Android View繪製流程
首先應用啓動的時候會經過ActivityThread通知啓動第一個Activity(也就是App的第一個窗口),這個時候就已經進入了View的繪製流程了,當第一個Activity徹底啓動了以後,其它的Activity啓動的時候View的繪製流程跟這個也是同樣的.看一下下面的圖就會知道當Activity開啓的時候,View是怎麼繪製的.java
咱們能夠根據上面的處理流程,大體將整個View的繪製流程分爲三部分android
首先是建立視圖承載者,當Activity啓動了的時候,ActivityThread會經過自身Handler的handleMessage方法中的handleResumeActivity顯示咱們當前Activity中的內容,如今來看一下handleResumeActivity這個方法windows
final void handleResumeActivity(IBinder token, boolean clearHide, boolean isForward) {
...
if (r.window == null && !a.mFinished && willBeVisible) {
r.window = r.activity.getWindow();
View decor = r.window.getDecorView();
decor.setVisibility(View.INVISIBLE);
ViewManager wm = a.getWindowManager();
WindowManager.LayoutParams l = r.window.getAttributes();
a.mDecor = decor;
l.type = WindowManager.LayoutParams.TYPE_BASE_APPLICATION;
l.softInputMode |= forwardBit;
if (a.mVisibleFromClient) {
a.mWindowAdded = true;
wm.addView(decor, l);
}
// If the window has already been added, but during resume
// we started another activity, then don't yet make the // window visible. } else if (!willBeVisible) { if (localLOGV) Slog.v( TAG, "Launch " + r + " mStartedActivity set"); r.hideForNow = true; } ... } 複製代碼
這個方法咱們去除一些其餘的操做,只看當前對窗體的操做咱們會發現,其實是獲取了一個窗體管理者,其實也就是獲取了一個顯示內容的窗體,同時向其中添加第一個View,咱們第一個添加的View是DecorView,經過WindowManger來添加的,添加的流程會設計到進程間的通訊是經過Binder實現的,這裏咱們只須要知道是經過WindowManger來進行Activity的試圖管理就行.其實這裏面的WindowManger是一個接口類,具體的實現就是咱們下面第二步中的WindowManagerImpl類bash
第二步添加相應的試圖,咱們第一步中經過handleResumeActivity中addView以後作了什麼操做,咱們仍是來看一下WindowManagerImpl中的相關代碼session
public void addView(View view)
{
addView(view, new WindowManager.LayoutParams(
WindowManager.LayoutParams.TYPE_APPLICATION, 0, PixelFormat.OPAQUE));
}
public void addView(View view, ViewGroup.LayoutParams params)
{
addView(view, params, false);
}
複製代碼
咱們發現咱們第一步中調用的方法是帶有兩個參數的addView,一個參數是要添加的View另外一個參數是相關的佈局參數.以後在這個方法中會調用到三個參數的addView方法,也就是下面代碼塊中的方法.app
Android 2.2
private void addView(View view, ViewGroup.LayoutParams params, boolean nest) {
if (Config.LOGV) Log.v("WindowManager", "addView view=" + view);
if (!(params instanceof WindowManager.LayoutParams)) {
throw new IllegalArgumentException(
"Params must be WindowManager.LayoutParams");
}
final WindowManager.LayoutParams wparams
= (WindowManager.LayoutParams)params;
ViewRoot root;
View panelParentView = null;
synchronized (this) {
// Here's an odd/questionable case: if someone tries to add a
// view multiple times, then we simply bump up a nesting count
// and they need to remove the view the corresponding number of
// times to have it actually removed from the window manager.
// This is useful specifically for the notification manager,
// which can continually add/remove the same view as a
// notification gets updated.
int index = findViewLocked(view, false);
if (index >= 0) {
if (!nest) {
throw new IllegalStateException("View " + view
+ " has already been added to the window manager.");
}
root = mRoots[index];
root.mAddNesting++;
// Update layout parameters.
view.setLayoutParams(wparams);
root.setLayoutParams(wparams, true);
return;
}
// If this is a panel window, then find the window it is being
// attached to for future reference.
if (wparams.type >= WindowManager.LayoutParams.FIRST_SUB_WINDOW &&
wparams.type <= WindowManager.LayoutParams.LAST_SUB_WINDOW) {
final int count = mViews != null ? mViews.length : 0;
for (int i=0; i<count; i++) {
if (mRoots[i].mWindow.asBinder() == wparams.token) {
panelParentView = mViews[i];
}
}
}
root = new ViewRoot(view.getContext());
root.mAddNesting = 1;
view.setLayoutParams(wparams);
if (mViews == null) {
index = 1;
mViews = new View[1];
mRoots = new ViewRoot[1];
mParams = new WindowManager.LayoutParams[1];
} else {
index = mViews.length + 1;
Object[] old = mViews;
mViews = new View[index];
System.arraycopy(old, 0, mViews, 0, index-1);
old = mRoots;
mRoots = new ViewRoot[index];
System.arraycopy(old, 0, mRoots, 0, index-1);
old = mParams;
mParams = new WindowManager.LayoutParams[index];
System.arraycopy(old, 0, mParams, 0, index-1);
}
index--;
mViews[index] = view;
mRoots[index] = root;
mParams[index] = wparams;
}
// do this last because it fires off messages to start doing things
root.setView(view, wparams, panelParentView);
}
Android 7.1
public void addView(View view, ViewGroup.LayoutParams params, Display display, Window parentWindow) {
if (view == null) {
throw new IllegalArgumentException("view must not be null");
}
if (display == null) {
throw new IllegalArgumentException("display must not be null");
}
if (!(params instanceof WindowManager.LayoutParams)) {
throw new IllegalArgumentException("Params must be WindowManager.LayoutParams");
}
final WindowManager.LayoutParams wparams = (WindowManager.LayoutParams) params;
if (parentWindow != null) {
parentWindow.adjustLayoutParamsForSubWindow(wparams);
} else {
// If there's no parent, then hardware acceleration for this view is
// set from the application's hardware acceleration setting.
final Context context = view.getContext();
if (context != null
&& (context.getApplicationInfo().flags
& ApplicationInfo.FLAG_HARDWARE_ACCELERATED) != 0) {
wparams.flags |= WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED;
}
}
ViewRootImpl root;
View panelParentView = null;
synchronized (mLock) {
// Start watching for system property changes.
if (mSystemPropertyUpdater == null) {
mSystemPropertyUpdater = new Runnable() {
@Override public void run() {
synchronized (mLock) {
for (int i = mRoots.size() - 1; i >= 0; --i) {
mRoots.get(i).loadSystemProperties();
}
}
}
};
SystemProperties.addChangeCallback(mSystemPropertyUpdater);
}
int index = findViewLocked(view, false);
if (index >= 0) {
if (mDyingViews.contains(view)) {
// Don't wait for MSG_DIE to make it's way through root's queue.
mRoots.get(index).doDie();
} else {
throw new IllegalStateException("View " + view
+ " has already been added to the window manager.");
}
// The previous removeView() had not completed executing. Now it has.
}
// If this is a panel window, then find the window it is being
// attached to for future reference.
if (wparams.type >= WindowManager.LayoutParams.FIRST_SUB_WINDOW &&
wparams.type <= WindowManager.LayoutParams.LAST_SUB_WINDOW) {
final int count = mViews.size();
for (int i = 0; i < count; i++) {
if (mRoots.get(i).mWindow.asBinder() == wparams.token) {
panelParentView = mViews.get(i);
}
}
}
root = new ViewRootImpl(view.getContext(), display);
view.setLayoutParams(wparams);
mViews.add(view);
mRoots.add(root);
mParams.add(wparams);
}
// do this last because it fires off messages to start doing things
try {
root.setView(view, wparams, panelParentView);
} catch (RuntimeException e) {
// BadTokenException or InvalidDisplayException, clean up.
synchronized (mLock) {
final int index = findViewLocked(view, false);
if (index >= 0) {
removeViewLocked(index, true);
}
}
throw e;
}
}
複製代碼
從上面的方法中咱們能夠看出,實際上再向窗體中添加View的時候要用到ViewRoot和ViewRootImpl這兩個類.那麼實際上咱們來找一下這兩個類的相同的地方ide
2.2
public final class ViewRoot extends Handler implements ViewParent,
View.AttachInfo.Callbacks {
public void setView(View view, WindowManager.LayoutParams attrs,
View panelParentView) {
synchronized (this) {
....
// 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();
....
}
7.1
public final class ViewRootImpl implements ViewParent,
View.AttachInfo.Callbacks, HardwareRenderer.HardwareDrawCallbacks
public void setView(View view, WindowManager.LayoutParams attrs, View panelParentView) {
synchronized (this) {
...
// 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();
...
}
複製代碼
根據上面的代碼咱們能夠看到,這個兩個類雖然名字不一樣可是這兩個類同時實現了ViewParent這個接口,同時這兩個類的setView方法同時都調用了requestLayout()這個方法,那麼咱們就猜想一下是否是這個方法纔是View繪製的觸發點呢,實際上就是這裏進行View相應的繪製.這也是咱們View繪製流程的第三步.oop
第三步執行View樹的繪製,前兩步爲咱們繪製整個View作了充足的準備,承載View的窗體已經被建立,而且向裏面添加了能夠顯示View的DecorView,接下來Android系統就要根據咱們想要顯示的View進行相關的視圖繪製了,咱們看一下代碼佈局
//當發生更改時調用，該更改已使該視圖父的子佈局無效。這將安排視圖樹進行從新的佈局
@Override
public void requestLayout() {
if (!mHandlingLayoutInLayoutRequest) {
checkThread();
mLayoutRequested = true;
//執行遍歷
scheduleTraversals();
}
}
Android 7.1
void scheduleTraversals() {
if (!mTraversalScheduled) {
mTraversalScheduled = true;
mTraversalBarrier = mHandler.getLooper().getQueue().postSyncBarrier();
//添加一個Runable對象,這個Runbale對象是爲了進行繪製的測量以及佈局的
mChoreographer.postCallback(
Choreographer.CALLBACK_TRAVERSAL, mTraversalRunnable, null);
if (!mUnbufferedInputDispatch) {
scheduleConsumeBatchedInput();
}
notifyRendererOfFramePending();
pokeDrawLockIfNeeded();
}
}
final class TraversalRunnable implements Runnable {
@Override
public void run() {
doTraversal();
}
}
void doTraversal() {
if (mTraversalScheduled) {
mTraversalScheduled = false;
mHandler.getLooper().getQueue().removeSyncBarrier(mTraversalBarrier);
if (mProfile) {
Debug.startMethodTracing("ViewAncestor");
}
performTraversals();
if (mProfile) {
Debug.stopMethodTracing();
mProfile = false;
}
}
}
Android 2.2 public void scheduleTraversals() {
if (!mTraversalScheduled) {
mTraversalScheduled = true;
sendEmptyMessage(DO_TRAVERSAL);
}
}
public void handleMessage(Message msg) {
case DO_TRAVERSAL:
if (mProfile) {
Debug.startMethodTracing("ViewRoot");
}
performTraversals();
if (mProfile) {
Debug.stopMethodTracing();
mProfile = false;
}
break;
}
複製代碼
從上面的代碼咱們能夠看到,雖然不一樣的Android系統調用的方式有些不一樣,可是實際上調用的內容仍是差很少的,根據requestLayout調用scheduleTraversals進入佈局的遍歷過程,以後滴啊用performTraversals經過遍歷執行對全部要顯示的View來進行相關的測量以及排版.這樣整個View的繪製流程就完成了.最後附上perfromTraversals的相關代碼.post
Android 2.2
private void performTraversals() {
// cache mView since it is used so much below...
final View host = mView;
if (DBG) {
System.out.println("======================================");
System.out.println("performTraversals");
host.debug();
}
if (host == null || !mAdded)
return;
mTraversalScheduled = false;
mWillDrawSoon = true;
boolean windowResizesToFitContent = false;
boolean fullRedrawNeeded = mFullRedrawNeeded;
boolean newSurface = false;
WindowManager.LayoutParams lp = mWindowAttributes;
int desiredWindowWidth;
int desiredWindowHeight;
int childWidthMeasureSpec;
int childHeightMeasureSpec;
final View.AttachInfo attachInfo = mAttachInfo;
final int viewVisibility = getHostVisibility();
boolean viewVisibilityChanged = mViewVisibility != viewVisibility
|| mNewSurfaceNeeded;
float appScale = mAttachInfo.mApplicationScale;
WindowManager.LayoutParams params = null;
if (mWindowAttributesChanged) {
mWindowAttributesChanged = false;
params = lp;
}
Rect frame = mWinFrame;
if (mFirst) {
fullRedrawNeeded = true;
mLayoutRequested = true;
DisplayMetrics packageMetrics =
mView.getContext().getResources().getDisplayMetrics();
desiredWindowWidth = packageMetrics.widthPixels;
desiredWindowHeight = packageMetrics.heightPixels;
// For the very first time, tell the view hierarchy that it
// is attached to the window. Note that at this point the surface
// object is not initialized to its backing store, but soon it
// will be (assuming the window is visible).
attachInfo.mSurface = mSurface;
attachInfo.mTranslucentWindow = lp.format != PixelFormat.OPAQUE;
attachInfo.mHasWindowFocus = false;
attachInfo.mWindowVisibility = viewVisibility;
attachInfo.mRecomputeGlobalAttributes = false;
attachInfo.mKeepScreenOn = false;
viewVisibilityChanged = false;
mLastConfiguration.setTo(host.getResources().getConfiguration());
host.dispatchAttachedToWindow(attachInfo, 0);
//Log.i(TAG, "Screen on initialized: " + attachInfo.mKeepScreenOn);
} else {
desiredWindowWidth = frame.width();
desiredWindowHeight = frame.height();
if (desiredWindowWidth != mWidth || desiredWindowHeight != mHeight) {
if (DEBUG_ORIENTATION) Log.v("ViewRoot",
"View " + host + " resized to: " + frame);
fullRedrawNeeded = true;
mLayoutRequested = true;
windowResizesToFitContent = true;
}
}
if (viewVisibilityChanged) {
attachInfo.mWindowVisibility = viewVisibility;
host.dispatchWindowVisibilityChanged(viewVisibility);
if (viewVisibility != View.VISIBLE || mNewSurfaceNeeded) {
if (mUseGL) {
destroyGL();
}
}
if (viewVisibility == View.GONE) {
// After making a window gone, we will count it as being
// shown for the first time the next time it gets focus.
mHasHadWindowFocus = false;
}
}
boolean insetsChanged = false;
if (mLayoutRequested) {
// Execute enqueued actions on every layout in case a view that was detached
// enqueued an action after being detached
getRunQueue().executeActions(attachInfo.mHandler);
if (mFirst) {
host.fitSystemWindows(mAttachInfo.mContentInsets);
// make sure touch mode code executes by setting cached value
// to opposite of the added touch mode.
mAttachInfo.mInTouchMode = !mAddedTouchMode;
ensureTouchModeLocally(mAddedTouchMode);
} else {
if (!mAttachInfo.mContentInsets.equals(mPendingContentInsets)) {
mAttachInfo.mContentInsets.set(mPendingContentInsets);
host.fitSystemWindows(mAttachInfo.mContentInsets);
insetsChanged = true;
if (DEBUG_LAYOUT) Log.v(TAG, "Content insets changing to: "
+ mAttachInfo.mContentInsets);
}
if (!mAttachInfo.mVisibleInsets.equals(mPendingVisibleInsets)) {
mAttachInfo.mVisibleInsets.set(mPendingVisibleInsets);
if (DEBUG_LAYOUT) Log.v(TAG, "Visible insets changing to: "
+ mAttachInfo.mVisibleInsets);
}
if (lp.width == ViewGroup.LayoutParams.WRAP_CONTENT
|| lp.height == ViewGroup.LayoutParams.WRAP_CONTENT) {
windowResizesToFitContent = true;
DisplayMetrics packageMetrics =
mView.getContext().getResources().getDisplayMetrics();
desiredWindowWidth = packageMetrics.widthPixels;
desiredWindowHeight = packageMetrics.heightPixels;
}
}
childWidthMeasureSpec = getRootMeasureSpec(desiredWindowWidth, lp.width);
childHeightMeasureSpec = getRootMeasureSpec(desiredWindowHeight, lp.height);
// Ask host how big it wants to be
if (DEBUG_ORIENTATION || DEBUG_LAYOUT) Log.v("ViewRoot",
"Measuring " + host + " in display " + desiredWindowWidth
+ "x" + desiredWindowHeight + "...");
//對內部的View進行測量
host.measure(childWidthMeasureSpec, childHeightMeasureSpec);
if (DBG) {
System.out.println("======================================");
System.out.println("performTraversals -- after measure");
host.debug();
}
}
if (attachInfo.mRecomputeGlobalAttributes) {
//Log.i(TAG, "Computing screen on!");
attachInfo.mRecomputeGlobalAttributes = false;
boolean oldVal = attachInfo.mKeepScreenOn;
attachInfo.mKeepScreenOn = false;
host.dispatchCollectViewAttributes(0);
if (attachInfo.mKeepScreenOn != oldVal) {
params = lp;
//Log.i(TAG, "Keep screen on changed: " + attachInfo.mKeepScreenOn);
}
}
if (mFirst || attachInfo.mViewVisibilityChanged) {
attachInfo.mViewVisibilityChanged = false;
int resizeMode = mSoftInputMode &
WindowManager.LayoutParams.SOFT_INPUT_MASK_ADJUST;
// If we are in auto resize mode, then we need to determine
// what mode to use now.
if (resizeMode == WindowManager.LayoutParams.SOFT_INPUT_ADJUST_UNSPECIFIED) {
final int N = attachInfo.mScrollContainers.size();
for (int i=0; i<N; i++) {
if (attachInfo.mScrollContainers.get(i).isShown()) {
resizeMode = WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE;
}
}
if (resizeMode == 0) {
resizeMode = WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN;
}
if ((lp.softInputMode &
WindowManager.LayoutParams.SOFT_INPUT_MASK_ADJUST) != resizeMode) {
lp.softInputMode = (lp.softInputMode &
~WindowManager.LayoutParams.SOFT_INPUT_MASK_ADJUST) |
resizeMode;
params = lp;
}
}
}
if (params != null && (host.mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) != 0) {
if (!PixelFormat.formatHasAlpha(params.format)) {
params.format = PixelFormat.TRANSLUCENT;
}
}
boolean windowShouldResize = mLayoutRequested && windowResizesToFitContent
&& ((mWidth != host.mMeasuredWidth || mHeight != host.mMeasuredHeight)
|| (lp.width == ViewGroup.LayoutParams.WRAP_CONTENT &&
frame.width() < desiredWindowWidth && frame.width() != mWidth)
|| (lp.height == ViewGroup.LayoutParams.WRAP_CONTENT &&
frame.height() < desiredWindowHeight && frame.height() != mHeight));
final boolean computesInternalInsets =
attachInfo.mTreeObserver.hasComputeInternalInsetsListeners();
boolean insetsPending = false;
int relayoutResult = 0;
if (mFirst || windowShouldResize || insetsChanged
|| viewVisibilityChanged || params != null) {
if (viewVisibility == View.VISIBLE) {
// If this window is giving internal insets to the window
// manager, and it is being added or changing its visibility,
// then we want to first give the window manager "fake"
// insets to cause it to effectively ignore the content of
// the window during layout. This avoids it briefly causing
// other windows to resize/move based on the raw frame of the
// window, waiting until we can finish laying out this window
// and get back to the window manager with the ultimately
// computed insets.
insetsPending = computesInternalInsets
&& (mFirst || viewVisibilityChanged);
if (mWindowAttributes.memoryType == WindowManager.LayoutParams.MEMORY_TYPE_GPU) {
if (params == null) {
params = mWindowAttributes;
}
mGlWanted = true;
}
}
boolean initialized = false;
boolean contentInsetsChanged = false;
boolean visibleInsetsChanged;
try {
boolean hadSurface = mSurface.isValid();
int fl = 0;
if (params != null) {
fl = params.flags;
if (attachInfo.mKeepScreenOn) {
params.flags |= WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
}
}
if (DEBUG_LAYOUT) {
Log.i(TAG, "host=w:" + host.mMeasuredWidth + ", h:" +
host.mMeasuredHeight + ", params=" + params);
}
relayoutResult = relayoutWindow(params, viewVisibility, insetsPending);
if (params != null) {
params.flags = fl;
}
if (DEBUG_LAYOUT) Log.v(TAG, "relayout: frame=" + frame.toShortString()
+ " content=" + mPendingContentInsets.toShortString()
+ " visible=" + mPendingVisibleInsets.toShortString()
+ " surface=" + mSurface);
if (mPendingConfiguration.seq != 0) {
if (DEBUG_CONFIGURATION) Log.v(TAG, "Visible with new config: "
+ mPendingConfiguration);
updateConfiguration(mPendingConfiguration, !mFirst);
mPendingConfiguration.seq = 0;
}
contentInsetsChanged = !mPendingContentInsets.equals(
mAttachInfo.mContentInsets);
visibleInsetsChanged = !mPendingVisibleInsets.equals(
mAttachInfo.mVisibleInsets);
if (contentInsetsChanged) {
mAttachInfo.mContentInsets.set(mPendingContentInsets);
host.fitSystemWindows(mAttachInfo.mContentInsets);
if (DEBUG_LAYOUT) Log.v(TAG, "Content insets changing to: "
+ mAttachInfo.mContentInsets);
}
if (visibleInsetsChanged) {
mAttachInfo.mVisibleInsets.set(mPendingVisibleInsets);
if (DEBUG_LAYOUT) Log.v(TAG, "Visible insets changing to: "
+ mAttachInfo.mVisibleInsets);
}
if (!hadSurface) {
if (mSurface.isValid()) {
// If we are creating a new surface, then we need to
// completely redraw it. Also, when we get to the
// point of drawing it we will hold off and schedule
// a new traversal instead. This is so we can tell the
// window manager about all of the windows being displayed
// before actually drawing them, so it can display then
// all at once.
newSurface = true;
fullRedrawNeeded = true;
mPreviousTransparentRegion.setEmpty();
if (mGlWanted && !mUseGL) {
initializeGL();
initialized = mGlCanvas != null;
}
}
} else if (!mSurface.isValid()) {
// If the surface has been removed, then reset the scroll
// positions.
mLastScrolledFocus = null;
mScrollY = mCurScrollY = 0;
if (mScroller != null) {
mScroller.abortAnimation();
}
}
} catch (RemoteException e) {
}
if (DEBUG_ORIENTATION) Log.v(
"ViewRoot", "Relayout returned: frame=" + frame + ", surface=" + mSurface);
attachInfo.mWindowLeft = frame.left;
attachInfo.mWindowTop = frame.top;
// !!FIXME!! This next section handles the case where we did not get the
// window size we asked for. We should avoid this by getting a maximum size from
// the window session beforehand.
mWidth = frame.width();
mHeight = frame.height();
if (initialized) {
mGlCanvas.setViewport((int) (mWidth * appScale + 0.5f),
(int) (mHeight * appScale + 0.5f));
}
boolean focusChangedDueToTouchMode = ensureTouchModeLocally(
(relayoutResult&WindowManagerImpl.RELAYOUT_IN_TOUCH_MODE) != 0);
if (focusChangedDueToTouchMode || mWidth != host.mMeasuredWidth
|| mHeight != host.mMeasuredHeight || contentInsetsChanged) {
childWidthMeasureSpec = getRootMeasureSpec(mWidth, lp.width);
childHeightMeasureSpec = getRootMeasureSpec(mHeight, lp.height);
if (DEBUG_LAYOUT) Log.v(TAG, "Ooops, something changed! mWidth="
+ mWidth + " measuredWidth=" + host.mMeasuredWidth
+ " mHeight=" + mHeight
+ " measuredHeight" + host.mMeasuredHeight
+ " coveredInsetsChanged=" + contentInsetsChanged);
// Ask host how big it wants to be
host.measure(childWidthMeasureSpec, childHeightMeasureSpec);
// Implementation of weights from WindowManager.LayoutParams
// We just grow the dimensions as needed and re-measure if
// needs be
int width = host.mMeasuredWidth;
int height = host.mMeasuredHeight;
boolean measureAgain = false;
if (lp.horizontalWeight > 0.0f) {
width += (int) ((mWidth - width) * lp.horizontalWeight);
childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(width,
MeasureSpec.EXACTLY);
measureAgain = true;
}
if (lp.verticalWeight > 0.0f) {
height += (int) ((mHeight - height) * lp.verticalWeight);
childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(height,
MeasureSpec.EXACTLY);
measureAgain = true;
}
if (measureAgain) {
if (DEBUG_LAYOUT) Log.v(TAG,
"And hey let's measure once more: width=" + width
+ " height=" + height);
host.measure(childWidthMeasureSpec, childHeightMeasureSpec);
}
mLayoutRequested = true;
}
}
final boolean didLayout = mLayoutRequested;
boolean triggerGlobalLayoutListener = didLayout
|| attachInfo.mRecomputeGlobalAttributes;
if (didLayout) {
mLayoutRequested = false;
mScrollMayChange = true;
if (DEBUG_ORIENTATION || DEBUG_LAYOUT) Log.v(
"ViewRoot", "Laying out " + host + " to (" +
host.mMeasuredWidth + ", " + host.mMeasuredHeight + ")");
long startTime = 0L;
if (Config.DEBUG && ViewDebug.profileLayout) {
startTime = SystemClock.elapsedRealtime();
}
//對內部的View進行排版
host.layout(0, 0, host.mMeasuredWidth, host.mMeasuredHeight);
if (Config.DEBUG && ViewDebug.consistencyCheckEnabled) {
if (!host.dispatchConsistencyCheck(ViewDebug.CONSISTENCY_LAYOUT)) {
throw new IllegalStateException("The view hierarchy is an inconsistent state,"
+ "please refer to the logs with the tag "
+ ViewDebug.CONSISTENCY_LOG_TAG + " for more infomation.");
}
}
if (Config.DEBUG && ViewDebug.profileLayout) {
EventLog.writeEvent(60001, SystemClock.elapsedRealtime() - startTime);
}
// By this point all views have been sized and positionned
// We can compute the transparent area
if ((host.mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) != 0) {
// start out transparent
// TODO: AVOID THAT CALL BY CACHING THE RESULT?
host.getLocationInWindow(mTmpLocation);
mTransparentRegion.set(mTmpLocation[0], mTmpLocation[1],
mTmpLocation[0] + host.mRight - host.mLeft,
mTmpLocation[1] + host.mBottom - host.mTop);
host.gatherTransparentRegion(mTransparentRegion);
if (mTranslator != null) {
mTranslator.translateRegionInWindowToScreen(mTransparentRegion);
}
if (!mTransparentRegion.equals(mPreviousTransparentRegion)) {
mPreviousTransparentRegion.set(mTransparentRegion);
// reconfigure window manager
try {
sWindowSession.setTransparentRegion(mWindow, mTransparentRegion);
} catch (RemoteException e) {
}
}
}
if (DBG) {
System.out.println("======================================");
System.out.println("performTraversals -- after setFrame");
host.debug();
}
}
if (triggerGlobalLayoutListener) {
attachInfo.mRecomputeGlobalAttributes = false;
attachInfo.mTreeObserver.dispatchOnGlobalLayout();
}
if (computesInternalInsets) {
ViewTreeObserver.InternalInsetsInfo insets = attachInfo.mGivenInternalInsets;
final Rect givenContent = attachInfo.mGivenInternalInsets.contentInsets;
final Rect givenVisible = attachInfo.mGivenInternalInsets.visibleInsets;
givenContent.left = givenContent.top = givenContent.right
= givenContent.bottom = givenVisible.left = givenVisible.top
= givenVisible.right = givenVisible.bottom = 0;
attachInfo.mTreeObserver.dispatchOnComputeInternalInsets(insets);
Rect contentInsets = insets.contentInsets;
Rect visibleInsets = insets.visibleInsets;
if (mTranslator != null) {
contentInsets = mTranslator.getTranslatedContentInsets(contentInsets);
visibleInsets = mTranslator.getTranslatedVisbileInsets(visibleInsets);
}
if (insetsPending || !mLastGivenInsets.equals(insets)) {
mLastGivenInsets.set(insets);
try {
sWindowSession.setInsets(mWindow, insets.mTouchableInsets,
contentInsets, visibleInsets);
} catch (RemoteException e) {
}
}
}
if (mFirst) {
// handle first focus request
if (DEBUG_INPUT_RESIZE) Log.v(TAG, "First: mView.hasFocus()="
+ mView.hasFocus());
if (mView != null) {
if (!mView.hasFocus()) {
mView.requestFocus(View.FOCUS_FORWARD);
mFocusedView = mRealFocusedView = mView.findFocus();
if (DEBUG_INPUT_RESIZE) Log.v(TAG, "First: requested focused view="
+ mFocusedView);
} else {
mRealFocusedView = mView.findFocus();
if (DEBUG_INPUT_RESIZE) Log.v(TAG, "First: existing focused view="
+ mRealFocusedView);
}
}
}
mFirst = false;
mWillDrawSoon = false;
mNewSurfaceNeeded = false;
mViewVisibility = viewVisibility;
if (mAttachInfo.mHasWindowFocus) {
final boolean imTarget = WindowManager.LayoutParams
.mayUseInputMethod(mWindowAttributes.flags);
if (imTarget != mLastWasImTarget) {
mLastWasImTarget = imTarget;
InputMethodManager imm = InputMethodManager.peekInstance();
if (imm != null && imTarget) {
imm.startGettingWindowFocus(mView);
imm.onWindowFocus(mView, mView.findFocus(),
mWindowAttributes.softInputMode,
!mHasHadWindowFocus, mWindowAttributes.flags);
}
}
}
boolean cancelDraw = attachInfo.mTreeObserver.dispatchOnPreDraw();
if (!cancelDraw && !newSurface) {
mFullRedrawNeeded = false;
draw(fullRedrawNeeded);
if ((relayoutResult&WindowManagerImpl.RELAYOUT_FIRST_TIME) != 0
|| mReportNextDraw) {
if (LOCAL_LOGV) {
Log.v("ViewRoot", "FINISHED DRAWING: " + mWindowAttributes.getTitle());
}
mReportNextDraw = false;
try {
sWindowSession.finishDrawing(mWindow);
} catch (RemoteException e) {
}
}
} else {
// We were supposed to report when we are done drawing. Since we canceled the
// draw, remember it here.
if ((relayoutResult&WindowManagerImpl.RELAYOUT_FIRST_TIME) != 0) {
mReportNextDraw = true;
}
if (fullRedrawNeeded) {
mFullRedrawNeeded = true;
}
// Try again 從新執行繪製流程
scheduleTraversals();
}
}
Android 7.1private void performTraversals() {
// cache mView since it is used so much below...
final View host = mView;
if (DBG) {
System.out.println("======================================");
System.out.println("performTraversals");
host.debug();
}
if (host == null || !mAdded)
return;
mIsInTraversal = true;
mWillDrawSoon = true;
boolean windowSizeMayChange = false;
boolean newSurface = false;
boolean surfaceChanged = false;
WindowManager.LayoutParams lp = mWindowAttributes;
int desiredWindowWidth;
int desiredWindowHeight;
final int viewVisibility = getHostVisibility();
boolean viewVisibilityChanged = mViewVisibility != viewVisibility
|| mNewSurfaceNeeded;
WindowManager.LayoutParams params = null;
if (mWindowAttributesChanged) {
mWindowAttributesChanged = false;
surfaceChanged = true;
params = lp;
}
CompatibilityInfo compatibilityInfo = mDisplayAdjustments.getCompatibilityInfo();
if (compatibilityInfo.supportsScreen() == mLastInCompatMode) {
params = lp;
mFullRedrawNeeded = true;
mLayoutRequested = true;
if (mLastInCompatMode) {
params.privateFlags &= ~WindowManager.LayoutParams.PRIVATE_FLAG_COMPATIBLE_WINDOW;
mLastInCompatMode = false;
} else {
params.privateFlags |= WindowManager.LayoutParams.PRIVATE_FLAG_COMPATIBLE_WINDOW;
mLastInCompatMode = true;
}
}
mWindowAttributesChangesFlag = 0;
Rect frame = mWinFrame;
if (mFirst) {
mFullRedrawNeeded = true;
mLayoutRequested = true;
if (lp.type == WindowManager.LayoutParams.TYPE_STATUS_BAR_PANEL
|| lp.type == WindowManager.LayoutParams.TYPE_INPUT_METHOD) {
// NOTE -- system code, won't try to do compat mode. Point size = new Point(); mDisplay.getRealSize(size); desiredWindowWidth = size.x; desiredWindowHeight = size.y; } else { DisplayMetrics packageMetrics = mView.getContext().getResources().getDisplayMetrics(); desiredWindowWidth = packageMetrics.widthPixels; desiredWindowHeight = packageMetrics.heightPixels; } // We used to use the following condition to choose 32 bits drawing caches: // PixelFormat.hasAlpha(lp.format) || lp.format == PixelFormat.RGBX_8888 // However, windows are now always 32 bits by default, so choose 32 bits mAttachInfo.mUse32BitDrawingCache = true; mAttachInfo.mHasWindowFocus = false; mAttachInfo.mWindowVisibility = viewVisibility; mAttachInfo.mRecomputeGlobalAttributes = false; viewVisibilityChanged = false; mLastConfiguration.setTo(host.getResources().getConfiguration()); mLastSystemUiVisibility = mAttachInfo.mSystemUiVisibility; // Set the layout direction if it has not been set before (inherit is the default) if (mViewLayoutDirectionInitial == View.LAYOUT_DIRECTION_INHERIT) { host.setLayoutDirection(mLastConfiguration.getLayoutDirection()); } host.dispatchAttachedToWindow(mAttachInfo, 0); mAttachInfo.mTreeObserver.dispatchOnWindowAttachedChange(true); dispatchApplyInsets(host); //Log.i(TAG, "Screen on initialized: " + attachInfo.mKeepScreenOn); } else { desiredWindowWidth = frame.width(); desiredWindowHeight = frame.height(); if (desiredWindowWidth != mWidth || desiredWindowHeight != mHeight) { if (DEBUG_ORIENTATION) Log.v(TAG, "View " + host + " resized to: " + frame); mFullRedrawNeeded = true; mLayoutRequested = true; windowSizeMayChange = true; } } if (viewVisibilityChanged) { mAttachInfo.mWindowVisibility = viewVisibility; host.dispatchWindowVisibilityChanged(viewVisibility); if (viewVisibility != View.VISIBLE || mNewSurfaceNeeded) { destroyHardwareResources(); } if (viewVisibility == View.GONE) { // After making a window gone, we will count it as being // shown for the first time the next time it gets focus. mHasHadWindowFocus = false; } } // Non-visible windows can't hold accessibility focus.
if (mAttachInfo.mWindowVisibility != View.VISIBLE) {
host.clearAccessibilityFocus();
}
// Execute enqueued actions on every traversal in case a detached view enqueued an action
getRunQueue().executeActions(mAttachInfo.mHandler);
boolean insetsChanged = false;
boolean layoutRequested = mLayoutRequested && (!mStopped || mReportNextDraw);
if (layoutRequested) {
final Resources res = mView.getContext().getResources();
if (mFirst) {
// make sure touch mode code executes by setting cached value
// to opposite of the added touch mode.
mAttachInfo.mInTouchMode = !mAddedTouchMode;
ensureTouchModeLocally(mAddedTouchMode);
} else {
if (!mPendingOverscanInsets.equals(mAttachInfo.mOverscanInsets)) {
insetsChanged = true;
}
if (!mPendingContentInsets.equals(mAttachInfo.mContentInsets)) {
insetsChanged = true;
}
if (!mPendingStableInsets.equals(mAttachInfo.mStableInsets)) {
insetsChanged = true;
}
if (!mPendingVisibleInsets.equals(mAttachInfo.mVisibleInsets)) {
mAttachInfo.mVisibleInsets.set(mPendingVisibleInsets);
if (DEBUG_LAYOUT) Log.v(TAG, "Visible insets changing to: "
+ mAttachInfo.mVisibleInsets);
}
if (!mPendingOutsets.equals(mAttachInfo.mOutsets)) {
insetsChanged = true;
}
if (lp.width == ViewGroup.LayoutParams.WRAP_CONTENT
|| lp.height == ViewGroup.LayoutParams.WRAP_CONTENT) {
windowSizeMayChange = true;
if (lp.type == WindowManager.LayoutParams.TYPE_STATUS_BAR_PANEL
|| lp.type == WindowManager.LayoutParams.TYPE_INPUT_METHOD) {
// NOTE -- system code, won't try to do compat mode. Point size = new Point(); mDisplay.getRealSize(size); desiredWindowWidth = size.x; desiredWindowHeight = size.y; } else { DisplayMetrics packageMetrics = res.getDisplayMetrics(); desiredWindowWidth = packageMetrics.widthPixels; desiredWindowHeight = packageMetrics.heightPixels; } } } // Ask host how big it wants to be windowSizeMayChange |= measureHierarchy(host, lp, res, desiredWindowWidth, desiredWindowHeight); } if (collectViewAttributes()) { params = lp; } if (mAttachInfo.mForceReportNewAttributes) { mAttachInfo.mForceReportNewAttributes = false; params = lp; } if (mFirst || mAttachInfo.mViewVisibilityChanged) { mAttachInfo.mViewVisibilityChanged = false; int resizeMode = mSoftInputMode & WindowManager.LayoutParams.SOFT_INPUT_MASK_ADJUST; // If we are in auto resize mode, then we need to determine // what mode to use now. if (resizeMode == WindowManager.LayoutParams.SOFT_INPUT_ADJUST_UNSPECIFIED) { final int N = mAttachInfo.mScrollContainers.size(); for (int i=0; i<N; i++) { if (mAttachInfo.mScrollContainers.get(i).isShown()) { resizeMode = WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE; } } if (resizeMode == 0) { resizeMode = WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN; } if ((lp.softInputMode & WindowManager.LayoutParams.SOFT_INPUT_MASK_ADJUST) != resizeMode) { lp.softInputMode = (lp.softInputMode & ~WindowManager.LayoutParams.SOFT_INPUT_MASK_ADJUST) | resizeMode; params = lp; } } } if (params != null) { if ((host.mPrivateFlags & View.PFLAG_REQUEST_TRANSPARENT_REGIONS) != 0) { if (!PixelFormat.formatHasAlpha(params.format)) { params.format = PixelFormat.TRANSLUCENT; } } mAttachInfo.mOverscanRequested = (params.flags & WindowManager.LayoutParams.FLAG_LAYOUT_IN_OVERSCAN) != 0; } if (mApplyInsetsRequested) { mApplyInsetsRequested = false; mLastOverscanRequested = mAttachInfo.mOverscanRequested; dispatchApplyInsets(host); if (mLayoutRequested) { // Short-circuit catching a new layout request here, so // we don't need to go through two layout passes when things
// change due to fitting system windows, which can happen a lot.
windowSizeMayChange |= measureHierarchy(host, lp,
mView.getContext().getResources(),
desiredWindowWidth, desiredWindowHeight);
}
}
if (layoutRequested) {
// Clear this now, so that if anything requests a layout in the
// rest of this function we will catch it and re-run a full
// layout pass.
mLayoutRequested = false;
}
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));
// Determine whether to compute insets.
// If there are no inset listeners remaining then we may still need to compute
// insets in case the old insets were non-empty and must be reset.
final boolean computesInternalInsets =
mAttachInfo.mTreeObserver.hasComputeInternalInsetsListeners()
|| mAttachInfo.mHasNonEmptyGivenInternalInsets;
boolean insetsPending = false;
int relayoutResult = 0;
if (mFirst || windowShouldResize || insetsChanged ||
viewVisibilityChanged || params != null) {
if (viewVisibility == View.VISIBLE) {
// If this window is giving internal insets to the window
// manager, and it is being added or changing its visibility,
// then we want to first give the window manager "fake"
// insets to cause it to effectively ignore the content of
// the window during layout. This avoids it briefly causing
// other windows to resize/move based on the raw frame of the
// window, waiting until we can finish laying out this window
// and get back to the window manager with the ultimately
// computed insets.
insetsPending = computesInternalInsets && (mFirst || viewVisibilityChanged);
}
if (mSurfaceHolder != null) {
mSurfaceHolder.mSurfaceLock.lock();
mDrawingAllowed = true;
}
boolean hwInitialized = false;
boolean contentInsetsChanged = false;
boolean hadSurface = mSurface.isValid();
try {
if (DEBUG_LAYOUT) {
Log.i(TAG, "host=w:" + host.getMeasuredWidth() + ", h:" +
host.getMeasuredHeight() + ", params=" + params);
}
if (mAttachInfo.mHardwareRenderer != null) {
// relayoutWindow may decide to destroy mSurface. As that decision
// happens in WindowManager service, we need to be defensive here
// and stop using the surface in case it gets destroyed.
if (mAttachInfo.mHardwareRenderer.pauseSurface(mSurface)) {
// Animations were running so we need to push a frame
// to resume them
mDirty.set(0, 0, mWidth, mHeight);
}
mChoreographer.mFrameInfo.addFlags(FrameInfo.FLAG_WINDOW_LAYOUT_CHANGED);
}
final int surfaceGenerationId = mSurface.getGenerationId();
relayoutResult = relayoutWindow(params, viewVisibility, insetsPending);
if (DEBUG_LAYOUT) Log.v(TAG, "relayout: frame=" + frame.toShortString()
+ " overscan=" + mPendingOverscanInsets.toShortString()
+ " content=" + mPendingContentInsets.toShortString()
+ " visible=" + mPendingVisibleInsets.toShortString()
+ " visible=" + mPendingStableInsets.toShortString()
+ " outsets=" + mPendingOutsets.toShortString()
+ " surface=" + mSurface);
if (mPendingConfiguration.seq != 0) {
if (DEBUG_CONFIGURATION) Log.v(TAG, "Visible with new config: "
+ mPendingConfiguration);
updateConfiguration(new Configuration(mPendingConfiguration), !mFirst);
mPendingConfiguration.seq = 0;
}
final boolean overscanInsetsChanged = !mPendingOverscanInsets.equals(
mAttachInfo.mOverscanInsets);
contentInsetsChanged = !mPendingContentInsets.equals(
mAttachInfo.mContentInsets);
final boolean visibleInsetsChanged = !mPendingVisibleInsets.equals(
mAttachInfo.mVisibleInsets);
final boolean stableInsetsChanged = !mPendingStableInsets.equals(
mAttachInfo.mStableInsets);
final boolean outsetsChanged = !mPendingOutsets.equals(mAttachInfo.mOutsets);
if (contentInsetsChanged) {
if (mWidth > 0 && mHeight > 0 && lp != null &&
((lp.systemUiVisibility|lp.subtreeSystemUiVisibility)
& View.SYSTEM_UI_LAYOUT_FLAGS) == 0 &&
mSurface != null && mSurface.isValid() &&
!mAttachInfo.mTurnOffWindowResizeAnim &&
mAttachInfo.mHardwareRenderer != null &&
mAttachInfo.mHardwareRenderer.isEnabled() &&
lp != null && !PixelFormat.formatHasAlpha(lp.format)
&& !mBlockResizeBuffer) {
disposeResizeBuffer();
// TODO: Again....
// if (mResizeBuffer == null) {
// mResizeBuffer = mAttachInfo.mHardwareRenderer.createDisplayListLayer(
// mWidth, mHeight);
// }
// mResizeBuffer.prepare(mWidth, mHeight, false);
// RenderNode layerRenderNode = mResizeBuffer.startRecording();
// HardwareCanvas layerCanvas = layerRenderNode.start(mWidth, mHeight);
// try {
// final int restoreCount = layerCanvas.save();
//
// int yoff;
// final boolean scrolling = mScroller != null
// && mScroller.computeScrollOffset();
// if (scrolling) {
// yoff = mScroller.getCurrY();
// mScroller.abortAnimation();
// } else {
// yoff = mScrollY;
// }
//
// layerCanvas.translate(0, -yoff);
// if (mTranslator != null) {
// mTranslator.translateCanvas(layerCanvas);
// }
//
// RenderNode renderNode = mView.mRenderNode;
// if (renderNode != null && renderNode.isValid()) {
// layerCanvas.drawDisplayList(renderNode, null,
// RenderNode.FLAG_CLIP_CHILDREN);
// } else {
// mView.draw(layerCanvas);
// }
//
// drawAccessibilityFocusedDrawableIfNeeded(layerCanvas);
//
// mResizeBufferStartTime = SystemClock.uptimeMillis();
// mResizeBufferDuration = mView.getResources().getInteger(
// com.android.internal.R.integer.config_mediumAnimTime);
//
// layerCanvas.restoreToCount(restoreCount);
// layerRenderNode.end(layerCanvas);
// layerRenderNode.setCaching(true);
// layerRenderNode.setLeftTopRightBottom(0, 0, mWidth, mHeight);
// mTempRect.set(0, 0, mWidth, mHeight);
// } finally {
// mResizeBuffer.endRecording(mTempRect);
// }
// mAttachInfo.mHardwareRenderer.flushLayerUpdates();
}
mAttachInfo.mContentInsets.set(mPendingContentInsets);
if (DEBUG_LAYOUT) Log.v(TAG, "Content insets changing to: "
+ mAttachInfo.mContentInsets);
}
if (overscanInsetsChanged) {
mAttachInfo.mOverscanInsets.set(mPendingOverscanInsets);
if (DEBUG_LAYOUT) Log.v(TAG, "Overscan insets changing to: "
+ mAttachInfo.mOverscanInsets);
// Need to relayout with content insets.
contentInsetsChanged = true;
}
if (stableInsetsChanged) {
mAttachInfo.mStableInsets.set(mPendingStableInsets);
if (DEBUG_LAYOUT) Log.v(TAG, "Decor insets changing to: "
+ mAttachInfo.mStableInsets);
// Need to relayout with content insets.
contentInsetsChanged = true;
}
if (contentInsetsChanged || mLastSystemUiVisibility !=
mAttachInfo.mSystemUiVisibility || mApplyInsetsRequested
|| mLastOverscanRequested != mAttachInfo.mOverscanRequested
|| outsetsChanged) {
mLastSystemUiVisibility = mAttachInfo.mSystemUiVisibility;
mLastOverscanRequested = mAttachInfo.mOverscanRequested;
mAttachInfo.mOutsets.set(mPendingOutsets);
mApplyInsetsRequested = false;
dispatchApplyInsets(host);
}
if (visibleInsetsChanged) {
mAttachInfo.mVisibleInsets.set(mPendingVisibleInsets);
if (DEBUG_LAYOUT) Log.v(TAG, "Visible insets changing to: "
+ mAttachInfo.mVisibleInsets);
}
if (!hadSurface) {
if (mSurface.isValid()) {
// If we are creating a new surface, then we need to
// completely redraw it. Also, when we get to the
// point of drawing it we will hold off and schedule
// a new traversal instead. This is so we can tell the
// window manager about all of the windows being displayed
// before actually drawing them, so it can display then
// all at once.
newSurface = true;
mFullRedrawNeeded = true;
mPreviousTransparentRegion.setEmpty();
// Only initialize up-front if transparent regions are not
// requested, otherwise defer to see if the entire window
// will be transparent
if (mAttachInfo.mHardwareRenderer != null) {
try {
hwInitialized = mAttachInfo.mHardwareRenderer.initialize(
mSurface);
if (hwInitialized && (host.mPrivateFlags
& View.PFLAG_REQUEST_TRANSPARENT_REGIONS) == 0) {
// Don't pre-allocate if transparent regions // are requested as they may not be needed mSurface.allocateBuffers(); } } catch (OutOfResourcesException e) { handleOutOfResourcesException(e); return; } } } } else if (!mSurface.isValid()) { // If the surface has been removed, then reset the scroll // positions. if (mLastScrolledFocus != null) { mLastScrolledFocus.clear(); } mScrollY = mCurScrollY = 0; if (mView instanceof RootViewSurfaceTaker) { ((RootViewSurfaceTaker) mView).onRootViewScrollYChanged(mCurScrollY); } if (mScroller != null) { mScroller.abortAnimation(); } disposeResizeBuffer(); // Our surface is gone if (mAttachInfo.mHardwareRenderer != null && mAttachInfo.mHardwareRenderer.isEnabled()) { mAttachInfo.mHardwareRenderer.destroy(); } } else if (surfaceGenerationId != mSurface.getGenerationId() && mSurfaceHolder == null && mAttachInfo.mHardwareRenderer != null) { mFullRedrawNeeded = true; try { mAttachInfo.mHardwareRenderer.updateSurface(mSurface); } catch (OutOfResourcesException e) { handleOutOfResourcesException(e); return; } } } catch (RemoteException e) { } if (DEBUG_ORIENTATION) Log.v( TAG, "Relayout returned: frame=" + frame + ", surface=" + mSurface); mAttachInfo.mWindowLeft = frame.left; mAttachInfo.mWindowTop = frame.top; // !!FIXME!! This next section handles the case where we did not get the // window size we asked for. We should avoid this by getting a maximum size from // the window session beforehand. if (mWidth != frame.width() || mHeight != frame.height()) { mWidth = frame.width(); mHeight = frame.height(); } if (mSurfaceHolder != null) { // The app owns the surface; tell it about what is going on. if (mSurface.isValid()) { // XXX .copyFrom() doesn't work!
//mSurfaceHolder.mSurface.copyFrom(mSurface);
mSurfaceHolder.mSurface = mSurface;
}
mSurfaceHolder.setSurfaceFrameSize(mWidth, mHeight);
mSurfaceHolder.mSurfaceLock.unlock();
if (mSurface.isValid()) {
if (!hadSurface) {
mSurfaceHolder.ungetCallbacks();
mIsCreating = true;
mSurfaceHolderCallback.surfaceCreated(mSurfaceHolder);
SurfaceHolder.Callback callbacks[] = mSurfaceHolder.getCallbacks();
if (callbacks != null) {
for (SurfaceHolder.Callback c : callbacks) {
c.surfaceCreated(mSurfaceHolder);
}
}
surfaceChanged = true;
}
if (surfaceChanged) {
mSurfaceHolderCallback.surfaceChanged(mSurfaceHolder,
lp.format, mWidth, mHeight);
SurfaceHolder.Callback callbacks[] = mSurfaceHolder.getCallbacks();
if (callbacks != null) {
for (SurfaceHolder.Callback c : callbacks) {
c.surfaceChanged(mSurfaceHolder, lp.format,
mWidth, mHeight);
}
}
}
mIsCreating = false;
} else if (hadSurface) {
mSurfaceHolder.ungetCallbacks();
SurfaceHolder.Callback callbacks[] = mSurfaceHolder.getCallbacks();
mSurfaceHolderCallback.surfaceDestroyed(mSurfaceHolder);
if (callbacks != null) {
for (SurfaceHolder.Callback c : callbacks) {
c.surfaceDestroyed(mSurfaceHolder);
}
}
mSurfaceHolder.mSurfaceLock.lock();
try {
mSurfaceHolder.mSurface = new Surface();
} finally {
mSurfaceHolder.mSurfaceLock.unlock();
}
}
}
final HardwareRenderer hardwareRenderer = mAttachInfo.mHardwareRenderer;
if (hardwareRenderer != null && hardwareRenderer.isEnabled()) {
if (hwInitialized
|| mWidth != hardwareRenderer.getWidth()
|| mHeight != hardwareRenderer.getHeight()) {
hardwareRenderer.setup(mWidth, mHeight, mAttachInfo,
mWindowAttributes.surfaceInsets);
if (!hwInitialized) {
hardwareRenderer.invalidate(mSurface);
mFullRedrawNeeded = true;
}
}
}
if (!mStopped || mReportNextDraw) {
boolean focusChangedDueToTouchMode = ensureTouchModeLocally(
(relayoutResult&WindowManagerGlobal.RELAYOUT_RES_IN_TOUCH_MODE) != 0);
if (focusChangedDueToTouchMode || mWidth != host.getMeasuredWidth()
|| mHeight != host.getMeasuredHeight() || contentInsetsChanged) {
int childWidthMeasureSpec = getRootMeasureSpec(mWidth, lp.width);
int childHeightMeasureSpec = getRootMeasureSpec(mHeight, lp.height);
if (DEBUG_LAYOUT) Log.v(TAG, "Ooops, something changed! mWidth="
+ mWidth + " measuredWidth=" + host.getMeasuredWidth()
+ " mHeight=" + mHeight
+ " measuredHeight=" + host.getMeasuredHeight()
+ " coveredInsetsChanged=" + contentInsetsChanged);
// Ask host how big it wants to be
performMeasure(childWidthMeasureSpec, childHeightMeasureSpec);
// Implementation of weights from WindowManager.LayoutParams
// We just grow the dimensions as needed and re-measure if
// needs be
int width = host.getMeasuredWidth();
int height = host.getMeasuredHeight();
boolean measureAgain = false;
if (lp.horizontalWeight > 0.0f) {
width += (int) ((mWidth - width) * lp.horizontalWeight);
childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(width,
MeasureSpec.EXACTLY);
measureAgain = true;
}
if (lp.verticalWeight > 0.0f) {
height += (int) ((mHeight - height) * lp.verticalWeight);
childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(height,
MeasureSpec.EXACTLY);
measureAgain = true;
}
if (measureAgain) {
if (DEBUG_LAYOUT) Log.v(TAG,
"And hey let's measure once more: width=" + width
+ " height=" + height);
performMeasure(childWidthMeasureSpec, childHeightMeasureSpec);
}
layoutRequested = true;
}
}
} else {
// Not the first pass and no window/insets/visibility change but the window
// may have moved and we need check that and if so to update the left and right
// in the attach info. We translate only the window frame since on window move
// the window manager tells us only for the new frame but the insets are the
// same and we do not want to translate them more than once.
// TODO: Well, we are checking whether the frame has changed similarly
// to how this is done for the insets. This is however incorrect since
// the insets and the frame are translated. For example, the old frame
// was (1, 1 - 1, 1) and was translated to say (2, 2 - 2, 2), now the new
// reported frame is (2, 2 - 2, 2) which implies no change but this is not
// true since we are comparing a not translated value to a translated one.
// This scenario is rare but we may want to fix that.
final boolean windowMoved = (mAttachInfo.mWindowLeft != frame.left
|| mAttachInfo.mWindowTop != frame.top);
if (windowMoved) {
if (mTranslator != null) {
mTranslator.translateRectInScreenToAppWinFrame(frame);
}
mAttachInfo.mWindowLeft = frame.left;
mAttachInfo.mWindowTop = frame.top;
// Update the light position for the new window offsets.
if (mAttachInfo.mHardwareRenderer != null) {
mAttachInfo.mHardwareRenderer.setLightCenter(mAttachInfo);
}
}
}
final boolean didLayout = layoutRequested && (!mStopped || mReportNextDraw);
boolean triggerGlobalLayoutListener = didLayout
|| mAttachInfo.mRecomputeGlobalAttributes;
if (didLayout) {
performLayout(lp, desiredWindowWidth, desiredWindowHeight);
// By this point all views have been sized and positioned
// We can compute the transparent area
if ((host.mPrivateFlags & View.PFLAG_REQUEST_TRANSPARENT_REGIONS) != 0) {
// start out transparent
// TODO: AVOID THAT CALL BY CACHING THE RESULT?
host.getLocationInWindow(mTmpLocation);
mTransparentRegion.set(mTmpLocation[0], mTmpLocation[1],
mTmpLocation[0] + host.mRight - host.mLeft,
mTmpLocation[1] + host.mBottom - host.mTop);
host.gatherTransparentRegion(mTransparentRegion);
if (mTranslator != null) {
mTranslator.translateRegionInWindowToScreen(mTransparentRegion);
}
if (!mTransparentRegion.equals(mPreviousTransparentRegion)) {
mPreviousTransparentRegion.set(mTransparentRegion);
mFullRedrawNeeded = true;
// reconfigure window manager
try {
mWindowSession.setTransparentRegion(mWindow, mTransparentRegion);
} catch (RemoteException e) {
}
}
}
if (DBG) {
System.out.println("======================================");
System.out.println("performTraversals -- after setFrame");
host.debug();
}
}
if (triggerGlobalLayoutListener) {
mAttachInfo.mRecomputeGlobalAttributes = false;
mAttachInfo.mTreeObserver.dispatchOnGlobalLayout();
}
if (computesInternalInsets) {
// Clear the original insets.
final ViewTreeObserver.InternalInsetsInfo insets = mAttachInfo.mGivenInternalInsets;
insets.reset();
// Compute new insets in place.
mAttachInfo.mTreeObserver.dispatchOnComputeInternalInsets(insets);
mAttachInfo.mHasNonEmptyGivenInternalInsets = !insets.isEmpty();
// Tell the window manager.
if (insetsPending || !mLastGivenInsets.equals(insets)) {
mLastGivenInsets.set(insets);
// Translate insets to screen coordinates if needed.
final Rect contentInsets;
final Rect visibleInsets;
final Region touchableRegion;
if (mTranslator != null) {
contentInsets = mTranslator.getTranslatedContentInsets(insets.contentInsets);
visibleInsets = mTranslator.getTranslatedVisibleInsets(insets.visibleInsets);
touchableRegion = mTranslator.getTranslatedTouchableArea(insets.touchableRegion);
} else {
contentInsets = insets.contentInsets;
visibleInsets = insets.visibleInsets;
touchableRegion = insets.touchableRegion;
}
try {
mWindowSession.setInsets(mWindow, insets.mTouchableInsets,
contentInsets, visibleInsets, touchableRegion);
} catch (RemoteException e) {
}
}
}
boolean skipDraw = false;
if (mFirst) {
// handle first focus request
if (DEBUG_INPUT_RESIZE) Log.v(TAG, "First: mView.hasFocus()="
+ mView.hasFocus());
if (mView != null) {
if (!mView.hasFocus()) {
mView.requestFocus(View.FOCUS_FORWARD);
if (DEBUG_INPUT_RESIZE) Log.v(TAG, "First: requested focused view="
+ mView.findFocus());
} else {
if (DEBUG_INPUT_RESIZE) Log.v(TAG, "First: existing focused view="
+ mView.findFocus());
}
}
} else if (mWindowsAnimating) {
if (mRemainingFrameCount <= 0) {
skipDraw = true;
}
mRemainingFrameCount--;
}
mFirst = false;
mWillDrawSoon = false;
mNewSurfaceNeeded = false;
mViewVisibility = viewVisibility;
if (mAttachInfo.mHasWindowFocus && !isInLocalFocusMode()) {
final boolean imTarget = WindowManager.LayoutParams
.mayUseInputMethod(mWindowAttributes.flags);
if (imTarget != mLastWasImTarget) {
mLastWasImTarget = imTarget;
InputMethodManager imm = InputMethodManager.peekInstance();
if (imm != null && imTarget) {
imm.onPreWindowFocus(mView, true /* hasWindowFocus */);
imm.onPostWindowFocus(mView, mView.findFocus(),
mWindowAttributes.softInputMode,
!mHasHadWindowFocus, mWindowAttributes.flags);
}
}
}
// Remember if we must report the next draw.
if ((relayoutResult & WindowManagerGlobal.RELAYOUT_RES_FIRST_TIME) != 0) {
mReportNextDraw = true;
}
boolean cancelDraw = mAttachInfo.mTreeObserver.dispatchOnPreDraw() ||
viewVisibility != View.VISIBLE;
if (!cancelDraw && !newSurface) {
if (!skipDraw || mReportNextDraw) {
if (mPendingTransitions != null && mPendingTransitions.size() > 0) {
for (int i = 0; i < mPendingTransitions.size(); ++i) {
mPendingTransitions.get(i).startChangingAnimations();
}
mPendingTransitions.clear();
}
performDraw();
}
} else {
if (viewVisibility == View.VISIBLE) {
// Try again
scheduleTraversals();
} else if (mPendingTransitions != null && mPendingTransitions.size() > 0) {
for (int i = 0; i < mPendingTransitions.size(); ++i) {
mPendingTransitions.get(i).endChangingAnimations();
}
mPendingTransitions.clear();
}
}
mIsInTraversal = false;
}
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