Android WindowManager窗口类型，2021国内知名大厂Android岗面经

• ZMS:OptionMenu、ContextMenu的默认类型

*/

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

• ZMS:TYPE_APPLICATION_MEDIA的重影窗口，显示在TYPE_APPLICATION_MEDIA和应用窗口之间

*/

public static final int TYPE_APPLICATION_MEDIA_OVERLAY = FIRST_SUB_WINDOW+4;

/**

• End of types of sub-windows.

• ZMS:最后一个子窗口-创建子窗口时，客户端可以指定窗口类型介于1000-1999之间，

• 而WindowManagerService在进行窗口叠加时，会动态调整层值。

*/

public static final int LAST_SUB_WINDOW = 1999;

/**

• Start of system-specific window types. These are not normally

• created by applications.

• ZMS:首个系统窗口-系统窗口，系统窗口不需要对应任何Activity，也不需要有父窗口，

• 对于应用程序而言，理论上是无法创建系统窗口的，因为所有的应用程序都没有这个权限，

• 然而系统进程却可以创建系统窗口。

*/

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.

• ZMS:状态栏窗口，层值2000。

*/

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.

• ZMS:搜索条窗口，层值2001。

*/

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.

• ZMS:来电显示窗口

*/

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