Fix share crash after closing photo editor

Bug: 7306707
Change-Id: If589e1d84bc05c4d68a02feed7aaed05a568359d
diff --git a/src/com/android/gallery3d/filtershow/FilterShowActivity.java b/src/com/android/gallery3d/filtershow/FilterShowActivity.java
index 80849b1..f2fb3da 100644
--- a/src/com/android/gallery3d/filtershow/FilterShowActivity.java
+++ b/src/com/android/gallery3d/filtershow/FilterShowActivity.java
@@ -331,6 +331,22 @@
     }
 
     @Override
+    public void onPause() {
+        super.onPause();
+        if (mShareActionProvider != null) {
+            mShareActionProvider.setOnShareTargetSelectedListener(null);
+        }
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        if (mShareActionProvider != null) {
+            mShareActionProvider.setOnShareTargetSelectedListener(this);
+        }
+    }
+
+    @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         switch (item.getItemId()) {
             case R.id.undoButton: {