Avoid some more layer creations

Bug: 17287256
Change-Id: I8c0c6f1f189b70d9a0c261f75987def3464d808d

packages/Keyguard/res/layout/keyguard_pin_view.xml

@@ -40,7 +40,7 @@
             android:layout_weight="1"
             android:layoutDirection="ltr"
             >
-        <RelativeLayout
+        <com.android.keyguard.AlphaOptimizedRelativeLayout
                 android:id="@+id/row0"
                 android:layout_width="match_parent"
                 android:layout_height="0dp"
@@ -79,7 +79,7 @@
                     android:layout_alignParentBottom="true"
                     android:background="#28FFFFFF"
                     />
-        </RelativeLayout>
+        </com.android.keyguard.AlphaOptimizedRelativeLayout>
         <LinearLayout
                 android:id="@+id/row1"
                 android:layout_width="match_parent"
@@ -196,7 +196,7 @@
                     androidprv:textView="@+id/pinEntry"
                     androidprv:digit="0"
                     />
-            <ImageButton
+            <com.android.keyguard.AlphaOptimizedImageButton
                     android:id="@+id/key_enter"
                     android:layout_width="0px"
                     android:layout_height="match_parent"

packages/Keyguard/src/com/android/keyguard/AlphaOptimizedImageButton.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package com.android.keyguard;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.widget.ImageButton;
+import android.widget.RelativeLayout;
+
+/**
+ * A frame layout which does not have overlapping renderings commands and therefore does not need a
+ * layer when alpha is changed.
+ */
+public class AlphaOptimizedImageButton extends ImageButton {
+
+    public AlphaOptimizedImageButton(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    public boolean hasOverlappingRendering() {
+        return false;
+    }
+}

packages/Keyguard/src/com/android/keyguard/AlphaOptimizedLinearLayout.java

@@ -14,7 +14,7 @@
  * limitations under the License
  */
 
-package com.android.systemui.statusbar;
+package com.android.keyguard;
 
 import android.content.Context;
 import android.util.AttributeSet;

packages/Keyguard/src/com/android/keyguard/AlphaOptimizedRelativeLayout.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package com.android.keyguard;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.widget.RelativeLayout;
+
+/**
+ * A frame layout which does not have overlapping renderings commands and therefore does not need a
+ * layer when alpha is changed.
+ */
+public class AlphaOptimizedRelativeLayout extends RelativeLayout {
+
+    public AlphaOptimizedRelativeLayout(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    public boolean hasOverlappingRendering() {
+        return false;
+    }
+}

packages/Keyguard/src/com/android/keyguard/EmergencyCarrierArea.java

@@ -17,13 +17,11 @@
 package com.android.keyguard;
 
 import android.content.Context;
-import android.content.res.TypedArray;
 import android.util.AttributeSet;
 import android.view.MotionEvent;
 import android.view.View;
-import android.widget.LinearLayout;
 
-public class EmergencyCarrierArea extends LinearLayout {
+public class EmergencyCarrierArea extends AlphaOptimizedLinearLayout {
 
     private CarrierText mCarrierText;
     private EmergencyButton mEmergencyButton;

packages/SystemUI/res/layout/keyguard_user_switcher.xml

@@ -14,7 +14,7 @@
   ~ See the License for the specific language governing permissions and
   ~ limitations under the License
   -->
-<com.android.systemui.statusbar.AlphaOptimizedLinearLayout
+<com.android.keyguard.AlphaOptimizedLinearLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
         android:id="@+id/keyguard_user_switcher"
         android:orientation="vertical"
@@ -23,4 +23,4 @@
         android:gravity="end"
         android:visibility="gone"
         android:paddingTop="4dp">
-</com.android.systemui.statusbar.AlphaOptimizedLinearLayout>
+</com.android.keyguard.AlphaOptimizedLinearLayout>

packages/SystemUI/res/layout/status_bar.xml

@@ -57,7 +57,7 @@
             >
             <!-- The alpha of this area is both controlled from PhoneStatusBarTransitions and
                  PhoneStatusBar (DISABLE_NOTIFICATION_ICONS), so we need two views here. -->
-            <com.android.systemui.statusbar.AlphaOptimizedLinearLayout
+            <com.android.keyguard.AlphaOptimizedLinearLayout
                 android:id="@+id/notification_icon_area_inner"
                 android:layout_width="match_parent"
                 android:layout_height="match_parent"
@@ -74,10 +74,10 @@
                     android:layout_alignParentStart="true"
                     android:gravity="center_vertical"
                     android:orientation="horizontal"/>
-            </com.android.systemui.statusbar.AlphaOptimizedLinearLayout>
+            </com.android.keyguard.AlphaOptimizedLinearLayout>
         </com.android.systemui.statusbar.AlphaOptimizedFrameLayout>
 
-        <com.android.systemui.statusbar.AlphaOptimizedLinearLayout android:id="@+id/system_icon_area"
+        <com.android.keyguard.AlphaOptimizedLinearLayout android:id="@+id/system_icon_area"
             android:layout_width="wrap_content"
             android:layout_height="match_parent"
             android:orientation="horizontal"
@@ -94,7 +94,7 @@
                 android:paddingStart="7dp"
                 android:gravity="center_vertical|start"
                 />
-        </com.android.systemui.statusbar.AlphaOptimizedLinearLayout>
+        </com.android.keyguard.AlphaOptimizedLinearLayout>
     </LinearLayout>
 
     <ViewStub

packages/SystemUI/res/layout/status_bar_expanded_header.xml

@@ -44,7 +44,7 @@
             android:scaleType="centerInside"/>
     </com.android.systemui.statusbar.phone.MultiUserSwitch>
 
-    <ImageButton android:id="@+id/settings_button"
+    <com.android.keyguard.AlphaOptimizedImageButton android:id="@+id/settings_button"
         style="@android:style/Widget.Material.Button.Borderless"
         android:layout_toStartOf="@id/multi_user_switch"
         android:layout_width="48dp"

packages/SystemUI/res/layout/system_icons.xml

@@ -20,7 +20,7 @@
     android:layout_height="match_parent"
     android:gravity="center_vertical">
 
-    <com.android.systemui.statusbar.AlphaOptimizedLinearLayout android:id="@+id/statusIcons"
+    <com.android.keyguard.AlphaOptimizedLinearLayout android:id="@+id/statusIcons"
         android:layout_width="wrap_content"
         android:layout_height="match_parent"
         android:gravity="center_vertical"