Expose some SystemApis and edit framework-cellbroadcast-shared-srcs

The APIs are used in the CellBroadcastService, and the
framework-cellbroadcast-shared-srcs library is also linked there.

Bug: 135956699
Test: manual
Change-Id: I5e71ea1ee1a858c0520c241dc7365733441e0f50
Merged-In: I5e71ea1ee1a858c0520c241dc7365733441e0f50

Android.bp

@@ -1578,10 +1578,13 @@ genrule {
 filegroup {
     name: "framework-cellbroadcast-shared-srcs",
     srcs: [
-        "core/java/android/util/LocalLog.java",
+	"core/java/android/os/HandlerExecutor.java",
+	"core/java/android/util/LocalLog.java",
         "core/java/android/util/Slog.java",
-        "core/java/com/android/internal/util/State.java",
-        "core/java/com/android/internal/util/StateMachine.java",
+	"core/java/com/android/internal/util/IState.java",
+	"core/java/com/android/internal/util/Preconditions.java",
+	"core/java/com/android/internal/util/State.java",
+	"core/java/com/android/internal/util/StateMachine.java",
     ],
 }
 

api/system-current.txt

@@ -8538,6 +8538,7 @@ package android.telephony {
     method @NonNull public android.content.ContentValues getContentValues();
     method @Nullable public android.telephony.SmsCbEtwsInfo getEtwsWarningInfo();
     method public int getGeographicalScope();
+    method @NonNull public java.util.List<android.telephony.CbGeoUtils.Geometry> getGeometries();
     method @Nullable public String getLanguageCode();
     method @NonNull public android.telephony.SmsCbLocation getLocation();
     method public int getMaximumWaitingDuration();

telephony/java/android/telephony/SmsCbMessage.java

@@ -29,6 +29,7 @@ import android.telephony.CbGeoUtils.Geometry;
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
+import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -407,13 +408,17 @@ public final class SmsCbMessage implements Parcelable {
     }
 
     /**
-     * Get the warning area coordinates information represent by polygons and circles.
-     * @return a list of geometries, {@link Nullable} means there is no coordinate information
-     * associated to this message.
+     * Get the warning area coordinates information represented by polygons and circles.
+     * @return a list of geometries, or an empty list if there is no coordinate information
+     * associated with this message.
      * @hide
      */
-    @Nullable
+    @SystemApi
+    @NonNull
     public List<Geometry> getGeometries() {
+        if (mGeometries == null) {
+            return new ArrayList<>();
+        }
         return mGeometries;
     }
 
@@ -720,6 +725,6 @@ public final class SmsCbMessage implements Parcelable {
      * @return {@code True} if this message needs geo-fencing check.
      */
     public boolean needGeoFencingCheck() {
-        return mMaximumWaitTimeSec > 0 && mGeometries != null;
+        return mMaximumWaitTimeSec > 0 && mGeometries != null && !mGeometries.isEmpty();
     }
 }