java层调用cpp层的Binder

基于android 8 分析

以BatteryService里调用IBatteryPropertiesRegistrar为例

IBinder b = ServiceManager.getService("batteryproperties");

        final IBatteryPropertiesRegistrar batteryPropertiesRegistrar =

                IBatteryPropertiesRegistrar.Stub.asInterface(b);

batteryPropertiesRegistrar.registerListener(new BatteryListener());

1.BatteryService.java位于

android\frameworks\base\services\core\java\com\android\server

2. IBatteryPropertiesRegistrar 的定义

android\frameworks\native\services\batteryservice

实现在

android\system\core\healthd\BatteryPropertiesRegistrar.cpp

3. java和cpp层的定义需要对应

java层编译

frameworks/base/Android.mk:254: core/java/android/os/IBatteryPropertiesRegistrar.aidl

java 传递的参数如 BatteryProperty和 BatteryProperties 实现Parcelable接口

PS：Camera2的接口也是java调用cpp层的binder，实现在

\LA.UM.6.6\LINUX\android\frameworks\base\core\java\android\hardware\camera2\CameraManager.java