ListItem Avatar Not Displaying

You're using the wrong object for the image avatar.

Stable Version

Either

avatar={{ uri: item.icon }}

OR

avatar={<Avatar
           rounded
           source={{uri: item.icon}}
           title={'Sample Title'}
       />}

Beta Version

leftAvatar={{ source: { uri: item.icon } }}

According to react-native-elements they have leftAvatar and no just avatar

<ListItem
        key={i}
        leftAvatar={{ source: { uri: l.avatar_url } }}
        title={l.name}
        subtitle={l.subtitle}
      />