ViewRootImpl和WMS交互顺序

1.获取IWindowManager代理

IWindowManager 就是一个接口，拿到代理，也就是通常的binder转接口

WindowManagerGlobal 

sWindowManagerService = IWindowManager.Stub.asInterface(
                        ServiceManager.getService("window"));

2 openSession

客户端是直接调用上面那个接口的方法。

实现是WMS里面有一个Session返回

 @Override
    public IWindowSession openSession(IWindowSessionCallback callback, IInputMethodClient client,
            IInputContext inputContext) {
        if (client == null) throw new IllegalArgumentException("null client");
        if (inputContext == null) throw new IllegalArgumentException("null inputContext");
        Session session = new Session(this, callback, client, inputContext);
        return session;
    }

final class Session extends IWindowSession.Stub

又来一个接口IWindowSession

实现类找一下IWindowSession.Stub子类就是Session

3.1  ViewRootImpl.setView

客户端获取的Session代理addView实现，客户端只能到这里

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看看binder服务端Session中addToDisplay

 @Override
    public int addToDisplay(IWindow window, int seq, WindowManager.LayoutParams attrs,
            int viewVisibility, int displayId, Rect outContentInsets,
            InputChannel outInputChannel) {
        return mService.addWindow(this, window, seq, attrs, viewVisibility, displayId,
                outContentInsets, outInputChannel);
    }

mService指的是WMS

WMS addVWindow

public int addWindow(Session session, IWindow client, int seq,
            WindowManager.LayoutParams attrs, int viewVisibility, int displayId,
            Rect outContentInsets, InputChannel outInputChannel) {
        int[] appOp = new int[1];
        int res = mPolicy.checkAddPermission(attrs, appOp);
        if (res != WindowManagerGlobal.ADD_OKAY) {
            return res;
        }


        boolean reportNewConfig = false;
        WindowState attachedWindow = null;
        WindowState win = null;
        long origId;
        final int type = attrs.type;


        synchronized(mWindowMap) {、

...

梳理一下setContentView是Activity方法，其实是调用Window的方法，然后调用

ViewRootImpl方法，它是先拿到WMS代理获取Session然后调用Session方法。

binder另一头是Session调用WMS方法。