IWindow是很重要的官方介绍是API back to a client window that the Window Manager uses to inform it of interesting things happening.也就是说是是用于WMS回调客户端的当窗口有一些改变时WMS及时调用客户端接口让客户端窗口立即更新。IWindow.aidl - OpenGrok cross reference for /frameworks/base/core/java/android/view/IWindow.aidl/** * API back to a client window that the Window Manager uses to inform it of * interesting things happening. * * {hide} */ oneway interface IWindow { /** * NOTICE * The first method must remain the first method. Scripts * and tools rely on their transaction number to work properly. */ /** * Invoked by the view server to tell a window to execute the specified * command. Any response from the receiver must be sent through the * specified file descriptor. */ void executeCommand(String command, String parameters, in ParcelFileDescriptor descriptor); void resized(in ClientWindowFrames frames, boolean reportDraw, in MergedConfiguration newMergedConfiguration, in InsetsState insetsState, boolean forceLayout, boolean alwaysConsumeSystemBars, int displayId, int syncSeqId, boolean dragResizing); /** * Called when this window retrieved control over a specified set of insets sources. */ void insetsControlChanged(in InsetsState insetsState, in InsetsSourceControl[] activeControls); /** * Called when a set of insets source window should be shown by policy. * * param types internal insets types (WindowInsets.Type.InsetsType) to show * param fromIme true if this request originated from IME (InputMethodService). * param statsToken the token tracking the current IME show request or {code null} otherwise. */ void showInsets(int types, boolean fromIme, in nullable ImeTracker.Token statsToken); /** * Called when a set of insets source window should be hidden by policy. * * param types internal insets types (WindowInsets.Type.InsetsType) to hide * param fromIme true if this request originated from IME (InputMethodService). * param statsToken the token tracking the current IME hide request or {code null} otherwise. */ void hideInsets(int types, boolean fromIme, in nullable ImeTracker.Token statsToken); void moved(int newX, int newY); void dispatchAppVisibility(boolean visible); void dispatchGetNewSurface(); void closeSystemDialogs(String reason); /** * Called for wallpaper windows when their offsets or zoom level change. */ void dispatchWallpaperOffsets(float x, float y, float xStep, float yStep, float zoom, boolean sync); void dispatchWallpaperCommand(String action, int x, int y, int z, in Bundle extras, boolean sync); /** * Drag/drop events */ void dispatchDragEvent(in DragEvent event); /** * Pointer icon events */ void updatePointerIcon(float x, float y); /** * Called for non-application windows when the enter animation has completed. */ void dispatchWindowShown(); /** * Called when Keyboard Shortcuts are requested for the window. */ void requestAppKeyboardShortcuts(IResultReceiver receiver, int deviceId); /** * Called when Scroll Capture support is requested for a window. * * param callbacks to receive responses */ void requestScrollCapture(in IScrollCaptureResponseListener callbacks); }IWindow是怎么赋值并一步步传入WMS端的呢由下面代码可以看出它是在ViewRootImpl中进行赋值的//定义 final W mWindow; ... public ViewRootImpl(UiContext Context context, Display display, IWindowSession session, WindowLayout windowLayout) { ... mWindow new W(this); ... } W如下 static class W extends IWindow.Stub { private final WeakReferenceViewRootImpl mViewAncestor; private final IWindowSession mWindowSession; W(ViewRootImpl viewAncestor) { mViewAncestor new WeakReferenceViewRootImpl(viewAncestor); mWindowSession viewAncestor.mWindowSession; } ... public void setView(View view, WindowManager.LayoutParams attrs, View panelParentView, int userId) { //此时将mWindow传入这个方法会一步步调用到Server端WMS中 res mWindowSession.addToDisplayAsUser(mWindow, mWindowAttributes, getHostVisibility(), mDisplay.getDisplayId(), userId, mInsetsController.getRequestedVisibleTypes(), inputChannel, mTempInsets, mTempControls, attachedFrame, compatScale);