WMS学习上一、了解WMS 页面流程页面绘制逻辑页面的显示逻辑绘制Canvas的来源二、 Android 中的W

一、了解WMS

页面流程

Activity-->Window-->DecorView->
                                ViewStub(导航栏等系统控件)
                                ContentParent-ContentView-setContentView(页面布局文件)

页面绘制逻辑

页面的显示逻辑

绘制Canvas的来源

ViewrootImpl:
IWindowSession.relayout->mSurfaceControll->
surface.copyfrom(mSurfaceControl)->mSurface.lockCanvas->
canvace-decorview-view.draw


Session:用AIDL实现的一个Bindler通信代码

二、 Android 中的Window

1、Window、WindowManager、WMS简单介绍

WMS<->WindowManager-Window WindowManager：Window管理类 Window：窗口，Activity、Dialog、Toast、popwindow、输入法、系统弹窗 WMS：真正的窗口管理类大小、层级、添加、删除、启动

2、Window基本概念

窗口的分类： Application Window ：应用程序窗口Activity Sub Window :子窗口，不能独立存在，需要附着在其他窗口上才可以 popwindow System Window:输入法、系统音量调、错误窗口等

类型：

Application Window：1~99都是属于应用层的窗口
//这个1用来做App Window下线判断的，应用窗口标志不能比当前更低
public static final int FIRST_APPLICATION_WINDOW = 1;
//
public static final int TYPE_BASE_APPLICATION   = 1;
public static final int TYPE_APPLICATION        = 2;
//App点击图标到展示应用启动页之间的页面（闪屏页）
public static final int TYPE_APPLICATION_STARTING = 3;
public static final int TYPE_DRAWN_APPLICATION = 4;

//app window上线判断，表示1~99之前都是App window
public static final int LAST_APPLICATION_WINDOW = 99;

sub window:1000~1999

/**

Start of types of sub-windows. The {@link #token} of these windows
must be set to the window they are attached to. These types of
windows are kept next to their attached window in Z-order, and their
coordinate space is relative to their attached window. */ public static final int FIRST_SUB_WINDOW = 1000;

/**

Window type: a panel on top of an application window. These windows
appear on top of their attached window. */ public static final int TYPE_APPLICATION_PANEL = FIRST_SUB_WINDOW;

/**

Window type: window for showing media (such as video). These windows
are displayed behind their attached window. */ public static final int TYPE_APPLICATION_MEDIA = FIRST_SUB_WINDOW + 1;

/**

Window type: a sub-panel on top of an application window. These
windows are displayed on top their attached window and any
{@link #TYPE_APPLICATION_PANEL} panels. */ public static final int TYPE_APPLICATION_SUB_PANEL = FIRST_SUB_WINDOW + 2;

/** Window type: like {@link #TYPE_APPLICATION_PANEL}, but layout

of the window happens as that of a top-level window, not
as a child of its container. */ public static final int TYPE_APPLICATION_ATTACHED_DIALOG = FIRST_SUB_WINDOW + 3;

/**

Window type: window for showing overlays on top of media windows.
These windows are displayed between TYPE_APPLICATION_MEDIA and the
application window. They should be translucent to be useful. This
is a big ugly hack so:
@hide */ @UnsupportedAppUsage public static final int TYPE_APPLICATION_MEDIA_OVERLAY = FIRST_SUB_WINDOW + 4;

/**

Window type: a above sub-panel on top of an application window and it's
sub-panel windows. These windows are displayed on top of their attached window
and any {@link #TYPE_APPLICATION_SUB_PANEL} panels.
@hide */ public static final int TYPE_APPLICATION_ABOVE_SUB_PANEL = FIRST_SUB_WINDOW + 5;

/**