常熟网站设计,欧赛科技网站建设,wordpress同步百度,wordpress 4.5.3 ueditor2.2. IME管理端#xff08;IMMS#xff09;初始化流程
IMMS运行在system server进程中#xff0c;属于系统服务的一部分#xff0c;用于控制输入法的显示/隐藏、切换、绑定等操作。 涉及代码文件路径#xff1a; IMMS运行在system server进程中#xff0c;属于系统服务的…2.2. IME管理端IMMS初始化流程
IMMS运行在system server进程中属于系统服务的一部分用于控制输入法的显示/隐藏、切换、绑定等操作。 涉及代码文件路径 IMMS运行在system server进程中属于系统服务的一部分用于控制输入法的显示/隐藏、切换、绑定等操作。 涉及代码文件路径 frameworks/base/services/java/com/android/server/SystemServer.java frameworks/base/services/core/java/com/android/server/SystemServiceManager.java frameworks/base/core/java/android/os/SystemService.java frameworks/base/services/core/java/com/android/server/inputmethod/InputMethodManagerService.java frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java frameworks/base/packages/SettingsProvider/res/values/defaults.xml 2.2.1. 初始化函数流程梳理
# 我们从systemserver的startOtherServices函数开始梳理
# 此处需要注意因为我梳理的是IMMS而Google还提供了一个MultiClientInputMethodManagerService多客户端输入法服务进程此处不梳理
# PS从InputMethodManagerService代码文件中可以看到Lifecycle是里面的一个内部类继承systemservice
SystemServer.java -- startOtherServices然后通过SystemServiceManager的startService启动IMMS传入class nameInputMethodManagerService.Lifecycle.class--- SystemServiceManager.java -- startService有好几个重载的方法说明下1第一个startService方法入参className即InputMethodManagerService.Lifecycle.class将其作为入参调用loadClassFromLoader2loadClassFromLoader会通过反射方法得到具体的Class类返回ClassSystemService类型的服务类即继承SystemService的Lifecycle3调用第二个startService方法入参即serviceClass4先通过SystemService.class.isAssignableFrom(serviceClass)判断该类是否是SysteService的子类5然后通过反射构造类的实例serviceconstructor.newInstance(mContext)即实例化Lifecycle类重点6调用第三个startService方法入参该Lifecycle对象2先将该service添加到mServices列表中然后调用SystemService.java的onStart函数--- InputMethodManagerService.java -- 通过上面的流程看到此处会先调用Lifecycle类的构造函数然后调用onStart函数1构造函数会创建IMMS实例即InputMethodManagerService mServicenew InputMethodManagerService(context)2onStart函数会将该mService通过publishBinderService方法发布到系统服务中以便其他进行可以进行Binder获取到即添加到dev/binder域管理# 主要讲述IMMS对象被创建从构造函数梳理---》 调用构造函数主要用于注册一些监听事件, 获取必须的系统服务, UI相关的组件等
PS
SystemService启动输入法服务时会有个判断启动IMMS还是MCIMMS。MULTI_CLIENT_IME_ENABLED即persist.debug.multi_client_ime或ro.sys.multi_client_ime开启启动MultiClientInputMethodManagerService服务否则启动InputMethodManagerService服务关于MultiClientInputMethodManagerService就是多会话输入法支持每屏幕焦点是启用此功能的前提。如果不支持则无法启用此功能。由于安全限制每屏幕焦点限制规定只有一小部分设备支持此功能。详细参考Google官方文档和源码 2.2.2. systemRunning函数流程梳理
# 我们从systemserver的startOtherServices函数开始梳理
# startBootPhase在服务startservice后执行该函数将service分段处理
# 例如此处IMMS在SystemService.PHASE_WAIT_FOR_SENSOR_SERVICE200和SystemService.PHASE_LOCK_SETTINGS_READY480之间
SystemServer.java -- startOtherServices然后通过SystemServiceManager的startBootPhase--- SystemServiceManager.java -- startBootPhase遍历两个分段之间的服务然后调用对应service的onBootPhase--- InputMethodManagerService.java -- 调用Lifecycle类的onBootPhase函数然后调用InputMethodManagerService的systemRunning函数主要内容1MyPackageMonitor内部类register注册监听安装包的变化包含安装卸载更新等2SettingsObserver注册监听当前用户的各种输入法相关的settingprovider变化例如默认输入法输入法列表输入法语言等3getSelectedInputMethod获取用户设置的输入法default_input_method此处是查询settings数据库的默认输入法frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java4buildInputMethodListLocked如果没有默认输入法则入参false该函数内容如下---》 查询输入法服务信息然后将信息储存到mMethodListmMethodMapmMyPackageMonitor中---》 调用chooseNewDefaultIMELocked选择一个新的输入法---》 updateInputMethodsFromSettingsLocked遍历所有输入法如果输入法存在被禁用的组件则重新启用调用setInputMethodLocked方法完成对输入法设置和输入法发生变化的广播ACTION_INPUT_METHOD_CHANGED的发送该函数中调用setInputMethodLocked
一般我们修改默认输入法packages/SettingsProvider/res/values/defaults.xml 数据库配置添加def_input_method和def_enable_input_methods然后frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java对应添加loadStringSetting加载引用DEFAULT_INPUT_METHOD和ENABLED_INPUT_METHODS 2.2.3. 代码详细说明
//SystemServer.java
private void startOtherServices(NonNull TimingsTraceAndSlog t) {......// Bring up services needed for UI.if (mFactoryTestMode ! FactoryTest.FACTORY_TEST_LOW_LEVEL) {t.traceBegin(StartInputMethodManagerLifecycle);if (InputMethodSystemProperty.MULTI_CLIENT_IME_ENABLED) {mSystemServiceManager.startService(MultiClientInputMethodManagerService.Lifecycle.class);} else {//启动IMMS服务mSystemServiceManager.startService(InputMethodManagerService.Lifecycle.class);}t.traceEnd();......}...
}//SystemServiceManager.java//第一个startService函数public SystemService startService(String className) {//调用loadClassFromLoaderfinal ClassSystemService serviceClass loadClassFromLoader(className,this.getClass().getClassLoader());return startService(serviceClass);}private static ClassSystemService loadClassFromLoader(String className,ClassLoader classLoader) {try {//通过反射方法得到具体的Class类返回ClassSystemService类型的服务类即继承SystemService的Lifecyclereturn (ClassSystemService) Class.forName(className, true, classLoader);} catch (ClassNotFoundException ex) {.......}}//第二个startService函数public T extends SystemService T startService(ClassT serviceClass) {try {final String name serviceClass.getName();Slog.i(TAG, Starting name);Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, StartService name);// 判断该class该类是否是SysteService的子类if (!SystemService.class.isAssignableFrom(serviceClass)) {throw new RuntimeException(Failed to create name : service must extend SystemService.class.getName());}final T service;try {//通过反射构造类的实例即实例化Lifecycle类ConstructorT constructor serviceClass.getConstructor(Context.class);//newInstance实例化service constructor.newInstance(mContext);} catch (InstantiationException ex) {throw new RuntimeException(Failed to create service name : service could not be instantiated, ex);} ............//调用第三个startServicestartService(service);return service;} finally {Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);}}//第三个startService函数public void startService(NonNull final SystemService service) {// Register it.将service注册到mServices列表中mServices.add(service);// Start it.long time SystemClock.elapsedRealtime();try {//调用该service的onStart函数service.onStart();} catch (RuntimeException ex) {throw new RuntimeException(Failed to start service service.getClass().getName() : onStart threw an exception, ex);}warnIfTooLong(SystemClock.elapsedRealtime() - time, service, onStart);}//InputMethodManagerService.javapublic static final class Lifecycle extends SystemService {private InputMethodManagerService mService;//实例化时调用构造函数public Lifecycle(Context context) {super(context);//创建InputMethodManagerService IMMS对象然后调用IMMS构造函数mService new InputMethodManagerService(context);}//在startService中调用到此处Overridepublic void onStart() {//将IMMS service添加到LocalServicesLocalServices.addService(InputMethodManagerInternal.class,new LocalServiceImpl(mService));//发布到系统服务中以便其他进行可以进行Binder获取到即添加到dev/binder域管理publishBinderService(Context.INPUT_METHOD_SERVICE, mService, false /*allowIsolated*/,DUMP_FLAG_PRIORITY_CRITICAL | DUMP_FLAG_PRIORITY_NORMAL | DUMP_FLAG_PROTO);}.......}public class InputMethodManagerService extends IInputMethodManager.Stubimplements ServiceConnection, Handler.Callback {....//IMMS构造函数public InputMethodManagerService(Context context) {mIPackageManager AppGlobals.getPackageManager();mContext context;mRes context.getResources();mHandler new Handler(this);// Note: SettingsObserver doesnt register observers in its constructor.// SettingsObserver类型用于监听来自设置的输入法配置, 比如默认输入法, 启用的输入法, 选择的输入法等mSettingsObserver new SettingsObserver(mHandler);mIWindowManager IWindowManager.Stub.asInterface(ServiceManager.getService(Context.WINDOW_SERVICE));mWindowManagerInternal LocalServices.getService(WindowManagerInternal.class);mPackageManagerInternal LocalServices.getService(PackageManagerInternal.class);mInputManagerInternal LocalServices.getService(InputManagerInternal.class);mImeDisplayValidator displayId - mWindowManagerInternal.getDisplayImePolicy(displayId);.....// 状态栏输入法图标名称, 会根据这个名称设置输入法的图标显示mSlotIme mContext.getString(com.android.internal.R.string.status_bar_ime);mIsLowRam ActivityManager.isLowRamDeviceStatic();// 切换输入法时的通知Bundle extras new Bundle();extras.putBoolean(Notification.EXTRA_ALLOW_DURING_SETUP, true);.....//获取UIDint userId 0;try {userId ActivityManager.getService().getCurrentUser().id;} catch (RemoteException e) {Slog.w(TAG, Couldnt get current user ID; guessing its 0, e);}// 最近切换的UIDmLastSwitchUserId userId;//应在buildInputMethodListLocked之前创建mSettings//类型InputMethodSettings输入法设置对象mSettings new InputMethodSettings(mRes, context.getContentResolver(), mMethodMap, userId, !mSystemReady);updateCurrentProfileIds();AdditionalSubtypeUtils.load(mAdditionalSubtypeMap, userId);mSwitchingController InputMethodSubtypeSwitchingController.createInstanceLocked(mSettings, context);mMenuController new InputMethodMenuController(this);}......}
IMMS.java中几个重要的变量
String mCurMethodId系统当前默认的输入法id, 可能为空, 与Settings.Secure#DEFAULT_INPUT_METHOD值保持一致在setInputMethodLocked中赋值String mCurId当前已经绑定的输入法id, 如果没有输入法绑定上的话, 值为nullClientState mCurClient用于当前激活的IME, 只有持有这个令牌的IME才被系统认可IInputMethod mCurMethod当前已经绑定的输入法接口, 如果为null, 说明没有任何输入法连接上
