButton("OK") { _, _ ->
                Toast.makeText(this, "OK", Toast.LENGTH_LONG).show()
            }.setCancelable(false)
            .create().show()
    }
}

Does this https://stackoverflow.com/a/25251122/5343866 answer your question? — Abhinav Suman, Mar 15 '20 at 08:29
Hey @MohammadMoeinGolchin, you need to stop talking about upvoting and downvoting. This habit is heavily frowned upon on StackOverflow. Allow users to vote at their own discretion; you don't need to talk about votes at all. — Taslim Oseni, Mar 15 '20 at 09:39

score 7 · Accepted Answer · answered Mar 15 '20 at 10:10

7

just add a onKeyListener and cancel dialog on back key event.

    lateinit var dialog: AlertDialog

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        dialog = AlertDialog.Builder(this).setMessage("Check your internet connection")
                .setPositiveButton("OK") { _, _ ->
                    Toast.makeText(this, "OK", Toast.LENGTH_LONG).show()
                }.setCancelable(false)
                .create()
        dialog.show()

        dialog.setOnKeyListener { _, keyCode, _ ->
            if(keyCode == KeyEvent.KEYCODE_BACK) {
                if(dialog.isShowing) {
                    dialog.dismiss()
                }
            }
            true
        }
    }

answered Mar 15 '20 at 10:10

Alif Hasnain

1,176
1
11
24

Is this code for both alert-dialog and custom-dialog? – MMG Mar 15 '20 at 10:50
this is for alert dialog – Alif Hasnain Mar 15 '20 at 11:10
I think you said vice versa. It has problem for alert dialog. – MMG Mar 15 '20 at 11:12
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/209659/discussion-between-alif-hasnain-and-mohammadmoeingolchin). – Alif Hasnain Mar 15 '20 at 11:23
happy to be useful :) – Alif Hasnain Mar 22 '20 at 11:00

Taslim Oseni · Answer 2 · 2020-03-16T12:07:08.383

5

The easiest work-around for this problem is to set an OnKeyListener and automatically detect when the user hits the back button.

Java:

public Dialog onCreateDialog(Bundle savedInstanceState) {

  Dialog dialog = super.onCreateDialog(savedInstanceState);

  dialog.setOnKeyListener(new Dialog.OnKeyListener() {
    @Override
    public boolean onKey(DialogInterface dialogInterface, int keyCode, KeyEvent keyEvent) {
        if (keyCode == KeyEvent.KEYCODE_BACK && keyEvent.getAction() == KeyEvent.ACTION_UP) {
          dialog.cancel;
          return true;
        }
        return false;
    }
  });

  return dialog;
}

Kotlin:

    dialog = AlertDialog.Builder(this)
            .setCancelable(false)
            .create()
    dialog.show()

    dialog.setOnKeyListener (object : Dialog.OnKeyListener { 
      override fun onKey(dialogInterface: DialogInterface, keyCode: Int, keyEvent: KeyEvent) {
        if(keyCode == KeyEvent.KEYCODE_BACK and keyEvent.action == KeyEvent.ACTION_UP) {
            dialog.dismiss()
            true
        }
        false
      }})

Note that I added an extra condition in the if-statement, all this does is to make sure this does not fire twice.

I hope this helps you.

edited Mar 16 '20 at 12:07

answered Mar 15 '20 at 09:45

Taslim Oseni

6,086
10
44
69

Is my code in Java that you answered me in Java?!@Taslim Oseni – MMG Mar 15 '20 at 09:55
I have added a Kotlin solution. ;-) – Taslim Oseni Mar 15 '20 at 10:50
1

What kind of error you getting in -Taslim Oseni answer @MohammadMoeinGolchin – Ali Mar 16 '20 at 07:59
Copy and paste his code in Android Studio. You will see the error@Ali – MMG Mar 16 '20 at 09:10
Are you sure? Has it any change?@TaslimOseni – MMG Mar 16 '20 at 10:28
Yes it has, friend. – Taslim Oseni Mar 18 '20 at 07:37

score 5 · Answer 3 · edited Mar 18 '20 at 06:51

As i see you create dialogBuilder is public why not you call this in a public alertDialog and than show it using alertDilog.show() and close on back pressClick in activity and dismiss the dialog alertDilog.dismiss() override the onBackPress and dismiss it here

val alertDialog:AlertDialog?=null


         alertDialog = new AlertDialog.Builder(this)
        //set icon 
        .setIcon(android.R.drawable.ic_dialog_alert)
        //set title
        .setTitle("Are you sure to Exit")
        //set message
        .setMessage("Exiting will call finish() method")
        //set positive button
        .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {
        //set what would happen when positive button is clicked    
            finish();
        }
        })
        //set negative button
        .setNegativeButton("No", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {
        //set what should happen when negative button is clicked
            Toast.makeText(getApplicationContext(),"Nothing 
          Happened",Toast.LENGTH_LONG).show();
         }
        })
        .show();

       onBackPress(){alertDialog.dismiss()}

Wahdat Jan · Answer 4 · 2020-03-15T09:58:53.053

3

dialogBuilder.setOnKeyListener(object : OnKeyListener() {
            fun onKey(dialog: DialogInterface, keyCode: Int, event: KeyEvent?): Boolean {
                if (keyCode == KeyEvent.KEYCODE_BACK) {
//if you want to cancel the dialog only
                    dialog.cancel()
                    //if you want to finish then 
                   // finish()
                }
                return true
            }
        })

edited Mar 15 '20 at 09:58

answered Mar 15 '20 at 08:15

Wahdat Jan

3,988
3
21
46

Comments are not for extended discussion; this conversation has been [moved to chat](https://chat.stackoverflow.com/rooms/209657/discussion-on-answer-by-wahdat-kashmiri-not-working-onbackpressed-when-setcancel). – Samuel Liew Mar 15 '20 at 11:02

Raza · Answer 5 · 2020-03-17T06:36:16.510

3

if you don't want to close the dialog when touched outside area of the dialog, you can set the property

    permissionDialog.setCanceledOnTouchOutside(false)

and if you want to dismiss the dialog on backpress you need to call the method on keyListener

 permissionDialog?.setOnKeyListener { dialog, keyCode, _ ->
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            dialog?.dismiss()
            true
        }
        false
    }

edited Mar 17 '20 at 06:36

answered Mar 17 '20 at 06:08

Raza

791
7
22

Thanks Raza, my code is in Kotlin, this code may work correctly in Java. – MMG Mar 17 '20 at 06:20
permissionDialog is my alert dialog? – MMG Mar 17 '20 at 06:39
instead of dialog builder , you should use customDialog with layout. – Raza Mar 17 '20 at 07:31
and yes permissionDialog is alertDialog – Raza Mar 17 '20 at 07:32
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/209750/discussion-between-mohammadmoeingolchin-and-raza). – MMG Mar 17 '20 at 07:44

Not working onbackpressed when setcancelable of alertdialog is false

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