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本文主要通过SystemProperties系统属性和Settings.System存储数据库的状态进行判断，从而实现控制相机

/vendor/mediatek/proprietary/packages/apps/MtkSettings/res/values-zh-rCN/strings.xml

    <!--camera-->
    <string name="manager_camera_switch">摄像头功能管理</string>
    <string name="use_camera_switch">摄像头功能开关</string>
    <string name="use_camera_summary">打开:禁用\n关闭:可用</string>
    

overlay/vendor/mediatek/proprietary/packages/apps/MtkSettings/res/values/strings.xml

<add-resource type="string" name="manager_camera_switch"/>
    <add-resource type="string" name="use_camera_switch"/>
    <add-resource type="string" name="use_camera_summary"/>
    

  <!--camera-->
    <string name="manager_camera_switch">Manage camera functionality</string>
    <string name="use_camera_switch">Close Camera Switch</string>
    <string name="use_camera_summary">ON:Disable\nOFF:Available</string>

vendor/mediatek/proprietary/packages/apps/MtkSettings/res/xml/fradvanced_features_settings.xml 【这里可以是其他一级二级菜单管理下添加】

       <Preference
            android:key="camera_switch"
           android:icon="@drawable/ic_settings_splitscreen"
            android:title="@string/manager_camera_switch"
            >
            <intent android:action="com.freeme.intent.action.cameraswitch"/>
       </Preference>

===================================【通知跳转Java类加载进入子菜单】

/vendor/mediatek/proprietary/packages/apps/MtkSettings/res/xml/freeme_camera_switch.xml

<?xml version="1.0" encoding="UTF-8"?>

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
android:title="@string/manager_camera_switch"
>
    <SwitchPreference
        android:key="switch_preference"
        android:title="@string/use_camera_switch"
        android:summary="@string/use_camera_summary"/>
</PreferenceScreen>

/vendor/mediatek/proprietary/packages/apps/MtkSettings/AndroidManifest.xml

       <!--tyd.lxd,add camera switch--> 
          <activity
            android:name="com.android.settings.CameraSwitchSetting"
            android:configChanges="orientation|keyboardHidden|screenSize|mnc|mcc"
            android:excludeFromRecents="true"
            android:clearTaskOnLaunch="true"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent