AsyncValueWrap.java

import com.google.api.core.ApiFutures;
import com.google.firebase.tasks.Tasks;

String value = "value";
Exception error = new Exception("custom error");

// Wrap in Tasks
Task<String> valueTask = Tasks.forResult(value);
Task<String> exceptionTask = Tasks.forException(error);

// Wrap in Futures
ApiFuture<String> valueFuture = ApiFutures.immediateFuture(value);
ApiFuture<String> exceptionFuture = ApiFutures.immediateFailedFuture(error);