Android Studio - SurfaceView 參數（SurfaceView Parameters）（六十九）

Android Studio - SurfaceView 參數（SurfaceView Parameters）（六十九）：

當 SurfaceView 的窗口可見時，將為您創建 Surface；應該實現 SurfaceHolder.Callback#surfaceCreated 和 SurfaceHolder.Callback#surfaceDestroyed 以發現在顯示和隱藏窗口時創建和銷毀 Surface 的時間。此類的目的之一是提供一個表面，輔助線程可以在其中渲染到屏幕中。 如果要以這種方式使用它，則需要了解一些線程語義。

Android SurfaceView 和 SurefaceHolder 關係

SurfaceView Class Parameters Public constructors 屬性：

Public constructors

SurfaceView(Context context)

SurfaceView(Context context, AttributeSet attrs)

SurfaceView(Context context, AttributeSet attrs, int defStyleAttr)

SurfaceView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)

SurfaceView Public methods Class Parameters 類參數屬性：

Public methods
void	draw(Canvas canvas) Manually render this view (and all of its children) to the given Canvas.
boolean	gatherTransparentRegion(Region region) This is used by the ViewRoot to perform an optimization when the view hierarchy contains one or several SurfaceView.
SurfaceHolder	getHolder() Return the SurfaceHolder providing access and control over this SurfaceView's underlying surface.
IBinder	getHostToken() A token used for constructing SurfaceControlViewHost.
int	getImportantForAccessibility() Gets the mode for determining whether this View is important for accessibility.
SurfaceControl	getSurfaceControl() Return a SurfaceControl which can be used for parenting Surfaces to this SurfaceView.
void	setAlpha(float alpha) Sets the opacity of the view to a value from 0 to 1, where 0 means the view is completely transparent and 1 means the view is completely opaque.
void	setChildSurfacePackage(SurfaceControlViewHost.SurfacePackage p) Display the view-hierarchy embedded within a SurfaceControlViewHost.SurfacePackage within this SurfaceView.
void	setClipBounds(Rect clipBounds) Sets a rectangular area on this view to which the view will be clipped when it is drawn.
void	setSecure(boolean isSecure) Control whether the surface view's content should be treated as secure, preventing it from appearing in screenshots or from being viewed on non-secure displays.
void	setVisibility(int visibility) Set the visibility state of this view.
void	setZOrderMediaOverlay(boolean isMediaOverlay) Control whether the surface view's surface is placed on top of another regular surface view in the window (but still behind the window itself).
void	setZOrderOnTop(boolean onTop) Control whether the surface view's surface is placed on top of its window.

SurfaceView Protected methods Class Parameters類參數屬性：

Protected methods
void	dispatchDraw(Canvas canvas) Called by draw to draw the child views.
void	onAttachedToWindow() This is called when the view is attached to a window.
void	onDetachedFromWindow() This is called when the view is detached from a window.
void	onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) Called by the view system when the focus state of this view changes.
void	onMeasure(int widthMeasureSpec, int heightMeasureSpec) Measure the view and its content to determine the measured width and the measured height.
Void	onWindowVisibilityChanged(int visibility) Called when the window containing has change its visibility (between GONE, INVISIBLE, and VISIBLE).

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