termux-app/app/src/main/res/anim/on_bell.xml

<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate android:duration="30"
               android:fromXDelta="-1%"
               android:repeatCount="1"
               android:repeatMode="reverse"
               android:toXDelta="1%"/>
</set>