Fixing crash.

b/28179361

Change-Id: I5c6049efcd0c43f3b0e595648fd331c2a82d4d73

packages/SystemUI/src/com/android/systemui/recents/model/Task.java

@@ -315,6 +315,15 @@ public class Task {
         return key.id != affiliationTaskId;
     }
 
+    /**
+     * Returns the top activity component.
+     */
+    public ComponentName getTopComponent() {
+        return topActivity != null
+                ? topActivity
+                : key.baseIntent.getComponent();
+    }
+
     @Override
     public boolean equals(Object o) {
         // Check that the id matches

packages/SystemUI/src/com/android/systemui/recents/views/RecentsView.java

@@ -541,7 +541,7 @@ public class RecentsView extends FrameLayout {
                     true /* scaleUp */);
 
             MetricsLogger.action(mContext, MetricsEvent.ACTION_WINDOW_DOCK_DRAG_DROP,
-                    event.task.topActivity.flattenToShortString());
+                    event.task.getTopComponent().flattenToShortString());
         } else {
             // Animate the overlay alpha back to 0
             updateVisibleDockRegions(null, true /* isDefaultDockState */, -1,

packages/SystemUI/src/com/android/systemui/recents/views/RecentsViewTouchHandler.java

@@ -162,7 +162,8 @@ public class RecentsViewTouchHandler {
         mVisibleDockStates.clear();
         if (ActivityManager.supportsMultiWindow() && !ssp.hasDockedTask()
                 && mDividerSnapAlgorithm.isSplitScreenFeasible()) {
-            Recents.logDockAttempt(mRv.getContext(), event.task.topActivity, event.task.resizeMode);
+            Recents.logDockAttempt(mRv.getContext(), event.task.getTopComponent(),
+                    event.task.resizeMode);
             if (!event.task.isDockable) {
                 EventBus.getDefault().send(new ShowIncompatibleAppOverlayEvent());
             } else {