我的Android进阶之旅------>WindowManager.LayoutParams介绍

本文转载于：

http://hubingforever.blog.163.com/blog/static/171040579201175111031938/

本文参照自：

http://developer.android.com/reference/android/view/WindowManager.LayoutParams.html

http://blog.sina.com.cn/s/blog_4b3c1f950100qd9s.html

public static class

WindowManager.LayoutParams

extends ViewGroup.LayoutParams

implements Parcelable

java.lang.Object
?	android.view.ViewGroup.LayoutParams
	?	android.view.WindowManager.LayoutParams

WindowManager.LayoutParams 是 WindowManager 接口的嵌套类；它继承于 ViewGroup.LayoutParams； 它用于向WindowManager描述Window的管理策略。

主要成员常量

Window flag系列

该系列主要用于对Window的flag进行设置。设置Window的flag,可以直接对Window的getAttributes()得到其 WindowManager.LayoutParams对象,然后直接对它flag变量操作。也可以Window的addFlags(int flags)方法，setFlags(int flags, int mask)方法，clearFlags(int flags)方法进行操作。

比如设置全屏：

 Window window = getWindow(); 

 WindowManager.LayoutParams winParams = win.getAttributes();

 winParams.flags=winParams.flags|WindowManager.LayoutParams.FLAG_FULLSCREEN；

 或

 window.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);

 或

 window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); 

 取消全屏

 Window window = getWindow(); 

 winParams.flags=winParams.flags&~WindowManager.LayoutParams.FLAG_FULLSCREEN;

 或

 window.clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);

 或

window.setFlags(0, WindowManager.LayoutParams.FLAG_FULLSCREEN);

所有Window flag如下：

int	FLAGS_CHANGED	用于表示flags发生了变化，关于此的详细内容请看后文。
int	FLAG_ALLOW_LOCK_WHILE_SCREEN_ON	Window flag: as long as this window is visible to the user, allow the lock screen to activate while the screen is on. 当该window对用户可见的时候，允许锁屏。
int	FLAG_ALT_FOCUSABLE_IM	Window flag: invert the state of FLAG_NOT_FOCUSABLE with respect to how this window interacts with the current method.
int	FLAG_BLUR_BEHIND	Window flag: blur everything behind this window. 让该window后所有东西都模糊（blur）
int	FLAG_DIM_BEHIND	Window flag: everything behind this window will be dimmed. 让该window后所有的东西都成暗淡（dim）
int	FLAG_DISMISS_KEYGUARD	Window flag: when set the window will cause the keyguard to be dismissed, only if it is not a secure lock keyguard.
int	FLAG_DITHER	Window flag: turn on dithering when compositing this window to the screen. 开启抖动（dithering）
int	FLAG_FORCE_NOT_FULLSCREEN	Window flag: Override {@link #FLAG_FULLSCREEN and force the screen decorations (such as status bar) to be shown. 恢复window非全屏显示
int	FLAG_FULLSCREEN	Window flag: Hide all screen decorations (e.g. 让window进行全屏显示
int	FLAG_HARDWARE_ACCELERATED	Indicates whether this window should be hardware accelerated. 对该window进行硬件加速. 该flag必须在设置你的Activity或Dialog的Content View之前进行设置， 而且如果你在mainfest文件中用android:hardwareAccelerated开启了该属性的话，那么你在程序中就不能再改变它。mainfest文件中android:hardwareAccelerated属性默认是开启的("true")。
int	FLAG_IGNORE_CHEEK_PRESSES	Window flag: intended for windows that will often be used when the user is holding the screen against their face, it will aggressively filter the event stream to prevent unintended presses in this situation that may not be desired for a particular window, when such an event stream is detected, the application will receive a CANCEL motion event to indicate this so applications can handle this accordingly by taking no action on the event until the finger is released.
int	FLAG_KEEP_SCREEN_ON	Window flag: as long as this window is visible to the user, keep the device's screen turned on and bright. 当该window对用户可见时，让设备屏幕处于高亮（bright）状态。
int	FLAG_LAYOUT_INSET_DECOR	Window flag: a special option only for use in combination with FLAG_LAYOUT_IN_SCREEN.
int	FLAG_LAYOUT_IN_SCREEN	Window flag: place the window within the entire screen, ignoring decorations around the border (a.k.a. 让window占满整个手机屏幕，不留任何边界（border）
int	FLAG_LAYOUT_NO_LIMITS	Window flag: allow window to extend outside of the screen. window大小不再不受手机屏幕大小限制，即window可能超出屏幕之外，这时部分内容在屏幕之外。
int	FLAG_NOT_FOCUSABLE	Window flag: this window won't ever get key input focus, so the user can not send key or other button events to it. 让window不能获得焦点，这样用户快就不能向该window发送按键事件及按钮事件
int	FLAG_NOT_TOUCHABLE	Window flag: this window can never receive touch events. 让该window不接受触摸屏事件
int	FLAG_NOT_TOUCH_MODAL	Window flag: Even when this window is focusable (its {@link #FLAG_NOT_FOCUSABLE is not set), allow any pointer events outside of the window to be sent to the windows behind it. 即使在该window在可获得焦点情况下，仍然把该window之外的任何event发送到该window之后的其他window.
int	FLAG_SCALED	Window flag: a special mode where the layout parameters are used to perform scaling of the surface when it is composited to the screen.
int	FLAG_SECURE	Window flag: don't allow screen shots while this window is displayed. 当该window在进行显示的时候，不允许截屏。
int	FLAG_SHOW_WALLPAPER	Window flag: ask that the system wallpaper be shown behind your window. 在该window后显示系统的墙纸（wallpaper）
int	FLAG_SHOW_WHEN_LOCKED	Window flag: special flag to let windows be shown when the screen is locked. 当锁屏的时候，显示该window.
int	FLAG_SPLIT_TOUCH	Window flag: when set the window will accept for touch events outside of its bounds to be sent to other windows that also support split touch. When this flag is not set, the first pointer that goes down determines the window to which all subsequent touches go until all pointers go up. When this flag is set, each pointer (not necessarily the first) that goes down determines the window to which all subsequent touches of that pointer will go until that pointer goes up thereby enabling touches with multiple pointers to be split across multiple windows 当该window在可以接受触摸屏情况下，让因在该window之外，而发送到后面的window的触摸屏可以支持split touch.
int	FLAG_TOUCHABLE_WHEN_WAKING	Window flag: When set, if the device is asleep when the touch screen is pressed, you will receive this first touch event. 当手机处于睡眠状态时，如果屏幕被按下，那么该window将第一个收到到事件
int	FLAG_TURN_SCREEN_ON	Window flag: when set as a window is being added or made visible, once the window has been shown then the system will poke the power manager's user activity (as if the user had woken up the device) to turn the screen on. 当然window被显示的时候，系统将把它当做一个用户活动事件，以点亮手机屏幕。
int	FLAG_WATCH_OUTSIDE_TOUCH	Window flag: if you have set FLAG_NOT_TOUCH_MODAL, you can set this flag to receive a single special MotionEvent with the action MotionEvent.ACTION_OUTSIDE  for touches that occur outside of your window. 如果你设置了该flag,那么在你FLAG_NOT_TOUNCH_MODAL的情况下，即使触摸屏事件发送在该window之外，其事件被发送到了后面的window,那么该window仍然将以MotionEvent.ACTION_OUTSIDE形式收到该触摸屏事件

softInputMode系列

该系列主要用于表示softInputMode，我们可以通过WindowManager.LayoutParams的softInputMode变量直接进行设置。softInputMode只能是一个显示软键盘时的window调整方式bite与一个控制软键盘显示状态的bite的组合。

显示软键盘时的window调整方式可以是SOFT_INPUT_ADJUST_NOTHING，SOFT_INPUT_ADJUST_PAN，

SOFT_INPUT_ADJUST_RESIZE，SOFT_INPUT_ADJUST_UNSPECIFIED之一。

用于描述软键盘显示的规则可以是SOFT_INPUT_STATE_ALWAYS_HIDDEN，SOFT_INPUT_STATE_ALWAYS_VISIBLE，

SOFT_INPUT_STATE_HIDDEN，SOFT_INPUT_STATE_VISIBLE，SOFT_INPUT_STATE_UNSPECIFIED之一

关于softInputMode的更多知识请参考《软件盘的开关》

所有的softInputMode系列常量如下：

int	SOFT_INPUT_ADJUST_NOTHING	Adjustment option for softInputMode: set to have a window not adjust for a shown input method. 当显示软键盘时，不调整window的布局
int	SOFT_INPUT_ADJUST_PAN	Adjustment option for softInputMode: set to have a window pan when an input method is shown, so it doesn't need to deal with resizing but just panned by the framework to ensure the current input focus is visible. 当显示软键盘时，调整window的空白区域来显示软键盘。即使调整空白区域，软键盘还是有可能遮挡一些有内容区域，这时用户就只有退出软键盘才能看到这些被遮挡区域并进行交互。
int	SOFT_INPUT_ADJUST_RESIZE	Adjustment option for softInputMode: set to allow the window to be resized when an input method is shown, so that its contents are not covered by the input method. 当显示软键盘时，调整window内的控件大小以便显示软键盘。这样的话控件可能会变形。
int	SOFT_INPUT_ADJUST_UNSPECIFIED	Adjustment option for softInputMode: nothing specified. 不指定显示软件盘时，window的调整方式。
int	SOFT_INPUT_IS_FORWARD_NAVIGATION	Bit for softInputMode: set when the user has navigated forward to the window. 表示用户导航（navigate）到了你的window
int	SOFT_INPUT_MASK_ADJUST	Mask for softInputMode of the bits that determine the way that the window should be adjusted to accommodate the soft input window. 显示软键盘时，用于表示window调整方式的bite的mask。 显示软键盘时的window调整方式可以是SOFT_INPUT_ADJUST_NOTHING，SOFT_INPUT_ADJUST_PAN，SOFT_INPUT_ADJUST_RESIZE，SOFT_INPUT_ADJUST_UNSPECIFIED。 用于描述软键盘显示的规则可以是SOFT_INPUT_STATE_ALWAYS_HIDDEN，SOFT_INPUT_STATE_ALWAYS_VISIBLE， SOFT_INPUT_STATE_HIDDEN，SOFT_INPUT_STATE_VISIBLE，SOFT_INPUT_STATE_UNSPECIFIED之一
int	SOFT_INPUT_MASK_STATE	Mask for softInputMode of the bits that determine the desired visibility state of the soft input area for this window. 用于描述软键盘显示规则的bite的mask.
int	SOFT_INPUT_MODE_CHANGED	用于表示softInputMode发生了变化。关于此的详细内容请看后文。
int	SOFT_INPUT_STATE_ALWAYS_HIDDEN	Visibility state for softInputMode: please always hide any soft input area when this window receives focus. 总是隐藏软键盘。
int	SOFT_INPUT_STATE_ALWAYS_VISIBLE	Visibility state for softInputMode:  please always make the soft input area visible when this window receives input focus. 总是显示软键盘
int	SOFT_INPUT_STATE_HIDDEN	Visibility state for softInputMode: please hide any soft input area when normally appropriate (when the user is navigating forward to your window). 用户导航（navigate）到你的窗口的时候,隐藏软键盘
int	SOFT_INPUT_STATE_UNCHANGED	Visibility state for softInputMode: please don't change the state of the soft input area.
int	SOFT_INPUT_STATE_UNSPECIFIED	Visibility state for softInputMode: no state has been specified. 没有软键盘显示的约定规则
int	SOFT_INPUT_STATE_VISIBLE	Visibility state for softInputMode: please show the soft input area when normally appropriate (when the user is navigating forward to your window). 用户导航（navigate）到你的窗口的时候，显示软键盘

Window type系列

该系列主要用于表示window的类型。我们可以通过WindowManager.LayoutParams的type变量直接进行设置.

int	TYPE_APPLICATION	Window type: a normal application window. 普通的应用程序window，token必须设置为Activity的token，以指出该窗口属谁
int	TYPE_APPLICATION_ATTACHED_DIALOG	Window type: like TYPE_APPLICATION_PANEL, but layout of the window happens as that of a top-level window, not as a child of its container. 对话框。类似于面板窗口，绘制类似于顶层窗口，而不是宿主的子窗口。
int	TYPE_APPLICATION_MEDIA	Window type: window for showing media (e.g. 媒体窗口，例如视频。显示于宿主窗口下层。
int	TYPE_APPLICATION_PANEL	Window type: a panel on top of an application window. 面板窗口，显示于宿主窗口上层
int	TYPE_APPLICATION_STARTING	Window type: special application window that is displayed while the application is starting. 用于应用程序启动时所显示的窗口。应用本身不要使用这种类型。它用于让系统显示些信息，直到应用程序可以开启自己的窗口
int	TYPE_APPLICATION_SUB_PANEL	Window type: a sub-panel on top of an application window. 应用程序窗口的子面板。显示于所有面板窗口的上层。（GUI的一般规律，越“子”越靠上）
int	TYPE_BASE_APPLICATION	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. 所有程序窗口的“基地”窗口，其他应用程序窗口都显示在它上面。
int	TYPE_CHANGED	表示window的类型发生了变化，关于此的详细内容请看后文。
int	TYPE_INPUT_METHOD	Window type: internal input methods windows, which appear above the normal UI. 内部输入法窗口，显示于普通UI之上。应用程序可重新布局以免被此窗口覆盖
int	TYPE_INPUT_METHOD_DIALOG	Window type: internal input methods dialog windows, which appear above the current input method window. 内部输入法对话框，显示于当前输入法窗口之上
int	TYPE_KEYGUARD	Window type: keyguard window. 锁屏窗口
int	TYPE_KEYGUARD_DIALOG	Window type: dialogs that the keyguard shows 锁屏时显示的对话框
int	TYPE_PHONE	Window type: phone. 电话窗口。它用于电话交互（特别是呼入）。它置于所有应用程序之上，状态栏之下。
int	TYPE_PRIORITY_PHONE	Window type: priority phone UI, which needs to be displayed even if the keyguard is active. 电话优先，当锁屏时显示。此窗口不能获得输入焦点，否则影响锁屏。
int	TYPE_SEARCH_BAR	Window type: the search bar. 搜索栏。只能有一个搜索栏；它位于屏幕上方。
int	TYPE_STATUS_BAR	Window type: the status bar. 状态栏类型的window。只能有一个状态栏window；它位于屏幕顶端，其他窗口都位于它下方。
int	TYPE_STATUS_BAR_PANEL	Window type: panel that slides out from over the status bar 状态栏的滑动面板
int	TYPE_SYSTEM_ALERT	Window type: system window, such as low power alert. 系统提示window,比如电池低的警告。它总是出现在应用程序窗口之上。
int	TYPE_SYSTEM_DIALOG	Window type: panel that slides out from the status bar 系统对话框。（例如音量调节框）
int	TYPE_SYSTEM_ERROR	Window type: internal system error windows, appear on top of everything they can. 系统内部错误提示，显示于所有内容之上
int	TYPE_SYSTEM_OVERLAY	Window type: system overlay windows, which need to be displayed on top of everything else. 系统顶层窗口。显示在其他一切内容之上。此窗口不能获得输入焦点，否则影响锁屏。
int	TYPE_TOAST	Window type: transient notifications. toast类型的window
int	TYPE_WALLPAPER	Window type: wallpaper window, placed behind any window that wants to sit on top of the wallpaper. 用于墙纸的window

window 的类型被分为了3大类:

Application windows
(ranging from FIRST_APPLICATION_WINDOW to
LAST_APPLICATION_WINDOW) are normal top-level application windows. For these types of windows, the token must be set to the token of the activity they are
a part of (this will normally be done for you if token is null).

Sub-windows
(ranging from FIRST_SUB_WINDOW to
LAST_SUB_WINDOW) are associated with another top-level window. For these types of windows, the token must be the token of the window it is attached to.

System windows
(ranging from FIRST_SYSTEM_WINDOW to
LAST_SYSTEM_WINDOW) are special types of windows for use by the system for specific purposes. They should not normally be used by applications, and a special
permission is required to use them.

系统专门定义了FIRST_APPLICATION_WINDOW , LAST_APPLICATION_WINDOW,FIRST_SUB_WINDOW, LAST_SUB_WINDOW,

FIRST_SYSTEM_WINDOW,LAST_SYSTEM_WINDOW 以表示window的3大类型的类型的取值的范围。

int	FIRST_APPLICATION_WINDOW	Start of window types that represent normal application windows. Constant Value: 1 (0x00000001)
int	FIRST_SUB_WINDOW	Start of types of sub-windows. Constant Value: 1000 (0x000003e8)
int	FIRST_SYSTEM_WINDOW	Start of system-specific window types. Constant Value: 2000 (0x000007d0)

int	LAST_APPLICATION_WINDOW	End of types of application windows. Constant Value: 99 (0x00000063)
int	LAST_SUB_WINDOW	End of types of sub-windows. Constant Value: 1999 (0x000007cf)
int	LAST_SYSTEM_WINDOW	End of types of system windows. Constant Value: 2999 (0x00000bb7)

BRIGHTNESS系列

该系列主要用于设置window的brightness(screenBrightness/buttonBrightness)。我们可以通过WindowManager.LayoutParams的screenBrightness/buttonBrightness变量直接进行设置。

其中screenBrightness表示屏幕的brightness,而buttonBrightness表示一般按键和键盘按键的brightness

float	BRIGHTNESS_OVERRIDE_FULL	Value for screenBrightness and buttonBrightness  indicating that the screen or button backlight brightness should be set to the hightest value when this window is in front. 把brightness(screenBrightness/buttonBrightness)设置到最高值。
float	BRIGHTNESS_OVERRIDE_NONE	Default value for screenBrightness and buttonBrightness indicating that the brightness value is not overridden for this window and normal brightness policy should be used. 不对brightness(screenBrightness/buttonBrightness)重新进行设置，采用默认的普通值。
float	BRIGHTNESS_OVERRIDE_OFF	Value for screenBrightness and buttonBrightness indicating that the screen or button backlight brightness should be set to the lowest value when this window is in front. 把brightness(screenBrightness/buttonBrightness)设置到最低值。

changed系列

该系列主要用于 int copyFrom (WindowManager.LayoutParams o)函数中。

在函数中，首先将用参数中传入的WindowManager.LayoutParams的信息复制到本WindowManager.LayoutParams中，然后返回一个整数，以bite形式表示调用该函数后WindowManager.LayoutParams的哪些信息发送了变化

int	ALPHA_CHANGED	用于表示成员变量alpha是否被改变
int	ANIMATION_CHANGED	用于表示成员变量windowAnimations是否被改变
int	DIM_AMOUNT_CHANGED	用于表示成员变量dimAmount是否被改变
int	FLAGS_CHANGED	用于表示成员变量flags是否被改变
int	LAYOUT_CHANGED	用于表示layout是否被改变.这里的layout是指以下变量所包含的信息： width，height,x,y, verticalMargin，verticalWeight,horizontalMargin，horizontalWeight
int	SCREEN_BRIGHTNESS_CHANGED	用于表示brightness是否被改变. 这里的brightness是指以下变量对应的信息：screenBrightness，buttonBrightness
int	SCREEN_ORIENTATION_CHANGED	用于表示成员变量screenOrientation是否被改变
int	SOFT_INPUT_MODE_CHANGED	用于表示成员变量softInputMode是否被改变
int	TITLE_CHANGED	用于表示成员变量title是否被改变
int	TYPE_CHANGED	用于表示成员变量type是否被改变
int	FORMAT_CHANGED	Constant Value: (0x00000008) 用于表示成员变量format是否被改变

成员变量

继承于ViewGroup.LayoutParams的成员变量

public int	height	Information about how tall the view wants to be.
public LayoutAnimationController.AnimationParameters	layoutAnimationParameters	Used to animate layouts.
public int	width	Information about how wide the view wants to be.

自身的成员变量

public static final Creator<WindowManager.LayoutParams>	CREATOR
public float	alpha	An alpha value to apply to this entire window.
public float	buttonBrightness	This can be used to override the standard behavior of the button and keyboard backlights.
public float	dimAmount	When FLAG_DIM_BEHIND is set, this is the amount of dimming to apply.
public int	flags	Various behavioral options/flags.
public int	format	The desired bitmap format.
public int	gravity	Placement of window within the screen as per Gravity.
public float	horizontalMargin	The horizontal margin, as a percentage of the container's width, between the container and the widget.
public float	horizontalWeight	Indicates how much of the extra space will be allocated horizontally to the view associated with these LayoutParams.
public int	memoryType	This field is deprecated. this is ignored
public String	packageName	Name of the package owning this window.
public float	screenBrightness	This can be used to override the user's preferred brightness of the screen.
public int	screenOrientation	Specific orientation value for a window.
public int	softInputMode	Desired operating mode for any soft input area.
public int	systemUiVisibility	Control the visibility of the status bar.
public IBinder	token	Identifier for this window.
public int	type	The general type of window.
public float	verticalMargin	The vertical margin, as a percentage of the container's height, between the container and the widget.
public float	verticalWeight	Indicates how much of the extra space will be allocated vertically to the view associated with these LayoutParams.
public int	windowAnimations	A style resource defining the animations to use for this window.
public int	x	X position for this window.
public int	y	Y position for this window.

成员函数

ublic Methods
final int	copyFrom(WindowManager.LayoutParams o)
String	debug(String output) Returns a String representation of this set of layout parameters.
int	describeContents() Describe the kinds of special objects contained in this Parcelable's marshalled representation.
final CharSequence	getTitle()
static boolean	mayUseInputMethod(int flags) Given a particular set of window manager flags, determine whether such a window may be a target for an input method when it has focus.
final void	setTitle(CharSequence title)
String	toString() Returns a string containing a concise, human-readable description of this object.
void	writeToParcel(Parcel out, int parcelableFlags) Flatten this object in to a Parcel.