How I can get any action for back-button when the alert dialog is shown? I have to ask user "Do you really want discard changes?"

At this time there is alert dialog for input on the screen.

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2 Answers

Your initial question was not very clear on what you wanted to do. So if you want to show a dialog when a user presses the back button after having types something in the EditText- then you need to @Override the onBackPressed method in your Activity class.

@Override
public void onBackPressed() { // Here you want to show the user a dialog box new AlertDialog.Builder(context) .setTitle("Exiting the App") .setMessage("Are you sure?") .setPositiveButton("YES", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { // The user wants to leave - so dismiss the dialog and exit finish(); dialog.dismiss(); } }).setNegativeButton("NO", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { // The user is not sure, so you can exit or just stay dialog.dismiss(); } }).show();
}

You can look at the accepted answer here.

But if you only wanted to handle the back-button press on the Dialog itself, then there's already an answer for this question - basically you set an OnKeyListener on the dialog like this:

dialog.setOnKeyListener(new Dialog.OnKeyListener() { @Override public boolean onKey(DialogInterface arg0, int keyCode,KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_BACK) { /* The user pressed back button - do whatever here. Normally you dismiss the dialog like dialog.dismiss(); */ } return true; } });

Look at the accepted answer here.

10

builder.setNegativeButton(R.string.btn_rev, new DialogInterface.OnClickListener(){ @Override public void onClick(DialogInterface dialog, int which) { //если что-то ввели и нажали Назад if (edText.getText() != null) { // onBackPressed(); //here's code for back-button } } });

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