am 3754899: Merge "StorageManager: fix issue that GREF has increased to 2011 in system server with intel stress test."

* commit '37548994e69292932e9e2fafb7cba6c53e3a2bcd':
  StorageManager: fix issue that GREF has increased to 2011 in system server with intel stress test.

Author: Jean-Baptiste Queru

core/java/android/os/storage/StorageManager.java

@@ -56,7 +56,7 @@ public class StorageManager
     /*
      * Our internal MountService binder reference
      */
-    private IMountService mMountService;
+    final private IMountService mMountService;
 
     /*
      * The looper target for callbacks
@@ -304,8 +304,6 @@ public StorageManager(Looper tgtLooper) throws RemoteException {
             return;
         }
         mTgtLooper = tgtLooper;
-        mBinderListener = new MountServiceBinderListener();
-        mMountService.registerListener(mBinderListener);
     }
 
 
@@ -322,6 +320,15 @@ public void registerListener(StorageEventListener listener) {
         }
 
         synchronized (mListeners) {
+            if (mBinderListener == null ) {
+                try {
+                    mBinderListener = new MountServiceBinderListener();
+                    mMountService.registerListener(mBinderListener);
+                } catch (RemoteException rex) {
+                    Log.e(TAG, "Register mBinderListener failed");
+                    return;
+                }
+            }
             mListeners.add(new ListenerDelegate(listener));
         }
     }
@@ -347,7 +354,15 @@ public void unregisterListener(StorageEventListener listener) {
                     break;
                 }
             }
-        }
+            if (mListeners.size() == 0 && mBinderListener != null) {
+                try {
+                    mMountService.unregisterListener(mBinderListener);
+                } catch (RemoteException rex) {
+                    Log.e(TAG, "Unregister mBinderListener failed");
+                    return;
+                }
+            }
+       }
     }
 
     /**