Refactor ProximityUpdateCallbackInternal to interface

Refactor ProximityUpdateCallbackInternal to interface. Also making sure
that the service unbinding happens when clear Attention Service command
is received.

Bug: 214395649
Test: atest CtsVoiceInteractionTestCases, atest CtsAttentionServiceDeviceTestCases
Change-Id: If8c23a9c68952e323fcb8eeb681e86b0e6119b18

core/java/android/attention/AttentionManagerInternal.java

@@ -83,11 +83,11 @@ public abstract class AttentionManagerInternal {
     }
 
     /** Internal interface for proximity callback. */
-    public abstract static class ProximityUpdateCallbackInternal {
+    public interface ProximityUpdateCallbackInternal {
         /**
          * @param distance the estimated distance of the user (in meter)
          * The distance will be PROXIMITY_UNKNOWN if the proximity sensing was inconclusive.
          */
-        public abstract void onProximityUpdate(double distance);
+        void onProximityUpdate(double distance);
     }
 }

services/core/java/com/android/server/attention/AttentionManagerService.java

@@ -856,9 +856,6 @@ public class AttentionManagerService extends SystemService {
     @GuardedBy("mLock")
     private void cancelAndUnbindLocked() {
         synchronized (mLock) {
-            if (mCurrentAttentionCheck == null && mCurrentProximityUpdate == null) {
-                return;
-            }
             if (mCurrentAttentionCheck != null) {
                 cancel();
             }
@@ -940,7 +937,7 @@ public class AttentionManagerService extends SystemService {
             }
         }
 
-        class TestableProximityUpdateCallbackInternal extends ProximityUpdateCallbackInternal {
+        class TestableProximityUpdateCallbackInternal implements ProximityUpdateCallbackInternal {
             private double mLastCallbackCode = PROXIMITY_UNKNOWN;
 
             @Override
@@ -1072,6 +1069,7 @@ public class AttentionManagerService extends SystemService {
         private void resetStates() {
             synchronized (mLock) {
                 mCurrentProximityUpdate = null;
+                cancelAndUnbindLocked();
             }
             mComponentName = resolveAttentionService(mContext);
         }

services/voiceinteraction/java/com/android/server/voiceinteraction/HotwordDetectionConnection.java

@@ -192,14 +192,7 @@ final class HotwordDetectionConnection {
     final AttentionManagerInternal mAttentionManagerInternal;
 
     final AttentionManagerInternal.ProximityUpdateCallbackInternal mProximityCallbackInternal =
-            new AttentionManagerInternal.ProximityUpdateCallbackInternal() {
-        @Override
-        public void onProximityUpdate(double distance) {
-            synchronized (mLock) {
-                mProximityMeters = distance;
-            }
-        }
-    };
+            this::setProximityMeters;
 
 
     volatile HotwordDetectionServiceIdentity mIdentity;
@@ -1190,6 +1183,12 @@ final class HotwordDetectionConnection {
         }
     }
 
+    private void setProximityMeters(double proximityMeters) {
+        synchronized (mLock) {
+            mProximityMeters = proximityMeters;
+        }
+    }
+
     private static void bestEffortClose(Closeable... closeables) {
         for (Closeable closeable : closeables) {
             bestEffortClose(closeable);