Ensure adapter is not null in AutoCompleteTextView

A runnable is posted for AutoCompleteTextView's PopupDataSetObserver, but
there's a possibility that mAdapter would be set to null between when
the runnable is run and the time it is posted.

This fixes a monkey crash seen in build 29176.

Change-Id: Ie7be51db580d6e9775533890e5f6902409bec84d
MonkeyCrashID: 2071507494::1632:123:521

1 files changed, 4 insertions, 1 deletions

diff --git a/core/java/android/widget/AutoCompleteTextView.java b/core/java/android/widget/AutoCompleteTextView.java
index 5b521072b41e..eb2da7149762 100644
--- a/core/java/android/widget/AutoCompleteTextView.java
+++ b/core/java/android/widget/AutoCompleteTextView.java
@@ -1629,7 +1629,10 @@ public class AutoCompleteTextView extends EditText implements Filter.FilterListe
                 // of iterating throught he list of observers.
                 post(new Runnable() {
                     public void run() {
-                        updateDropDownForFilter(mAdapter.getCount());
+                        final ListAdapter adapter = mAdapter;
+                        if (adapter != null) {
+                            updateDropDownForFilter(adapter.getCount());
+                        }
                     }
                 });
             }