/i**

*We have one child*/

public voidsetView(View view, WindowManager.LayoutParams attrs, View panelParentView) {synchronized (this) {if (mView == null) {

mView=view;//获取当前屏幕最新的状态，并且给当前DecorView注册屏幕监听，用来检测灭屏和亮屏

mAttachInfo.mDisplayState =mDisplay.getState();

mDisplayManager.registerDisplayListener(mDisplayListener, mHandler);

mViewLayoutDirectionInitial=mView.getRawLayoutDirection();

mFallbackEventHandler.setView(view);

mWindowAttributes.copyFrom(attrs);if (mWindowAttributes.packageName == null) {

mWindowAttributes.packageName=mBasePackageName;

}

attrs=mWindowAttributes;//Keep track of the actual window flags supplied by the client.

mClientWindowLayoutFlags =attrs.flags;//清除辅助功能的焦点

setAccessibilityFocus(null, null);if (view instanceofRootViewSurfaceTaker) {

mSurfaceHolderCallback=((RootViewSurfaceTaker)view).willYouTakeTheSurface();if (mSurfaceHolderCallback != null) {

mSurfaceHolder= newTakenSurfaceHolder();

mSurfaceHolder.setFormat(PixelFormat.UNKNOWN);

}

}//Compute surface insets required to draw at specified Z value.//TODO: Use real shadow insets for a constant max Z.

if (!attrs.hasManualSurfaceInsets) {final int surfaceInset = (int) Math.ceil(view.getZ() * 2);

attrs.surfaceInsets.set(surfaceInset, surfaceInset, surfaceInset, surfaceInset);

}//获取屏幕兼容模式,一般情况下不考虑 mTranslator是空的

CompatibilityInfo compatibilityInfo =mDisplayAdjustments.getCompatibilityInfo();

mTranslator=compatibilityInfo.getTranslator();//开启硬件加速功能

if (mSurfaceHolder == null) {

enableHardwareAcceleration(attrs);

}boolean restore = false;//Application不考虑兼容模式

if (mTranslator != null) {

mSurface.setCompatibilityTranslator(mTranslator);

restore= true;

attrs.backup();

mTranslator.translateWindowLayout(attrs);

}if (DEBUG_LAYOUT) Log.d(TAG, "WindowLayout in setView:" +attrs);//Application不考虑兼容模式

if (!compatibilityInfo.supportsScreen()) {

attrs.privateFlags|=WindowManager.LayoutParams.PRIVATE_FLAG_COMPATIBLE_WINDOW;

mLastInCompatMode= true;

}

mSoftInputMode=attrs.softInputMode;

mWindowAttributesChanged= true;

mWindowAttributesChangesFlag=WindowManager.LayoutParams.EVERYTHING_CHANGED;

mAttachInfo.mRootView=view;

mAttachInfo.mScalingRequired= mTranslator != null;

mAttachInfo.mApplicationScale=mTranslator== null ? 1.0f: mTranslator.applicationScale;if (panelParentView != null) {

mAttachInfo.mPanelParentWindowToken=panelParentView.getApplicationWindowToken();

}

mAdded= true;int res; /*= WindowManagerImpl.ADD_OKAY;*/

//在这里开始启用绘制线程，requestLayout会触发整个的绘制过程

requestLayout();if((mWindowAttributes.inputFeatures& WindowManager.LayoutParams.INPUT_FEATURE_NO_INPUT_CHANNEL) == 0) {

mInputChannel= newInputChannel();

}try{

mOrigWindowType=mWindowAttributes.type;

mAttachInfo.mRecomputeGlobalAttributes= true;

collectViewAttributes();//mWindow是ViewRootImpl中的一个静态类，这个类可以用来和WindowSession交互，就等于间接在和WindowManagerService交互//是一个桥梁类

res =mWindowSession.addToDisplay(mWindow, mSeq, mWindowAttributes,

getHostVisibility(), mDisplay.getDisplayId(),

mAttachInfo.mContentInsets, mAttachInfo.mStableInsets,

mAttachInfo.mOutsets, mInputChannel);

}catch(RemoteException e) {

mAdded= false;

mView= null;

mAttachInfo.mRootView= null;

mInputChannel= null;

mFallbackEventHandler.setView(null);

unscheduleTraversals();

setAccessibilityFocus(null, null);throw new RuntimeException("Adding window failed", e);

}finally{if(restore) {

attrs.restore();

}

}if (mTranslator != null) {

mTranslator.translateRectInScreenToAppWindow(mAttachInfo.mContentInsets);

}

mPendingOverscanInsets.set(0, 0, 0, 0);

mPendingContentInsets.set(mAttachInfo.mContentInsets);

mPendingStableInsets.set(mAttachInfo.mStableInsets);

mPendingVisibleInsets.set(0, 0, 0, 0);if (DEBUG_LAYOUT) Log.v(TAG, "Added window " +mWindow);//在这里处理WindowManagerServices的处理结果，在这里你能看到很多熟悉的异常

if (res

mAttachInfo.mRootView= null;

mAdded= false;

mFallbackEventHandler.setView(null);

unscheduleTraversals();

setAccessibilityFocus(null, null);switch(res) {caseWindowManagerGlobal.ADD_BAD_APP_TOKEN:caseWindowManagerGlobal.ADD_BAD_SUBWINDOW_TOKEN:throw newWindowManager.BadTokenException("Unable to add window -- token " +attrs.token+ " is not valid; is your activity running?");caseWindowManagerGlobal.ADD_NOT_APP_TOKEN:throw newWindowManager.BadTokenException("Unable to add window -- token " +attrs.token+ " is not for an application");caseWindowManagerGlobal.ADD_APP_EXITING:throw newWindowManager.BadTokenException("Unable to add window -- app for token " +attrs.token+ " is exiting");caseWindowManagerGlobal.ADD_DUPLICATE_ADD:throw newWindowManager.BadTokenException("Unable to add window -- window " +mWindow+ " has already been added");caseWindowManagerGlobal.ADD_STARTING_NOT_NEEDED://Silently ignore -- we would have just removed it//right away, anyway.

return;caseWindowManagerGlobal.ADD_MULTIPLE_SINGLETON:throw newWindowManager.BadTokenException("Unable to add window " + mWindow +

" -- another window of this type already exists");caseWindowManagerGlobal.ADD_PERMISSION_DENIED:throw newWindowManager.BadTokenException("Unable to add window " + mWindow +

" -- permission denied for this window type");caseWindowManagerGlobal.ADD_INVALID_DISPLAY:throw newWindowManager.InvalidDisplayException("Unable to add window " + mWindow +

" -- the specified display can not be found");caseWindowManagerGlobal.ADD_INVALID_TYPE:throw newWindowManager.InvalidDisplayException("Unable to add window " +mWindow+ " -- the specified window type is not valid");

}throw newRuntimeException("Unable to add window -- unknown error code " +res);

}if (view instanceofRootViewSurfaceTaker) {

mInputQueueCallback=((RootViewSurfaceTaker)view).willYouTakeTheInputQueue();

}if (mInputChannel != null) {if (mInputQueueCallback != null) {

mInputQueue= newInputQueue();

mInputQueueCallback.onInputQueueCreated(mInputQueue);

}

mInputEventReceiver= newWindowInputEventReceiver(mInputChannel,

Looper.myLooper());

}//给DecorView绑定mParent参数

view.assignParent(this);

mAddedTouchMode= (res & WindowManagerGlobal.ADD_FLAG_IN_TOUCH_MODE) != 0;

mAppVisible= (res & WindowManagerGlobal.ADD_FLAG_APP_VISIBLE) != 0;//判断辅助功能是否可用

if(mAccessibilityManager.isEnabled()) {

mAccessibilityInteractionConnectionManager.ensureConnection();

}if (view.getImportantForAccessibility() ==View.IMPORTANT_FOR_ACCESSIBILITY_AUTO) {

view.setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_YES);

}//Set up the input pipeline.

CharSequence counterSuffix =attrs.getTitle();

mSyntheticInputStage= newSyntheticInputStage();

InputStage viewPostImeStage= newViewPostImeInputStage(mSyntheticInputStage);

InputStage nativePostImeStage= newNativePostImeInputStage(viewPostImeStage,"aq:native-post-ime:" +counterSuffix);

InputStage earlyPostImeStage= newEarlyPostImeInputStage(nativePostImeStage);

InputStage imeStage= newImeInputStage(earlyPostImeStage,"aq:ime:" +counterSuffix);

InputStage viewPreImeStage= newViewPreImeInputStage(imeStage);

InputStage nativePreImeStage= newNativePreImeInputStage(viewPreImeStage,"aq:native-pre-ime:" +counterSuffix);

mFirstInputStage=nativePreImeStage;

mFirstPostImeInputStage=earlyPostImeStage;

mPendingInputEventQueueLengthCounterName= "aq:pending:" +counterSuffix;

}

}

}