Warning：Not annotated parameter overrides @NonNull parameter
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Warning：The @NonNull annotation can be used to indicate that a given parameter can not be null.
"@NonNull"的含义是注释非空，如果出现以上警告，就表明参数应该有非空标注；
如添加：
public void onReceive(@NonNull Context context, @NonNull Intent intent);
具体：
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.