QS: Don't assume observers are registered when dealing with changes

Not all uri activity has an associated content observer. Poking
the content://settings/system provider manually, for example,
would result in the following NPE:

AndroidRuntime: FATAL EXCEPTION: main
AndroidRuntime: java.lang.NullPointerException
AndroidRuntime:        at com.android.systemui.statusbar.phone.QuickSettingsController$QuickSettingsObserver.onChange(QuickSettingsController.java:354)
AndroidRuntime:        at android.database.ContentObserver$NotificationRunnable.run(ContentObserver.java:180)
AndroidRuntime:        at android.os.Handler.handleCallback(Handler.java:725)

Change-Id: I7034d261804aa972fe9020dd9b602348d249cb33

1 files changed, 4 insertions, 2 deletions

diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsController.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsController.java
index 834dfd4..f72b56c 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsController.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsController.java
@@ -351,8 +351,10 @@ public class QuickSettingsController {
                 mHandler.sendEmptyMessage(MSG_UPDATE_TILES);
             } else {
                 ContentResolver resolver = mContext.getContentResolver();
-                for (QuickSettingsTile tile : mObserverMap.get(uri)) {
-                    tile.onChangeUri(resolver, uri);
+                if (mObserverMap != null && mObserverMap.get(uri) != null) {
+                    for (QuickSettingsTile tile : mObserverMap.get(uri)) {
+                        tile.onChangeUri(resolver, uri);
+                    }
                 }
             }
         }