ActivityIndicator Style (Androidのみ)
| DontShow | ActivityIndicator を非表示にします。 |
| Large | Large (android.R.attr.progressBarStyleLarge). |
| InversedLarge | Large Inversed (android.R.attr.progressBarStyleLargeInverse). |
| Small | Small (android.R.attr.progressBarStyleSmall). |
| InversedSmall | Small Inversed (android.R.attr.progressBarStyleSmallInverse). |