app.js

var win = Titanium.UI.createWindow({
    title : 'Audio Test',
    backgroundColor : '#fff',
    //layout : 'vertical'
});

var url = encodeURIComponent("https://itunes.apple.com/us/app/smartuaq/id1063110068?ls=1&mt=8").replace(/'/g,"%27").replace(/"/g,"%22");


var whatsappUrl = 'whatsapp://send?text=' + url;

var clickme = Ti.UI.createButton({
    title : 'Click Me',

});

// Listen for click events.
clickme.addEventListener('click', function() {
    if (Ti.Platform.osname !== 'android') {

        if (Ti.Platform.canOpenURL(whatsappUrl)) {

            Ti.Platform.openURL(whatsappUrl);

        } else {

            Ti.Platform.openURL("https://itunes.apple.com/ae/app/whatsapp-messenger/id310633997?mt=8");

        }

    } else {

        var isSuccess = Ti.Platform.openURL(whatsappUrl);

        if (!isSuccess) {

            Ti.Platform.openURL("https://play.google.com/store/apps/details?id=com.whatsapp&hl=en");

        }

    }
});

// Add to the parent view.
win.add(clickme);

win.open();

tiapp.xml

    <ios>
        <plist>
            <dict>
                <key>UISupportedInterfaceOrientations~iphone</key>
                <array>
                    <string>UIInterfaceOrientationPortrait</string>
                </array>
                <key>UISupportedInterfaceOrientations~ipad</key>
                <array>
                    <string>UIInterfaceOrientationPortrait</string>
                    <string>UIInterfaceOrientationPortraitUpsideDown</string>
                </array>
                <key>UIRequiresPersistentWiFi</key>
                <false/>
                <key>UIPrerenderedIcon</key>
                <false/>
                <key>UIStatusBarHidden</key>
                <false/>
                <key>UIStatusBarStyle</key>
                <string>UIStatusBarStyleDefault</string>
                <key>LSApplicationQueriesSchemes</key>
                <array>
                    <string>twitter</string>
                    <string>whatsapp</string>
                </array>
            </dict>
        </plist>
    </ios>