webview-gestures.html

<script src="https://hammerjs.github.io/dist/hammer.min.js"></script>
<script type="text/javascript">
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        var hammertime = new Hammer(document.getElementById("text"));
        hammertime.get('swipe').set({ direction: Hammer.DIRECTION_HORIZONTAL });
        hammertime.on('swipeleft', function (ev) {
            window.external.notify('left');
        });
        hammertime.on('swiperight', function (ev) {
            window.external.notify('right');
        });
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</script>