AndroidWarning: Notannotatedparameteroverrides@NonNullparameter

Warning: Not annotated parameter overrides @NonNull parameter

Address of this article: http://blog.csdn.net/caroline_wendy

Warning: The @NonNull annotation can be used to indicate that a given parameter can not be null.
“ The meaning of @NonNull” is that the comment is not empty. If the above warning appears, it indicates that the parameter should have a non-null label; If you add:

public void onReceive(@NonNull Context context, @NonNull Intent intent);

Specific: It’s an annotation, but the correct name is NonNull:
protected void onSaveInstanceState(@NonNull Bundle outState)(And also)import android.support.annotation.NoNNull;
The purpose is to allow the compiler to warn when certain assumptions are being violated (such as a parameter of a method that should always have a value, as in this particular case, although there are others). From the Support Annotations documentation:
The @NonNull annotation can be used to indicate that a given parameter can not be null.
If a local variable is known to be null (for example because some earlier code checked whether it was null), and you pass that as a parameter to a method where that parameter is marked as @NonNull, the IDE will warn you that you have a potential crash.
They are tools for static analysis. Runtime behavior is not altered at all.
Reference: http://stackoverflow.com/questions/24728627/meaning-of-android-studio-error-not-annotated-parameter-overrides-notnull-para

Android – Warning: Not annotated parameter overrides @NonNull parameter