做的好的中医网站,网站建设评估体系,互联网域名注册查询,创意设计文案Android14 WMS-窗口添加流程(一)-Client端-CSDN博客
Android14 WMS-窗口添加流程(二)-Server端-CSDN博客
经过上述两个流程后#xff0c;窗口的信息都已经传入了WMS端。 1. ViewRootImpl#setView
在窗口添加流程(一)中#xff0c;有这个方法#xff1a;
http://aospxref…Android14 WMS-窗口添加流程(一)-Client端-CSDN博客
Android14 WMS-窗口添加流程(二)-Server端-CSDN博客
经过上述两个流程后窗口的信息都已经传入了WMS端。 1. ViewRootImpl#setView
在窗口添加流程(一)中有这个方法
http://aospxref.com/android-14.0.0_r2/xref/frameworks/base/core/java/android/view/ViewRootImpl.java#1314 public void setView(View view, WindowManager.LayoutParams attrs, View panelParentView,int userId) {
...// Schedule the first layout -before- adding to the window// manager, to make sure we do the relayout before receiving// any other events from the system.requestLayout();
...}
2. ViewRootImpl#requestLayout
requestLayout中的scheduleTraversals是一个异步方法 Overridepublic void requestLayout() {if (!mHandlingLayoutInLayoutRequest) {checkThread();mLayoutRequested true;
//异步方法scheduleTraversals();}}
3. ViewRootImpl#scheduleTraversals
scheduleTraversals中有一个Runnable方法
关于Choreographer编舞者这里也不重点介绍。 final class TraversalRunnable implements Runnable {Overridepublic void run() {
//执行view遍历操作,进行measurelayoutdraw操作doTraversal();}}final TraversalRunnable mTraversalRunnable new TraversalRunnable();UnsupportedAppUsage(maxTargetSdk Build.VERSION_CODES.R, trackingBug 170729553)void scheduleTraversals() {if (!mTraversalScheduled) {mTraversalScheduled true;mTraversalBarrier mHandler.getLooper().getQueue().postSyncBarrier();
//Choreographer Posts a callback to run on the next frame.
// The callback runs once then is automatically removed.mChoreographer.postCallback(Choreographer.CALLBACK_TRAVERSAL, mTraversalRunnable, null);notifyRendererOfFramePending();pokeDrawLockIfNeeded();}}
4. ViewRootImpl#doTraversal
来看看Runnable中的方法
void doTraversal() {if (mTraversalScheduled) {mTraversalScheduled false;mHandler.getLooper().getQueue().removeSyncBarrier(mTraversalBarrier);
...
//要执行到了真正的遍历操作这就要对view执行measurelayout, draw流程了performTraversals();
...}}
5. ViewRootImpl#performTraversals private void performTraversals() {
...// cache mView since it is used so much below...
//这个mView是通过setView方法传进来的,也就是Activity的根布局DecorView使用final修饰以防在遍历过程中被修改final View host mView;
...
//mAdded指DecorView是否被成功加入到window中在setView()中被赋值为trueif (host null || !mAdded) {mLastPerformTraversalsSkipDrawReason host null ? no_host : not_added;return;}
...mIsInTraversal true;//是否正在遍历mWillDrawSoon true;//是否需要马上绘制boolean cancelDraw false;String cancelReason null;boolean isSyncRequest false;boolean windowSizeMayChange false;WindowManager.LayoutParams lp mWindowAttributes;
//顶层视图DecorView窗口的期望宽高int desiredWindowWidth;int desiredWindowHeight;
//DecorView是否可见final int viewVisibility getHostVisibility();
//视图可见性改变final boolean viewVisibilityChanged !mFirst (mViewVisibility ! viewVisibility || mNewSurfaceNeeded// Also check for possible double visibility update, which will make current// viewVisibility value equal to mViewVisibility and we may miss it.|| mAppVisibilityChanged);
...WindowManager.LayoutParams params null;
...boolean windowShouldResize layoutRequested windowSizeMayChange ((mWidth ! host.getMeasuredWidth() || mHeight ! host.getMeasuredHeight())|| (lp.width ViewGroup.LayoutParams.WRAP_CONTENT frame.width() desiredWindowWidth frame.width() ! mWidth)|| (lp.height ViewGroup.LayoutParams.WRAP_CONTENT frame.height() desiredWindowHeight frame.height() ! mHeight));windowShouldResize | mDragResizing mPendingDragResizing;
...
//第一次执行测量布局绘制操作||Activity窗口大小需要改变||View的可见性发生了变化||窗口属性发生了变化||ViewRootHandler接收到消息MSG_RESIZED_REPORT即size改变了if (mFirst || windowShouldResize || viewVisibilityChanged || params ! null|| mForceNextWindowRelayout) {
...
//如果此窗口为窗口管理器提供内部insets那么我们首先要在布局期间使提供的insets保持不变。
//这样可以避免它短暂地导致其他窗口根据窗口的原始框架调整大小/移动
//等到我们完成此窗口的布局并返回窗口管理器并最终计算出插图。insetsPending computesInternalInsets;
...
//判断是否有surfaceboolean hadSurface mSurface.isValid();try {
...if (mFirst || viewVisibilityChanged) {mViewFrameInfo.flags | FrameInfo.FLAG_WINDOW_VISIBILITY_CHANGED;}
//params窗口属性变化内容
//请求WMS计算Activity窗口大小及边衬区域大小relayoutResult relayoutWindow(params, viewVisibility, insetsPending);
...// Ask host how big it wants to be//绘制三部曲之measureperformMeasure(childWidthMeasureSpec, childHeightMeasureSpec);...//绘制三部曲之layoutperformLayout(lp, mWidth, mHeight);...//绘制三部曲之drawperformDraw();
...
6. ViewRootImpl#relayoutWindow
我们主要是来看看ViewRootImpl如何向WMS申请布局的 private int relayoutWindow(WindowManager.LayoutParams params, int viewVisibility,boolean insetsPending) throws RemoteException {
...
//window申请的宽final int requestedWidth (int) (measuredWidth * appScale 0.5f);
//window申请的高final int requestedHeight (int) (measuredHeight * appScale 0.5f);int relayoutResult 0;mRelayoutSeq;if (relayoutAsync) {mWindowSession.relayoutAsync(mWindow, params,requestedWidth, requestedHeight, viewVisibility,insetsPending ? WindowManagerGlobal.RELAYOUT_INSETS_PENDING : 0, mRelayoutSeq,mLastSyncSeqId);} else {
//请求重新布局relayoutResult mWindowSession.relayout(mWindow, params,requestedWidth, requestedHeight, viewVisibility,insetsPending ? WindowManagerGlobal.RELAYOUT_INSETS_PENDING : 0, mRelayoutSeq,mLastSyncSeqId, mTmpFrames, mPendingMergedConfiguration, mSurfaceControl,mTempInsets, mTempControls, mRelayoutBundle);
...
这里就又用到了AIDLWindowSessionWindowSession是APP和WMS沟通的桥梁 final IWindowSession mWindowSession;
可以看下这篇文章加强理解
Android14 WMS-IWindowSession介绍-CSDN博客
7. Session #relayout //Session继承了IWindowSession.Stub
class Session extends IWindowSession.Stub implements IBinder.DeathRecipient {
...Overridepublic int relayout(IWindow window, WindowManager.LayoutParams attrs,int requestedWidth, int requestedHeight, int viewFlags, int flags, int seq,int lastSyncSeqId, ClientWindowFrames outFrames,MergedConfiguration mergedConfiguration, SurfaceControl outSurfaceControl,InsetsState outInsetsState, InsetsSourceControl.Array outActiveControls,Bundle outSyncSeqIdBundle) {if (false) Slog.d(TAG_WM, ENTERED relayout from Binder.getCallingPid());Trace.traceBegin(TRACE_TAG_WINDOW_MANAGER, mRelayoutTag);
//调用到了Server端int res mService.relayoutWindow(this, window, attrs,requestedWidth, requestedHeight, viewFlags, flags, seq,lastSyncSeqId, outFrames, mergedConfiguration, outSurfaceControl, outInsetsState,outActiveControls, outSyncSeqIdBundle);Trace.traceEnd(TRACE_TAG_WINDOW_MANAGER);if (false) Slog.d(TAG_WM, EXITING relayout to Binder.getCallingPid());return res;}
8. WindowManagerService #relayoutWindow
Server端流程太多了另起一篇文章分析。
