点进去会看到下图:
其中getWindow()是获取到Window类的唯一子类PhoneWindow的对象
找到PhoneWindow的setContentView
()方法点进去:
1 @Override
2 public void setContentView(int layoutResID) {
3 // Note: FEATURE_CONTENT_TRANSITIONS may be set in the process of installing the window
4 // decor, when theme attributes and the like are crystalized. Do not check the feature
5 // before this happens.
6 if (mContentParent == null) {
7 installDecor();
8 } else if (!hasFeature(FEATURE_CONTENT_TRANSITIONS)) {
9 mContentParent.removeAllViews();
10 }
11
12 if (hasFeature(FEATURE_CONTENT_TRANSITIONS)) {
13 final Scene newScene = Scene.getSceneForLayout(mContentParent, layoutResID,
14 getContext());
15 transitionTo(newScene);
16 } else {
17 mLayoutInflater.inflate(layoutResID, mContentParent);
18 }
19 mContentParent.requestApplyInsets();
20 final Callback cb = getCallback();
21 if (cb != null && !isDestroyed()) {
22 cb.onContentChanged();
23 }
24 }
从上述代码中可以看出:把我们的layoutResID放在了mContentParent里面
在类中可以看出mContentParent是一个ViewGroup
点进去查看:installDecor()方法
继续跟进:generateLayout
()方法
protected ViewGroup generateLayout(DecorView decor) {
// Apply data from current theme.
TypedArray a = getWindowStyle();
if (false) {
System.out.println("From style:");
String s = "Attrs:";
for (int i = 0; i < R.styleable.Window.length; i++) {
s = s + " " + Integer.toHexString(R.styleable.Window[i
![无标题.png](http://upload-images.jianshu.io/upload_images/4658633-9a3a758cbac9f8aa.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
]) + "="
+ a.getString(i);
}
System.out.println(s);
}
//根据style属性做一些列的判断...
//在做一些列的判断得到layoutResource
layoutResource = R.layout.screen_swipe_dismiss; //这里用R.layout.screen_simple来分析
mDecor.startChanging();
View in = mLayoutInflater.inflate(layoutResource, null);
//把layoutResource
放进decor
中去
decor.addView(in, new ViewGroup.LayoutParams(MATCH_PARENT, MATCH_PARENT));
mContentRoot = (ViewGroup) in;
ViewGroup contentParent = (ViewGroup)findViewById(ID_ANDROID_CONTENT);
if (contentParent == null) {
throw new RuntimeException("Window couldn't find content container view");
}
//......
mDecor.finishChanging();
//返回创建的这个布局
return contentParent;
}
//贴出这个布局文件
if (mDecor == null) {
mDecor = generateDecor();
mDecor.setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);
mDecor.setIsRootNamespace(true);
if (!mInvalidatePanelMenuPosted && mInvalidatePanelMenuFeatures != 0) {
mDecor.postOnAnimation(mInvalidatePanelMenuRunnable);
}
}
protected DecorView generateDecor() {
return new DecorView(getContext(), -1);
}
mDecor 就是DecorView(FragmentLayout)的一个实例
所以最终的图形就是