Camera拍照/录像按钮部分做透明处理

// vendor/mediatek/proprietary/packages/apps/Camera/res/layout-land/camera_shutter_photo_video.xml
 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/camera_shutter"
    style="@style/ShutterGroup"       //这里是问题的关键点
    android:splitMotionEvents="false">
    <com.android.camera.ui.ShutterButton
        android:id="@+id/shutter_button_photo"
        style="@style/ShutterButton"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:src="@drawable/btn_photo"
        android:contentDescription="@string/accessibility_shutter_button" />
    <ImageView style="@style/ShutterButtonSeperator"
        android:layout_height="1dp"
        android:layout_weight="0" />
       <com.android.camera.ui.ShutterButton
        android:id="@+id/shutter_button_video"
        style="@style/ShutterButton"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:src="@drawable/btn_video"
        android:contentDescription="@string/accessibility_video_shutter_button"/>
</LinearLayout>
 
//vendor/mediatek/proprietary/packages/apps/Camera/res/layout-port/camera_shutter_photo_video.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/camera_shutter"
    style="@style/ShutterGroup"      //这里是问题的关键点
    android:splitMotionEvents="false">
       <com.android.camera.ui.ShutterButton
        android:id="@+id/shutter_button_video"
        style="@style/ShutterButton"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:src="@drawable/btn_video"
        android:contentDescription="@string/accessibility_video_shutter_button"/>
    <ImageView style="@style/ShutterButtonSeperator"
        android:layout_width="1dp"
        android:layout_weight="0" />
    <com.android.camera.ui.ShutterButton
        android:id="@+id/shutter_button_photo"
        style="@style/ShutterButton"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:src="@drawable/btn_photo"
        android:contentDescription="@string/accessibility_shutter_button" />
</LinearLayout>

//vendor/mediatek/proprietary/packages/apps/Camera/res_ext/values-port/styles.xml
<style name="ShutterGroup" parent="ScreenMargin">
    <item name="android:layout_height">wrap_content</item>
    <item name="android:layout_width">wrap_content</item>
    <item name="android:layout_gravity">bottom|center_horizontal</item>
    <item name="android:gravity">center</item>
    <item name="android:background">@drawable/bg_shutter_background</item>  //这是问题的关键点
    <item name="android:orientation">horizontal</item>
</style>

//vendor/mediatek/proprietary/packages/apps/Camera/res_ext/values-land/styles.xml
<style name="ShutterGroup" parent="ScreenMargin">
    <item name="android:layout_height">wrap_content</item>
    <item name="android:layout_width">wrap_content</item>
    <item name="android:layout_gravity">right|center_vertical</item>
    <item name="android:gravity">center</item>
    <item name="android:background">@drawable/bg_shutter_background</item> //这是问题的关键点
    <item name="android:orientation">vertical</item>
</style>