Fix "The specified child already has a parent" IllegalStateException.

The problem was due to a race condition between removing a prebound
widget view from the drag layer and adding the same view to the
workspace upon dropping it; if you let go of the widget immediately
after picking it up, the latter happened before the former.

Specifically, the flow was: long-click a widget --> drop --> remove
the view from the drag layer if it's not null (it is, so nothing
happens) --> the view is finally bound/inflated and added to the drag
layer --> add the view to the workspace --> already has a parent.

There are actually 2 problems here: one is that the bind/inflate is
asynchronous, and can therefore happen after dropping the widget view
being inflated, and the other is that the view is added to the
workspace even though the transition has barely started (we usually
ignore drops if the transition is less than half complete). It turns
out that this second problem was also due to a race condition, this
time between dropping a widget or app onto the workspace and calling
LauncherStateTransitionAnimation.dispatchOnLauncherTransitionStart().
If the drop happened before the dispatch, as in the case of the
crash, then the drop was accepted because the transition progress was
still 1.0 from the previous transition.

I fixed the first problem by removing the drag layer widget view
in Launcher where it is potentially used instead of Workspace. And I
fixed the second problem by setting mTransitionProgress to 0 in
Workspace.onLauncherTransitionPrepare().

I also added some debugging logs.

Bug: 23896857
Change-Id: I66944e6d3f23b70dea15f7fb01af0763a1bfcbda

1 files changed, 9 insertions, 6 deletions

diff --git a/src/com/android/launcher3/widget/WidgetsContainerView.java b/src/com/android/launcher3/widget/WidgetsContainerView.java
index 64d33aa09..b780f590b 100644
--- a/src/com/android/launcher3/widget/WidgetsContainerView.java
+++ b/src/com/android/launcher3/widget/WidgetsContainerView.java
@@ -52,10 +52,9 @@ import com.android.launcher3.util.Thunk;
  * The widgets list view container.
  */
 public class WidgetsContainerView extends BaseContainerView
-        implements View.OnLongClickListener, View.OnClickListener, DragSource{
-
+        implements View.OnLongClickListener, View.OnClickListener, DragSource {
     private static final String TAG = "WidgetsContainerView";
-    private static final boolean DEBUG = false;
+    private static final boolean LOGD = false;
 
     /* Coefficient multiplied to the screen height for preloading widgets. */
     private static final int PRELOAD_SCREEN_HEIGHT_MULTIPLE = 1;
@@ -92,13 +91,14 @@ public class WidgetsContainerView extends BaseContainerView
         mDragController = mLauncher.getDragController();
         mAdapter = new WidgetsListAdapter(context, this, this, mLauncher);
         mIconCache = (LauncherAppState.getInstance()).getIconCache();
-        if (DEBUG) {
+        if (LOGD) {
             Log.d(TAG, "WidgetsContainerView constructor");
         }
     }
 
     @Override
     protected void onFinishInflate() {
+        super.onFinishInflate();
         mContent = findViewById(R.id.content);
         mView = (WidgetsRecyclerView) findViewById(R.id.widgets_list_view);
         mView.setAdapter(mAdapter);
@@ -158,7 +158,7 @@ public class WidgetsContainerView extends BaseContainerView
 
     @Override
     public boolean onLongClick(View v) {
-        if (DEBUG) {
+        if (LOGD) {
             Log.d(TAG, String.format("onLonglick [v=%s]", v));
         }
         // Return early if this is not initiated from a touch
@@ -173,7 +173,7 @@ public class WidgetsContainerView extends BaseContainerView
         if (status && v.getTag() instanceof PendingAddWidgetInfo) {
             WidgetHostViewLoader hostLoader = new WidgetHostViewLoader(mLauncher, v);
             boolean preloadStatus = hostLoader.preloadWidget();
-            if (DEBUG) {
+            if (LOGD) {
                 Log.d(TAG, String.format("preloading widget [status=%s]", preloadStatus));
             }
             mLauncher.getDragController().addDragListener(hostLoader);
@@ -302,6 +302,9 @@ public class WidgetsContainerView extends BaseContainerView
     @Override
     public void onDropCompleted(View target, DragObject d, boolean isFlingToDelete,
             boolean success) {
+        if (LOGD) {
+            Log.d(TAG, "onDropCompleted");
+        }
         if (isFlingToDelete || !success || (target != mLauncher.getWorkspace() &&
                 !(target instanceof DeleteDropTarget) && !(target instanceof Folder))) {
             // Exit spring loaded mode if we have not successfully dropped or have not handled the