android - Animation effect to buttons in linear layout -


i have floating action button , linear layout containing 5 buttons.on clicking of floating action button, making linear layout visible or invisible.i want add animations buttons on click of floating action button.the animation should on clicking of fab,first button should visible of linear layout , second button should visible,then third,then fourth , on.i have tried adding following animation doesn't quite work me

<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android">     <alpha xmlns:android="http://schemas.android.com/apk/res/android"         android:fromalpha="1.0"         android:toalpha="0.4"         android:duration="1000"         android:repeatcount="infinite"         android:repeatmode="reverse"         />  </set>

please help


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