Android9:Car AutoMotive系统(Carservice 服务)开机流程
目的:学习并记录Android原生Car 系统。
启动流程:
(1)SystemServer.java 启动CarServiceHelperService服务
frameworks/base/services/java/com/android/server/SystemServer.java
private static final String CAR_SERVICE_HELPER_SERVICE_CLASS =
"com.android.internal.car.CarServiceHelperService";
public static void main(String[] args) {
new SystemServer().run();
}
private void run() {
startOtherServices();
}
private void startOtherServices() {
if(mPackageManager.hasSystemFeature(PackageManager.FEATURE_AUTOMOTIVE)) {
traceBeginAndSlog("StartCarServiceHelperService");
mSystemServiceManager.startService(CAR_SERVICE_HELPER_SERVICE_CLASS);
traceEnd();
}
}
(2)CarServiceHelperService.java ,绑定carservice服务 /frameworks/opt/car/services/src/com/android/internal/car/CarServiceHelperService.java
private final ServiceConnection mCarServiceConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
Slog.i(TAG, "**CarService connected**");
mCarService = iBinder;
// Cannot depend on ICar which is defined in CarService, so handle binder call directly
// instead.
// void setCarServiceHelper(in IBinder helper)
Parcel data = Parcel.obtain();
data.writeInterfaceToken(CAR_SERVICE_INTERFACE);
data.writeStrongBinder(mHelper.asBinder());
try {
mCarService.transact(IBinder.FIRST_CALL_TRANSACTION, // setCarServiceHelper
data, null, Binder.FLAG_ONEWAY);
} catch (RemoteException e) {
Slog.w(TAG, "RemoteException from car service", e);
handleCarServiceCrash();
}
}
@Override
public void onServiceDisconnected(ComponentName componentName) {
handleCarServiceCrash();
}
};
@Override
public void onStart() {
Intent intent = new Intent();
//packages/services/Car/service/src/com/android/car/CarService.java
//包名为com.android.car
intent.setPackage("com.android.car");
intent.setAction(CAR_SERVICE_INTERFACE);
Slog.wtf(TAG, "liliadd:will start car service");
if (!getContext().bindServiceAsUser(intent, mCarServiceConnection, Context.BIND_AUTO_CREATE,
UserHandle.SYSTEM)) {
Slog.wtf(TAG, "cannot start car service");
}
System.loadLibrary("car-framework-service-jni");
}
(3)CarService.java ,创建ICarImpl实例,并调用init方法。
packages/services/Car/service/src/com/android/car/CarService.java
@Override
public void onCreate() {
mICarImpl = new ICarImpl(this,
mVehicle,
SystemInterface.Builder.defaultSystemInterface(this).build(),
mCanBusErrorNotifier,
mVehicleInterfaceName);
mICarImpl.init();
}
(4)ICarImpl.java 构造函数中启动服务。并对服务初始化
/packages/services/Car/service/src/com/android/car/ICarImpl.java
@MainThread
void init() {
traceBegin("VehicleHal.init");
mHal.init();
traceEnd();
traceBegin("CarService.initAllServices");
for (CarServiceBase service : mAllServices) {
service.init();
}
traceEnd();
}
调用对应服务得init方法。
注意:
1、CarService本质上是一个特殊的APP,它编译后生成CarService.apk;在真机上,它是在/system/priv-app/CarService/CarService.apk这里。
2、packages/services/Car/car_product/build/car.mk里面决定了是否编译相关apk。
参考文档:
https://blog.csdn.net/qilu0882/article/details/84990164
整理Android9 Car AutoMotive得启动流程。
本文地址:https://blog.csdn.net/zhuowalun8427/article/details/107190026