Fixes touch ripples on media buttons.

This change makes touch ripples appear correctly on the action buttons
on media notifications.  This involves the following changes:

- NotificationViewWrapper.onReinflated() sets the notification content
root's background to transparent rather than null when transferring the
background color to the NotificationBackgroundView.  This gives the
ripples a surface to draw on.
- The RemoteViews for the media templates are changed to use a fixed
set of buttons instead of removing and re-adding them on every update.
This prevents the update caused by whatever action the tap invokes from
interrupting the ripples.
- A method is added to RemoteViews allowing the ripple color to be
specified.  This allows us to change the ripple color to match the
foreground color of the controls, which is necessary for the ripples to
show up against a dark background.

Test: manual
Change-Id: I907f9a1a75efb48da496133ad357fc5150de4410
Fixes: 35856702

1 files changed, 67 insertions, 0 deletions

diff --git a/core/java/android/widget/RemoteViews.java b/core/java/android/widget/RemoteViews.java
index 35ff6cc23499..8f17e96c144e 100644
--- a/core/java/android/widget/RemoteViews.java
+++ b/core/java/android/widget/RemoteViews.java
@@ -42,6 +42,7 @@ import android.graphics.PorterDuff;
 import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
 import android.graphics.drawable.Icon;
+import android.graphics.drawable.RippleDrawable;
 import android.net.Uri;
 import android.os.AsyncTask;
 import android.os.Binder;
@@ -152,6 +153,7 @@ public class RemoteViews implements Parcelable, Filter {
     private static final int SET_REMOTE_INPUTS_ACTION_TAG = 18;
     private static final int LAYOUT_PARAM_ACTION_TAG = 19;
     private static final int OVERRIDE_TEXT_COLORS_TAG = 20;
+    private static final int SET_RIPPLE_DRAWABLE_COLOR_TAG = 21;
 
     /**
      * Application that hosts the remote views.
@@ -1122,6 +1124,53 @@ public class RemoteViews implements Parcelable, Filter {
         PorterDuff.Mode filterMode;
     }
 
+    /**
+     * Equivalent to calling
+     * {@link RippleDrawable#setColor(ColorStateList)},
+     * on the {@link Drawable} of a given view.
+     * <p>
+     * The operation will be performed on the {@link Drawable} returned by the
+     * target {@link View#getBackground()}.
+     * <p>
+     */
+    private class SetRippleDrawableColor extends Action {
+
+        ColorStateList mColorStateList;
+
+        SetRippleDrawableColor(int id, ColorStateList colorStateList) {
+            this.viewId = id;
+            this.mColorStateList = colorStateList;
+        }
+
+        SetRippleDrawableColor(Parcel parcel) {
+            viewId = parcel.readInt();
+            mColorStateList = parcel.readParcelable(null);
+        }
+
+        public void writeToParcel(Parcel dest, int flags) {
+            dest.writeInt(viewId);
+            dest.writeParcelable(mColorStateList, 0);
+        }
+
+        @Override
+        public void apply(View root, ViewGroup rootParent, OnClickHandler handler) {
+            final View target = root.findViewById(viewId);
+            if (target == null) return;
+
+            // Pick the correct drawable to modify for this view
+            Drawable targetDrawable = target.getBackground();
+
+            if (targetDrawable instanceof RippleDrawable) {
+                ((RippleDrawable) targetDrawable.mutate()).setColor(mColorStateList);
+            }
+        }
+
+        @Override
+        public int getActionTag() {
+            return SET_RIPPLE_DRAWABLE_COLOR_TAG;
+        }
+    }
+
     private final class ViewContentNavigation extends Action {
         final boolean mNext;
 
@@ -2394,6 +2443,8 @@ public class RemoteViews implements Parcelable, Filter {
                 return new LayoutParamAction(parcel);
             case OVERRIDE_TEXT_COLORS_TAG:
                 return new OverrideTextColorsAction(parcel);
+            case SET_RIPPLE_DRAWABLE_COLOR_TAG:
+                return new SetRippleDrawableColor(parcel);
             default:
                 throw new ActionException("Tag " + tag + " not found");
         }
@@ -2855,6 +2906,22 @@ public class RemoteViews implements Parcelable, Filter {
 
     /**
      * @hide
+     * Equivalent to calling
+     * {@link RippleDrawable#setColor(ColorStateList)} on the {@link Drawable} of a given view,
+     * assuming it's a {@link RippleDrawable}.
+     * <p>
+     *
+     * @param viewId The id of the view that contains the target
+     *            {@link RippleDrawable}
+     * @param colorStateList Specify a color for a
+     *            {@link ColorStateList} for this drawable.
+     */
+    public void setRippleDrawableColor(int viewId, ColorStateList colorStateList) {
+        addAction(new SetRippleDrawableColor(viewId, colorStateList));
+    }
+
+    /**
+     * @hide
      * Equivalent to calling {@link android.widget.ProgressBar#setProgressTintList}.
      *
      * @param viewId The id of the view whose tint should change