diff --git a/core/java/android/view/NotificationHeaderView.java b/core/java/android/view/NotificationHeaderView.java
index 5804560..ab0b3ee 100644
--- a/core/java/android/view/NotificationHeaderView.java
+++ b/core/java/android/view/NotificationHeaderView.java
@@ -20,6 +20,7 @@
 import android.app.Notification;
 import android.content.Context;
 import android.content.res.Resources;
+import android.content.res.TypedArray;
 import android.graphics.Canvas;
 import android.graphics.Outline;
 import android.graphics.Rect;
@@ -43,6 +44,7 @@
     public static final int NO_COLOR = Notification.COLOR_INVALID;
     private final int mChildMinWidth;
     private final int mContentEndMargin;
+    private final int mGravity;
     private View mAppName;
     private View mHeaderText;
     private OnClickListener mExpandClickListener;
@@ -50,7 +52,6 @@
     private ImageView mExpandButton;
     private CachingIconView mIcon;
     private View mProfileBadge;
-    private View mInfo;
     private int mIconColor;
     private int mOriginalNotificationColor;
     private boolean mExpanded;
@@ -61,6 +62,7 @@
     private boolean mEntireHeaderClickable;
     private boolean mExpandOnlyOnButton;
     private boolean mAcceptAllTouches;
+    private int mTotalWidth;
 
     ViewOutlineProvider mProvider = new ViewOutlineProvider() {
         @Override
@@ -92,6 +94,11 @@
         mHeaderBackgroundHeight = res.getDimensionPixelSize(
                 R.dimen.notification_header_background_height);
         mEntireHeaderClickable = res.getBoolean(R.bool.config_notificationHeaderClickableForExpand);
+
+        int[] attrIds = { android.R.attr.gravity };
+        TypedArray ta = context.obtainStyledAttributes(attrs, attrIds, defStyleAttr, defStyleRes);
+        mGravity = ta.getInt(0, 0);
+        ta.recycle();
     }
 
     @Override
@@ -146,6 +153,7 @@
                 mHeaderText.measure(childWidthSpec, wrapContentHeightSpec);
             }
         }
+        mTotalWidth = Math.min(totalWidth, givenWidth);
         setMeasuredDimension(givenWidth, givenHeight);
     }
 
@@ -153,6 +161,10 @@
     protected void onLayout(boolean changed, int l, int t, int r, int b) {
         int left = getPaddingStart();
         int end = getMeasuredWidth();
+        final boolean centerAligned = (mGravity & Gravity.CENTER_HORIZONTAL) != 0;
+        if (centerAligned) {
+            left += getMeasuredWidth() / 2 - mTotalWidth / 2;
+        }
         int childCount = getChildCount();
         int ownHeight = getMeasuredHeight() - getPaddingTop() - getPaddingBottom();
         for (int i = 0; i < childCount; i++) {
diff --git a/core/java/com/android/internal/widget/NotificationActionListLayout.java b/core/java/com/android/internal/widget/NotificationActionListLayout.java
index 073aac5..26023b4 100644
--- a/core/java/com/android/internal/widget/NotificationActionListLayout.java
+++ b/core/java/com/android/internal/widget/NotificationActionListLayout.java
@@ -16,7 +16,10 @@
 
 package com.android.internal.widget;
 
+import android.annotation.Nullable;
 import android.content.Context;
+import android.content.res.Resources;
+import android.content.res.TypedArray;
 import android.graphics.drawable.Drawable;
 import android.util.AttributeSet;
 import android.util.Pair;
@@ -37,6 +40,7 @@
 @RemoteViews.RemoteView
 public class NotificationActionListLayout extends LinearLayout {
 
+    private final int mGravity;
     private int mTotalWidth = 0;
     private ArrayList<Pair<Integer, TextView>> mMeasureOrderTextViews = new ArrayList<>();
     private ArrayList<View> mMeasureOrderOther = new ArrayList<>();
@@ -45,7 +49,20 @@
     private Drawable mDefaultBackground;
 
     public NotificationActionListLayout(Context context, AttributeSet attrs) {
-        super(context, attrs);
+        this(context, attrs, 0);
+    }
+
+    public NotificationActionListLayout(Context context, AttributeSet attrs, int defStyleAttr) {
+        this(context, attrs, defStyleAttr, 0);
+    }
+
+    public NotificationActionListLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+
+        int[] attrIds = { android.R.attr.gravity };
+        TypedArray ta = context.obtainStyledAttributes(attrs, attrIds, defStyleAttr, defStyleRes);
+        mGravity = ta.getInt(0, 0);
+        ta.recycle();
     }
 
     @Override
@@ -95,6 +112,7 @@
 
         final boolean constrained =
                 MeasureSpec.getMode(widthMeasureSpec) != MeasureSpec.UNSPECIFIED;
+        final boolean centerAligned = (mGravity & Gravity.CENTER_HORIZONTAL) != 0;
 
         final int innerWidth = MeasureSpec.getSize(widthMeasureSpec) - mPaddingLeft - mPaddingRight;
         final int otherSize = mMeasureOrderOther.size();
@@ -137,7 +155,7 @@
 
         // Make sure to measure the last child full-width if we didn't use up the entire width,
         // or we didn't measure yet because there's just one child.
-        if (lastNotGoneChild != null && (constrained && usedWidth < innerWidth
+        if (lastNotGoneChild != null && !centerAligned && (constrained && usedWidth < innerWidth
                 || notGoneChildren == 1)) {
             MarginLayoutParams lp = (MarginLayoutParams) lastNotGoneChild.getLayoutParams();
             if (notGoneChildren > 1) {
@@ -201,9 +219,10 @@
         }
         final boolean isLayoutRtl = isLayoutRtl();
         final int paddingTop = mPaddingTop;
+        final boolean centerAligned = (mGravity & Gravity.CENTER_HORIZONTAL) != 0;
 
         int childTop;
-        int childLeft;
+        int childLeft = centerAligned ? left + (right - left) / 2 - mTotalWidth / 2 : 0;
 
         // Where bottom of child should go
         final int height = bottom - top;
@@ -216,13 +235,12 @@
         final int layoutDirection = getLayoutDirection();
         switch (Gravity.getAbsoluteGravity(Gravity.START, layoutDirection)) {
             case Gravity.RIGHT:
-                // mTotalWidth contains the padding already
-                childLeft = mPaddingLeft + right - left - mTotalWidth;
+                childLeft += mPaddingLeft + right - left - mTotalWidth;
                 break;
 
             case Gravity.LEFT:
             default:
-                childLeft = mPaddingLeft;
+                childLeft += mPaddingLeft;
                 break;
         }
 
diff --git a/core/res/res/layout/notification_template_header.xml b/core/res/res/layout/notification_template_header.xml
index f0c980c..3a28f4d 100644
--- a/core/res/res/layout/notification_template_header.xml
+++ b/core/res/res/layout/notification_template_header.xml
@@ -37,6 +37,7 @@
         android:textAppearance="?attr/notificationHeaderTextAppearance"
         android:layout_marginStart="@dimen/notification_header_app_name_margin_start"
         android:layout_marginEnd="@dimen/notification_header_separating_margin"
+        android:visibility="?attr/notificationHeaderAppNameVisibility"
         android:singleLine="true"
         />
     <TextView
diff --git a/core/res/res/layout/notification_template_material_ambient.xml b/core/res/res/layout/notification_template_material_ambient.xml
index ee5c758..865685f 100644
--- a/core/res/res/layout/notification_template_material_ambient.xml
+++ b/core/res/res/layout/notification_template_material_ambient.xml
@@ -23,8 +23,8 @@
     android:paddingStart="@dimen/notification_extra_margin_ambient"
     android:paddingEnd="@dimen/notification_extra_margin_ambient"
     >
-    <include layout="@layout/notification_template_header"
-        android:theme="@style/Theme.Material.Notification.Ambient" />
+    <include layout="@layout/notification_template_ambient_header"
+             android:theme="@style/Theme.Material.Notification.Ambient" />
 
     <LinearLayout
             android:id="@+id/notification_action_list_margin_target"
@@ -53,6 +53,7 @@
                 android:textAppearance="@style/TextAppearance.Material.Notification.Title"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
+                android:gravity="top|center_horizontal"
                 android:singleLine="true"
                 android:ellipsize="marquee"
                 android:fadingEdge="horizontal"
@@ -65,7 +66,7 @@
                 android:textAppearance="@style/TextAppearance.Material.Notification"
                 android:singleLine="false"
                 android:layout_weight="1"
-                android:gravity="top"
+                android:gravity="top|center_horizontal"
                 android:visibility="gone"
                 android:textSize="16sp"
                 android:textColor="#eeffffff"
@@ -75,5 +76,19 @@
             />
         </LinearLayout>
     </LinearLayout>
-    <include layout="@layout/notification_material_action_list" />
+    <FrameLayout android:id="@+id/actions_container"
+                 android:layout_width="match_parent"
+                 android:layout_height="wrap_content"
+                 android:layout_gravity="bottom">
+        <com.android.internal.widget.NotificationActionListLayout
+            android:id="@+id/actions"
+            android:layout_width="match_parent"
+            android:layout_height="@dimen/notification_action_list_height"
+            android:paddingEnd="4dp"
+            android:orientation="horizontal"
+            android:gravity="center"
+            android:visibility="gone"
+            android:background="@color/notification_action_list"
+        />
+    </FrameLayout>
 </FrameLayout>
diff --git a/core/res/res/values/attrs.xml b/core/res/res/values/attrs.xml
index 5e8e809..0eefec9 100644
--- a/core/res/res/values/attrs.xml
+++ b/core/res/res/values/attrs.xml
@@ -8715,6 +8715,14 @@
         <attr name="notificationHeaderStyle" format="reference" />
         <attr name="notificationHeaderTextAppearance" format="reference" />
         <attr name="notificationHeaderIconSize" format="dimension" />
+        <attr name="notificationHeaderAppNameVisibility" format="enum">
+            <!-- Visible on screen; the default value. -->
+            <enum name="visible" value="0" />
+            <!-- Not displayed, but taken into account during layout (space is left for it). -->
+            <enum name="invisible" value="1" />
+            <!-- Completely hidden, as if the view had not been added. -->
+            <enum name="gone" value="2" />
+        </attr>
     </declare-styleable>
 
     <attr name="lockPatternStyle" format="reference" />
diff --git a/core/res/res/values/styles_material.xml b/core/res/res/values/styles_material.xml
index 470ac52..cddf99a 100644
--- a/core/res/res/values/styles_material.xml
+++ b/core/res/res/values/styles_material.xml
@@ -1296,6 +1296,11 @@
         <item name="layout_marginBottom">@dimen/notification_header_margin_bottom</item>
         <item name="paddingStart">@dimen/notification_content_margin_start</item>
         <item name="paddingEnd">16dp</item>
+        <item name="gravity">top</item>
+    </style>
+
+    <style name="Notification.Header.Ambient">
+        <item name="gravity">top|center_horizontal</item>
     </style>
 
 </resources>
diff --git a/core/res/res/values/themes_material.xml b/core/res/res/values/themes_material.xml
index 9f858c8..c317121 100644
--- a/core/res/res/values/themes_material.xml
+++ b/core/res/res/values/themes_material.xml
@@ -1327,12 +1327,15 @@
     <style name="Theme.Material.Notification" parent="">
         <item name="notificationHeaderStyle">@style/Notification.Header</item>
         <item name="notificationHeaderTextAppearance">@style/TextAppearance.Material.Notification.Info</item>
+        <item name="notificationHeaderAppNameVisibility">visible</item>
         <item name="notificationHeaderIconSize">@dimen/notification_header_icon_size</item>
     </style>
 
     <!-- Theme for inflating ambient notification -->
     <style name="Theme.Material.Notification.Ambient">
+        <item name="notificationHeaderStyle">@style/Notification.Header.Ambient</item>
         <item name="notificationHeaderTextAppearance">@style/TextAppearance.Material.Notification.Info.Ambient</item>
+        <item name="notificationHeaderAppNameVisibility">gone</item>
         <item name="notificationHeaderIconSize">@dimen/notification_header_icon_size_ambient</item>
     </style>