? 本文將主要介紹addview方法，在windowManager、window、viewGroup中的實現原理。首先將介紹這些類結構關系，然后分析其內在聯系，介紹實現原理，最后介紹重要的一個參數windowManager.layoutParams。

文章預計分為三個部分。

?

? 一、首先介紹一下上述接口、類的結構

　　接口:windowManager

　　　　用來在應用與window之間的管理接口，管理窗口順序，消息等

public interface WindowManager extends android.view.ViewManager

???? 抽象類：window

　　　　定義窗口樣式和行為的抽象基類，用于作為頂層的view加到windowManager中。

　　　　唯一實現了這個抽象類的是PhoneWindow，實例化PhoneWindow需要一個窗口

　　　　public abstract class Window

　　　　其中有一個很重要的內部類

　　　　private class LocalWindowManager extends WindowManagerImpl.CompatModeWrapper{...}；

　　

　　抽象類:viewGroup

　　　　包含其他view的容器，layouts和view 容器的基類。

　　　　public abstract class ViewGroup extends View implements ViewParent, ViewManager

　　

　　相關接口：ViewParent

　　　　　　　　定義了一個view parent 的要負責的功能以及view和parent view之間的關聯

　　　　public interface ViewParent {

　　　　　　　　?public void requestLayout();

　　　　　　　　public void createContextMenu(ContextMenu menu);

　　　　　　　　public void bringChildToFront(View child);

　　　　　　　　.....

　　　　}

　　　　viewManager

　　　　　　用來添加和移除activity中的view的接口

public interface ViewManager
{
??? public void addView(View view, ViewGroup.LayoutParams params);
??? public void updateViewLayout(View view, ViewGroup.LayoutParams params);
??? public void removeView(View view);
}

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二.他們之間的內在關系。

　　1.　對于view來說，添加到viewGroup中是通過addView();方式來實現的，在addView中實際上使用的是：

　　　　　　　　　　　　addViewInner(child, index, params, false);

　　　　　　　　　　　流程是：　1.首先是對子View是否已經包含到一個父容器中

　　　　　　　　　　　　　　　　2.對子View布局參數的處理

　　　　　　　　　　　　　　　　3.調用addInArray來添加View

　　　　　　　　　　　　　　　　4.設置父View為當前的ViewGroup

　　　　　　　　　　　　　　　　5.焦點的處理

　　　　　　　　　　　　　　　　6.當前View的AttachInfo信息

　　　　　　　　　　　　　　　　7.View樹改變的監聽

　　　　　　　　　　　　　　　　8.子View中的mViewFlags的設置

???????????????????????????? 主要是通過??? addInArray添加view，添加的實現為system.arrayCopy(....);

　　

　　2. 對于viewGroup來說，都會顯示在在一個窗口中，每個都有一個父節點mParent，，最頂上的節點也是一個viewGroup，也就是decorView。

　　對于每個activity只有一個decorView也就是ViewRoot，只有一個window，window的獲取是通過下面方法獲取的。

1	Window mWindow = PolicyManager.makeNewWindow(this);

　　在activity中使用setContentView(),其實是使用了 window.setContentView()完成的，window.setcontentView,

　　還是通過LocalWindowManager.addView(view, params)來實現的。這里LocalWindowManager是實現了WindowManagerImpl.CompatModeWrapper

　　，本質上就是WindowManager、viewManager接口中的addvidew方法。

　　

　　3.? 對于windowManager來說一個系統只有一個，它是由系統底層實現的，用于負責調度當前顯示那個窗口，消息處理我們獲得一個windowManager的方式如下：

　　

1 2 3

WindowManager windowManager = (WindowManager)context().getSystemService( ????????????????????????????????????Context.WINDOW_SERVICE);

　　這里windowManager其實是一個接口，而通過getSystemService的方式。通過這個方式可以獲取很多的系統服務，比如電話、鬧鐘、電源管理等等。

　　同時windowManager和幾個類之間的內在聯系如下：

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本節結束，下節講述windowManager中WindowManager.layoutParams相關。

三.接上一節，分析windowManager中添加一個懸浮框的方式，首先看代碼

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WindowManager.LayoutParams params = new LayoutParams(); ????????params.width = width; ????????params.height = height; ????????params.format = PixelFormat.TRANSLUCENT; ????????params.type = WindowManager.LayoutParams.TYPE_APPLICATION_ATTACHED_DIALOG; ????????params.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL;//后面窗口仍然可以處理點設備事件 ????????params.setTitle("Toast"); ????????params.gravity = gravity; ????????params.windowAnimations = styleAnimations; WindowManager windowManager = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE); TextView float = new TextView(context); float.settext("this is a float window "); windowManager.addView(view, this.mLayoutParams);

　　　　params中一般參數都容易理解，這里有幾個特別要注意的地方：type、flags、windowAnimation

　　　1.對于type ：

　　　　

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type 的取值： ??????應用程序窗口。 ??????public static final int FIRST_APPLICATION_WINDOW = 1;??? ??????所有程序窗口的“基地”窗口，其他應用程序窗口都顯示在它上面。???? ??????public static final int TYPE_BASE_APPLICATION?? =1; ???????? ??????普通應用功能程序窗口。token必須設置為Activity的token，以指出該窗口屬誰。 ??????public static final int TYPE_APPLICATION?????? = 2; ???????用于應用程序啟動時所顯示的窗口。應用本身不要使用這種類型。 ??????它用于讓系統顯示些信息，直到應用程序可以開啟自己的窗口。?? ??????public static final int TYPE_APPLICATION_STARTING = 3; ?????? ??????應用程序窗口結束。 ??????public static final int LAST_APPLICATION_WINDOW = 99; ??????子窗口。子窗口的Z序和坐標空間都依賴于他們的宿主窗口。 ??????public static final int FIRST_SUB_WINDOW?????? = 1000; ??????面板窗口，顯示于宿主窗口上層。 ??????public static final int TYPE_APPLICATION_PANEL? = FIRST_SUB_WINDOW; ??????媒體窗口，例如視頻。顯示于宿主窗口下層。 ??????public static final int TYPE_APPLICATION_MEDIA? = FIRST_SUB_WINDOW+1; ??????應用程序窗口的子面板。顯示于所有面板窗口的上層。（GUI的一般規律，越“子”越靠上） ??????public static final int TYPE_APPLICATION_SUB_PANEL = FIRST_SUB_WINDOW +2; ??????對話框。類似于面板窗口，繪制類似于頂層窗口，而不是宿主的子窗口。 ??????public static final int TYPE_APPLICATION_ATTACHED_DIALOG = FIRST_SUB_WINDOW +3; ??????媒體信息。顯示在媒體層和程序窗口之間，需要實現透明（半透明）效果。（例如顯示字幕） ??????public static final int TYPE_APPLICATION_MEDIA_OVERLAY? = FIRST_SUB_WINDOW +4; ??????子窗口結束。（ End of types of sub-windows ） ??????public static final int LAST_SUB_WINDOW??????? = 1999; ??????系統窗口。非應用程序創建。 ??????public static final int FIRST_SYSTEM_WINDOW??? = 2000; ??????狀態欄。只能有一個狀態欄；它位于屏幕頂端，其他窗口都位于它下方。 ??????public static final int TYPE_STATUS_BAR??????? =? FIRST_SYSTEM_WINDOW; ??????搜索欄。只能有一個搜索欄；它位于屏幕上方。 ??????public static final int TYPE_SEARCH_BAR??????? = FIRST_SYSTEM_WINDOW+1; ??????電話窗口。它用于電話交互（特別是呼入）。它置于所有應用程序之上，狀態欄之下。 ??????public static final int TYPE_PHONE??????????? = FIRST_SYSTEM_WINDOW+2; ??????系統提示。它總是出現在應用程序窗口之上。 ??????public static final int TYPE_SYSTEM_ALERT????? =? FIRST_SYSTEM_WINDOW +3; ??????鎖屏窗口。 ??????public static final int TYPE_KEYGUARD????????? = FIRST_SYSTEM_WINDOW +4; ??????信息窗口。用于顯示toast。 ??????public static final int TYPE_TOAST??????????? = FIRST_SYSTEM_WINDOW +5; ??????系統頂層窗口。顯示在其他一切內容之上。此窗口不能獲得輸入焦點，否則影響鎖屏。 ??????public static final int TYPE_SYSTEM_OVERLAY??? =? FIRST_SYSTEM_WINDOW +6; ??????電話優先，當鎖屏時顯示。此窗口不能獲得輸入焦點，否則影響鎖屏。 ??????public static final int TYPE_PRIORITY_PHONE??? =? FIRST_SYSTEM_WINDOW +7; ??????系統對話框。（例如音量調節框）。 ??????public static final int TYPE_SYSTEM_DIALOG???? =? FIRST_SYSTEM_WINDOW +8; ??????鎖屏時顯示的對話框。 ??????public static final int TYPE_KEYGUARD_DIALOG?? =? FIRST_SYSTEM_WINDOW +9; ??????系統內部錯誤提示，顯示于所有內容之上。 ??????public static final int TYPE_SYSTEM_ERROR????? =? FIRST_SYSTEM_WINDOW +10; ??????內部輸入法窗口，顯示于普通UI之上。應用程序可重新布局以免被此窗口覆蓋。 ??????public static final int TYPE_INPUT_METHOD????? =? FIRST_SYSTEM_WINDOW +11; ??????內部輸入法對話框，顯示于當前輸入法窗口之上。 ??????public static final int TYPE_INPUT_METHOD_DIALOG= FIRST_SYSTEM_WINDOW +12; ??????墻紙窗口。 ??????public static final int TYPE_WALLPAPER???????? = FIRST_SYSTEM_WINDOW +13; ??????狀態欄的滑動面板。 ??????public static final int TYPE_STATUS_BAR_PANEL?? = FIRST_SYSTEM_WINDOW +14; ??????系統窗口結束。 <br>????? public static final int LAST_SYSTEM_WINDOW???? = 2999;

　　這里需要注意的地方是：

　　對于需要依附于activity的選擇2000以下的，獨立于activity，使用2002

　　

2.對于flag，這里詳細的說明

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int FLAGS_CHANGED?? 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. 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???? This constant was deprecated in API level 14. Blurring is no longer supported. int FLAG_DIM_BEHIND Window flag: everything behind this window will be dimmed. 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? This constant was deprecated in API level 17. This flag is no longer used. int FLAG_FORCE_NOT_FULLSCREEN?? Window flag: override FLAG_FULLSCREEN and force the screen decorations (such as the status bar) to be shown. int FLAG_FULLSCREEN Window flag: hide all screen decorations (such as the status bar) while this window is displayed. int FLAG_HARDWARE_ACCELERATED?? Indicates whether this window should be hardware accelerated. 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. int FLAG_LAYOUT_INSET_DECOR Window flag: a special option only for use in combination with FLAG_LAYOUT_IN_SCREEN. int FLAG_LAYOUT_IN_OVERSCAN Window flag: allow window contents to extend in to the screen's overscan area, if there is one. int FLAG_LAYOUT_IN_SCREEN?? Window flag: place the window within the entire screen, ignoring decorations around the border (such as the status bar). int FLAG_LAYOUT_NO_LIMITS?? Window flag: allow window to extend outside of the screen. 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. int FLAG_NOT_TOUCHABLE? Window flag: this window can never receive touch events. int FLAG_NOT_TOUCH_MODAL??? Window flag: even when this window is focusable (its FLAG_NOT_FOCUSABLE is not set), allow any pointer events outside of the window to be sent to the windows behind it. 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: treat the content of the window as secure, preventing it from appearing in screenshots or from being viewed on non-secure displays. int FLAG_SHOW_WALLPAPER Window flag: ask that the system wallpaper be shown behind your window. int FLAG_SHOW_WHEN_LOCKED?? Window flag: special flag to let windows be shown when the screen is locked. 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. 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. 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. 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.

　　3.對于windowAnimation

　　很多人說為什么我設置了windowAnimation，但是沒有動畫效果呢？

這里一定要注意，這里需要使用style，在style中添加如下：

?????

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??<style name="top"> ????<item name="@android:windowEnterAnimation">@anim/sanqiwan_toast_slide_top_enter</item> ???<item name="@android:windowExitAnimation">@anim/sanqiwan_toast_slide_top_exit</item> </style>

　　然后將style的resourceId賦給params.windowAnimation,如果是將動畫的resourceId賦值給params.windowAnimation，死也看得不到動畫效果滴。

?歡迎轉載，請標明出處。

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