Android P WMS addwindow流程
16lz
2021-01-23
Android P WMS简介
Android P WMS初始化过程
Android P WMS addwindow流程
Android P WMS removewindow流程
Android P WMS relayoutWindow流程
Android P WMS windowanimator
Android P WMS Surface
Android P WMS 问题种类和debug分析技巧
Android P WMS View System 简介
1.APP启动addWindow过程
我们在WMS addWindow添加打印堆栈log
- //在WMS添加如下堆栈
- @WindowManagerService. java
- public int addWindow (Session session, IWindow client, int seq,
- LayoutParams attrs, int viewVisibility, int displayId, Rect outFrame,
- Rect outContentInsets, Rect outStableInsets, Rect outOutsets,
- DisplayCutout.ParcelableWrapper outDisplayCutout, InputChannel outInputChannel) {
-
- new Exception( "William WindowManagerService stack").printStackTrace(); //add log
然后在launcher点击启动settings,log如下。第一次在启动splash screen时执行addWindow，来至于SplashScreenStartingData.createStartingSurface,第二次是启动settings主界面 com.android.settings/com.android.settings.Settings。这一部分可以参考：
Android悬浮窗TYPE_TOAST小结: 源码分析
Android解析WindowManager（三）Window的添加过程
-
- //发现启动settings时，会先启动Splash Screen(启动画面也叫欢迎页)
- 1077 1148 W System.err: java.lang.Exception: William WindowManagerService stack
- 1077 1148 W System.err: at com.android.server.wm.WindowManagerService.addWindow(WindowManagerService.java:1157)
- 1077 1148 W System.err: at com.android.server.wm.Session.addToDisplay(Session.java:205)
- 1077 1148 W System.err: at android.view.ViewRootImpl.setView(ViewRootImpl.java:771)
- 1077 1148 W System.err: at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:356)
- 1077 1148 W System.err: at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:93)
- 1077 1148 W System.err: at com.android.server.policy.PhoneWindowManager.addSplashScreen(PhoneWindowManager.java:3214)
- 1077 1148 W System.err: at com.android.server.wm.SplashScreenStartingData.createStartingSurface(SplashScreenStartingData.java:56)
- 1077 1148 W System.err: at com.android.server.wm.AppWindowContainerController$1.run(AppWindowContainerController.java:170)
- 1077 1148 W System.err: at android.os.Handler.handleCallback(Handler.java: 873)
- 1077 1148 W System.err: at android.os.Handler.dispatchMessage(Handler.java: 99)
- 1077 1148 W System.err: at android.os.Looper.loop(Looper.java: 193)
- 1077 1148 W System.err: at android.os.HandlerThread.run(HandlerThread.java: 65)
- 1077 1148 W System.err: at com.android.server.ServiceThread.run(ServiceThread.java: 44)
- 1077 1148 V WindowManager: Window Window{e56651a u0 Splash Screen com.android.settings} client=android.view.ViewRootImpl$W@f2667c5 token=AppWindowToken{ 4be29e3 token=Token{afc8e12 ActivityRecord{f88399d u0 com.android.settings/.Settings t7}}} (Token{afc8e12 ActivityRecord{f88399d u0 com.android.settings/.Settings t7}}) params={( 0, 0)(fillxfill) ty=APPLICATION_STARTING wanim= 0x10302f8
- 1077 1148 V WindowManager: Attaching Window{e56651a u0 Splash Screen com.android.settings} token=AppWindowToken{ 4be29e3 token=Token{afc8e12 ActivityRecord{f88399d u0 com.android.settings/.Settings t7}}}
- 1077 1148 V WindowManager: addWindow: New client android.view.ViewRootImpl$W@f2667c5: window=Window{e56651a u0 Splash Screen com.android.settings} Callers=com.android.server.wm.Session.addToDisplay: 205 android.view.ViewRootImpl.setView: 771 android.view.WindowManagerGlobal.addView: 356 android.view.WindowManagerImpl.addView: 93 com.android.server.policy.PhoneWindowManager.addSplashScreen: 3214
-
-
- //然后才 add settings window(com.android.settings/com.android.settings.Settings)
- 1077 1236 W System.err: java.lang.Exception: William WindowManagerService stack
- 1077 1236 W System.err: at com.android.server.wm.WindowManagerService.addWindow(WindowManagerService.java: 1157)
- 1077 1236 W System.err: at com.android.server.wm.Session.addToDisplay(Session.java: 205)
- 1077 1236 W System.err: at android.view.IWindowSession$Stub.onTransact(IWindowSession.java: 129)
- 1077 1236 W System.err: at com.android.server.wm.Session.onTransact(Session.java: 164)
- 1077 1236 V WindowManager: Window Window{c70e488 u0 com.android.settings/com.android.settings.Settings} client=android.os.BinderProxy@d12a82b token=AppWindowToken{ 4be29e3 token=Token{afc8e12 ActivityRecord{f88399d u0 com.android.settings/.Settings t7}}} (Token{afc8e12 ActivityRecord{f88399d u0 com.android.settings/.Settings t7}}) params={( 0, 0)(fillxfill) sim={forwardNavigation} ty=BASE_APPLICATION wanim= 0x10302f8
- 1077 1236 V WindowManager: Attaching Window{c70e488 u0 com.android.settings/com.android.settings.Settings} token=AppWindowToken{ 4be29e3 token=Token{afc8e12 ActivityRecord{f88399d u0 com.android.settings/.Settings t7}}}
- 1077 1236 V WindowManager: First window added to Session{d84ba9c 3168: 1000}, creating SurfaceSession
- 1077 1236 V WindowManager: addWindow: New client android.os.BinderProxy@d12a82b: window=Window{c70e488 u0 com.android.settings/com.android.settings.Settings} Callers=com.android.server.wm.Session.addToDisplay: 205 android.view.IWindowSession$Stub.onTransact: 129 com.android.server.wm.Session.onTransact: 164 android.os.Binder.execTransact: 731
of call stack>
Android解析WindowManager（三）Window的添加过程
1.0 概述
WindowManager对Window进行管理，说到管理那就离不开对Window的添加、更新和删除的操作，在这里我们把它们统称为Window的操作。对于Window的操作，最终都是交由WMS来进行处理。窗口的操作分为两大部分，一部分是WindowManager处理部分，另一部分是WMS处理部分。我们知道Window分为三大类，分别是：Application Window（应用程序窗口）、Sub Windwow（子窗口）和System Window（系统窗口），对于不同类型的窗口添加过程会有所不同，但是对于WMS处理部分，添加的过程基本上是一样的， WMS对于这三大类的窗口基本是“一视同仁”的。
1.1 Activity的添加过程
- @frameworks/base/core/java/android/app/ActivityThread. java
- final void handleResumeActivity (IBinder token,
- boolean clearHide, boolean isForward, boolean reallyResume, int seq, String reason) {
- ...
- r = performResumeActivity(token, clearHide, reason); //1
- ...
- if (r.window == null && !a.mFinished && willBeVisible) {
- r.window = r.activity.getWindow();
- View decor = r.window.getDecorView();
- decor.setVisibility(View.INVISIBLE);
- ViewManager wm = a.getWindowManager(); //2
- WindowManager.LayoutParams l = r.window.getAttributes();
- a.mDecor = decor;
- l.type = WindowManager.LayoutParams.TYPE_BASE_APPLICATION;
- l.softInputMode |= forwardBit;
- if (r.mPreserveWindow) {
- a.mWindowAdded = true;
- r.mPreserveWindow = false;
- ViewRootImpl impl = decor.getViewRootImpl();
- if (impl != null) {
- impl.notifyChildRebuilt();
- }
- }
- if (a.mVisibleFromClient && !a.mWindowAdded) {
- a.mWindowAdded = true;
- wm.addView(decor, l); //3
- }
-
- }
注释1处的performResumeActivity方法最终会调用Activity的onResume方法。在注释2处得到ViewManager类型的wm对象，
在注释3处调用了wm的addView方法，而addView方法的实现则是在WindowManagerImpl中，此后的过程在上面的系统窗口的添加过程已经讲过，
唯一需要注意的是addView的第一个参数是DecorView。
1.2 系统窗口的添加过程
三大类窗口的添加过程会有所不同，这里以系统窗口StatusBar为例，StatusBar是SystemUI的重要组成部分，具体就是指系统状态栏，用于显示时间、电量和信号等信息。我们来查看StatusBar的实现类PhoneStatusBar的addStatusBarWindow方法，这个方法负责为StatusBar添加Window，如下所示。
- @/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar. java
- private void addStatusBarWindow () {
- makeStatusBarView();
- mStatusBarWindowManager = Dependency.get(StatusBarWindowManager.class);
- mRemoteInputController = new RemoteInputController(mHeadsUpManager);
- mStatusBarWindowManager.add(mStatusBarWindow, getStatusBarHeight());
- }
-
- @/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarWindowManager. java
- public void add (View statusBarView, int barHeight) {
-
- // Now that the status bar window encompasses the sliding panel and its
- // translucent backdrop, the entire thing is made TRANSLUCENT and is
- // hardware-accelerated.
- mLp = new WindowManager.LayoutParams(
- ViewGroup.LayoutParams.MATCH_PARENT,
- barHeight,
- WindowManager.LayoutParams.TYPE_STATUS_BAR,
- WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
- | WindowManager.LayoutParams.FLAG_TOUCHABLE_WHEN_WAKING
- | WindowManager.LayoutParams.FLAG_SPLIT_TOUCH
- | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH
- | WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS,
- PixelFormat.TRANSLUCENT);
- mLp.token = new Binder();
- mLp.flags |= WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED;
- mLp.gravity = Gravity.TOP;
- mLp.softInputMode = WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE;
- mLp.setTitle( "StatusBar");
- mLp.packageName = mContext.getPackageName();
- mStatusBarView = statusBarView;
- mBarHeight = barHeight;
- mWindowManager.addView(mStatusBarView, mLp); //mWindowManager
- mLpChanged = new WindowManager.LayoutParams();
- mLpChanged.copyFrom(mLp);
- }
-
- //WindowManager继承ViewManager，因此还是在ViewManager
- @frameworks/base/core/java/android/view/WindowManager.java
- /**
- * The interface that apps use to talk to the window manager.
- *
- @SystemService(Context.WINDOW_SERVICE)
- public interface WindowManager extends ViewManager {
-
-
- //包括addview update remove
- @/frameworks/base/core/java/android/view/ViewManager.java
- public interface ViewManager
- public void addView(View view, ViewGroup.LayoutParams params);
- public void updateViewLayout(View view, ViewGroup.LayoutParams params);
- public void removeView(View view);
- }
-
-
- //WindowManagerImpl具体实现addView
- public final class WindowManagerImpl implements WindowManager {
- private final WindowManagerGlobal mGlobal = WindowManagerGlobal.getInstance();
- @Override
- public void addView(@NonNull View view, @NonNull ViewGroup.LayoutParams params) {
- applyDefaultToken(params);
- mGlobal.addView(view, params, mContext.getDisplay(), mParentWindow);
- }
-
- @frameworks/base/core/java/android/view/WindowManagerGlobal.java
- public void addView(View view, ViewGroup.LayoutParams params,
- Display display, Window parentWindow) {
- ...//参数检查
- final WindowManager.LayoutParams wparams = (WindowManager.LayoutParams) params;
- if (parentWindow != null) {
- parentWindow.adjustLayoutParamsForSubWindow(wparams);//1
- } else {
- ...
- }
-
- ViewRootImpl root;
- View panelParentView = null;
- ...
- root = new ViewRootImpl(view.getContext(), display);//2
- view.setLayoutParams(wparams);
- mViews.add(view);
- mRoots.add(root);//3
- mParams.add(wparams);
- }
- try {
- root.setView(view, wparams, panelParentView);//4
- } catch (RuntimeException e) {
- ...
- }
- }
-
- /**
- * We have one child
- */
- public void setView(View view, WindowManager.LayoutParams attrs, View panelParentView) {
- synchronized ( this) {
- try {
- mOrigWindowType = mWindowAttributes.type;
- mAttachInfo.mRecomputeGlobalAttributes = true;
- collectViewAttributes();
- res = mWindowSession.addToDisplay(mWindow, mSeq, mWindowAttributes,
- getHostVisibility(), mDisplay.getDisplayId(),
- mAttachInfo.mContentInsets, mAttachInfo.mStableInsets,
- mAttachInfo.mOutsets, mInputChannel);
- }
- }
-
- @/frameworks/base/services/core/java/com/android/server/wm/Session. java
- public int addToDisplay (IWindow window, int seq, WindowManager.LayoutParams attrs,
- int viewVisibility, int displayId, Rect outContentInsets, Rect outStableInsets,
- Rect outOutsets, InputChannel outInputChannel) {
- return mService.addWindow( this, window, seq, attrs, viewVisibility, displayId, //就调用到了wms::addWindow
- outContentInsets, outStableInsets, outOutsets, outInputChannel);
- }
2.Window的添加过程（WMS部分）
frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java
- public int addWindow(Session session, IWindow client, int seq,
- WindowManager.LayoutParams attrs, int viewVisibility, int displayId,
- Rect outContentInsets, Rect outStableInsets, Rect outOutsets,
- InputChannel outInputChannel) {
-
- int[] appOp = new int[ 1];
- int res = mPolicy.checkAddPermission(attrs, appOp); //1
- if (res != WindowManagerGlobal.ADD_OKAY) {
- return res;
- }
- ...
- synchronized(mWindowMap) {
- if (!mDisplayReady) {
- throw new IllegalStateException( "Display has not been initialialized");
- }
- final DisplayContent displayContent = mRoot.getDisplayContentOrCreate(displayId); //2
- if (displayContent == null) {
- Slog.w(TAG_WM, "Attempted to add window to a display that does not exist: "
- + displayId + ". Aborting.");
- return WindowManagerGlobal.ADD_INVALID_DISPLAY;
- }
- ...
- if (type >= FIRST_SUB_WINDOW && type <= LAST_SUB_WINDOW) { //3
- parentWindow = windowForClientLocked( null, attrs.token, false); //4
- if (parentWindow == null) {
- Slog.w(TAG_WM, "Attempted to add window with token that is not a window: "
- + attrs.token + ". Aborting.");
- return WindowManagerGlobal.ADD_BAD_SUBWINDOW_TOKEN;
- }
- if (parentWindow.mAttrs.type >= FIRST_SUB_WINDOW
- && parentWindow.mAttrs.type <= LAST_SUB_WINDOW) {
- Slog.w(TAG_WM, "Attempted to add window with token that is a sub-window: "
- + attrs.token + ". Aborting.");
- return WindowManagerGlobal.ADD_BAD_SUBWINDOW_TOKEN;
- }
- }
- ...
- }
- ...
- }
WMS的addWindow返回的是addWindow的各种状态，比如添加Window成功，无效的display等等，这些状态被定义在WindowManagerGlobal中。
注释1处根据Window的属性，调用WMP的checkAddPermission方法来检查权限，具体的实现在PhoneWindowManager的checkAddPermission方法中，如果没有权限则不会执行后续的代码逻辑。注释2处通过displayId来获得窗口要添加到哪个DisplayContent上，如果没有找到DisplayContent，则返回WindowManagerGlobal.ADD_INVALID_DISPLAY这一状态，其中DisplayContent用来描述一块屏幕。注释3处，type代表一个窗口的类型，它的数值介于FIRST_SUB_WINDOW和LAST_SUB_WINDOW之间（1000~1999），这个数值定义在WindowManager中，说明这个窗口是一个子窗口，不了解窗口类型取值范围的请阅读Android解析WindowManager（二）Window的属性这篇文章。注释4处，attrs.token是IBinder类型的对象，windowForClientLocked方法内部会根据attrs.token作为key值从mWindowMap中得到该子窗口的父窗口。接着对父窗口进行判断，如果父窗口为null或者type的取值范围不正确则会返回错误的状态。
- ...
- AppWindowToken atoken = null;
- final boolean hasParent = parentWindow != null;
- WindowToken token = displayContent.getWindowToken(
- hasParent ? parentWindow.mAttrs.token : attrs.token); //1
- final int rootType = hasParent ? parentWindow.mAttrs.type : type; //2
- boolean addToastWindowRequiresToken = false;
-
- if (token == null) {
- if (rootType >= FIRST_APPLICATION_WINDOW && rootType <= LAST_APPLICATION_WINDOW) {
- Slog.w(TAG_WM, "Attempted to add application window with unknown token "
- + attrs.token + ". Aborting.");
- return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
- }
- if (rootType == TYPE_INPUT_METHOD) {
- Slog.w(TAG_WM, "Attempted to add input method window with unknown token "
- + attrs.token + ". Aborting.");
- return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
- }
- if (rootType == TYPE_VOICE_INTERACTION) {
- Slog.w(TAG_WM, "Attempted to add voice interaction window with unknown token "
- + attrs.token + ". Aborting.");
- return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
- }
- if (rootType == TYPE_WALLPAPER) {
- Slog.w(TAG_WM, "Attempted to add wallpaper window with unknown token "
- + attrs.token + ". Aborting.");
- return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
- }
- ...
- if (type == TYPE_TOAST) {
- // Apps targeting SDK above N MR1 cannot arbitrary add toast windows.
- if (doesAddToastWindowRequireToken(attrs.packageName, callingUid,
- parentWindow)) {
- Slog.w(TAG_WM, "Attempted to add a toast window with unknown token "
- + attrs.token + ". Aborting.");
- return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
- }
- }
- final IBinder binder = attrs.token != null ? attrs.token : client.asBinder();
- token = new WindowToken( this, binder, type, false, displayContent,
- session.mCanAddInternalSystemWindow); //3
- } else if (rootType >= FIRST_APPLICATION_WINDOW && rootType <= LAST_APPLICATION_WINDOW) { //4
- atoken = token.asAppWindowToken(); //5
- if (atoken == null) {
- Slog.w(TAG_WM, "Attempted to add window with non-application token "
- + token + ". Aborting.");
- return WindowManagerGlobal.ADD_NOT_APP_TOKEN;
- } else if (atoken.removed) {
- Slog.w(TAG_WM, "Attempted to add window with exiting application token "
- + token + ". Aborting.");
- return WindowManagerGlobal.ADD_APP_EXITING;
- }
- } else if (rootType == TYPE_INPUT_METHOD) {
- if (token.windowType != TYPE_INPUT_METHOD) {
- Slog.w(TAG_WM, "Attempted to add input method window with bad token "
- + attrs.token + ". Aborting.");
- return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
- }
- }
- ...
addWindow方法总结
addWindow方法分了3个部分来进行讲解，主要就是做了下面4件事：
1. 对所要添加的窗口进行检查，如果窗口不满足一些条件，就不会再执行下面的代码逻辑。
2. WindowToken相关的处理，比如有的窗口类型需要提供WindowToken，没有提供的话就不会执行下面的代码逻辑，有的窗口类型则需要由WMS隐式创建WindowToken。
3. WindowState的创建和相关处理，将WindowToken和WindowState相关联。
4. 创建和配置DisplayContent，完成窗口添加到系统前的准备工作。
参考链接：
Android悬浮窗TYPE_TOAST小结: 源码分析
Android解析WindowManagerService（二）WMS的重要成员和Window的添加过程
Android解析WindowManager系列
http://androidxref.com/9.0.0_r3/
《深入理解Android：卷III》
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