深入分析TaskView源码之触摸相关

问题背景

hi，粉丝朋友们：
大家好！android 10以后TaskView作为替代ActivityView的容器，在课程的分屏pip自由窗口专题也进行了相关的详细介绍分析。

这里再补充一下相关的TaskView和桌面内嵌情况下的触摸分析

主要问题点：
1、明明TaskView属于CarLauncher的一个View，凭啥触摸自己的TaskView事件会让TaskView的Activity接收到
2、TaskView的Activity是怎么可以接收事件的呢？桌面怎么做到单独只排除TaskView其他地方都可以触摸呢？
哈哈，简单总结就是要搞清楚TaskView触摸响应原理。

问题分析切入点

一般说道触摸问题分析，一想到当然是窗口和input部分的dump信息分析
1、dumpsys activity containers

#1 DefaultTaskDisplayArea type=undefined mode=fullscreen override-mode=fullscreen requested-bounds=[0,0][0,0] bounds=[0,0][1408,792]#2 Task=1000011 type=standard mode=multi-window override-mode=multi-window requested-bounds=[404,76][1408,696] bounds=[404,76][1408,696]#0 ActivityRecord{38f55a5 u10 com.android.car.mapsplaceholder/.MapsPlaceholderActivity t1000011} type=standard mode=multi-window override-mode=undefined requested-bounds=[0,0][0,0] bounds=[404,76][1408,696]#0 60a6fdf com.android.car.mapsplaceholder/com.android.car.mapsplaceholder.MapsPlaceholderActivity type=standard mode=multi-window override-mode=undefined requested-bounds=[0,0][0,0] bounds=[404,76][1408,696]#1 Task=1 type=home mode=fullscreen override-mode=undefined requested-bounds=[0,0][0,0] bounds=[0,0][1408,792]#0 Task=1000006 type=home mode=fullscreen override-mode=undefined requested-bounds=[0,0][0,0] bounds=[0,0][1408,792]#0 ActivityRecord{185661 u10 com.android.car.carlauncher/.CarLauncher t1000006} type=home mode=fullscreen override-mode=undefined requested-bounds=[0,0][0,0] bounds=[0,0][1408,792]#0 6845fdb com.android.car.carlauncher/com.android.car.carlauncher.CarLauncher type=home mode=fullscreen override-mode=undefined requested-bounds=[0,0][0,0] bounds=[0,0][1408,792]

明显看到地图Activity的Task,windowmode属于multi-window
#2 Task=1000011 type=standard mode=multi-window override-mode=multi-window requested-bounds=[404,76][1408,696] bounds=[404,76][1408,696]
在CarLauncher 的Task ，windowmode为fullscreen
#1 Task=1 type=home mode=fullscreen override-mode=undefined requested-bounds=[0,0][0,0] bounds=[0,0][1408,792]

注意一下地图的Task的bounds区域[404,76][1408,696] ,而CarLauncher的区域属于全屏的 bounds=[0,0][1408,792]
这么一看确实桌面的显示bound是包含了地图的Bound

所以这里可以初步理解为：

TaskView的地图是可以独立接受触摸时间的，因为它本身是独立的bounds区域，触摸到了这个区域就行
但是因为和CarLauncher有重叠，那么CarLauncher对这个TaskView部分的区域触摸是怎么处理的，会接受这一部分的触摸事件吗？毕竟这区域又是CarLauncher的一个TaskView区域，地图Activity也只是TaskView显示的内容而已
哈哈，这里就需要使用我们dumpsys input来解密

adb shell dumpsys input：

Input Dispatcher State:DispatchEnabled: trueDispatchFrozen: falseInputFilterEnabled: falseFocusedDisplayId: 0FocusedApplications:displayId=0, name='ActivityRecord{38f55a5 u10 com.android.car.mapsplaceholder/.MapsPlaceholderActivity t1000011}', dispatchingTimeout=5000msFocusedWindows:displayId=0, name='60a6fdf com.android.car.mapsplaceholder/com.android.car.mapsplaceholder.MapsPlaceholderActivity'FocusRequests:displayId=0, name='60a6fdf com.android.car.mapsplaceholder/com.android.car.mapsplaceholder.MapsPlaceholderActivity' result='OK'Pointer Capture Requested: falseCurrent Window with Pointer Capture: NoneTouchStates: <no displays touched>Display: 0logicalSize=1408x792transform (ROT_0) (IDENTITY)Windows:0: name='aa0d3fc BottomCarSystemBar', id=77, displayId=0, inputConfig=NOT_FOCUSABLE | TRUSTED_OVERLAY | WATCH_OUTSIDE_TOUCH, alpha=1.00, frame=[0,696][1408,792], globalScale=1.000000, applicationInfo.name=, applicationInfo.token=<null>, touchableRegion=[0,696][1408,792], ownerPid=1375, ownerUid=10150, dispatchingTimeout=5000ms, hasToken=0x7c04338b1ad0, touchOcclusionMode=BLOCK_UNTRUSTEDtransform (ROT_0) (TRANSLATE)1.0000  0.0000  -0.00000.0000  1.0000  -696.00000.0000  0.0000  1.00001: name='e8091e TopCarSystemBar', id=76, displayId=0, inputConfig=NOT_FOCUSABLE | TRUSTED_OVERLAY | WATCH_OUTSIDE_TOUCH, alpha=1.00, frame=[0,0][1408,76], globalScale=1.000000, applicationInfo.name=, applicationInfo.token=<null>, touchableRegion=[0,0][1408,76], ownerPid=1375, ownerUid=10150, dispatchingTimeout=5000ms, hasToken=0x7c04338d6310, touchOcclusionMode=BLOCK_UNTRUSTEDtransform (ROT_0) (IDENTITY)2: name='aff2cfa com.android.car.rotary', id=101, displayId=0, inputConfig=NOT_FOCUSABLE | PREVENT_SPLITTING | TRUSTED_OVERLAY | WATCH_OUTSIDE_TOUCH, alpha=1.00, frame=[1408,76][1408,76], globalScale=1.000000, applicationInfo.name=, applicationInfo.token=<null>, touchableRegion=<empty>, ownerPid=1871, ownerUid=1010088, dispatchingTimeout=5000ms, hasToken=0x7c04338e0bd0, touchOcclusionMode=USE_OPACITYtransform (ROT_0) (TRANSLATE)1.0000  0.0000  -1408.00000.0000  1.0000  -76.00000.0000  0.0000  1.00003: name='2cdb9e1 ActivityRecordInputSink com.aospinsight.dummyaidlapp/.MainActivity', id=194, displayId=0, inputConfig=NO_INPUT_CHANNEL | NOT_VISIBLE | NOT_FOCUSABLE | NOT_TOUCHABLE, alpha=1.00, frame=[0,0][0,0], globalScale=0.000000, applicationInfo.name=, applicationInfo.token=<null>, touchableRegion=[-14079,-7919][14080,7920], ownerPid=701, ownerUid=1000, dispatchingTimeout=0ms, hasToken=<null>, touchOcclusionMode=BLOCK_UNTRUSTEDtransform (ROT_0) (IDENTITY)4: name='6845fdb com.android.car.carlauncher/com.android.car.carlauncher.CarLauncher', id=205, displayId=0, inputConfig=TRUSTED_OVERLAY, alpha=1.00, frame=[0,0][1408,792], globalScale=1.000000, applicationInfo.name=ActivityRecord{185661 u10 com.android.car.carlauncher/.CarLauncher t1000006}, applicationInfo.token=0x7c04e3536310, touchableRegion=[0,0][1408,76]|[0,76][404,696]|[0,696][1408,792], ownerPid=1658, ownerUid=1010079, dispatchingTimeout=5000ms, hasToken=0x7c04338f3cd0, touchOcclusionMode=BLOCK_UNTRUSTEDtransform (ROT_0) (IDENTITY)5: name='60a6fdf com.android.car.mapsplaceholder/com.android.car.mapsplaceholder.MapsPlaceholderActivity', id=223, displayId=0, inputConfig=0x0, alpha=1.00, frame=[404,76][1408,696], globalScale=1.000000, applicationInfo.name=ActivityRecord{38f55a5 u10 com.android.car.mapsplaceholder/.MapsPlaceholderActivity t1000011}, applicationInfo.token=0x7c04e355be70, touchableRegion=[404,76][1408,696], ownerPid=22792, ownerUid=1010122, dispatchingTimeout=5000ms, hasToken=0x7c0433933dd0, touchOcclusionMode=BLOCK_UNTRUSTEDtransform (ROT_0) (TRANSLATE)1.0000  0.0000  -404.00000.0000  1.0000  -76.00000.0000  0.0000  1.00006: name='a9ab86e ActivityRecordInputSink com.android.car.mapsplaceholder/.MapsPlaceholderActivity', id=221, displayId=0, inputConfig=NO_INPUT_CHANNEL | NOT_FOCUSABLE, alpha=1.00, frame=[404,76][404,76], globalScale=0.000000, applicationInfo.name=, applicationInfo.token=<null>, touchableRegion=[404,76][1408,696], ownerPid=701, ownerUid=1000, dispatchingTimeout=0ms, hasToken=<null>, touchOcclusionMode=BLOCK_UNTRUSTEDtransform (ROT_0) (TRANSLATE)1.0000  0.0000  -404.00000.0000  1.0000  -76.00000.0000  0.0000  1.00007: name='c2d4eae ActivityRecordInputSink com.android.car.carlauncher/.CarLauncher', id=126, displayId=0, inputConfig=NO_INPUT_CHANNEL | NOT_FOCUSABLE, alpha=1.00, frame=[0,0][0,0], globalScale=0.000000, applicationInfo.name=, applicationInfo.token=<null>, touchableRegion=[-14079,-7919][14080,7920], ownerPid=701, ownerUid=1000, dispatchingTimeout=0ms, hasToken=<null>, touchOcclusionMode=BLOCK_UNTRUSTED

这里我们只需要重点关注窗口4和窗口5：
–桌面Activity
4: name=‘6845fdb com.android.car.carlauncher/com.android.car.carlauncher.CarLauncher’, id=205, displayId=0, inputConfig=TRUSTED_OVERLAY, alpha=1.00, frame=[0,0][1408,792], globalScale=1.000000, applicationInfo.name=ActivityRecord{185661 u10 com.android.car.carlauncher/.CarLauncher t1000006}, applicationInfo.token=0x7c04e3536310, touchableRegion=[0,0][1408,76]|[0,76][404,696]|[0,696][1408,792], ownerPid=1658, ownerUid=1010079, dispatchingTimeout=5000ms, hasToken=0x7c04338f3cd0, touchOcclusionMode=BLOCK_UNTRUSTED
transform (ROT_0) (IDENTITY)
–地图Activity
5: name=‘60a6fdf com.android.car.mapsplaceholder/com.android.car.mapsplaceholder.MapsPlaceholderActivity’, id=223, displayId=0, inputConfig=0x0, alpha=1.00, frame=[404,76][1408,696], globalScale=1.000000, applicationInfo.name=ActivityRecord{38f55a5 u10 com.android.car.mapsplaceholder/.MapsPlaceholderActivity t1000011}, applicationInfo.token=0x7c04e355be70, touchableRegion=[404,76][1408,696], ownerPid=22792, ownerUid=1010122, dispatchingTimeout=5000ms, hasToken=0x7c0433933dd0, touchOcclusionMode=BLOCK_UNTRUSTED
transform (ROT_0) (TRANSLATE)
1.0000 0.0000 -404.0000
0.0000 1.0000 -76.0000
0.0000 0.0000 1.0000

明显发现触摸派发window层级方面还是以桌面为顶部window，地图为底下window，这样其实也可以理解，我们上面的说的情况一样，其实整个画面都是CarLauncher的，地图Activity也只是CarLauncher的一个View而已。所以当然把桌面作为顶部的派发事件window完全没有问题。
但是问题来了，桌面把fullscreen面积占了？那么怎么才可以轮到地图Activity

大家注意看看桌面的window的这个属性

touchableRegion=[0,0][1408,76]|[0,76][404,696]|[0,696][1408,792],
是不是有个touchableRegion，对他就是真相，他负责了划定CarLauncher这个window可以响应的触摸区域，这里明显看出，这个区域划分了看了如下部分：

[0,76][404,696]| ----排除TaskView的的地图Activity区域

正常地图Activity的区域是[404,76][1408,696]从404开始到屏幕最右
[0,76][404,696]| 明显是只从0到404就截止了

这里就说明了CarLauncher虽然在顶部，但是他的touchRegion根本没有包含地图Activity的区域，所以派发事件时候根本不会抢地图Activity的，即地图区域的事件不会派发到桌面
总结：
问题关键找到了，就是靠touchRegion来让CarLauncher不接受地图Activity的Region

哪里设置的TouchRegion呢？

这里如果直接寻找比较麻烦可以用dumpsys window windows命令看看window是不是带了

下面就来分析这个桌面的TouchRegion是在哪里设置的呢？来看看对应dump代码
frameworks/base/services/core/java/com/android/server/wm/WindowState.java

 if (dumpAll) {pw.println(prefix + "mGivenContentInsets=" + mGivenContentInsets.toShortString(sTmpSB)+ " mGivenVisibleInsets=" + mGivenVisibleInsets.toShortString(sTmpSB));if (mTouchableInsets != 0 || mGivenInsetsPending) {pw.println(prefix + "mTouchableInsets=" + mTouchableInsets+ " mGivenInsetsPending=" + mGivenInsetsPending);Region region = new Region();getTouchableRegion(region);pw.println(prefix + "touchable region=" + region);}pw.println(prefix + "mFullConfiguration=" + getConfiguration());pw.println(prefix + "mLastReportedConfiguration=" + getLastReportedConfiguration());}//再来看看getTouchableRegion方法/** Get the touchable region in global coordinates. */void getTouchableRegion(Region outRegion) {final Rect frame = mWindowFrames.mFrame;switch (mTouchableInsets) {default:case TOUCHABLE_INSETS_FRAME:outRegion.set(frame);break;case TOUCHABLE_INSETS_CONTENT:applyInsets(outRegion, frame, mGivenContentInsets);break;case TOUCHABLE_INSETS_VISIBLE:applyInsets(outRegion, frame, mGivenVisibleInsets);break;case TOUCHABLE_INSETS_REGION: {//走的是这里outRegion.set(mGivenTouchableRegion);if (frame.left != 0 || frame.top != 0) {outRegion.translate(frame.left, frame.top);}break;}}cropRegionToRootTaskBoundsIfNeeded(outRegion);subtractTouchExcludeRegionIfNeeded(outRegion);}

那么这里的mGivenTouchableRegion是哪里设置的呢？

frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java

void setInsetsWindow(Session session, IWindow client, int touchableInsets, Rect contentInsets,Rect visibleInsets, Region touchableRegion) {int uid = Binder.getCallingUid();int pid = Binder.getCallingPid();final long origId = Binder.clearCallingIdentity();try {synchronized (mGlobalLock) {WindowState w = windowForClientLocked(session, client, false);if (DEBUG_LAYOUT) Slog.d(TAG, "setInsetsWindow " + w+ ", contentInsets=" + w.mGivenContentInsets + " -> " + contentInsets+ ", visibleInsets=" + w.mGivenVisibleInsets + " -> " + visibleInsets+ ", touchableRegion=" + w.mGivenTouchableRegion + " -> " + touchableRegion+ ", touchableInsets " + w.mTouchableInsets + " -> " + touchableInsets);if (w != null) {w.mGivenInsetsPending = false;w.mGivenContentInsets.set(contentInsets);w.mGivenVisibleInsets.set(visibleInsets);w.mGivenTouchableRegion.set(touchableRegion);//这里进行的设置w.mTouchableInsets = touchableInsets;if (w.mGlobalScale != 1) {w.mGivenContentInsets.scale(w.mGlobalScale);w.mGivenVisibleInsets.scale(w.mGlobalScale);w.mGivenTouchableRegion.scale(w.mGlobalScale);}w.setDisplayLayoutNeeded();w.updateSourceFrame(w.getFrame());mWindowPlacerLocked.performSurfacePlacement();w.getDisplayContent().getInputMonitor().updateInputWindowsLw(true);// We need to report touchable region changes to accessibility.if (mAccessibilityController.hasCallbacks()) {mAccessibilityController.onSomeWindowResizedOrMovedWithCallingUid(uid, w.getDisplayContent().getDisplayId());}}}} finally {Binder.restoreCallingIdentity(origId);}}

那么接下来再看看谁进行的setInsetsWindow调用：
frameworks/base/services/core/java/com/android/server/wm/Session.java

  @Overridepublic void setInsets(IWindow window, int touchableInsets,Rect contentInsets, Rect visibleInsets, Region touchableArea) {mService.setInsetsWindow(this, window, touchableInsets, contentInsets,visibleInsets, touchableArea);}

那么是谁调用了setInsets呢？

frameworks/base/libs/WindowManager/Shell/src/com/android/wm/shell/TaskView.java

    public void onComputeInternalInsets(ViewTreeObserver.InternalInsetsInfo inoutInfo) {// TODO(b/176854108): Consider to move the logic into gatherTransparentRegions since this//   is dependent on the order of listener.// If there are multiple TaskViews, we'll set the touchable area as the root-view, then// subtract each TaskView from it.if (inoutInfo.touchableRegion.isEmpty()) {inoutInfo.setTouchableInsets(ViewTreeObserver.InternalInsetsInfo.TOUCHABLE_INSETS_REGION);View root = getRootView();root.getLocationInWindow(mTmpLocation);mTmpRootRect.set(mTmpLocation[0], mTmpLocation[1], root.getWidth(), root.getHeight());inoutInfo.touchableRegion.set(mTmpRootRect);}getLocationInWindow(mTmpLocation);mTmpRect.set(mTmpLocation[0], mTmpLocation[1],mTmpLocation[0] + getWidth(), mTmpLocation[1] + getHeight());inoutInfo.touchableRegion.op(mTmpRect, Region.Op.DIFFERENCE);if (mObscuredTouchRegion != null) {inoutInfo.touchableRegion.op(mObscuredTouchRegion, Region.Op.UNION);}}

然后在调用对于的setInsets
在 performTraversals() 中进行相关的调用操作
frameworks/base/core/java/android/view/ViewRootImpl.java

setInsets

更多framework干货课程如下（需要的可以私聊马哥 获取优惠 +V ：androidframework007）：