@Override
public void onLoadChildren(
@NonNull final String parentMediaId, @NonNull final Result<List<MediaItem>> result) {
if (!mMusicProvider.isInitialized()) {
// Use result.detach to allow calling result.sendResult from another thread:
result.detach();
mMusicProvider.retrieveMediaAsync(
new MusicProvider.Callback() {
@Override
public void onMusicCatalogReady(boolean success) {
if (success) {
loadChildrenImpl(parentMediaId, result);
} else {
updatePlaybackState(getString(R.string.error_no_metadata));
result.sendResult(Collections.<MediaItem>emptyList());
}
}
});
} else {
// If our music catalog is already loaded/cached, load them into result immediately
loadChildrenImpl(parentMediaId, result);
}
}
