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ms");
}
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);
}
}
}
//创建了一个新的ViewRootImpl对象出来
root = new ViewRootImpl(view.getContext(), display);
view.setLayoutParams(wparams);
//为当前界面保存ViewRootImpl和view还有添加的Layout参数
mViews.add(view);
mRoots.add(root);
mParams.add(wparams);
}
// do this last because it fires off messages to start doing things
try {
//调用ViewRootImpl中的setView方法，准备进行View的重绘流程，并且绘制到界面上
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;
}
}
这篇博客到这就结束了，接下来我总结下上边的流程
1.Activity初始化的时候创建了一个WindowManager对象(和系统的WindowManager服务还有点区别)
2.利用这个Activity专属的WindowManager对象请求添加一个View到当前界面上
3.WindowManager找到自己的实现类WindowManagerImpl，然后在委托给系统单例类WindowManagerGlobal处理
4.WindowManagerGlobal会创建一个ViewRootImpl对象出来
5.ViewRootImpl对象调用setView方法，然后进行界面重绘最后交给Surface进行界面展示
Ok了，很清晰的分析出了从WindowManager到ViewRootImpl的过程，接下来就可以分析ViewRootImpl.setView和ViewRootImpl的performTraversals方法了
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