Prevents ListView items children to modify properties of other children.

Bug #2464502

This fix introduce a new dispatch mechanism to tell views when they are temporary
detached/reattached from/to a ListView. This is very important to remove pending
callbacks or cleanup temporary states.

This change also modifies TextView which was relying on that callback in a very
particular case: a focused EditText in a ListView. The modified code acts only
when in that case, not if onStart/FinishTemporaryDetach() is called via
dispatch*() (== recycled views in ListView.)

core/java/android/widget/AbsListView.java

@@ -1314,7 +1314,8 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
                             position, -1);
                 }
             } else {
-                isScrap[0] = true;                
+                isScrap[0] = true;
+                child.dispatchFinishTemporaryDetach();
             }
         } else {
             child = mAdapter.getView(position, null, this);
@@ -4145,8 +4146,10 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
             }
 
             if (mViewTypeCount == 1) {
+                scrap.dispatchStartTemporaryDetach();
                 mCurrentScrap.add(scrap);
             } else {
+                scrap.dispatchStartTemporaryDetach();
                 mScrapViews[viewType].add(scrap);
             }
 
@@ -4165,7 +4168,7 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
 
             ArrayList<View> scrapViews = mCurrentScrap;
             final int count = activeViews.length;
-            for (int i = 0; i < count; ++i) {
+            for (int i = count - 1; i >= 0; i--) {
                 final View victim = activeViews[i];
                 if (victim != null) {
                     int whichScrap = ((AbsListView.LayoutParams) victim.getLayoutParams()).viewType;
@@ -4181,6 +4184,7 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
                     if (multipleScraps) {
                         scrapViews = mScrapViews[whichScrap];
                     }
+                    victim.dispatchStartTemporaryDetach();
                     scrapViews.add(victim);
 
                     if (hasListener) {

core/java/android/widget/ListView.java

@@ -1485,7 +1485,6 @@ public class ListView extends AbsListView {
             }
 
             // Clear out old views
-            //removeAllViewsInLayout();
             detachAllViewsFromParent();
 
             switch (mLayoutMode) {

core/java/android/widget/TextView.java

@@ -198,6 +198,7 @@ public class TextView extends View implements ViewTreeObserver.OnPreDrawListener
     private boolean mFreezesText;
     private boolean mFrozenWithFocus;
     private boolean mTemporaryDetach;
+    private boolean mDispatchTemporaryDetach;
 
     private boolean mEatTouchRelease = false;
     private boolean mScrolled = false;
@@ -6371,14 +6372,27 @@ public class TextView extends View implements ViewTreeObserver.OnPreDrawListener
         mBlink.postAtTime(mBlink, mShowCursor + BLINK);
     }
 
+    @Override
+    public void dispatchFinishTemporaryDetach() {
+        mDispatchTemporaryDetach = true;
+        super.dispatchFinishTemporaryDetach();
+        mDispatchTemporaryDetach = false;
+    }
+
     @Override
     public void onStartTemporaryDetach() {
-        mTemporaryDetach = true;
+        super.onStartTemporaryDetach();
+        // Only track when onStartTemporaryDetach() is called directly,
+        // usually because this instance is an editable field in a list
+        if (!mDispatchTemporaryDetach) mTemporaryDetach = true;
     }
     
     @Override
     public void onFinishTemporaryDetach() {
-        mTemporaryDetach = false;
+        super.onFinishTemporaryDetach();
+        // Only track when onStartTemporaryDetach() is called directly,
+        // usually because this instance is an editable field in a list
+        if (!mDispatchTemporaryDetach) mTemporaryDetach = false;
     }
     
     @Override