How to handle Back button with in the dialog?

I am developing an application that when the button is pressed, it opens a dialog with OK and Cancel buttons.

It works fine.

When the user presses the back button, I am handling this as follows

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

But the above method is not called. How can I handle this?

dialog.setOnKeyListener(new Dialog.OnKeyListener() {

			@Override
			public boolean onKey(DialogInterface arg0, int keyCode,
					KeyEvent event) {
				// TODO Auto-generated method stub
				if (keyCode == KeyEvent.KEYCODE_BACK) {
					finish();
					dialog.dismiss();
				}
				return true;
			}
		});

Sounds like you want to set the OnCancelListener when you create the Dialog. It looks like this:

dialog.setOnCancelListener(new DialogInterface.OnCancelListener() {			
    @Override
    public void onCancel(DialogInterface dialog) {
        //do whatever you want the back key to do
    }
});

You need to override OnCancel method. This method calls on Back Key press. Here's code which works perfect to me.

 AlertDialog alertDialog;

    alertDialog.setOnCancelListener(new OnCancelListener() 
    {        			
           @Override
        	public void onCancel(DialogInterface dialog) 
             {
        	   // TODO Auto-generated method stub
        
    				dialog.dismiss();        		        	
       
       		}
}); 

Hope this will help you, and accept it if it is helpful to you.

Thanks..

Try this

 new AlertDialog.Builder(this).setOnKeyListener(new DialogInterface.OnKeyListener() {
						
						@Override
						public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
							
							if(keyCode == KeyEvent.KEYCODE_BACK){
								Logger.d(TAG, "--------- Do Something -----------");
								return true;
							}
							return false;
							
							
						}
					})

If you are using a DialogFragment, from what I can tell the right way to do it is to override onCancel()

I noticed setOnCancelListener does not work, and setOnKeyListener works, but for me has the fun side effect that it swallows all keys if your dialog has an edit text.

it is because when your Dialog opens then your window navigate its focused to Dialog. So now you have to handle key on your Dialog.

Override method onBackPressed() in your own dialog and use it in your code:

public class MyDialog extends Dialog {
    
    public MyDialog(@NonNull Context context) {
        super(context);
    }

    @Override
    public void onBackPressed() {
        // Do what you want
    }
}

Use:

MyDialog dlg = new MyDialog(context);
dlg.show();

This code works:

    Dialog dlg = new Dialog(thisAct, R.style.DialogTheme);
    dlg.setContentView(view);
    dlg.setCancelable(false);
    dlg.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
    dlg.setOnKeyListener((arg0, keyCode, event) -> {
        Timber.d("onKey(%d)", keyCode);
        //{home intercepting
        if ((keyCode == KeyEvent.KEYCODE_HOME)) {
            Timber.i("HOME pressed");
            return true;
        }

        return true;
    });
    dlg.show();

For Kotlin:

I tried this and that is working fine for me.

dialog.setOnKeyListener { _, keyCode, _ ->
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            //do to task here
        }
        true
    }