Add NonNull and Nullable annotations to AndroidKeyStore API.

This is to enable Android Lint and Android Studio to flag nullness
issues at compile time.

Bug: 18088752
Change-Id: I21033b8fcdd989d08c89b50685e47fbb9c74acbf

1 files changed, 3 insertions, 1 deletions

diff --git a/keystore/java/android/security/KeyChainAliasCallback.java b/keystore/java/android/security/KeyChainAliasCallback.java
index 2500863f4b08..8e413770d188 100644
--- a/keystore/java/android/security/KeyChainAliasCallback.java
+++ b/keystore/java/android/security/KeyChainAliasCallback.java
@@ -15,6 +15,8 @@
  */
 package android.security;
 
+import android.annotation.Nullable;
+
 /**
  * The KeyChainAliasCallback is the callback for {@link
  * KeyChain#choosePrivateKeyAlias}.
@@ -25,5 +27,5 @@ public interface KeyChainAliasCallback {
      * Called with the alias of the certificate chosen by the user, or
      * null if no value was chosen.
      */
-    public void alias(String alias);
+    public void alias(@Nullable String alias);
 }