Automotive 添加一个特权APP

platform: android-13.0.0_r32

一. 添加一个自定义空调的app为例

路径：packages/apps/Car/MyHvac

app内容可以自己定义，目录结构如下：

1.1 Android.bp

package {default_applicable_licenses: ["Android-Apache-2.0"],
}android_app {# app的名字name: "MyHvac",# 源码srcs: ["src/**/*.java"],# 资源resource_dirs: ["res"],platform_apis: true,# platform 签名certificate: "platform",# 是否是特权appprivileged: true,# 依赖 car-liblibs: ["android.car-system-stubs"],  # 这是app的常用依赖static_libs: ["jsr305","androidx.legacy_legacy-support-v4","androidx.appcompat_appcompat","androidx-constraintlayout_constraintlayout","androidx.lifecycle_lifecycle-extensions","car-apps-common",],optimize: {enabled: false,},dex_preopt: {enabled: false,},product_variables: {pdk: {enabled: false,},},# 这里就是请求特权的模块信息了required: ["allowed_privapp_com.jiangc.myhvac"]
}

1.2 权限申请

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.jiangc.myhvac"><uses-sdkandroid:minSdkVersion="22"android:targetSdkVersion="31"/><uses-permission android:name="android.car.permission.CONTROL_CAR_CLIMATE" /><uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" /><!-- Required to use the TYPE_DISPLAY_OVERLAY layout param for the overlay hvac ui--><uses-permission android:name="android.permission.INTERNAL_SYSTEM_WINDOW" /><!-- Allow Hvac to go across all users--><uses-permission android:name="android.permission.INTERACT_ACROSS_USERS" /><uses-permission android:name="android.permission.INTERACT_ACROSS_USERS_FULL" /><protected-broadcast android:name="android.car.intent.action.TOGGLE_HVAC_CONTROLS" /><uses-featureandroid:name="android.hardware.type.automotive"android:required="true" /><applicationandroid:allowBackup="true"android:appCategory="audio"android:icon="@mipmap/ic_launcher"android:label="@string/app_name"android:roundIcon="@mipmap/ic_launcher_round"android:supportsRtl="true"android:theme="@style/Theme.MyHvac"><activityandroid:name=".MainActivity"android:exported="true"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity></application></manifest>

其中INTERACT_ACROSS_USERS、CONTROL_CAR_CLIMATE为特殊权限

二. 添加特权配置

路径：packages/services/Car/data/etc/

以包名创建一个xml文件，比如本例中的com.jiangc.myhvac.xml

内容如下：将特殊权限放到这里

<permissions><privapp-permissions package="com.jiangc.myhvac"><permission name="android.permission.INTERACT_ACROSS_USERS"/><permission name="android.car.permission.CONTROL_CAR_CLIMATE"/></privapp-permissions>
</permissions>

然后在Android.bp中添加一个模块

prebuilt_etc {# 模块名，和前面Android.bp中匹配name: "allowed_privapp_com.jiangc.myhvac",sub_dir: "permissions",# 这里是我们上面添加的特权文件名src: "com.jiangc.myhvac.xml",filename_from_src: true,
}

接下来修改packages/services/Car/car_product/overlay/frameworks/base/core/res/res/values/policy_exempt_apps.xml

添加应用的包名

<resources><!--A collection of apps that are critical for the device and hence will never be disabled bydevice policies or APIs.--><string-array translatable="false" name="policy_exempt_apps"><item>com.android.car.cluster.home</item><item>com.android.car.hvac</item><item>com.android.car.media</item><item>com.android.car.radio</item><item>com.jiangc.myhvac</item></string-array>
</resources>

然后make