Gallery2: Fix monkey test fail

When click undo in filtershowActivity,the position can't be -1
In FilterShowActivity,the preset and Rect shouldn't be null.

Add some check for position and null pointer check for preset
and rect

CRs-fixed: 693810

Change-Id: I70fa2ff86d40ad483474b60ab9071ccb151bd445

1 files changed, 5 insertions, 3 deletions

diff --git a/src/com/android/gallery3d/filtershow/pipeline/ImagePreset.java b/src/com/android/gallery3d/filtershow/pipeline/ImagePreset.java
index 4765a5990..e2945e9b9 100644
--- a/src/com/android/gallery3d/filtershow/pipeline/ImagePreset.java
+++ b/src/com/android/gallery3d/filtershow/pipeline/ImagePreset.java
@@ -67,9 +67,11 @@ public class ImagePreset {
     }
 
     public ImagePreset(ImagePreset source) {
-        for (int i = 0; i < source.mFilters.size(); i++) {
-            FilterRepresentation sourceRepresentation = source.mFilters.elementAt(i);
-            mFilters.add(sourceRepresentation.copy());
+        if (source != null && source.mFilters != null) {
+            for (int i = 0; i < source.mFilters.size(); i++) {
+                FilterRepresentation sourceRepresentation = source.mFilters.elementAt(i);
+                mFilters.add(sourceRepresentation.copy());
+            }
         }
     }