不花钱怎么做网站运营,可以做视频的一个网站,乐达淄博网站建设制作,涉及部署未备案网站Android WindowManagerService架构分析 WindowManagerService(以下简称WMS) 是Android的核心服务。WMS管理所有应用程序窗口(Window)的Create、Display、Update、Destory。 因为Android系统中只有一个WMS#xff08;运行在SystemServer进程#xff09;#xff0c;可以称其为…Android WindowManagerService架构分析 WindowManagerService(以下简称WMS) 是Android的核心服务。WMS管理所有应用程序窗口(Window)的Create、Display、Update、Destory。 因为Android系统中只有一个WMS运行在SystemServer进程可以称其为全局的WMS。其主要的任务有两个 全局的窗口管理 应用程序的显示(在屏幕上看到应用在WMS的协助下有序、有层次的输出给底层服务最终显示到物理屏幕上。 全局的事件管理派发 WMS为Android输入系统InputManagerService提供窗口相关信息让输入事件比如touch、homekey等等可派发给适合的应用窗口。 触摸屏主流Android设备都使用了出触控屏支持手势触控、多指触控。 鼠标android系统加入鼠标通过光标触发相应动作。 硬按键Home、back、menu等等功能按键。 WMS的客户端WindowManager WindowManager是WMS提供给使用者的API。Manager的命名方式遵循了Android通过的Service/Client框架的命名方法即 Service端XXXService 客户端APIXXXManager WindowManager封装了WMS提供的AIDL对象主要包括 IWindowManager.aidl官方注释为**“System private interface to the window manager.”**定义了WMS服务提供的能力接口。 //frameworks/base/core/java/android/view/IWindowManager.aidl/* ** Copyright 2006, The Android Open Source Project ** ** Licensed under the Apache License, Version 2.0 (the License); ** you may not use this file except in compliance with the License. ** You may obtain a copy of the License at ** ** http://www.apache.org/licenses/LICENSE-2.0 ** ** Unless required by applicable law or agreed to in writing, software ** distributed under the License is distributed on an AS IS BASIS, ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. ** See the License for the specific language governing permissions and ** limitations under the License. */package android.view;import com.android.internal.os.IResultReceiver; import com.android.internal.policy.IKeyguardDismissCallback; import com.android.internal.policy.IShortcutService;import android.app.IAssistDataReceiver; import android.content.res.CompatibilityInfo; import android.content.res.Configuration; import android.graphics.Bitmap; import android.graphics.GraphicBuffer; import android.graphics.Insets; import android.graphics.Point; import android.graphics.Rect; import android.graphics.Region; import android.os.Bundle; import android.os.IRemoteCallback; import android.os.ParcelFileDescriptor; import android.view.DisplayCutout; import android.view.IApplicationToken; import android.view.IAppTransitionAnimationSpecsFuture; import android.view.ICrossWindowBlurEnabledListener; import android.view.IDisplayWindowInsetsController; import android.view.IDisplayWindowListener; import android.view.IDisplayFoldListener; import android.view.IDisplayWindowRotationController; import android.view.IOnKeyguardExitResult; import android.view.IPinnedTaskListener; import android.view.IScrollCaptureResponseListener; import android.view.RemoteAnimationAdapter; import android.view.IRotationWatcher; import android.view.ISystemGestureExclusionListener; import android.view.IWallpaperVisibilityListener; import android.view.IWindow; import android.view.IWindowSession; import android.view.IWindowSessionCallback; import android.view.KeyEvent; import android.view.InputEvent; import android.view.InsetsState; import android.view.MagnificationSpec; import android.view.MotionEvent; import android.view.InputChannel; import android.view.InputDevice; import android.view.IInputFilter; import android.view.AppTransitionAnimationSpec; import android.view.WindowContentFrameStats; import android.view.WindowManager; import android.view.SurfaceControl; import android.view.displayhash.DisplayHash; import android.view.displayhash.VerifiedDisplayHash;/*** System private interface to the window manager.** {hide}*/ interface IWindowManager { // 省略 }IWindowSession.aidl官方注释为“System private per-application interface to the window manager.”同样定义WMS服务提供的能力接口。 //frameworks/base/core/java/android/view/IWindowSession.aidl /* //device/java/android/android/view/IWindowSession.aidl ** ** Copyright 2006, The Android Open Source Project ** ** Licensed under the Apache License, Version 2.0 (the License); ** you may not use this file except in compliance with the License. ** You may obtain a copy of the License at ** ** http://www.apache.org/licenses/LICENSE-2.0 ** ** Unless required by applicable law or agreed to in writing, software ** distributed under the License is distributed on an AS IS BASIS, ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. ** See the License for the specific language governing permissions and ** limitations under the License. */package android.view;import android.content.ClipData; import android.graphics.Point; import android.graphics.Rect; import android.graphics.Region; import android.os.Bundle; import android.os.RemoteCallback; import android.util.MergedConfiguration; import android.view.DisplayCutout; import android.view.InputChannel; import android.view.IWindow; import android.view.IWindowId; import android.view.MotionEvent; import android.view.WindowManager; import android.view.InsetsSourceControl; import android.view.InsetsState; import android.view.Surface; import android.view.SurfaceControl; import android.view.SurfaceControl.Transaction; import android.window.ClientWindowFrames;import java.util.List;/** * System private per-application interface to the window manager. * * {hide} */ interface IWindowSession { // 省略 }WindowManager常用的方法有三个addView、removeView、updateViewLayout分别对应添加窗口、移除窗口、更新窗口布局功能。 // 获取WindowManager对象 WindowManager mWindowManager (WindowManager) context.getSystemService(Context.WINDOW_SERVICE); // 构建布局 WindowManager.LayoutParams wmParams new WindowManager.LayoutParams(); wmParams.xxx xxx; // 添加窗口到wms mWindowManager.addView(xxxViewwmParams); // 更新窗口布局 mWindowManager.updateViewLayout(xxxView, xxxWmParams) // 从wms中移除窗口 mWindowmanager.remove(xxxView, wmParams);Android支持多Display多块物理屏或虚拟屏在多Display情况下可以指定WindowManager绑定的Display从而在指定的屏幕上显示内容。默认情况下WindowManager绑定到DefaultDisplay。 // 获取DisplayManager对象 DisplayManager mDisplayManager; mDisplayManager (DisplayManager) context.getSystemService(Context.DISPLAY_SERVICE);// 获取指定DisplayID的Display可以通过DisplayManager的getDisplays接口取得ID。 // 取得Display对象 Display display mDisplayManager.getDisplay(displayId); // 通过特定的Display创建Context Context displayContext mContext.createDisplayContext(display); // 获取特定Display的WindowManager对象 WindowManager displayWindowManager (WindowManager) displayContext.getSystemService(Context.WINDOW_SERVICE);WMS提供的主要方法源码分析 这里针对WMS提供的主要方法根据Android12源码进行分析。 获取WindowManager对象 在应用中可通过如下方法获取WindowManager对象。 // 获取WindowManager对象 WindowManager mWindowManager (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);调用context的getSystemService方法其实现在ContextImpl.java中。 //frameworks/base/core/java/android/app/ContextImpl.java Override public Object getSystemService(String name) {if (vmIncorrectContextUseEnabled()) {// Check incorrect Context usage.// 省略}return SystemServiceRegistry.getSystemService(this, name); }调用SystemServiceRegistry对象的getSystemService方法。name为window(Context.WINDOW_SERVICE对应的值 //frameworks/base/core/java/android/app/SystemServiceRegistry.java public static Object getSystemService(ContextImpl ctx, String name) {if (name null) {return null;}// 从SYSTEM_SERVICE_FETCHERS(map)中取的Key为Window的valuefinal ServiceFetcher? fetcher SYSTEM_SERVICE_FETCHERS.get(name);if (fetcher null) {if (sEnableServiceNotFoundWtf) {Slog.wtf(TAG, Unknown manager requested: name);}return null;}// 调用getService方法// CachedServiceFetcherT对应的getServicefinal Object ret fetcher.getService(ctx);if (sEnableServiceNotFoundWtf ret null) {// 省略return null;}return ret; }/*** Override this class when the system service constructor needs a* ContextImpl and should be cached and retained by that context.*/ static abstract class CachedServiceFetcherT implements ServiceFetcherT {private final int mCacheIndex;CachedServiceFetcher() {// Note this class must be instantiated only by the static initializer of the// outer class (SystemServiceRegistry), which already does the synchronization,// so bare access to sServiceCacheSize is okay here.mCacheIndex sServiceCacheSize;}OverrideSuppressWarnings(unchecked)public final T getService(ContextImpl ctx) {final Object[] cache ctx.mServiceCache;final int[] gates ctx.mServiceInitializationStateArray;boolean interrupted false;T ret null;for (;;) {boolean doInitialize false;synchronized (cache) {// Return it if we already have a cached instance.// 如果有缓存从缓存中取出来T service (T) cache[mCacheIndex];if (service ! null) {ret service;// 跳出循环直接返回break; // exit the for (;;)}// If we get here, theres no cached instance.// Grr... if gate is STATE_READY, then this means we initialized the service// once but someone cleared it.// We start over from STATE_UNINITIALIZED.// Similarly, if the previous attempt returned null, well retry again.if (gates[mCacheIndex] ContextImpl.STATE_READY|| gates[mCacheIndex] ContextImpl.STATE_NOT_FOUND) {gates[mCacheIndex] ContextImpl.STATE_UNINITIALIZED;}// Its possible for multiple threads to get here at the same time, so// use the gate to make sure only the first thread will call createService().// At this point, the gate must be either UNINITIALIZED or INITIALIZING.if (gates[mCacheIndex] ContextImpl.STATE_UNINITIALIZED) {doInitialize true;gates[mCacheIndex] ContextImpl.STATE_INITIALIZING;}}if (doInitialize) {// Only the first thread gets here.T service null;ServiceInitializationState int newState ContextImpl.STATE_NOT_FOUND;try {// This thread is the first one to get here. Instantiate the service// *without* the cache lock held.// 创建新的对象。对于Context.WINDOW_SERVICE创建的是WindowManagerImpl// 在SystemServiceRegistry初始化时注册了各个服务对应的代理对象感兴趣的可自行阅读源码。service createService(ctx);newState ContextImpl.STATE_READY;} catch (ServiceNotFoundException e) {onServiceNotFound(e);} finally {synchronized (cache) {cache[mCacheIndex] service;gates[mCacheIndex] newState;cache.notifyAll();}}ret service;break; // exit the for (;;)}// 省略}if (interrupted) {Thread.currentThread().interrupt();}return ret;}public abstract T createService(ContextImpl ctx) throws ServiceNotFoundException; }上面创建了WindowManagerImpl对象这个对象实现了 WindowManager接口类是WMS提供的客户端代理真正实现类。 //frameworks/base/core/java/android/view/WindowManagerImpl.java public final class WindowManagerImpl implements WindowManager {UnsupportedAppUsageprivate final WindowManagerGlobal mGlobal WindowManagerGlobal.getInstance();UiContextVisibleForTestingpublic final Context mContext;private final Window mParentWindow;/*** If {link LayoutParams#token} is {code null} and no parent window is specified, the value* of {link LayoutParams#token} will be overridden to {code mDefaultToken}.*/private IBinder mDefaultToken;/*** This token will be set to {link LayoutParams#mWindowContextToken} and used to receive* configuration changes from the server side.*/Nullableprivate final IBinder mWindowContextToken;public WindowManagerImpl(Context context) {this(context, null /* parentWindow */, null /* clientToken */);}private WindowManagerImpl(Context context, Window parentWindow,Nullable IBinder windowContextToken) {mContext context;mParentWindow parentWindow;mWindowContextToken windowContextToken;} }WindowManagerImpl构造时会调用WindowManagerGlobal单例类的getInstance方法。WindowManagerGlobal持有IWindowManager对象。所以对应一个进程来讲默认情况下只需要一个IWindowManager对象。 //frameworks/base/core/java/android/view/WindowManagerGlobal.javaprivate static IWindowManager sWindowManagerService;// 应用启动加载Activity时就会调用这个初始化。 UnsupportedAppUsage public static void initialize() {getWindowManagerService(); }UnsupportedAppUsage public static WindowManagerGlobal getInstance() {synchronized (WindowManagerGlobal.class) {if (sDefaultWindowManager null) {sDefaultWindowManager new WindowManagerGlobal();}return sDefaultWindowManager;} }UnsupportedAppUsage public static IWindowManager getWindowManagerService() {synchronized (WindowManagerGlobal.class) {if (sWindowManagerService null) {sWindowManagerService IWindowManager.Stub.asInterface(ServiceManager.getService(window));try {if (sWindowManagerService ! null) {ValueAnimator.setDurationScale(sWindowManagerService.getCurrentAnimatorScale());sUseBLASTAdapter sWindowManagerService.useBLAST();}} catch (RemoteException e) {throw e.rethrowFromSystemServer();}}return sWindowManagerService;} }综上getSystemService(Context.WINDOW_SERVICE)返回的实际上是WindowManagerImpl。WindowManagerImpl通过WindowManagerGlobal这个单例类获取IWindowManager。 WindowManager AddView 通过addView添加窗口到屏幕上例如 // 添加窗口到wms mWindowManager.addView(xxxViewwmParams);调用WindowManagerImpl的addView方法 Override public void addView(NonNull View view, NonNull ViewGroup.LayoutParams params) {applyTokens(params);mGlobal.addView(view, params, mContext.getDisplayNoVerify(), mParentWindow,mContext.getUserId()); }直接调用WindowManagerGlobal的addView方法在这个方法主要是创建了ViewRootImpl更新了mViews和mRoots等变量。然后调用了ViewRootImpl的setView方法。 public void addView(View view, ViewGroup.LayoutParams params,Display display, Window parentWindow, int userId) {// 省略ViewRootImpl root;View panelParentView null;synchronized (mLock) {// 创建ViewRoot// 一个Window对应一个ViewRootroot new ViewRootImpl(view.getContext(), display);view.setLayoutParams(wparams);// mDyingViews进程中所有要销毁的View// mViews进程中所有View// mRoots进程中所有ViewRootImplmViews.add(view);mRoots.add(root);mParams.add(wparams);// do this last because it fires off messages to start doing thingstry {root.setView(view, wparams, panelParentView, userId);} catch (RuntimeException e) {// BadTokenException or InvalidDisplayException, clean up.if (index 0) {removeViewLocked(index, true);}throw e;}} }ViewRootImpl的setView方法中通过IWindowSession调用了WMS的addToDisplayAsUser方法向WMS添加Window。WMS收到请求后后创建WindowState与客户端的Window 一对一对应。 /*** We have one child*/ public void setView(View view, WindowManager.LayoutParams attrs, View panelParentView,int userId) {synchronized (this) {if (mView null) {mView view;// 省略try {// 调用IWindowSession向WMS添加Windowres mWindowSession.addToDisplayAsUser(mWindow, mWindowAttributes,getHostVisibility(), mDisplay.getDisplayId(), userId,mInsetsController.getRequestedVisibility(), inputChannel, mTempInsets,mTempControls);} catch (RemoteException e) {mAdded false;mView null;mAttachInfo.mRootView null;mFallbackEventHandler.setView(null);unscheduleTraversals();setAccessibilityFocus(null, null);throw new RuntimeException(Adding window failed, e);} finally {if (restore) {attrs.restore();}}} }WMS架构 Window Window是一个窗口很多图形系统都会有Window这个概念。比如CEGUI天龙八部使用的UI系统将Window作为最小的渲染单位每个画面都是系列Window组成的二叉树。对于WMS来说Window是最终呈现给用户的一块显示容器是一系列View组成的一个画面。实现上Window是一个抽象类PhoneWindow是它的实现类。PhoneWindow对View进行管理。一个Activity对应一个PhoneWindowActivity启动时会创建与自身一一对应的PhoneWindow。Window是View的容器View是Window的表现内容。 WindowManager WMS的接口类继承ViewManager。用于给客户端管理窗口它的实现类是WindowManagerImpl InputManagerService 通过EventHub方式从系统的输入Device节点中读取Input事件。通过WMS的协助派发给适当的应用。 SurfaceFlinger 分配应用程序需要的图形缓冲区对系统整个图像窗口做Composition最终图形窗口更新显示到Display。 WMS的主要功能 Surface管理wms会为所有窗口分配Surface通过surfaceFlinger创建Surface。客户端向WMS添加窗口addView的过程实质上是WMS为其分配一块Surface的过程。一系列Surface通过WMS进行管理有序排布z-order。所以View是表象、Window载体、Surface是本质。窗口属性管理显示层次、size、posotion等等属性管理这些属性经过WMS的管理后最终反馈到SurfaceFlinger中。窗口动画进场、退场动画。输入中转WMS是窗口的管理者IMS通过EventHub输入的系统Input事件会经由WMS转发给恰当的应用窗口 WMS的启动 WMS在SystemServer的startOtherServices阶段启动。 WMS的构造方法 WMS添加窗口 通过调用WMS的addWindow添加窗口WMS在添加窗口过程中主要完成了以下内容 登记Window创建WindowStateWindowState与客户端的ViewRoot/View一一对应通过WindowState对象WMS可以通知到客户端的ViewRoot。创建完成后将WindowState加入到WindowMap中进行管理。设置DisplayContent一个屏幕对应一个DisplayContent将窗口与对应的DisplayContent进行绑定。申请Surface画布WMS向SurfaceFligner申请一块Window画布在SurfaceFlinger中是一个LayerSurface画布对应着一块内存fb bufferSurface画面申请成功后View上的内容才可能显示到屏幕上。 如果View没有通过WindowManager.addView添加到WMS之前View的onDraw是不会被调用的。View上绘制的内容与WMS无关应用端可以会用接口直接告知SurfaceFlinger进行重绘。针对描画来讲WMS只负责窗口的管理。 WMS与SurfaceFlinger的关系 如何调试WMS 可以通过以下几种方法调试WMS dumpsys windows: WMS提供了dump方式可以通过dumpsys查看wms内部状态。对比WMS的实现源码以进行相关问题调查。 //frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java private void doDump(FileDescriptor fd, PrintWriter pw, String[] args, boolean useProto){ }使用dumpsys window -h查看支持的命令WMS的LogTagTAG_WITH_CLASS_NAME可以让WMS以统一的Tag”WindowManager”输出。其配置在WindowManagerDebugConfig.java文件中。 // frameworks/base/services/core/java/com/android/server/wm/WindowManagerDebugConfig.java /*** Common class for the various debug {link android.util.Log} output configuration in the window* manager package.*/ public class WindowManagerDebugConfig {// All output logs in the window manager package use the {link #TAG_WM} string for tagging// their log output. This makes it easy to identify the origin of the log message when sifting// through a large amount of log output from multiple sources. However, it also makes trying// to figure-out the origin of a log message while debugging the window manager a little// painful. By setting this constant to true, log messages from the window manager package// will be tagged with their class names instead fot the generic tag.static final boolean TAG_WITH_CLASS_NAME false;// Default log tag for the window manager package.static final String TAG_WM WindowManager; }关于WMS的扩展探讨 大多数系统上WMS都是核心模块之一拥有良好人机交互是系统流行的基础。WMS虽然与描画系统有关联但其应属于AppFramework范畴。 考虑WMS其通用性设计应该包括几个方面 北向提供稳定的API接口提供窗口管理、层次管理、动画管理、输入管理等功能。应用通过北向接口可以申请一块用于上屏的画布。南向封装并适配底层描画系统。