Fix exception when fragment container has no View.

Bug 17535259

Change-Id: I29c9ef53dd693cbb4043ebfb4750753870c9e99a

4 files changed, 17 insertions, 0 deletions

diff --git a/core/java/android/app/Activity.java b/core/java/android/app/Activity.java
index 701ab1d..9e53a35 100644
--- a/core/java/android/app/Activity.java
+++ b/core/java/android/app/Activity.java
@@ -745,6 +745,11 @@ public class Activity extends ContextThemeWrapper
         public View findViewById(int id) {
             return Activity.this.findViewById(id);
         }
+        @Override
+        public boolean hasView() {
+            Window window = Activity.this.getWindow();
+            return (window != null && window.peekDecorView() != null);
+        }
     };
 
     // Most recent call to requestVisibleBehind().
diff --git a/core/java/android/app/BackStackRecord.java b/core/java/android/app/BackStackRecord.java
index 832e1e3..8644c3d 100644
--- a/core/java/android/app/BackStackRecord.java
+++ b/core/java/android/app/BackStackRecord.java
@@ -868,6 +868,9 @@ final class BackStackRecord extends FragmentTransaction implements
      */
     private void calculateFragments(SparseArray<Fragment> firstOutFragments,
             SparseArray<Fragment> lastInFragments) {
+        if (!mManager.mContainer.hasView()) {
+            return; // nothing to see, so no transitions
+        }
         Op op = mHead;
         while (op != null) {
             switch (op.cmd) {
@@ -923,6 +926,9 @@ final class BackStackRecord extends FragmentTransaction implements
      */
     public void calculateBackFragments(SparseArray<Fragment> firstOutFragments,
             SparseArray<Fragment> lastInFragments) {
+        if (!mManager.mContainer.hasView()) {
+            return; // nothing to see, so no transitions
+        }
         Op op = mHead;
         while (op != null) {
             switch (op.cmd) {
diff --git a/core/java/android/app/Fragment.java b/core/java/android/app/Fragment.java
index a95abab..5196834 100644
--- a/core/java/android/app/Fragment.java
+++ b/core/java/android/app/Fragment.java
@@ -2015,6 +2015,11 @@ public class Fragment implements ComponentCallbacks2, OnCreateContextMenuListene
                 }
                 return mView.findViewById(id);
             }
+
+            @Override
+            public boolean hasView() {
+                return (mView != null);
+            }
         }, this);
     }
 
diff --git a/core/java/android/app/FragmentManager.java b/core/java/android/app/FragmentManager.java
index ef69fdd..fc761fe 100644
--- a/core/java/android/app/FragmentManager.java
+++ b/core/java/android/app/FragmentManager.java
@@ -395,6 +395,7 @@ final class FragmentManagerState implements Parcelable {
  */
 interface FragmentContainer {
     public View findViewById(int id);
+    public boolean hasView();
 }
 
 /**