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app
    privileged: true,
    # 依赖 car-lib
    libs: ["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-sdk
        android: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-feature
        android:name="android.hardware.type.automotive"
        android:required="true" />

    <application
        android: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">
        <activity
            android: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 by
    device 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