b站免费视频教程讲解：
https://www.bilibili.com/video/BV1wj411o7A9/
pip窗口的开始移动过程种有一个删除按钮显示过程：
显示DismissTarget调用堆栈：
showDismissTargetMaybe:287, PipDismissTargetHandler (com.android.wm.shell.pip.phone)
onMove:828, PipTouchHandler$DefaultPipTouchGesture (com.android.wm.shell.pip.phone)
handleTouchEvent:575, PipTouchHandler (com.android.wm.shell.pip.phone)
onInputEvent:-1, PipController$$ExternalSyntheticLambda5 (com.android.wm.shell.pip.phone)
onInputEvent:76, PipInputConsumer$InputEventReceiver (com.android.wm.shell.pip.phone)
dispatchInputEvent:267, InputEventReceiver (android.view)
nativeConsumeBatchedInputEvents:-1, InputEventReceiver (android.view)
consumeBatchedInputEvents:247, InputEventReceiver (android.view)
doConsumeBatchedInput:84, BatchedInputEventReceiver (android.view)
run:113, BatchedInputEventReceiver$BatchedInputRunnable (android.view)
run:1231, Choreographer$CallbackRecord (android.view)
run:1239, Choreographer$CallbackRecord (android.view)
doCallbacks:899, Choreographer (android.view)
doFrame:824, Choreographer (android.view)
run:1214, Choreographer$FrameDisplayEventReceiver (android.view)
handleCallback:942, Handler (android.os)
dispatchMessage:99, Handler (android.os)
loopOnce:201, Looper (android.os)
loop:288, Looper (android.os)
main:7898, ActivityThread (android.app)
invoke:-1, Method (java.lang.reflect)
run:548, RuntimeInit$MethodAndArgsCaller (com.android.internal.os)
main:936, ZygoteInit (com.android.internal.os)
相关的创建DismissTarget的方法：
public void createOrUpdateDismissTarget() {
if (!mTargetViewContainer.isAttachedToWindow()) {
mTargetViewContainer.cancelAnimators();
mTargetViewContainer.setVisibility(View.INVISIBLE);
mTargetViewContainer.getViewTreeObserver().removeOnPreDrawListener(this);
mHasDismissTargetSurface = false;
try {
mWindowManager.addView(mTargetViewContainer, getDismissTargetLayoutParams());
} catch (IllegalStateException e) {
// This shouldn't happen, but if the target is already added, just update its layout
// params.
mWindowManager.updateViewLayout(
mTargetViewContainer, getDismissTargetLayoutParams());
}
} else {
mWindowManager.updateViewLayout(mTargetViewContainer, getDismissTargetLayoutParams());
}
}
pip窗口触摸事件的接受部分解析：
从上面的删除按钮窗口展示堆栈可以看出pip窗口的触摸事件传递：
onInputEvent:-1, PipController$$ExternalSyntheticLambda5 (com.android.wm.shell.pip.phone)
onInputEvent:76, PipInputConsumer$InputEventReceiver (com.android.wm.shell.pip.phone)
dispatchInputEvent:267, InputEventReceiver (android.view)
其实核心是PipInputConsumer类，这里可以对PipInputConsumer进行详细分析
PipInputConsumer可以接受触摸事件的核心是靠调用了这个注册方法：
public void registerInputConsumer() {
if (mInputEventReceiver != null) {
return;
}
final InputChannel inputChannel = new InputChannel();//构建对应的InputChannel
try {
// TODO(b/113087003): Support Picture-in-picture in multi-display.
mWindowManager.destroyInputConsumer(mName, DEFAULT_DISPLAY);
//调用到wms的createInputConsumer方法
mWindowManager.createInputConsumer(mToken, mName, DEFAULT_DISPLAY, inputChannel);
} catch (RemoteException e) {
ProtoLog.e(ShellProtoLogGroup.WM_SHELL_PICTURE_IN_PICTURE,
"%s: Failed to create input consumer, %s", TAG, e);
}
mMainExecutor.execute(() -> {
mInputEventReceiver = new InputEventReceiver(inputChannel,
Looper.myLooper(), Choreographer.getSfInstance());
if (mRegistrationListener != null) {
mRegistrationListener.onRegistrationChanged(true /* isRegistered */);
}
});
}
接下来重点看createInputConsumer
public void createInputConsumer(IBinder token, String name, int displayId,
InputChannel inputChannel) {
synchronized (mGlobalLock) {
DisplayContent display = mRoot.getDisplayContent(displayId);
if (display != null) {
display.getInputMonitor().createInputConsumer(token, name, inputChannel,
Binder.getCallingPid(), Binder.getCallingUserHandle());
}
}
}
//有调用到了InputMonitor的createInputConsumer
void createInputConsumer(IBinder token, String name, InputChannel inputChannel, int clientPid,
UserHandle clientUser) {
//这个地方是核心关键，会创建对应的InputConsumerImpl
final InputConsumerImpl consumer = new InputConsumerImpl(mService, token, name,
inputChannel, clientPid, clientUser, mDisplayId);
switch (name) {
case INPUT_CONSUMER_WALLPAPER:
break;
case INPUT_CONSUMER_PIP:
break;
case INPUT_CONSUMER_RECENTS_ANIMATION:
consumer.mWindowHandle.inputConfig &= ~InputConfig.NOT_FOCUSABLE;
break;
}
//添加这个name为INPUT_CONSUMER_PIP的Consumer
addInputConsumer(name, consumer);
}
//下面重点分析一下InputConsumerImpl这个构造
InputConsumerImpl(WindowManagerService service, IBinder token, String name,
InputChannel inputChannel, int clientPid, UserHandle clientUser, int displayId) {
//调用InputManager创建相关的inputchannel，而且把inputchannel拷贝回systemui构造的inputchannel，这样inputchannel就可以通讯接受事件了
mClientChannel = mService.mInputManager.createInputChannel(name);
if (inputChannel != null) {
mClientChannel.copyTo(inputChannel);
}
//省略
}
综上就清楚了pip的触摸事件其实是自己使用独立的inputchannel进行的接受，和pip这个activity的窗口inputchannel没有啥关系。
pip窗口被拖拽跟手移动情况下：
相关移动其实移动的都是leash图层，都不是对相关pip的Task进行相关的bounds更新：
scheduleUserResizePip:1235, PipTaskOrganizer (com.android.wm.shell.pip)
scheduleUserResizePip:1212, PipTaskOrganizer (com.android.wm.shell.pip)
movePip:278, PipMotionHelper (com.android.wm.shell.pip.phone)
onMove:845, PipTouchHandler$DefaultPipTouchGesture (com.android.wm.shell.pip.phone)
handleTouchEvent:575, PipTouchHandler (com.android.wm.shell.pip.phone)
onInputEvent:-1, PipController$$ExternalSyntheticLambda5 (com.android.wm.shell.pip.phone)
onInputEvent:76, PipInputConsumer$InputEventReceiver (com.android.wm.shell.pip.phone)
dispatchInputEvent:267, InputEventReceiver (android.view)
nativeConsumeBatchedInputEvents:-1, InputEventReceiver (android.view)
consumeBatchedInputEvents:247, InputEventReceiver (android.view)
doConsumeBatchedInput:84, BatchedInputEventReceiver (android.view)
run:113, BatchedInputEventReceiver$BatchedInputRunnable (android.view)
run:1231, Choreographer$CallbackRecord (android.view)
run:1239, Choreographer$CallbackRecord (android.view)
doCallbacks:899, Choreographer (android.view)
doFrame:824, Choreographer (android.view)
run:1214, Choreographer$FrameDisplayEventReceiver (android.view)
handleCallback:942, Handler (android.os)
dispatchMessage:99, Handler (android.os)
loopOnce:201, Looper (android.os)
loop:288, Looper (android.os)
main:7898, ActivityThread (android.app)
invoke:-1, Method (java.lang.reflect)
run:548, RuntimeInit$MethodAndArgsCaller (com.android.internal.os)
main:936, ZygoteInit (com.android.internal.os)
相关的移动更新代码：
public void scheduleUserResizePip(Rect startBounds, Rect toBounds, float degrees,
Consumer<Rect> updateBoundsCallback) {
//省略
final SurfaceControl.Transaction tx = mSurfaceControlTransactionFactory.getTransaction();
//核心关键点就是对mLeash在scale方法中进行相关的图层位置进行更新
mSurfaceTransactionHelper
.scale(tx, mLeash, startBounds, toBounds, degrees)
.round(tx, mLeash, startBounds, toBounds);
if (mPipMenuController.isMenuVisible()) {
mPipMenuController.movePipMenu(mLeash, tx, toBounds);
} else {
tx.apply();
}
if (updateBoundsCallback != null) {
updateBoundsCallback.accept(toBounds);
}
}
//scale方法
public PipSurfaceTransactionHelper scale(SurfaceControl.Transaction tx, SurfaceControl leash,
Rect sourceBounds, Rect destinationBounds, float degrees) {
mTmpSourceRectF.set(sourceBounds);
mTmpSourceRectF.offsetTo(0, 0);
mTmpDestinationRectF.set(destinationBounds);
mTmpTransform.setRectToRect(mTmpSourceRectF, mTmpDestinationRectF, Matrix.ScaleToFit.FILL);
mTmpTransform.postRotate(degrees,
mTmpDestinationRectF.centerX(), mTmpDestinationRectF.centerY());
//对图层进行相关的matrix进行设置，这里面就是相关的偏移等
tx.setMatrix(leash, mTmpTransform, mTmpFloat9);
return this;
}
结下来分析一下松手后，才会真正对Task的Bounds进行设置相关堆栈
松手后会进行一个简单的pip窗口移动动画：
startBoundsAnimator:614, PipMotionHelper (com.android.wm.shell.pip.phone)
movetoTarget:451, PipMotionHelper (com.android.wm.shell.pip.phone)
flingToSnapTarget:405, PipMotionHelper (com.android.wm.shell.pip.phone)
onUp:889, PipTouchHandler$DefaultPipTouchGesture (com.android.wm.shell.pip.phone)
handleTouchEvent:587, PipTouchHandler (com.android.wm.shell.pip.phone)
onInputEvent:-1, PipController$$ExternalSyntheticLambda5 (com.android.wm.shell.pip.phone)
onInputEvent:76, PipInputConsumer$InputEventReceiver (com.android.wm.shell.pip.phone)
dispatchInputEvent:267, InputEventReceiver (android.view)
nativePollOnce:-1, MessageQueue (android.os)
next:335, MessageQueue (android.os)
loopOnce:161, Looper (android.os)
loop:288, Looper (android.os)
main:7898, ActivityThread (android.app)
invoke:-1, Method (java.lang.reflect)
run:548, RuntimeInit$MethodAndArgsCaller (com.android.internal.os)
main:936, ZygoteInit (com.android.internal.os)
动画播放完成后进行相关bounds设置：
07-02 16:09:40.678 748 748 I lsm11 : applyTransaction 1 t = WindowContainerTransaction { changes = {android.os.BinderProxy@f5e9dbd={bounds:Rect(61, 690 - 839, 1068),hasBoundsTransaction,}} hops = [] errorCallbackToken=null taskFragmentOrganizer=null }
07-02 16:09:40.678 748 748 I lsm11 : java.lang.Exception
07-02 16:09:40.678 748 748 I lsm11 : at android.window.WindowOrganizer.applyTransaction(WindowOrganizer.java:53)
07-02 16:09:40.678 748 748 I lsm11 : at com.android.wm.shell.pip.PipTaskOrganizer.applyFinishBoundsResize(PipTaskOrganizer.java:1436)
07-02 16:09:40.678 748 748 I lsm11 : at com.android.wm.shell.pip.PipTaskOrganizer.finishResize(PipTaskOrganizer.java:1383)
07-02 16:09:40.678 748 748 I lsm11 : at com.android.wm.shell.pip.PipTaskOrganizer.scheduleFinishResizePip(PipTaskOrganizer.java:1279)
07-02 16:09:40.678 748 748 I lsm11 : at com.android.wm.shell.pip.PipTaskOrganizer.scheduleFinishResizePip(PipTaskOrganizer.java:1261)
07-02 16:09:40.678 748 748 I lsm11 : at com.android.wm.shell.pip.PipTaskOrganizer.scheduleFinishResizePip(PipTaskOrganizer.java:1253)
07-02 16:09:40.678 748 748 I lsm11 : at com.android.wm.shell.pip.phone.PipMotionHelper.onBoundsPhysicsAnimationEnd(PipMotionHelper.java:657)
07-02 16:09:40.678 748 748 I lsm11 : at com.android.wm.shell.pip.phone.PipMotionHelper.$r8$lambda$QFpQr4PSFRGfS8YBsx6HKEKo4u4(Unknown Source:0)
07-02 16:09:40.678 748 748 I lsm11 : at com.android.wm.shell.pip.phone.PipMotionHelper$$ExternalSyntheticLambda4.run(Unknown Source:2)
07-02 16:09:40.678 748 748 I lsm11 : at com.android.wm.shell.animation.PhysicsAnimator$withEndActions$1$1.invoke(PhysicsAnimator.kt:445)
07-02 16:09:40.678 748 748 I lsm11 : at com.android.wm.shell.animation.PhysicsAnimator$withEndActions$1$1.invoke(PhysicsAnimator.kt:445)
07-02 16:09:40.678 748 748 I lsm11 : at com.android.wm.shell.animation.PhysicsAnimator$InternalListener.onInternalAnimationEnd$frameworks__base__libs__WindowManager__Shell__android_common__WindowManager_Shell(PhysicsAnimator.kt:776)
07-02 16:09:40.678 748 748 I lsm11 : at com.android.wm.shell.animation.PhysicsAnimator$configureDynamicAnimation$2$1.invoke(PhysicsAnimator.kt:672)
07-02 16:09:40.678 748 748 I lsm11 : at com.android.wm.shell.animation.PhysicsAnimator$configureDynamicAnimation$2$1.invoke(PhysicsAnimator.kt:671)
07-02 16:09:40.678 748 748 I lsm11 : at kotlin.collections.CollectionsKt__MutableCollectionsKt.filterInPlace$CollectionsKt__MutableCollectionsKt(MutableCollections.kt:285)
07-02 16:09:40.678 748 748 I lsm11 : at kotlin.collections.CollectionsKt__MutableCollectionsKt.removeAll(MutableCollections.kt:269)
07-02 16:09:40.678 748 748 I lsm11 : at com.android.wm.shell.animation.PhysicsAnimator$configureDynamicAnimation$2.onAnimationEnd(PhysicsAnimator.kt:671)
07-02 16:09:40.678 748 748 I lsm11 : at androidx.dynamicanimation.animation.DynamicAnimation.endAnimationInternal(DynamicAnimation.java:715)
07-02 16:09:40.678 748 748 I lsm11 : at androidx.dynamicanimation.animation.DynamicAnimation.doAnimationFrame(DynamicAnimation.java:690)
07-02 16:09:40.678 748 748 I lsm11 : at androidx.dynamicanimation.animation.AnimationHandler.doAnimationFrame(AnimationHandler.java:170)
07-02 16:09:40.678 748 748 I lsm11 : at androidx.dynamicanimation.animation.AnimationHandler$AnimationCallbackDispatcher.dispatchAnimationFrame(AnimationHandler.java:71)
07-02 16:09:40.678 748 748 I lsm11 : at androidx.dynamicanimation.animation.AnimationHandler.lambda$new$0(AnimationHandler.java:93)
07-02 16:09:40.678 748 748 I lsm11 : at androidx.dynamicanimation.animation.AnimationHandler.$r8$lambda$YiBk3K09ifLdAPQDzrOxNk7Tzy0(Unknown Source:0)
07-02 16:09:40.678 748 748 I lsm11 : at androidx.dynamicanimation.animation.AnimationHandler$$ExternalSyntheticLambda0.run(Unknown Source:2)
07-02 16:09:40.678 748 748 I lsm11 : at com.android.wm.shell.pip.phone.PipMotionHelper$1.lambda$postFrameCallback$0(PipMotionHelper.java:100)
pip窗口靠近删除按钮要被删除动画部分：
相关调用堆栈
animateIntoDismissTarget:301, PipMotionHelper (com.android.wm.shell.pip.phone)
lambda$init$1:126, PipDismissTargetHandler (com.android.wm.shell.pip.phone)
$r8$lambda$7QUxuWTiiuYb4BpTVK2nS5TXgZA:-1, PipDismissTargetHandler (com.android.wm.shell.pip.phone)
invoke:-1, PipDismissTargetHandler$$ExternalSyntheticLambda1 (com.android.wm.shell.pip.phone)
maybeConsumeMotionEvent:390, MagnetizedObject (com.android.wm.shell.common.magnetictarget)
maybeConsumeMotionEvent:181, PipDismissTargetHandler (com.android.wm.shell.pip.phone)
handleTouchEvent:549, PipTouchHandler (com.android.wm.shell.pip.phone)
onInputEvent:-1, PipController$$ExternalSyntheticLambda5 (com.android.wm.shell.pip.phone)
onInputEvent:76, PipInputConsumer$InputEventReceiver (com.android.wm.shell.pip.phone)
dispatchInputEvent:267, InputEventReceiver (android.view)
nativeConsumeBatchedInputEvents:-1, InputEventReceiver (android.view)
consumeBatchedInputEvents:247, InputEventReceiver (android.view)
doConsumeBatchedInput:84, BatchedInputEventReceiver (android.view)
run:113, BatchedInputEventReceiver$BatchedInputRunnable (android.view)
run:1231, Choreographer$CallbackRecord (android.view)
run:1239, Choreographer$CallbackRecord (android.view)
doCallbacks:899, Choreographer (android.view)
doFrame:824, Choreographer (android.view)
run:1214, Choreographer$FrameDisplayEventReceiver (android.view)
handleCallback:942, Handler (android.os)
dispatchMessage:99, Handler (android.os)
loopOnce:201, Looper (android.os)
loop:288, Looper (android.os)
main:7898, ActivityThread (android.app)
invoke:-1, Method (java.lang.reflect)
run:548, RuntimeInit$MethodAndArgsCaller (com.android.internal.os)
main:936, ZygoteInit (com.android.internal.os)
对应pip窗口缩小动画方法：
/** Animates the PIP into the dismiss target, scaling it down. */
void animateIntoDismissTarget(
MagnetizedObject.MagneticTarget target,
float velX, float velY,
boolean flung, Function0<Unit> after) {
final PointF targetCenter = target.getCenterOnScreen();
// PIP should fit in the circle
final float dismissCircleSize = mContext.getResources().getDimensionPixelSize(
R.dimen.dismiss_circle_size);
final float width = getBounds().width();
final float height = getBounds().height();
final float ratio = width / height;
// Width should be a little smaller than the circle size.
final float desiredWidth = dismissCircleSize * DISMISS_CIRCLE_PERCENT;
final float desiredHeight = desiredWidth / ratio;
final float destinationX = targetCenter.x - (desiredWidth / 2f);
final float destinationY = targetCenter.y - (desiredHeight / 2f);
// If we're already in the dismiss target area, then there won't be a move to set the
// temporary bounds, so just initialize it to the current bounds.
if (!mPipBoundsState.getMotionBoundsState().isInMotion()) {
mPipBoundsState.getMotionBoundsState().setBoundsInMotion(getBounds());
}
mTemporaryBoundsPhysicsAnimator
.spring(FloatProperties.RECT_X, destinationX, velX, mAnimateToDismissSpringConfig)
.spring(FloatProperties.RECT_Y, destinationY, velY, mAnimateToDismissSpringConfig)
.spring(FloatProperties.RECT_WIDTH, desiredWidth, mAnimateToDismissSpringConfig)
.spring(FloatProperties.RECT_HEIGHT, desiredHeight, mAnimateToDismissSpringConfig)
.withEndActions(after);
//直接启动动画
startBoundsAnimator(destinationX, destinationY);
}
删除窗口图标的动画关键条件maybeConsumeMotionEvent：
fun maybeConsumeMotionEvent(ev: MotionEvent): Boolean {
//省略
val targetObjectIsInMagneticFieldOf = associatedTargets.firstOrNull { target ->
//当前motionevent的x,y和删除按钮中心x，y距离计算是否已经小于阈值
val distanceFromTargetCenter = hypot(
ev.rawX - target.centerOnScreen.x,
ev.rawY - target.centerOnScreen.y)
distanceFromTargetCenter < target.magneticFieldRadiusPx
}
// If we aren't currently stuck to a target, and we're in the magnetic field of a target,
// we're newly stuck.
val objectNewlyStuckToTarget =
!objectStuckToTarget && targetObjectIsInMagneticFieldOf != null
// If we are currently stuck to a target, we're in the magnetic field of a target, and that
// target isn't the one we're currently stuck to, then touch events have moved into a
// adjacent target's magnetic field.
val objectMovedIntoDifferentTarget =
objectStuckToTarget &&
targetObjectIsInMagneticFieldOf != null &&
targetObjectIsStuckTo != targetObjectIsInMagneticFieldOf
if (objectNewlyStuckToTarget || objectMovedIntoDifferentTarget) {
velocityTracker.computeCurrentVelocity(1000)
val velX = velocityTracker.xVelocity
val velY = velocityTracker.yVelocity
// If the object is moving too quickly within the magnetic field, do not stick it. This
// only applies to objects newly stuck to a target. If the object is moved into a new
// target, it wasn't moving at all (since it was stuck to the previous one).
if (objectNewlyStuckToTarget && abs(velX) > stickToTargetMaxXVelocity) {
return false
}
// This touch event is newly within the magnetic field - let the listener know, and
// animate sticking to the magnet.
targetObjectIsStuckTo = targetObjectIsInMagneticFieldOf
cancelAnimations()
magnetListener.onStuckToTarget(targetObjectIsInMagneticFieldOf!!)
animateStuckToTarget(targetObjectIsInMagneticFieldOf, velX, velY, false, null)
vibrateIfEnabled(VibrationEffect.EFFECT_HEAVY_CLICK)
}
//省略
return objectStuckToTarget // Always consume touch events if the object is stuck.
}
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