Android window type图层分析
目录
- 1，Window 的分类
- 2, 自定义window图层
1，Window 的分类
按照使用场景的划分，window有三种类型：
1.1，Application Window:
应用程序串口，activity界面就属于这一级；
1.2，Sub Window:
子窗口，顾名思义，对应有主窗口。子窗口需要附在主窗口上，如 PopWindow；
1.3，System Window:
系统级的窗口，层级一般较高，如Toast弹框，输入法弹框等；
1.1 Application Window
用于应用级窗口，其type 取值范围 [1,99]，实际只定义使用了4个值：
TYPE_BASE_APPLICATION：
=1，base窗口，应用的最基本窗口
TYPE_APPLICATION：
=2，正常的稳定态应用窗口
TYPE_APPLICATION_STARTING：
=3，应用启动过程中的一个过程态窗口
TYPE_DRAWN_APPLICATION：
=4，确保窗口管理器在显示应用程序之前等待绘制该窗口
/**
* Window type: an application window that serves as the "base" window
* of the overall application; all other application windows will
* appear on top of it.
* In multiuser systems shows only on the owning user's window.
*/
public static final int TYPE_BASE_APPLICATION = 1;
/**
* Window type: a normal application window. The {@link #token} must be
* an Activity token identifying who the window belongs to.
* In multiuser systems shows only on the owning user's window.
*/
public static final int TYPE_APPLICATION = 2;
/**
* Window type: special application window that is displayed while the
* application is starting. Not for use by applications themselves;
* this is used by the system to display something until the
* application can show its own windows.
* In multiuser systems shows on all users' windows.
*/
public static final int TYPE_APPLICATION_STARTING = 3;
/**
* Window type: a variation on TYPE_APPLICATION that ensures the window
* manager will wait for this window to be drawn before the app is shown.
* In multiuser systems shows only on the owning user's window.
*/
public static final int TYPE_DRAWN_APPLICATION = 4;
1.2，Sub Window
顾名思义，对应有主窗口。子窗口需要依附在主窗口上，如果主窗口消失，子窗口也会消失，如 PopWindow；
type 取值范围 [1000,1999]，实际只使用了5个值:
/**
* 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;
/**
* End of types of sub-windows.
*/
public static final int LAST_SUB_WINDOW = 1999;
1.3，System Window
系统级的弹框，不依赖于某个界面，但很多图层需要系统权限；
type 取值范围 [2000,2999]，现在原生图层已定义50个左右，包括导航栏、状态栏、键盘、系统报警等图层。
/**
* Start of system-specific window types. These are not normally
* created by applications.
*/
public static final int FIRST_SYSTEM_WINDOW = 2000;
/**
* Window type: the status bar. There can be only one status bar
* window; it is placed at the top of the screen, and all other
* windows are shifted down so they are below it.
* In multiuser systems shows on all users' windows.
*/
public static final int TYPE_STATUS_BAR = FIRST_SYSTEM_WINDOW;
/**
* Window type: the search bar. There can be only one search bar
* window; it is placed at the top of the screen.
* In multiuser systems shows on all users' windows.
*/
public static final int TYPE_SEARCH_BAR = FIRST_SYSTEM_WINDOW+1;
/**
* Window type: phone. These are non-application windows providing
* user interaction with the phone (in particular incoming calls).
* These windows are normally placed above all applications, but behind
* the status bar.
* In multiuser systems shows on all users' windows.
* @deprecated for non-system apps. Use {@link #TYPE_APPLICATION_OVERLAY} instead.
*/
@Deprecated
public static final int TYPE_PHONE = FIRST_SYSTEM_WINDOW+2;
/**
* Window type: system window, such as low power alert. These windows
* are always on top of application windows.
* In multiuser systems shows only on the owning user's window.
* @deprecated for non-system apps. Use {@link #TYPE_APPLICATION_OVERLAY} instead.
*/
@Deprecated
public static final int TYPE_SYSTEM_ALERT = FIRST_SYSTEM_WINDOW+3;
... ...
/**
* Window type: wallpaper window, placed behind any window that wants
*/
public static final int TYPE_VENDOR_WALLPAPER = FIRST_SYSTEM_WINDOW+54;
/**
* Window type: status bar for U6X VirtualDisplay .same as TYPE_STATUS_BAR
*/
public static final int TYPE_VENDOR_STATUS_BAR = FIRST_SYSTEM_WINDOW + 55;
/**
* End of types of system windows.
*/
public static final int LAST_SYSTEM_WINDOW = 2999;
2 自定义window图层
Google提供的原生图层有限，无法满足所有的使用场景。特别是车载项目上，窗口的使用场景甚至比手机上还要多很多。所以需要根据项目需要，定制新图层，或者修改图层之间的关系；过程分两步：
2.1 声明新图层
WindowManager.java中定义，可以直接被app层使用，注意新定义的值不重复即可，一般自定义的图层需要TYPE_VENDOR_开头；不是定义的值越大，图层层级越高！
/**
* Window type: Banner info app
*/
public static final int TYPE_VENDOR_BANNER_CRITICAL = FIRST_SYSTEM_WINDOW+44;
/**
* Window type: VPA
*/
public static final int TYPE_VENDOR_VPA_OVERLAY = FIRST_SYSTEM_WINDOW+45;
/**
* Window type: Toast+
*/
public static final int TYPE_VENDOR_TOAST_PLUS = FIRST_SYSTEM_WINDOW+46;
/**
* Window type:Pano Card used for CDX707
*/
public static final int TYPE_VENDOR_CARD = FIRST_SYSTEM_WINDOW+47;
/**
* Window type:seconed navigationbar window type
*/
public static final int TYPE_VENDOR_NAVIGATION_BAR = FIRST_SYSTEM_WINDOW+48;
2.2 调整图层的层级关系
windowManagerPolicy中的getWindowLayerFromTypeLw()方法中声明了各层级的关系，返回的值越大，层级越高；开发者可以根据项目的需求，在这个方法里自行调整window的层级；
default int getWindowLayerFromTypeLw(int type, boolean canAddInternalSystemWindow) {
if (type >= FIRST_APPLICATION_WINDOW && type <= LAST_APPLICATION_WINDOW) {
return APPLICATION_LAYER;
}
switch (type) {
case TYPE_WALLPAPER:
case TYPE_VENDOR_WALLPAPER:
// wallpaper is at the bottom, though the window manager may move it.
return 1;
case TYPE_PRESENTATION:
case TYPE_PRIVATE_PRESENTATION:
return APPLICATION_LAYER;
case TYPE_DOCK_DIVIDER:
return APPLICATION_LAYER;
case TYPE_QS_DIALOG:
return APPLICATION_LAYER;
case TYPE_VENDOR_SURPRISE_MESSAGE:
return 3;
case TYPE_VENDOR_CARD:
return 4;
case TYPE_STATUS_BAR:
case TYPE_VENDOR_STATUS_BAR:
return 5;
case TYPE_STATUS_BAR_ADDITIONAL:
return 6;
... ...