From 9f811fd447206ed964fb576f55c1b38b76b45a4c Mon Sep 17 00:00:00 2001
From: Dake Gu <dake@google.com>
Date: Fri, 1 Feb 2013 15:54:22 -0800
Subject: SimulatdDpad: fix NPE for event without device

Fix a rare case that We lost device(due to network issue)
and SimulatedDpad received the MotionEvent without device.

b/8121964

Change-Id: Ie2948e6ff14a84422b05dda8ea87a3571f26f252
---
 core/java/android/view/SimulatedDpad.java | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/core/java/android/view/SimulatedDpad.java b/core/java/android/view/SimulatedDpad.java
index 0a37fddfa805..b03e4c71ec06 100644
--- a/core/java/android/view/SimulatedDpad.java
+++ b/core/java/android/view/SimulatedDpad.java
@@ -145,6 +145,10 @@ class SimulatedDpad {
         if (!synthesizeNewKeys) {
             mHandler.removeMessages(MSG_FLICK);
         }
+        InputDevice device = event.getDevice();
+        if (device == null) {
+            return;
+        }
         // Store what time the touchpad event occurred
         final long time = SystemClock.uptimeMillis();
         switch (event.getAction()) {
@@ -157,7 +161,7 @@ class SimulatedDpad {
                 mAccumulatedY = 0;
                 mLastMoveX = 0;
                 mLastMoveY = 0;
-                if (event.getDevice().getMotionRange(MotionEvent.AXIS_Y).getMax()
+                if (device.getMotionRange(MotionEvent.AXIS_Y).getMax()
                         * EDGE_SWIPE_THRESHOLD < event.getY()) {
                     // Did the swipe begin in a valid region
                     mEdgeSwipePossible = true;
@@ -176,7 +180,7 @@ class SimulatedDpad {
                 }
                 // Checks if the swipe has crossed the midpoint
                 // and if our swipe gesture is complete
-                if (event.getY() < (event.getDevice().getMotionRange(MotionEvent.AXIS_Y).getMax()
+                if (event.getY() < (device.getMotionRange(MotionEvent.AXIS_Y).getMax()
                         * .5) && mEdgeSwipePossible) {
                     mEdgeSwipePossible = false;
 
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