Fix 2 NPEs in the Browser.

The first was from freeMemory getting a tab back that had already been freed.
This is a really hard case to reproduce but it appears that it can happen. So
just check for a null mMainView before trying to free the tab.

The second was a null mTabOverview during the onAnimationStart method when
animating to the tab overview. I think this is caused by message delays not
being accurate enough to ensure the overview has been created. A check for null
fixes the problem for now but I am working on a better solution to ensure
animation message order.

2 files changed, 9 insertions, 6 deletions

diff --git a/src/com/android/browser/BrowserActivity.java b/src/com/android/browser/BrowserActivity.java
index 8fb853fd..eae24f1a 100644
--- a/src/com/android/browser/BrowserActivity.java
+++ b/src/com/android/browser/BrowserActivity.java
@@ -2112,10 +2112,12 @@ public class BrowserActivity extends Activity
         final Animation.AnimationListener l =
                 new Animation.AnimationListener() {
                     public void onAnimationStart(Animation a) {
-                        mTabOverview.requestFocus();
-                        // Clear the listener so we don't trigger a tab
-                        // selection.
-                        mTabOverview.setListener(null);
+                        if (mTabOverview != null) {
+                            mTabOverview.requestFocus();
+                            // Clear the listener so we don't trigger a tab
+                            // selection.
+                            mTabOverview.setListener(null);
+                        }
                     }
                     public void onAnimationRepeat(Animation a) {}
                     public void onAnimationEnd(Animation a) {
diff --git a/src/com/android/browser/TabControl.java b/src/com/android/browser/TabControl.java
index 581d144e..575be8d7 100644
--- a/src/com/android/browser/TabControl.java
+++ b/src/com/android/browser/TabControl.java
@@ -709,8 +709,9 @@ class TabControl {
             t = mTabQueue.get(i++);
         } while (i < queueSize && t != null && t.mMainView == null);
 
-        // Don't do anything if the last remaining tab is the current one.
-        if (t == getCurrentTab()) {
+        // Don't do anything if the last remaining tab is the current one or if
+        // the last tab has been freed already.
+        if (t == getCurrentTab() || t.mMainView == null) {
             return null;
         }