cant catch androidback event

Question

When I press the back button on my android device it closes the activity I'm currently on. I need to prevent this to happen. I found this question here, also I found this documentation for that event and the naming is different, then I found a third name for the same event here. I tried with all of them, even at the same time like this:

$.currentWindow.addEventListener("android:back",back);
$.currentWindow.addEventListener("androidback",back);
$.currentWindow.addEventListener("windows:back",back);
$.currentWindow.addEventListener("windowsback",back);

none of them worked, also I noticed I have to use Titanium.UI.currentWindow.addEventListener("evt", callback) but Titanium.UI.currentWindow seems to be Undefined. I open my window like this:

var nextWindow = core.createWindow({
    controllerName : "restaurantActivity"
});
nextWindow.open();

Here is my callback function

function back(e) {
    e.cancelBubble = true;
    console.log(e.type);
    if (Ti.App.pplatillo.length != 0) {
        console.log("Confirm before exit.");
        var dialog = Ti.UI.createAlertDialog({
            cancel : 1,
            buttonNames : ["Sí", "No"],
            message : "Tienes artículos en tu carrito y el pedido no se ha concretado, si sales perderás los artículos. ¿Seguro que desea salir?",
            title : "Salir"
        });
        dialog.addEventListener("click", function(e) {
            if (e.index != e.source.cancel) {
                Ti.App.pplatillo = [];
                Ti.App.car = 0;
                Ti.App.totalBill = 0;
                $.window.close();
            }
        });
        dialog.show();
    } else {
        console.log("Just exit :(");
        $.window.close();
    }
}

Any help will be appreciated.

score 0 · Answer 1 · answered Aug 11 '17 at 07:23

0

If you want to stop your current activity should not close on pressing the android back button. So you have to just remove/comment "$.window.close()" line from your above "back" function.

Thanks,

answered Aug 11 '17 at 07:23

Hemant Solanki

64
10

That's not the problem, my back function should close the window, but first it has to ask the user if he wants to close. The problem is that the function back never occurs because it is never called by the event, and that is because the event itself is never caught. – Guy who types fast Aug 11 '17 at 14:38

score 0 · Answer 2 · answered Aug 15 '17 at 14:40

0

You can try the following approach:

$.MyControllerName.addEventListener("android:back", backCallbackFunctionHandler);

In this case whenever you press the back button, the backCallbackFunctionHandler function will be getting called. Inside that you can show an alert dialog and handle the yes/no button click to perform the required action to close or not to close the window.

answered Aug 15 '17 at 14:40

Soumya

1,350
3
19
34

Thanks for your answer, but it didn't work. I get `$.MyControllerName` as undefined (obviously I'm using the controller actual name). – Guy who types fast Aug 16 '17 at 15:31

score 0 · Answer 3 · answered Aug 16 '17 at 15:34

For future references, I managed solved the problem.

What I did, was add the event listener to the view in the view where I open it before opening it:

var nextWindow = core.createWindow({
    controllerName : "restaurantActivity"
});

nextWindow.addEventListener("android:back",back);

nextWindow.open();

I also had to put the callback function back in the same file.

score -1 · Answer 4 · answered Aug 10 '17 at 23:47

-1

How about handling it inside the app? Using this

 @Override
public void onBackPressed() {
    super.onBackPressed();  
}

answered Aug 10 '17 at 23:47

Sakura Fukuyoshi

1,461
1
10
14

I forgot to mention something very Important. I'm using javascript. That isn't javascript right?? (I'm not new but I've never seen that.) – Guy who types fast Aug 10 '17 at 23:55
Oh, my code is you can put it in your MainActivity. I have a question, so you do have an app and you're using webview? – Sakura Fukuyoshi Aug 11 '17 at 00:00
@SakuraFukuyoshi the technology is Titanium ;) – Rene Pot Aug 11 '17 at 09:06

cant catch androidback event

4 Answers4