am 78528b22: Fixed a RTL layouting bug with LinearLayout

* commit '78528b22c29f570469fe3c75328042f83a5a24c3':
  Fixed a RTL layouting bug with LinearLayout

core/java/android/util/LayoutDirection.java

@@ -26,6 +26,12 @@ public final class LayoutDirection {
     // No instantiation
     private LayoutDirection() {}
 
+    /**
+     * An undefined layout direction.
+     * @hide
+     */
+    public static final int UNDEFINED = -1;
+
     /**
      * Horizontal layout direction is from Left to Right.
      */

core/java/android/view/View.java

@@ -1871,6 +1871,12 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
     @Retention(RetentionPolicy.SOURCE)
     public @interface ResolvedLayoutDir {}
 
+    /**
+     * A flag to indicate that the layout direction of this view has not been defined yet.
+     * @hide
+     */
+    public static final int LAYOUT_DIRECTION_UNDEFINED = LayoutDirection.UNDEFINED;
+
     /**
      * Horizontal layout direction of this view is from Left to Right.
      * Use with {@link #setLayoutDirection}.

core/java/android/widget/LinearLayout.java

@@ -185,6 +185,8 @@ public class LinearLayout extends ViewGroup {
     private int mShowDividers;
     private int mDividerPadding;
 
+    private int mLayoutDirection = View.LAYOUT_DIRECTION_UNDEFINED;
+
     public LinearLayout(Context context) {
         this(context, null);
     }
@@ -1567,6 +1569,17 @@ public class LinearLayout extends ViewGroup {
         }
     }
 
+    @Override
+    public void onRtlPropertiesChanged(@ResolvedLayoutDir int layoutDirection) {
+        super.onRtlPropertiesChanged(layoutDirection);
+        if (layoutDirection != mLayoutDirection) {
+            mLayoutDirection = layoutDirection;
+            if (mOrientation == HORIZONTAL) {
+                requestLayout();
+            }
+        }
+    }
+
     /**
      * Position the children during a layout pass if the orientation of this
      * LinearLayout is set to {@link #HORIZONTAL}.