Improve DatePicker focus for keyboards.

Bug 24873983

Focus moves properly within the SimpleMonthView and between
components of the DatePicker.

Change-Id: I61778f9b4f19536ff6c7a512f9b4faf7bf4447a7
diff --git a/core/java/com/android/internal/widget/ViewPager.java b/core/java/com/android/internal/widget/ViewPager.java
index 6217d6e..948a6bb 100644
--- a/core/java/com/android/internal/widget/ViewPager.java
+++ b/core/java/com/android/internal/widget/ViewPager.java
@@ -1095,7 +1095,16 @@
                     View child = getChildAt(i);
                     ii = infoForChild(child);
                     if (ii != null && ii.position == mCurItem) {
-                        if (child.requestFocus(focusDirection)) {
+                        final Rect focusRect;
+                        if (currentFocused == null) {
+                            focusRect = null;
+                        } else {
+                            focusRect = mTempRect;
+                            currentFocused.getFocusedRect(mTempRect);
+                            offsetDescendantRectToMyCoords(currentFocused, mTempRect);
+                            offsetRectIntoDescendantCoords(child, mTempRect);
+                        }
+                        if (child.requestFocus(focusDirection, focusRect)) {
                             break;
                         }
                     }
@@ -1321,6 +1330,11 @@
         }
     }
 
+    public Object getCurrent() {
+        final ItemInfo itemInfo = infoForPosition(getCurrentItem());
+        return itemInfo == null ? null : itemInfo.object;
+    }
+
     @Override
     public void removeView(View view) {
         if (mInLayout) {