品牌宣传型网站有哪些,找工作 招聘附近8小时双休,小程序模板是什么意思,一个网站做局打水1 App
应用代码一般在开发者的项目目录下#xff0c;packages/apps/YourApp/#xff0c;比如app/src/main/java目录下
对于系统应用#xff0c;源代码可能位于packages/apps/目录下#xff0c;例如packages/apps/Settings。
用户安装的应用#xff08;从Google Play或其…1 App
应用代码一般在开发者的项目目录下packages/apps/YourApp/比如app/src/main/java目录下
对于系统应用源代码可能位于packages/apps/目录下例如packages/apps/Settings。
用户安装的应用从Google Play或其他来源安装的APK位于设备的/data/app/目录
系统应用预装应用位于/system/app/或/system/priv-app/目录
应用在Dalvik或ART虚拟机上运行 直接使用Framework服务
import android.myframeworkservice.IMyFrameworkService;
import android.os.ServiceManager;
import android.os.RemoteException;public class MyActivity extends Activity {private IMyFrameworkService mFrameworkService;Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mFrameworkService IMyFrameworkService.Stub.asInterface(ServiceManager.getService(myframeworkservice));if (mFrameworkService ! null) {try {mFrameworkService.myFrameworkMethod();} catch (RemoteException e) {e.printStackTrace();}}}
}2 Framework层
Framework服务的源代码主要位于frameworks/base/services/目录
Framework服务的代码编译后成为framework.jar和其他相关JAR文件位于设备的/system/framework/目录
Framework服务在system_server进程中运行。system_server是由Zygote进程启动的它包含了大部分系统服务如ActivityManagerService、PackageManagerService等。 首先增加aidl
// IMyFrameworkService.aidl
package android.myframeworkservice;interface IMyFrameworkService {void myFrameworkMethod();
}用Java实现
// MyFrameworkService.java
package com.android.server;import android.content.Context;
import android.hardware.myhal.IMyHalService;
import android.os.IBinder;
import android.os.RemoteException;
import android.util.Slog;
import android.myframeworkservice.IMyFrameworkService;
import android.os.ServiceManager;public class MyFrameworkService extends IMyFrameworkService.Stub {private static final String TAG MyFrameworkService;private final Context mContext;private final IMyHalService mHalService;public MyFrameworkService(Context context) {mContext context;mHalService IMyHalService.Stub.asInterface(ServiceManager.getService(myhalservice));}Overridepublic void myFrameworkMethod() throws RemoteException {if (mHalService ! null) {mHalService.myHalMethod();} else {Slog.e(TAG, HAL service not available);}}
}在system manager中注册
import com.android.server.MyFrameworkService;public class SystemServer {// Existing code...private void startOtherServices() {// Existing code...try {Slog.i(SystemServer, MyFrameworkService);ServiceManager.addService(myframeworkservice, new MyFrameworkService(context));} catch (Throwable e) {reportWtf(starting MyFrameworkService, e);}// Existing code...}// Existing code...
}3 HAL层
HAL服务的源代码通常位于hardware/interfaces/或vendor/目录
HAL模块通常以共享库.so文件的形式存在位于/vendor/lib/hw/或/system/lib/hw/目录中。 定义服务
package android.hardware.myhal;interface IMyHalService {void myHalMethod();
}实现HAL服务用C
// MyHalService.cpp
#include android/hardware/myhal/IMyHalService.h
#include hidl/LegacySupport.h
#include log/log.husing android::hardware::myhal::V1_0::IMyHalService;
using android::hardware::configureRpcThreadpool;
using android::hardware::joinRpcThreadpool;
using android::sp;struct MyHalService : public IMyHalService {Returnvoid myHalMethod() override {ALOGI(myHalMethod called);return Void();}
};int main() {configureRpcThreadpool(1, true /*callerWillJoin*/);android::spIMyHalService service new MyHalService();if (service-registerAsService() ! android::OK) {ALOGE(Failed to register MyHalService);return 1;}joinRpcThreadpool();return 0;
}其实HAL也可以不封成AIDL。直接使用JNI貌似也是可以的各有利弊。 例子
https://www.cnblogs.com/linhaostudy/p/12002068.html
