Add workaround for b/124210145

Problem description:
Metalava emits signature of a method under a class, even when the method
is not defined in the class when the method is inherited from a hidden
ancestor and the method is part of the public interface that the class
is expected to implement.

To be specific, inside the api signature, MmbmsDownloadServiceBase has
asBinder() and onTransact(). The methods are not defined in the class
but inherited from the auto-generated hidden class
IMbmsDownloadService.Stub. However, since the methods are also declared
in the public ancestors of the class, e.g., Binder and IInterface,
the methods are force-included in the class. Omitting the methods will
cause problem when building the stub version of the class.

This inclusion of the inherited method is breaking
SystemApiAnnotationTest. That's because the test ensures that a symbol
listed in the API signature file for the System API is actually
annotated with @SystemApi.

Solution:
To workaround the issue, actually implement the auto-generated methods
inside the class and annotate them.

Bug: 124210145
Test: atest CtsSystemApiAnnotationTestCases
Change-Id: I6760f6e4068239361c495ae7c0de3e25f91d38e1

2 files changed, 37 insertions, 0 deletions

diff --git a/telephony/java/android/telephony/mbms/vendor/MbmsDownloadServiceBase.java b/telephony/java/android/telephony/mbms/vendor/MbmsDownloadServiceBase.java
index a9f10b1b460f..9f22d0a49806 100644
--- a/telephony/java/android/telephony/mbms/vendor/MbmsDownloadServiceBase.java
+++ b/telephony/java/android/telephony/mbms/vendor/MbmsDownloadServiceBase.java
@@ -549,4 +549,22 @@ public class MbmsDownloadServiceBase extends IMbmsDownloadService.Stub {
      */
     public void onAppCallbackDied(int uid, int subscriptionId) {
     }
+
+    // Following two methods exist to workaround b/124210145
+    /** @hide */
+    @SystemApi
+    @TestApi
+    @Override
+    public android.os.IBinder asBinder() {
+        return super.asBinder();
+    }
+
+    /** @hide */
+    @SystemApi
+    @TestApi
+    @Override
+    public boolean onTransact(int code, android.os.Parcel data, android.os.Parcel reply,
+            int flags) throws RemoteException {
+        return super.onTransact(code, data, reply, flags);
+    }
 }
diff --git a/telephony/java/android/telephony/mbms/vendor/MbmsStreamingServiceBase.java b/telephony/java/android/telephony/mbms/vendor/MbmsStreamingServiceBase.java
index 5ce612db49d6..cced44759527 100644
--- a/telephony/java/android/telephony/mbms/vendor/MbmsStreamingServiceBase.java
+++ b/telephony/java/android/telephony/mbms/vendor/MbmsStreamingServiceBase.java
@@ -294,4 +294,23 @@ public class MbmsStreamingServiceBase extends IMbmsStreamingService.Stub {
      */
     public void onAppCallbackDied(int uid, int subscriptionId) {
     }
+
+
+    // Following two methods exist to workaround b/124210145
+    /** @hide */
+    @SystemApi
+    @TestApi
+    @Override
+    public android.os.IBinder asBinder() {
+        return super.asBinder();
+    }
+
+    /** @hide */
+    @SystemApi
+    @TestApi
+    @Override
+    public boolean onTransact(int code, android.os.Parcel data, android.os.Parcel reply,
+            int flags) throws RemoteException {
+        return super.onTransact(code, data, reply, flags);
+    }
 }