Android – Prevent back button from closing a dialog box

androidback

I am trying to prevent an AlertDialog box from closing when pressing the back button in Android. I have followed both of the popular methods in this thread, and with System.out.println I can see that in both cases the code executes. However, the back button still closes the dialog box.

What could I be doing wrong? Ultimately I'm trying to prevent the back button closing a dialog box – it is a disclaimer that is displayed the first time the app is run and I don't want the user to have any option but to press the "Accept" button in order for the app to continue.

Best Answer

Simply use the setCancelable() feature:

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setCancelable(false);

This prevents the back button from closing the dialog, but leaves the "negative" button intact if you chose to use it.

While any user that does not want to accept your terms of service can push the home button, in light of Squonk's comment, here two more ways to prevent them from "backing out" of the user agreement. One is a simple "Refuse" button and the other overrides the back button in the dialog:

builder.setNegativeButton("Refuse", new OnClickListener() {
           @Override
           public void onClick(DialogInterface dialog, int which) {
               finish();
           }
       })
       .setOnKeyListener(new OnKeyListener() {
           @Override
           public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
               if(keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_UP)
                   finish();
               return false;
           }
       });

Related Solutions

Android – Prevent ProgressDialog from being dismissed when I click the search button (Android)

This works (notice I put it on the dialog builder):

.setOnKeyListener(new DialogInterface.OnKeyListener() {

    @Override
    public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_SEARCH && event.getRepeatCount() == 0) {
            return true; // Pretend we processed it
        }
        return false; // Any other keys are still processed as normal
    }
})

Maybe it's even possible to grab the positive and negative button presses, and only handle these, return true for any other keys. Would be curious if you can figure that out...

PS: I read somewhere there are more "holes" in the dialog, i.e you can get rid of it without hitting any buttons on it. This was apparently one. Does anybody know of any others?

Android – How to prevent a dialog from closing when a button is clicked

EDIT: This only works on API 8+ as noted by some of the comments.

This is a late answer, but you can add an onShowListener to the AlertDialog where you can then override the onClickListener of the button.

final AlertDialog dialog = new AlertDialog.Builder(context)
        .setView(v)
        .setTitle(R.string.my_title)
        .setPositiveButton(android.R.string.ok, null) //Set to null. We override the onclick
        .setNegativeButton(android.R.string.cancel, null)
        .create();

dialog.setOnShowListener(new DialogInterface.OnShowListener() {

    @Override
    public void onShow(DialogInterface dialogInterface) {

        Button button = ((AlertDialog) dialog).getButton(AlertDialog.BUTTON_POSITIVE);
        button.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {
                // TODO Do something

                //Dismiss once everything is OK.
                dialog.dismiss();
            }
        });
    }
});
dialog.show();

Best Answer

Related Solutions

Android – Prevent ProgressDialog from being dismissed when I click the search button (Android)

Android – How to prevent a dialog from closing when a button is clicked

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