IncompleteAsyncJob.java

import com.google.api.core.SettableApiFuture;
import com.google.firebase.tasks.TaskCompletionSource;

@Deprecated
public Task<String> incompleteTask() {
  final TaskCompletionSource<String> source = new TaskCompletionSource<>();
  new Thread() {
    @Override
    public void run() {
      try {
        source.setResult(expensiveComputation());
      } catch (Exception e) {
        source.setException(e);
      }
    }
  }.start();
  return source.getTask();
}

public ApiFuture<String> incompleteFuture() {
  final SettableApiFuture<String> future = SettableApiFuture.create();
  new Thread() {
    @Override
    public void run() {
      try {
        future.set(expensiveComputation());
      } catch (Exception e) {
        future.setException(e);
      }
    }
  }.start();
  return future;
}