Use the numberOfLines parameter on a Text component:
<Text numberOfLines={1}>long long long long text<Text>
Will produce:
long long long…
(Assuming you have short width container.)
Use the ellipsizeMode parameter to move the ellipsis to the head or middle. tail is the default value.
<Text numberOfLines={1} ellipsizeMode="head">long long long long text<Text>
Will produce:
…long long text
NOTE: The Text component should also include style={{ flex: 1 }} when the ellipsis needs to be applied relative to the size of its container. Useful for row layouts, etc.