Android WindowManger的层级分析详解
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2022-03-20 13:59:33
目录一. window 分类二. window层级（三）如何真正查看 window 的优先级（四） 层级高低具体分析（对比toast以及软键盘）一. window 分类 应用 window（ap...
一. window 分类
- 应用 window（applicationwindow： 对应一个 acitivity）
- 子 window （subwindow：不能单独存在，需要依附在特定的父 window 中，比如常见的一些 dialog 就是一个子 window）
- 系统 window （systemwindow：需要声明权限才能创建的 window，比如 toast 和系统状态栏都是系统 window）
二. window层级
window 是分层的，每个 window 都有对应的 z-ordered，层级大的会覆盖在层级小的 window 上面，这和 html 中的 z-index 概念是完全一致的。
在三种 window 中，每一种window的层级范围也是不同的，如下：
应用window 1~99
子window 1000~1999
系统window 2000~2999
这些层级范围对应着 windowmanager.layoutparams 的 type 参数，如果想要 window 位于所有 window 的最顶层，那么采用较大的层级即可，很显然系统 window 的层级是最大的，当我们采用系统层级时，需要声明权限。
（1）应用程序窗口：
package android.view;
public interface windowmanager
/**
* start of window types that represent normal application windows.
*/
public static final int first_application_window = 1;
/**
* 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;
/**
* end of types of application windows.
*/
public static final int last_application_window = 99;
（2）子窗口：
package android.view;
public interface windowmanager
/**
* 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, <em>not</em>
* 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;
（3）系统窗口：
package android.view;
public interface windowmanager
/**
* 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: keyguard window.
* in multiuser systems shows on all users' windows.
* @removed
*/
public static final int type_keyguard = first_system_window+4;
/**
* window type: transient notifications.
* 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_toast = first_system_window+5;
/**
* window type: system overlay windows, which need to be displayed
* on top of everything else. these windows must not take input
* focus, or they will interfere with the keyguard.
* 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_overlay = first_system_window+6;
/**
* window type: priority phone ui, which needs to be displayed even if
* the keyguard is active. these windows must not take input
* focus, or they will interfere with the keyguard.
* 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_priority_phone = first_system_window+7;
/**
* window type: panel that slides out from the status bar
* in multiuser systems shows on all users' windows.
*/
public static final int type_system_dialog = first_system_window+8;
/**
* window type: dialogs that the keyguard shows
* in multiuser systems shows on all users' windows.
*/
public static final int type_keyguard_dialog = first_system_window+9;
/**
* window type: internal system error windows, appear on top of
* everything they can.
* 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_error = first_system_window+10;
/**
* window type: internal input methods windows, which appear above
* the normal ui. application windows may be resized or panned to keep
* the input focus visible while this window is displayed.
* in multiuser systems shows only on the owning user's window.
*/
public static final int type_input_method = first_system_window+11;
/**
* window type: internal input methods dialog windows, which appear above
* the current input method window.
* in multiuser systems shows only on the owning user's window.
*/
public static final int type_input_method_dialog= first_system_window+12;
/**
* window type: wallpaper window, placed behind any window that wants
* to sit on top of the wallpaper.
* in multiuser systems shows only on the owning user's window.
*/
public static final int type_wallpaper = first_system_window+13;
/**
* window type: panel that slides out from over the status bar
* in multiuser systems shows on all users' windows.
*/
public static final int type_status_bar_panel = first_system_window+14;
/**
* window type: secure system overlay windows, which need to be displayed
* on top of everything else. these windows must not take input
* focus, or they will interfere with the keyguard.
*
* this is exactly like {@link #type_system_overlay} except that only the
* system itself is allowed to create these overlays. applications cannot
* obtain permission to create secure system overlays.
*
* in multiuser systems shows only on the owning user's window.
* @hide
*/
@unsupportedappusage
public static final int type_secure_system_overlay = first_system_window+15;
/**
* window type: the drag-and-drop pseudowindow. there is only one
* drag layer (at most), and it is placed on top of all other windows.
* in multiuser systems shows only on the owning user's window.
* @hide
*/
public static final int type_drag = first_system_window+16;
/**
* window type: panel that slides out from over the status bar
* in multiuser systems shows on all users' windows. these windows
* are displayed on top of the stauts bar and any {@link #type_status_bar_panel}
* windows.
* @hide
*/
public static final int type_status_bar_sub_panel = first_system_window+17;
/**
* window type: (mouse) pointer
* in multiuser systems shows on all users' windows.
* @hide
*/
public static final int type_pointer = first_system_window+18;
/**
* window type: navigation bar (when distinct from status bar)
* in multiuser systems shows on all users' windows.
* @hide
*/
public static final int type_navigation_bar = first_system_window+19;
/**
* window type: the volume level overlay/dialog shown when the user
* changes the system volume.
* in multiuser systems shows on all users' windows.
* @hide
*/
public static final int type_volume_overlay = first_system_window+20;
/**
* window type: the boot progress dialog, goes on top of everything
* in the world.
* in multiuser systems shows on all users' windows.
* @hide
*/
public static final int type_boot_progress = first_system_window+21;
/**
* window type to consume input events when the systemui bars are hidden.
* in multiuser systems shows on all users' windows.
* @hide
*/
public static final int type_input_consumer = first_system_window+22;
/**
* window type: dreams (screen saver) window, just above keyguard.
* in multiuser systems shows only on the owning user's window.
* @hide
*/
public static final int type_dream = first_system_window+23;
/**
* window type: navigation bar panel (when navigation bar is distinct from status bar)
* in multiuser systems shows on all users' windows.
* @hide
*/
public static final int type_navigation_bar_panel = first_system_window+24;
/**
* window type: display overlay window. used to simulate secondary display devices.
* in multiuser systems shows on all users' windows.
* @hide
*/
@unsupportedappusage
public static final int type_display_overlay = first_system_window+26;
/**
* window type: magnification overlay window. used to highlight the magnified
* portion of a display when accessibility magnification is enabled.
* in multiuser systems shows on all users' windows.
* @hide
*/
public static final int type_magnification_overlay = first_system_window+27;
/**
* window type: window for presentation on top of private
* virtual display.
*/
public static final int type_private_presentation = first_system_window+30;
/**
* window type: windows in the voice interaction layer.
* @hide
*/
public static final int type_voice_interaction = first_system_window+31;
/**
* window type: windows that are overlaid <em>only</em> by a connected {@link
* android.accessibilityservice.accessibilityservice} for interception of
* user interactions without changing the windows an accessibility service
* can introspect. in particular, an accessibility service can introspect
* only windows that a sighted user can interact with which is they can touch
* these windows or can type into these windows. for example, if there
* is a full screen accessibility overlay that is touchable, the windows
* below it will be introspectable by an accessibility service even though
* they are covered by a touchable window.
*/
public static final int type_accessibility_overlay = first_system_window+32;
/**
* window type: starting window for voice interaction layer.
* @hide
*/
public static final int type_voice_interaction_starting = first_system_window+33;
/**
* window for displaying a handle used for resizing docked stacks. this window is owned
* by the system process.
* @hide
*/
public static final int type_dock_divider = first_system_window+34;
/**
* window type: like {@link #type_application_attached_dialog}, but used
* by quick settings tiles.
* @hide
*/
public static final int type_qs_dialog = first_system_window+35;
/**
* window type: shares similar characteristics with {@link #type_dream}. the layer is
* reserved for screenshot region selection. these windows must not take input focus.
* @hide
*/
public static final int type_screenshot = first_system_window + 36;
/**
* window type: window for presentation on an external display.
* @see android.app.presentation
* @hide
*/
public static final int type_presentation = first_system_window + 37;
/**
* window type: application overlay windows are displayed above all activity windows
* (types between {@link #first_application_window} and {@link #last_application_window})
* but below critical system windows like the status bar or ime.
* <p>
* the system may change the position, size, or visibility of these windows at anytime
* to reduce visual clutter to the user and also manage resources.
* <p>
* requires {@link android.manifest.permission#system_alert_window} permission.
* <p>
* the system will adjust the importance of processes with this window type to reduce the
* chance of the low-memory-killer killing them.
* <p>
* in multi-user systems shows only on the owning user's screen.
*/
public static final int type_application_overlay = first_system_window + 38;
/**
* end of types of system windows.
*/
public static final int last_system_window = 2999;
窗口显示顺序：
type 值越大层级越高，type 值大的覆盖 type 值小的，这只是一般规律。
（三）如何真正查看 window 的优先级
/frameworks/base/services/core/java/com/android/server/policy/windowmanagerpolicy.java
default int getwindowlayerfromtypelw(int type, boolean canaddinternalsystemwindow) {
if (type >= first_application_window && type <= last_application_window) {
return application_layer;
}
switch (type) {
case type_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_phone:
return 3;
case type_search_bar:
case type_voice_interaction_starting:
return 4;
case type_voice_interaction:
// voice interaction layer is almost immediately above apps.
return 5;
case type_input_consumer:
return 6;
case type_system_dialog:
return 7;
case type_toast:
// toasts and the plugged-in battery thing
return 8;
case type_priority_phone:
// sim errors and unlock. not sure if this really should be in a high layer.
return 9;
case type_system_alert:
// like the anr / app crashed dialogs
return canaddinternalsystemwindow ? 11 : 10;
case type_application_overlay:
return 12;
case type_dream:
// used for dreams (screensavers with type_dream windows)
return 13;
case type_input_method:
// on-screen keyboards and other such input method user interfaces go here.
return 14;
case type_input_method_dialog:
// on-screen keyboards and other such input method user interfaces go here.
return 15;
case type_status_bar:
return 17;
case type_status_bar_panel:
return 18;
case type_status_bar_sub_panel:
return 19;
case type_keyguard_dialog:
return 20;
case type_volume_overlay:
// the on-screen volume indicator and controller shown when the user
// changes the device volume
return 21;
case type_system_overlay:
// the on-screen volume indicator and controller shown when the user
// changes the device volume
return canaddinternalsystemwindow ? 22 : 11;
case type_navigation_bar:
// the navigation bar, if available, shows atop most things
return 23;
case type_navigation_bar_panel:
// some panels (e.g. search) need to show on top of the navigation bar
return 24;
case type_screenshot:
// screenshot selection layer shouldn't go above system error, but it should cover
// navigation bars at the very least.
return 25;
case type_system_error:
// system-level error dialogs
return canaddinternalsystemwindow ? 26 : 10;
case type_magnification_overlay:
// used to highlight the magnified portion of a display
return 27;
case type_display_overlay:
// used to simulate secondary display devices
return 28;
case type_drag:
// the drag layer: input for drag-and-drop is associated with this window,
// which sits above all other focusable windows
return 29;
case type_accessibility_overlay:
// overlay put by accessibility services to intercept user interaction
return 30;
case type_secure_system_overlay:
return 31;
case type_boot_progress:
return 32;
case type_pointer:
// the (mouse) pointer layer
return 33;
default:
slog.e("windowmanager", "unknown window type: " + type);
return application_layer;
}
}
以上返回的是除 application 外的 window 的层级，在开发系统应用时可以选择一种开发自己的 window.
（四） 层级高低具体分析（对比toast以及软键盘）
低于toast--->盖不住toast
低于软键盘--->盖不住软键盘
依附activity使用--->is your activity running?
public static int getwindowtype(int num) {
switch (num) {
case 1:
return windowmanager.layoutparams.type_phone;//低于toast 低于软键盘
case 2:
return windowmanager.layoutparams.type_search_bar;//低于toast 低于软键盘
case 3:
return windowmanager.layoutparams.type_system_dialog;//低于toast 低于软键盘
case 4:
return windowmanager.layoutparams.type_priority_phone;//高于toast 低于软键盘
case 5:
return windowmanager.layoutparams.type_application_overlay;//高于toast 低于软键盘
case 6:
return windowmanager.layoutparams.type_input_method_dialog;//高于toast 盖住键盘
case 7:
return windowmanager.layoutparams.type_system_error;//高于toast 低于软键盘
case 8:
return windowmanager.layoutparams.type_keyguard_dialog;//高于toast 低于软键盘
case 9:
return windowmanager.layoutparams.type_system_alert;//高于toast 高于软键盘
case 10:
return windowmanager.layoutparams.type_status_bar;//高于toast 高于软键盘（键盘会把透明view顶起）
case 11:
return windowmanager.layoutparams.type_status_bar_panel;//高于toast 高于软键盘（键盘会把透明view顶起）
case 12:
return windowmanager.layoutparams.type_system_overlay;//低于下级页面
case 13:
return windowmanager.layoutparams.type_accessibility_overlay;//is your activity running?
case 14:
return windowmanager.layoutparams.type_base_application;// is your activity running?
case 15:
return windowmanager.layoutparams.type_application;// is your activity running?
case 16:
return windowmanager.layoutparams.type_application_starting;// is your activity running?
case 17:
return windowmanager.layoutparams.type_drawn_application;// is your activity running?
case 18:
return windowmanager.layoutparams.type_application_panel;// is your activity running?
case 19:
return windowmanager.layoutparams.type_application_media;// is your activity running?
case 20:
return windowmanager.layoutparams.type_application_sub_panel;// is your activity running?
case 21:
return windowmanager.layoutparams.type_application_attached_dialog;// is your activity running?
case 22:
return windowmanager.layoutparams.type_wallpaper;// is your activity running?
case 23:
return windowmanager.layoutparams.type_toast;// is your activity running?
case 24:
return windowmanager.layoutparams.type_input_method;//is your activity running?
case 25:
return windowmanager.layoutparams.type_private_presentation;//permission denied for window type 2030
default:
return 0;
}
}
（五）如何定制系统层级
改变层级关系需要改写 getwindowlayerfromtypelw 的 switch 顺序结构和返回值
如果需要更改一些 window 的行为，需要修改
/frameworks/base/services/core/java/com/android/server/policy/phonewindowmanager.java
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