An alternative that javax.annotation.Nullable can't find in Android engineering

Http://androidren.com/index.php?qa=315&qa_1=android%E5%B7%A5%E7%A8%8B%E4%B8%ADjavax-annotation-nullable%E6 %89%be%e4%b8%8d%e5%88%b0%e7%9a%84%e6%9b%bf%e4%bb%a3%e6%96%b9%e6%a1%88

We may encounter the following references in some Android open source libraries: import Javax.annotation.nonnull;import javax.annotation.Nullable; In fact, the Android implementation of javax similar annotations, you can use the following reference to replace: import Android.support.annotation.nonnull;import android.support.annotation.Nullable; Of course, the latter need to be cited in the declaration of the Library: dependencies {compile ' com.android.support:support-annotations:21.0.2 '}

An alternative that javax.annotation.Nullable can't find in Android engineering