ServiceManager.java

最新推荐文章于 2024-11-23 19:57:04 发布

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最新推荐文章于 2024-11-23 19:57:04 发布

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分类专栏： Android开发

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本文介绍了Android系统中ServiceManager的核心功能，包括保存所有服务的Binder引用并提供服务的添加与查询接口。展示了ServiceManager在SystemServer启动过程中如何注册关键服务。

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位置: frameworks/base/core/java/android/os/ServiceManager.java

介绍：framework 核心类，保存所有service的 binder引用，提供service添加和查询接口。

主要接口：

public static void addService(String name, IBinder service) {
        try {
            getIServiceManager().addService(name, service, false);
        } catch (RemoteException e) {
            Log.e(TAG, "error in addService", e);
        }
    }

public static IBinder getService(String name) {
        try {
            IBinder service = sCache.get(name);
            if (service != null) {
                return service;
            } else {
                return getIServiceManager().getService(name);
            }
        } catch (RemoteException e) {
            Log.e(TAG, "error in getService", e);
        }
        return null;
    }

主要使用地方：

1. framework/base/services/java/com/android/server/SystemServer.java

private void startOtherServices() {

...

ServiceManager.addService("scheduling_policy", new SchedulingPolicyService());

ServiceManager.addService("telephony.registry", telephonyRegistry);

ServiceManager.addService("vibrator", vibrator);

ServiceManager.addService(Context.CONSUMER_IR_SERVICE, consumerIr);

ServiceManager.addService(Context.WINDOW_SERVICE, wm);
ServiceManager.addService(Context.INPUT_SERVICE, inputManager);

ServiceManager.addService(Context.ACCESSIBILITY_SERVICE,
new AccessibilityManagerService(context));

ServiceManager.addService(Context.STATUS_BAR_SERVICE, statusBar);

ServiceManager.addService(Context.CLIPBOARD_SERVICE,
new ClipboardService(context));

ServiceManager.addService(Context.NETWORKMANAGEMENT_SERVICE, networkManagement);

ServiceManager.addService(Context.NETWORK_SCORE_SERVICE, networkScore);

ServiceManager.addService(Context.NETWORK_STATS_SERVICE, networkStats);

ServiceManager.addService(Context.NETWORK_POLICY_SERVICE, networkPolicy);

ServiceManager.addService(Context.CONNECTIVITY_SERVICE, connectivity);

ServiceManager.addService(
Context.NSD_SERVICE, serviceDiscovery);

ServiceManager.addService(Context.UPDATE_LOCK_SERVICE,
new UpdateLockService(context));

ServiceManager.addService(Context.LOCATION_SERVICE, location);

ServiceManager.addService(Context.COUNTRY_DETECTOR, countryDetector);

ServiceManager.addService(Context.SEARCH_ENGINE_SERVICE,
new SearchEngineManagerService(context));

ServiceManager.addService(ISensorHubManager.SENSORHUB_SERVICE,
new SensorHubService(context));

ServiceManager.addService(Context.SERIAL_SERVICE, serial);

ServiceManager.addService(Context.HARDWARE_PROPERTIES_SERVICE,
hardwarePropertiesService);

ServiceManager.addService("diskstats", new DiskStatsService(context));

ServiceManager.addService("samplingprofiler",
new SamplingProfilerService(context));

ServiceManager.addService("network_time_update_service", networkTimeUpdater);

ServiceManager.addService("commontime_management", commonTimeMgmtService);

ServiceManager.addService(AssetAtlasService.ASSET_ATLAS_SERVICE, atlas);

ServiceManager.addService(GraphicsStatsService.GRAPHICS_STATS_SERVICE,
new GraphicsStatsService(context));

ServiceManager.addService(Context.MEDIA_ROUTER_SERVICE, mediaRouter);

...

}

private void startBootstrapServices() {

...

// Start the package manager.
traceBeginAndSlog("StartPackageManagerService");
mPackageManagerService = PackageManagerService.main(mSystemContext, installer,
mFactoryTestMode != FactoryTest.FACTORY_TEST_OFF, mOnlyCore);
mFirstBoot = mPackageManagerService.isFirstBoot();

// Set up the Application instance for the system process and get started.

...
mActivityManagerService.setSystemProcess();

...

}

...

2. frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java

public void setSystemProcess() {
        try {
            ServiceManager.addService(Context.ACTIVITY_SERVICE, this, true);
            ServiceManager.addService(ProcessStats.SERVICE_NAME, mProcessStats);
            ServiceManager.addService("meminfo", new MemBinder(this));
            ServiceManager.addService("gfxinfo", new GraphicsBinder(this));
            ServiceManager.addService("dbinfo", new DbBinder(this));
            if (MONITOR_CPU_USAGE) {
                ServiceManager.addService("cpuinfo", new CpuBinder(this));
            }
            ServiceManager.addService("permission", new PermissionController(this));
            ServiceManager.addService("processinfo", new ProcessInfoService(this));

            /// M: ANRManager mechanism @{
            ServiceManager.addService("anrmanager", mANRManager, true);
            /// @}
........
}

3. frameworks/base/services/core/java/com/android/server/pm/PackageManagerService.java

public static PackageManagerService main(Context context, Installer installer,
            boolean factoryTest, boolean onlyCore) {
        // Self-check for initial settings.
        PackageManagerServiceCompilerMapping.checkProperties();

        PackageManagerService m = new PackageManagerService(context, installer,
                factoryTest, onlyCore);
        m.enableSystemUserPackages();
        ServiceManager.addService("package", m);
        return m;
    }