isPlayable method
Check if player is playable
Only the four state FijkState.prepared \ FijkState.started
FijkState.paused \ FijkState.completed are playable
Implementation
bool isPlayable() {
FijkState current = value.state;
return FijkState.prepared == current ||
FijkState.started == current ||
FijkState.paused == current ||
FijkState.completed == current;
}