android 13 WMS/AMS系统开发-WindowManagerService相关添加Window操作

frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java
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public int addWindow(Session session, IWindow client, LayoutParams attrs, int viewVisibility,
            int displayId, int requestUserId, InsetsVisibilities requestedVisibilities,
            InputChannel outInputChannel, InsetsState outInsetsState,
            InsetsSourceControl[] outActiveControls) {
       //ignore

            ActivityRecord activity = null;
            final boolean hasParent = parentWindow != null;
            // Use existing parent window token for child windows since they go in the same token
            // as there parent window so we can apply the same policy on them.
            WindowToken token = displayContent.getWindowToken(
                    hasParent ? parentWindow.mAttrs.token : attrs.token);
            // If this is a child window, we want to apply the same type checking rules as the
            // parent window type.
            final int rootType = hasParent ? parentWindow.mAttrs.type : type;

            boolean addToastWindowRequiresToken = false;

            final IBinder windowContextToken = attrs.mWindowContextToken;

            if (token == null) {//系统窗口我们在app层面没有设置对应的token故为null
                if (!unprivilegedAppCanCreateTokenWith(parentWindow, callingUid, type,
                        rootType, attrs.token, attrs.packageName)) {
                    return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
                }
                if (hasParent) {
                 //ignore
                } else if (mWindowContextListenerController.hasListener(windowContextToken)) {
                 //ignore
                } else {//最后进入这里
                    final IBinder binder = attrs.token != null ? attrs.token : client.asBinder();
                    token = new WindowToken.Builder(this, binder, type)//构造对应的WindowToken容器
                            .setDisplayContent(displayContent)
                            .setOwnerCanManageAppTokens(session.mCanAddInternalSystemWindow)
                            .setRoundedCornerOverlay(isRoundedCornerOverlay)
                            .build();
                }
            } 
             //ignore
             //基于token构造对应WindowState
            final WindowState win = new WindowState(this, session, client, token, parentWindow,
                    appOp[0], attrs, viewVisibility, session.mUid, userId,
                    session.mCanAddInternalSystemWindow);
          
            //校验一些策略
            final DisplayPolicy displayPolicy = displayContent.getDisplayPolicy();
            displayPolicy.adjustWindowParamsLw(win, win.mAttrs);
            attrs.flags = sanitizeFlagSlippery(attrs.flags, win.getName(), callingUid, callingPid);
            attrs.inputFeatures = sanitizeSpyWindow(attrs.inputFeatures, win.getName(), callingUid,
                    callingPid);
            win.setRequestedVisibilities(requestedVisibilities);
            //检验是否有权限加入
            res = displayPolicy.validateAddingWindowLw(attrs, callingPid, callingUid);
            if (res != ADD_OKAY) {
                return res;
            }
           //开枪与inputdispatcher通信的socketpair
            final boolean openInputChannels = (outInputChannel != null
                    && (attrs.inputFeatures & INPUT_FEATURE_NO_INPUT_CHANNEL) == 0);
            if  (openInputChannels) {
                win.openInputChannel(outInputChannel);
            }

            //ignore
            win.attach();
            mWindowMap.put(client.asBinder(), win);//装入容器，后面可以根据binder直接获取winstate
            win.initAppOpsState();
   			//ignore

            win.mToken.addWindow(win);
            displayPolicy.addWindowLw(win, attrs);
            displayPolicy.setDropInputModePolicy(win, win.mAttrs);
               //ignore
           
        }

        Binder.restoreCallingIdentity(origId);

        return res;
    }