How to show item from json Array one by one in Angular JS

I am developing one prototype application in ionic framework. I am newbie for angular js, HTML, CSS , Java Script and all this stuff.

I have one json file which I am using as a input. I am able to parse this Json file and able to get json object from this. This json object contains array of items. You can refer below json content for this. Here items are application A,B.....

Updated Input Json :

{
    "data": [
        {
            "applicationname": "A",
            "permissions": [
                {
                    "text": "at"
                },
                {
                    "text": "at1"
                }
            ]
        },
        {
            "applicationname": "B",
            "permissions": [
                {
                    "text": "bt"
                },
                {
                    "text": "bt1"
                }
            ]
        }
    ]
}

First time when application start at that time application should load only first item data from above json array that means only application "A" (first item) data.

Once user click on any buttons (install/cancel) from Footer then it should changed its data and display application "B"'s contents. This process should continue till end json array.

My current code is not loading even first item data in. I am doing something wrong in HTML.

Updated Code :

HTML file :

<ion-header-bar class="bar-calm">
    <h1 class="title">Application Permissions</h1>
</ion-header-bar>
<ion-nav-view name="home" ng-repeat="app in applicationdata">
    <div class="bar bar-subheader bar-positive">
        <h3 class="title"> {{app.applicationname }}</h3>
    </div>
    <ion-content class="has-subheader">
        <div class="list" ng-controller="CheckboxController">
            <ion-checkbox ng-repeat="item in app.permissions" ng-model="item.checked" ng-checked="selection.indexOf(item) > -1" ng-click="toggleSelection(item)">
                {{ item.text }}
                <h3 class="item-text-wrap"> details come soon </h3>
            </ion-checkbox>
            <div class="item">
                <pre ng-bind="selection | json"></pre>
            </div>
            <div class="item">
                <pre ng-bind="selection1 | json"></pre>
            </div>
        </div>
    </ion-content>
    <ion-footer-bar align-title="left" class="bar-light" ng-controller="FooterController">
        <div class="buttons">
            <button class="button button-balanced" ng-click="infunc()"> Install </button>
        </div>
        <h1 class="title"> </h1>
        <div class="buttons" ng-click="doSomething()">
            <button class="button button-balanced"> Cancel </button>
        </div>
    </ion-footer-bar>
</ion-nav-view>

app.js file :

pmApp.controller('CheckboxController', function ($scope, $http, DataService) {


    // define the function that does the ajax call
    getmydata = function () {
        return $http.get("js/sample.json")
            .success(function (data) {
                $scope.applicationdata = data;
            });

    }

    // do the ajax call
    getmydata().success(function (data) {
        // stuff is now in our scope, I can alert it
        $scope.data = $scope.applicationdata.data;
        $scope.devList = $scope.data[0].permissions;
        console.log("data : " + JSON.stringify($scope.data));
        console.log("first application data : " + JSON.stringify($scope.devList));
    });

    $scope.selection = [];
    $scope.selection1 = [];
    // toggle selection for a given employee by name
    $scope.toggleSelection = function toggleSelection(item) {
        var idx = $scope.selection.indexOf(item);
        var jsonO = angular.copy(item);
        jsonO.timestamp = Date.now();

        DataService.addTrackedData(jsonO);
        $scope.selection1 = DataService.getTrackedData();

        // is currently selected
        if (idx > -1) {
            $scope.selection.splice(idx, 1);

        }
        // is newly selected
        else {
            DataService.addSelectedData(item);
            $scope.selection = DataService.getSelectedData();
            /* $scope.selection.push(item);*/
        }
    };

});

Problems :

1 : Why first item data is not load, I have done changes in HTML as per my understanding, Its not working.

2 : How Can I navigate through all items. I will try @John Carpenter's answer. Before that first problem should be resolved.

Please help me, thanks in advance.