AI 148024: fix NPE when there is no history

Automated import of CL 148024

1 files changed, 6 insertions, 4 deletions

diff --git a/core/java/android/view/MotionEvent.java b/core/java/android/view/MotionEvent.java
index 24026601145e..0d5567908af8 100644
--- a/core/java/android/view/MotionEvent.java
+++ b/core/java/android/view/MotionEvent.java
@@ -225,10 +225,12 @@ public final class MotionEvent implements Parcelable {
             mSize *= scale;
             mXPrecision *= scale;
             mYPrecision *= scale;
-            float[] history = mHistory;
-            int length = history.length;
-            for (int i = 0; i < length; i++) {
-                history[i] *= scale;
+            if (mHistory != null) {
+                float[] history = mHistory;
+                int length = history.length;
+                for (int i = 0; i < length; i++) {
+                    history[i] *= scale;
+                }
             }
         }
     }