问题点：
在systemserver.java中添加如下代码，向servicemanager进程中添加一个service
<span style="font-size:18px;"> try {Slog.i(TAG, "Hello Service");ServiceManager.addService("hello", new HelloService());// } catch (Throwable e) {Slog.e(TAG, "Failure starting Hello Service", e);} </span>servicemanager是BINDER的管理者，负责协调Android里的进程通信。这里添加的helloservice是一个硬件管理服务，运行在单独的进程里，如果APP想要使用这个服务就必须通过servicemanager查询和调用。
执行代码的时候出现了如下错误：
<span style="font-size:18px;"> E SELinux : avc: denied { add } for service=hello scontext=u:r:system_server:s0 tcontext=u:object_r:default_android_service:s0 tclass=service_managerE ServiceManager: add_service('hello',62) uid=1000 - PERMISSION DENIED</span>解决办法：
To file:
android-dev\external\sepolicy\service.te
Add:
type mytest_service, system_api_service, system_server_service, service_manager_type;
To file:
android-dev\external\sepolicy\service_contexts
Add:
mytestservice u:object_r:mytest_service:s0
where mytestservice your name service
我的hello 在\external\sepolicy\service.te 添加了：
<span style="font-size:18px;">type hello_service, system_api_service, system_server_service, service_manager_type;</span>添加
<span style="font-size:18px;">hello u:object_r:hello_service:s0</span>make -j32
就不会有
<span style="font-size:18px;">E ServiceManager: add_service('hello',62) uid=1000 - PERMISSION DENIED</span>