Activity页面的绘制流程，android开发框架控件主题
View decor = r.window.getDecorView();
decor.setVisibility(View.INVISIBLE);
2.获取WindowManagerImpl对象
ViewManager wm = a.getWindowManager();
WindowManager.LayoutParams l = r.window.getAttributes();
a.mDecor = decor;
l.type = WindowManager.LayoutParams.TYPE_BASE_APPLICATION;
l.softInputMode |= forwardBit;
if (r.mPreserveWindow) {
a.mWindowAdded = true;
r.mPreserveWindow = false;
// Normally the ViewRoot sets up callbacks with the Activity
// in addView->ViewRootImpl#setView. If we are instead reusing
// the decor view we have to notify the view root that the
// callbacks may have changed.
ViewRootImpl impl = decor.getViewRootImpl();
if (impl != null) {
impl.notifyChildRebuilt();
}
}
if (a.mVisibleFromClient) {
if (!a.mWindowAdded) {
a.mWindowAdded = true;
3.调用WindowManagerImpl的addView方法
wm.addView(decor, l);
}
…
}
…
}
…
}
1.我们先来看看注释1
跟一下它的源码，代码只贴主要流程的，有兴趣的朋友可以自己去查看详细的。
@VisibleForTesting
public ActivityClientRecord performResumeActivity(IBinder token, boolean finalStateRequest,
String reason) {
//省略部分代码
…
…
final ActivityClientRecord r = mActivities.get(token);
//省略部分代码
…
…
//调用Activity的performResume方法
r.activity.performResume(r.startsNotResumed, reason);
return r;
}
final void performResume(boolean followedByPause, String reason) {
//省略部分代码
…
…
//调用Instrumentation的callActivityOnResume方法
mInstrumentation.callActivityOnResume(this);
//省略部分代码
…
…
}
public void callActivityOnResume(Activity activity) {
activity.mResumed = true;
//调用Activity的onResume
activity.onResume();
if (mActivityMonitors != null) {
synchronized (mSync) {
final int N = mActivityMonitors.size();
for (int i=0; i final ActivityMonitor am = mActivityMonitors.get(i); am.match(activity, activity, activity.getIntent()); } } } } 上面我们跟了一下performResumeActivity的源码，发现最后调用了Activity的onResume，由此我们可以知道在注释一的时候，Activity的onResume方法其实已经执行完成了，但是我们的界面绘制还没有开始呢，印证了我们开头说的。 2.下面我们来看看注释2这个wm到底是个什么东西呢，看看