Add @Nullable and @NonNull to module API

These two annotations are already in the public/system stubs,
but are re-written to be package private instead of public. This
makes them inaccessible to libs building against these stubs.

When setting sdk_version:<X>, the stubs of X will appear before any
other libraries on the classpath. This also makes it impossible for
modules to add Nullable annotations of their own when setting sdk_version.

Exposing these annotations as public in the module stubs makes it
possible for modules using these annotation to specify an sdk_version.

Bug: 146758669
Test: m
Test: downstream CLs using sdk_version:module_current
Change-Id: I71fb766d02f833ed9a1b3a7dbfbc1c8118882b30
Merged-In: I71fb766d02f833ed9a1b3a7dbfbc1c8118882b30
(cherry picked from commit c8fc90a0c2b04a5f6f5e6006155ca1e9a09db4e3)

2 files changed, 12 insertions, 6 deletions

diff --git a/core/java/android/annotation/NonNull.java b/core/java/android/annotation/NonNull.java
index 927f9975b3eb..a95bf3b8061e 100644
--- a/core/java/android/annotation/NonNull.java
+++ b/core/java/android/annotation/NonNull.java
@@ -15,14 +15,16 @@
  */
 package android.annotation;
 
-import java.lang.annotation.Retention;
-import java.lang.annotation.Target;
-
 import static java.lang.annotation.ElementType.FIELD;
 import static java.lang.annotation.ElementType.METHOD;
 import static java.lang.annotation.ElementType.PARAMETER;
 import static java.lang.annotation.RetentionPolicy.SOURCE;
 
+import android.annotation.SystemApi.Client;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
 /**
  * Denotes that a parameter, field or method return value can never be null.
  * <p>
@@ -34,5 +36,6 @@ import static java.lang.annotation.RetentionPolicy.SOURCE;
  */
 @Retention(SOURCE)
 @Target({METHOD, PARAMETER, FIELD})
+@SystemApi(client = Client.MODULE_LIBRARIES)
 public @interface NonNull {
 }
diff --git a/core/java/android/annotation/Nullable.java b/core/java/android/annotation/Nullable.java
index b60170b134e1..2fcddfab9375 100644
--- a/core/java/android/annotation/Nullable.java
+++ b/core/java/android/annotation/Nullable.java
@@ -15,14 +15,16 @@
  */
 package android.annotation;
 
-import java.lang.annotation.Retention;
-import java.lang.annotation.Target;
-
 import static java.lang.annotation.ElementType.FIELD;
 import static java.lang.annotation.ElementType.METHOD;
 import static java.lang.annotation.ElementType.PARAMETER;
 import static java.lang.annotation.RetentionPolicy.SOURCE;
 
+import android.annotation.SystemApi.Client;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
 /**
  * Denotes that a parameter, field or method return value can be null.
  * <p>
@@ -41,5 +43,6 @@ import static java.lang.annotation.RetentionPolicy.SOURCE;
  */
 @Retention(SOURCE)
 @Target({METHOD, PARAMETER, FIELD})
+@SystemApi(client = Client.MODULE_LIBRARIES)
 public @interface Nullable {
 }