Task.call(new Callable<Boolean>() {
@Override
public Boolean call() throws Exception {
return true;
}
}, Task.UI_THREAD_EXECUTOR);

Task.callInBackground(new Callable<Boolean>() {
@Override
public Boolean call() throws Exception {
return false;
}
});

Task.callInBackground(new Callable<Boolean>() {
@Override
public Boolean call() throws Exception {
return true;
}
}).onSuccess(new Continuation<Boolean, Object>() {
@Override
public Object then(Task<Boolean> task) throws Exception {
if (task.getResult()) {
return null;
} else {
return new Object();
}
}
}, Task.BACKGROUND_EXECUTOR).continueWith(new Continuation<Object, Object>() {
@Override
public Object then(Task<Object> task) throws Exception {
if (task.getResult() == null) {
Toast.makeText(getBaseContext(), "null", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getBaseContext(), "not null", Toast.LENGTH_SHORT).show();
}

return null;
}
}, Task.UI_THREAD_EXECUTOR);

/**
* An {@link java.util.concurrent.Executor} that runs tasks on the UI thread.
*/
private static class UIThreadExecutor implements Executor {
@Override
public void execute(Runnable command) {
new Handler(Looper.getMainLooper()).post(command);
}
}

private BoltsExecutors() {
background = !isAndroidRuntime()
? java.util.concurrent.Executors.newCachedThreadPool()
: AndroidExecutors.newCachedThreadPool();
scheduled = Executors.newSingleThreadScheduledExecutor();
immediate = new ImmediateExecutor();
}