Develop Reference

Android hardware back button action never fires (Ionic)

I tried adding function to override current back button behaviour, which is exactly the same as pressing back button (left arrow) in browser. This often goes to the view that is forward instead of going back. I understand that this is how WebView would handle back button action if it is not override.
I was surprised that Android back button doesn't work the same as ion-nav-view standard back button, so I found the code that is responsible in ionic.bundle.js:
// Triggered when devices with a hardware back button (Android) is clicked by the user
// This is a Cordova/Phonegap platform specifc method
function onHardwareBackButton(e) {
console.log('check'); //this never fires
var backView = $ionicHistory.backView();
if (backView) {
// there is a back view, go to it
backView.go();
} else {
// there is no back view, so close the app instead
ionic.Platform.exitApp();
}
e.preventDefault();
return false;
}
console.log('check2'); //this fires
$ionicPlatform.registerBackButtonAction(
onHardwareBackButton,
IONIC_BACK_PRIORITY.view
);
I tested it on Galaxy S5.
Any hints how to make this work?

Why are you not using : $ionicHistory.goBack() instead of backView.go(); ?
From doc goBack is the way to navigate through history

I think you are adding the the back view as a new view upon the stack by calling
backView.go();
you should, instead call
$ionicHistory.goBack();

Is it possible you're using Ionic View to run the app? If so, that's been one of the many different-than-native issues that I've run into while using Ionic View. I couldn't get the back button behavior to work as intended within Ionic View, among other things.
I've since switched to testing my app with others using Google Play Alpha/Beta Testing. That will get the app running on every tester's device the way it will actually appear.

Even though I had no errors like:
cordova is undefined
I added the following to my index.html and it started working
<script src="cordova.js"></script>

Handling the back button in a meteor android app

I have built a Meteor app with a mobile app interface (using Ratchet), only designed to be run as an app. On each page, there is a "back" link that takes you back to the parent page. For example, if I go deep inside a hierarchy of page such as this one:
Home > Category > Post
I can use a link in the Post page that will take me back to the Category page. Now, the problem is, if from this Category page I hit the back button, it should have the same behaviour as clicking the back link on the page. (in this case, take me to the Home page) Sadly, this doesn't happen and I get taken back to the Post page.
On iPhone it is not a problem (as far as I know) since there is no actual back button built-in to the device. But on Android it gives me headaches, for example:
Say a user goes to a Post page that he can delete using a button shown on the page. When the post-deletion method finishes, I take the user back to the Category page:
Router.go('categoryPage', {'_id': categoryId});
Problem is: if the user hits the back button after deleting a post, he or she gets taken to a "not found" page, since the previous post has been deleted. Now I can avoid that by adding replaceState: true like this:
Router.go('categoryPage', {'_id': categoryId}, {replaceState: true});
But now when the user hits the back button from the Category page, he or she gets taken to the page that was there before the Post page, which was... the same Category page. So the button just does nothing on the first press.
I also tried to pushState the url of the desired page in each of my template's `rendered̀ function, to no avail (and what would I put in there for the Home page?):
Template.categoryPage.rendered = function () {
history.pushState(null, null, Router.url('home'));
};
Template.postPage.rendered = function () {
history.pushState(null, null, Router.url('categoryPage', {'_id': this.data.categoryId}));
};
Has anyone tackled this issue and/or would be able to drop some knowledge?

As soon as the back button is pressed, Cordova trigger a "backbutton" event, see there.
By listening to this event you should be able to override the default behavior and do what you want:
document.addEventListener("backbutton", onBackButtonDown, false);
function onBackButtonDown(event) {
event.preventDefault();
event.stopPropagation();
// Do what you want
...
}

Cordova Android: handling back button

document.addEventListener ('backbutton', function (evt) {
if (x) return // Proceed normally.
// Do stuff.
})
Adding the back button event listener overrides all the default behavior. (HTML5 History pop listener)
But, that's not what I want. I want the back button to potentially not fire (i.e.: something like evt.preventDefault), allowing the HTML5 History pop event to run. HELP!

it will override the default one. as in the documentation there is no need to prevent the default behavior.
But since in Cordova, "Default behavior" Is just exiting the app you can make it do the same by:
if (x) navigator.app.exitApp();

Close the application on back button of android phones

I'm developing a app using angularjs and ionic framework. It has a logout option also. When i logout from my app it goes straight to the home page.But if i press the back button it'll go to page that can be accessed only if you are logged in. How can i create a option to close the app if you press the back button from the home page? I use angularjs.
I used this way but did not work
document.addEventListener("backbutton", function(e){
if($.mobile.activePage.is('/templates/playlists')){
/*
Event preventDefault/stopPropagation not required as adding backbutton
listener itself override the default behaviour. Refer below PhoneGap link.
*/
//e.preventDefault();
navigator.app.exitApp();
}
else {
navigator.app.backHistory()
}
}, false);

Your code is good.
But, I'm not sure about the second line : are you sure that the active page id is /templates/playlists ?
Normally, the value you should pass to the $.mobile.activePage.is function should contain a page id (which could be retrieved like this : $.mobile.activePage.attr('id')).
(by the way, I don't know which of jQuery Mobile you are using, but the $.mobile.activePage.is was deprecated).

PhoneGap/Cordova blank screen on pause/resume

I have a simple html/javascript app that starts and works up fine on an Android device. However, when the app is put in background by using the 'home button' and then brought back to the foreground by clicking on the app again - it starts with a blank screen (white blank screen on android ) and stays that way until the 'back button' is pressed.
Once the 'back button' is pressed the screen refreshes to the last page displayed by the app.
I am new to PhoneGap and I am sure there is something simple/fundamental that I am missing - in terms of how to handle the 'resume' event/etc.. I have followed the instructions provided on this link by Phil Mitchell http://wiki.phonegap.com/w/page/35501397/Tutorials (which is a great resource btw..)
Thanks.
Update :
After looking at the DroidGap code, I have tried to add the following line :-
super.setBooleanProperty("keepRunning", false);
But this does not seem to help. I am happy for the app to exit every time the home button is entered and then do a full restart when the app is clicked on the mobile.
Any help is much appreciated..

I was having the same problem and I want to share a hack that worked for me.
My app is based on ionic/angular/cordova and the android version was giving me a white screen around 50% the times on pause/resume.
When it happened, tapping anywhere on the screen or hitting the back button would make the screen to render again just fine.
I added a div tied to a scope variable named random, like this:
<body ng-app="starter" id="body">
<div>{{ random }}</div>
<ion-nav-view>
</ion-nav-view>
</body>
Then I added a listener inside my app.js to capture the resume event fired by cordova, to then change the random variable and call $apply(), like this:
document.addEventListener("resume", function() {
angular.element(document.querySelector('#body')).scope().random = Math.random();
angular.element(document.querySelector('#body')).scope().$apply();
})
Since the ion-nav-view takes over the whole screen that div never shows up, but angular doesn't know that and refreshes the page, causing the whole thing to work.
(I tried to tie the variable to an invisible element but then angular doesn't refresh the page)
I hope this helps someone!

There seem to be issues around rendering the pages thru PhoneGap and 'Dialog'ing thru Client side FB authentication flow using the JS SDK. If I disable the client side authentication, then the rendering and display of the page works very well, when the app is brought to foreground from background (pause/resume/etc).
I am assuming that the page will need to sense that it is being displayed over a mobile device and use the IOS or Androi SDK for client side authentication.. (if/when I get around to testing that, I update the answer - if there is anybody who has any more light to shed, please feel free to embellish).

If you still say "I am happy for the app to exit every time the home button is entered and then do a full restart when the app is clicked on the mobile." then go for it.
#Override
protected void onStop(){
super.onStop();
}
Try this from where you create activity or from the class which "extends DroidGap".