本文是基于android_9.0.0_r4
我们都知道Activity在AMS端的描述是ActivityRecord，ActivityRecord初始化过程会创建一个token对象，这个token对象会保存在三个位置：app端，ams,wms端，本文主要是分析这个token值从ams传递到wms的流程
Activity启动过程中有会执行到ActivityStatck的startActivityLocked方法中
ActivityStack.java::startActivityLocked
if (r.getWindowContainerController() == null) {
r.createWindowContainer();
}
其中r的数据类型是ActivityRecord
进入到ActivityRecord的createWindowContainer方法
ActivityRecord::createWindowContainer
if (mWindowContainerController != null) {
throw new IllegalArgumentException("Window container=" + mWindowContainerController
+ " already created for r=" + this);
}
inHistory = true;
final TaskWindowContainerController taskController = task.getWindowContainerController();
// TODO(b/36505427): Maybe this call should be moved inside updateOverrideConfiguration()
task.updateOverrideConfigurationFromLaunchBounds();
// Make sure override configuration is up-to-date before using to create window controller.
updateOverrideConfiguration();
mWindowContainerController = new AppWindowContainerController(taskController, appToken,
this, Integer.MAX_VALUE /* add on top */, info.screenOrientation, fullscreen,
(info.flags & FLAG_SHOW_FOR_ALL_USERS) != 0, info.configChanges,
task.voiceSession != null, mLaunchTaskBehind, isAlwaysFocusable(),
appInfo.targetSdkVersion, mRotationAnimationHint,
ActivityManagerService.getInputDispatchingTimeoutLocked(this) * 1000000L);
task.addActivityToTop(this);
// When an activity is started directly into a split-screen fullscreen stack, we need to
// update the initial multi-window modes so that the callbacks are scheduled correctly when
// the user leaves that mode.
mLastReportedMultiWindowMode = inMultiWindowMode();
mLastReportedPictureInPictureMode = inPinnedWindowingMode();
在该过程中会创建AppWindowContainerController对象，进入到AppWindowContainerController的构造方法中
public AppWindowContainerController(TaskWindowContainerController taskController,
IApplicationToken token, AppWindowContainerListener listener, int index,
int requestedOrientation, boolean fullscreen, boolean showForAllUsers, int configChanges,
boolean voiceInteraction, boolean launchTaskBehind, boolean alwaysFocusable,
int targetSdkVersion, int rotationAnimationHint, long inputDispatchingTimeoutNanos) {
this(taskController, token, listener, index, requestedOrientation, fullscreen,
showForAllUsers,
configChanges, voiceInteraction, launchTaskBehind, alwaysFocusable,
targetSdkVersion, rotationAnimationHint, inputDispatchingTimeoutNanos,
WindowManagerService.getInstance());
}
继续调用同名的方法
public AppWindowContainerController(TaskWindowContainerController taskController,
IApplicationToken token, AppWindowContainerListener listener, int index,
int requestedOrientation, boolean fullscreen, boolean showForAllUsers, int configChanges,
boolean voiceInteraction, boolean launchTaskBehind, boolean alwaysFocusable,
int targetSdkVersion, int rotationAnimationHint, long inputDispatchingTimeoutNanos,
WindowManagerService service) {
super(listener, service);
mHandler = new H(service.mH.getLooper());
mToken = token;
synchronized(mWindowMap) {
AppWindowToken atoken = mRoot.getAppWindowToken(mToken.asBinder());
if (atoken != null) {
// TODO: Should this throw an exception instead?
Slog.w(TAG_WM, "Attempted to add existing app token: " + mToken);
return;
}
final Task task = taskController.mContainer;
if (task == null) {
throw new IllegalArgumentException("AppWindowContainerController: invalid "
+ " controller=" + taskController);
}
atoken = createAppWindow(mService, token, voiceInteraction, task.getDisplayContent(),
inputDispatchingTimeoutNanos, fullscreen, showForAllUsers, targetSdkVersion,
requestedOrientation, rotationAnimationHint, configChanges, launchTaskBehind,
alwaysFocusable, this);
if (DEBUG_TOKEN_MOVEMENT || DEBUG_ADD_REMOVE) Slog.v(TAG_WM, "addAppToken: " + atoken
+ " controller=" + taskController + " at " + index);
task.addChild(atoken, index);
}
}
在此过程中会创建一个AppWindowToken的对象，createAppWindow的实现为
AppWindowToken createAppWindow(WindowManagerService service, IApplicationToken token,
boolean voiceInteraction, DisplayContent dc, long inputDispatchingTimeoutNanos,
boolean fullscreen, boolean showForAllUsers, int targetSdk, int orientation,
int rotationAnimationHint, int configChanges, boolean launchTaskBehind,
boolean alwaysFocusable, AppWindowContainerController controller) {
return new AppWindowToken(service, token, voiceInteraction, dc,
inputDispatchingTimeoutNanos, fullscreen, showForAllUsers, targetSdk, orientation,
rotationAnimationHint, configChanges, launchTaskBehind, alwaysFocusable,
controller);
}
进入到AppWindowToken的构造方法
AppWindowToken(WindowManagerService service, IApplicationToken token, boolean voiceInteraction,
DisplayContent dc, long inputDispatchingTimeoutNanos, boolean fullscreen,
boolean showForAllUsers, int targetSdk, int orientation, int rotationAnimationHint,
int configChanges, boolean launchTaskBehind, boolean alwaysFocusable,
AppWindowContainerController controller) {
this(service, token, voiceInteraction, dc, fullscreen);
setController(controller);
mInputDispatchingTimeoutNanos = inputDispatchingTimeoutNanos;
mShowForAllUsers = showForAllUsers;
mTargetSdk = targetSdk;
mOrientation = orientation;
layoutConfigChanges = (configChanges & (CONFIG_SCREEN_SIZE | CONFIG_ORIENTATION)) != 0;
mLaunchTaskBehind = launchTaskBehind;
mAlwaysFocusable = alwaysFocusable;
mRotationAnimationHint = rotationAnimationHint;
// Application tokens start out hidden.
setHidden(true);
hiddenRequested = true;
继续调用同名的方法
AppWindowToken(WindowManagerService service, IApplicationToken token, boolean voiceInteraction,
DisplayContent dc, boolean fillsParent) {
super(service, token != null ? token.asBinder() : null, TYPE_APPLICATION, true, dc,
false /* ownerCanManageAppTokens */);
appToken = token;
mVoiceInteraction = voiceInteraction;
mFillsParent = fillsParent;
mInputApplicationHandle = new InputApplicationHandle(this);
}
由于AppWindowToken的父类是WindowToken，进入到WindowToken的构造方法
WindowToken(WindowManagerService service, IBinder _token, int type, boolean persistOnEmpty,
DisplayContent dc, boolean ownerCanManageAppTokens) {
this(service, _token, type, persistOnEmpty, dc, ownerCanManageAppTokens,
false /* roundedCornersOverlay */);
}
继续进入到同名方法
WindowToken(WindowManagerService service, IBinder _token, int type, boolean persistOnEmpty,
DisplayContent dc, boolean ownerCanManageAppTokens, boolean roundedCornerOverlay) {
super(service);
token = _token;
windowType = type;
mPersistOnEmpty = persistOnEmpty;
mOwnerCanManageAppTokens = ownerCanManageAppTokens;
mRoundedCornerOverlay = roundedCornerOverlay;
onDisplayChanged(dc);
}
继续分析onDisplayChanged的方法
void onDisplayChanged(DisplayContent dc) {
dc.reParentWindowToken(this);
mDisplayContent = dc;
// The rounded corner overlay should not be rotated. We ensure that by moving it outside
// the windowing layer.
if (mRoundedCornerOverlay) {
mDisplayContent.reparentToOverlay(mPendingTransaction, mSurfaceControl);
}
// TODO(b/36740756): One day this should perhaps be hooked
// up with goodToGo, so we don't move a window
// to another display before the window behind
// it is ready.
super.onDisplayChanged(dc);
}
进而分析DisplayContent的reParentWindowToken方法
void reParentWindowToken(WindowToken token) {
final DisplayContent prevDc = token.getDisplayContent();
if (prevDc == this) {
return;
}
if (prevDc != null && prevDc.mTokenMap.remove(token.token) != null
&& token.asAppWindowToken() == null) {
// Removed the token from the map, but made sure it's not an app token before removing
// from parent.
token.getParent().removeChild(token);
}
addWindowToken(token.token, token);
}
addWindowToken的实现是
private void addWindowToken(IBinder binder, WindowToken token) {
final DisplayContent dc = mService.mRoot.getWindowTokenDisplay(token);
if (dc != null) {
// We currently don't support adding a window token to the display if the display
// already has the binder mapped to another token. If there is a use case for supporting
// this moving forward we will either need to merge the WindowTokens some how or have
// the binder map to a list of window tokens.
throw new IllegalArgumentException("Can't map token=" + token + " to display="
+ getName() + " already mapped to display=" + dc + " tokens=" + dc.mTokenMap);
}
if (binder == null) {
throw new IllegalArgumentException("Can't map token=" + token + " to display="
+ getName() + " binder is null");
}
if (token == null) {
throw new IllegalArgumentException("Can't map null token to display="
+ getName() + " binder=" + binder);
}
mTokenMap.put(binder, token);
if (token.asAppWindowToken() == null) {
// Add non-app token to container hierarchy on the display. App tokens are added through
// the parent container managing them (e.g. Tasks).
switch (token.windowType) {
case TYPE_WALLPAPER:
mBelowAppWindowsContainers.addChild(token);
break;
case TYPE_INPUT_METHOD:
case TYPE_INPUT_METHOD_DIALOG:
mImeWindowsContainers.addChild(token);
break;
default:
mAboveAppWindowsContainers.addChild(token);
break;
}
}
}
mTokenMap.put(binder, token);便是将ActivityRecord对应的token值保存到一个hashmap中
这样wms便存储了Activity对应的token值了，通过该token值便可以找到该activity了
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