Why ionic spinner and ion ios-play are not working in android 4.1 versions

i am trying to open > my ionic app in my tablet that is 4.2 version in that ionic spinner,and the ionic audio controls like

 <ion-audio-controls>
                                                           
                                <button class="button button-light button-clear icon-left ion-ios-rewind-outline padding-horizontal" ng-click="moveBackward(range.sliderPercentage)" style="border-radius:50%;padding-left:19px;height:60px;width:60px;"></button>
                              
                                <button class="button button-light button-clear icon-left {{podxplay}} padding-horizontal" ng-click="song.togglePlay()" style="border-radius:50%;padding-left:20px;height:40px;width:40px;border: 2px solid #fff;"></button>
                               
                            </ion-audio-controls>

waiting for ur reply friends