View属性小结

待改进

标识类属性

1. android:id:Supply an identifier name for this view, to later retrieve it with View.findViewById() or Activity.findViewById(). [reference]:提供一个标识符名称给这个组件，后面可以通过：View.findViewById()或者Activity.findViewById()来获取这个组件。

   方法：

   • setId(int)

2. android:tag:Supply a tag for this view containing a String, to be retrieved later with View.getTag() or searched for with View.findViewWithTag() . [string]:这个属性和android:id的作用和用法一样，api上建议使用android:id原因是id更快而且支持编译时类型的检查(It is generally preferable to use IDs (through the android:id attribute) instead of tags because they are faster and allow for compile-time type checking.)

3. android:contentDescription:Defines text that briefly describes content of the view. [string]:定义一个文本来暂时描述这个控件

位置类属性

1. scrollX/Y:The initial vertical/horizontal scroll offset, in pixels. [dimension]:初始的垂直/水平 滚动偏移量，像素为单位

2. padding:Sets the padding, in pixels, of all four edges. [dimension]:设置四面的外边距，以像素为单位,控件的大小是包括了padding的，padding可以覆盖背景

   方法

   • setPaddingRelative(int,int,int,int)

3. paddingTop/Bottom/Left/Right/End/Start:Sets the padding, in pixels, of the left// edge; see padding. [dimension]

   方法

   • setPaddingRelative(int,int,int,int)

4. android:fitsSystemWindows:Boolean internal attribute to adjust view layout based on system windows such as the status bar. [boolean]:是否要更具系统的窗口的改变(比如是否有状态栏)而改变控件的内部属性；

5. translationX/Y:translation in x/y of the view. [dimension]:改变位置？

   方法

   • setTranslation(float)

6. android:layoutDirection:Defines the direction of layout drawing. [enum]：定义控件的绘制方向

   属性值

   • ltr:0,Left-to-Right
   • rtl:1,Right-to-Left
   • inherit:3,Inherit from parent
   • locale:3,Locale

外观类属性

1. android:background:A drawable to use as the background. [color, reference]：将一个可绘制的东西作为背景

   方法：

   • setBackgroundResource(int)

2. android:visibility:Controls the initial visibility of the view. [enum]:设置控件舒适化是是否可见

   属性值

   1. visibile：0,Visible on screen; the default value.可见，默认值
   2. invisibile:1,Not displayed, but taken into account during layout (space is left for it).不可见，但是占据地方
   3. gone,2,Completely hidden, as if the view had not been added.完全隐藏，控件不会添加到布局中。

   方法

   • setVisibility(int)

3. android:scrollbars:Defines which scrollbars should be displayed on scrolling or not. [flag]：定义哪个滚动条滚动(是可滚动还是显示？)

   1. none：0x00000000，No scrollbar is displayed.
   2. horizontal：0x00000100，Displays horizontal scrollbar only.
   3. vertical：0x00000200，Displays vertical scrollbar only.

4. android:scrollbarStyle:Controls the scrollbar style and position. [enum]:控制滚动条的风格和位置

   1. insideOverlay：0x0，Inside the padding and overlaid
   2. insideinset：0x01000000，Inside the padding and inset
   3. outsideOverlay：0x02000000，Edge of the view and overlaid
   4. outsideinset：0x03000000，Edge of the view and inset

   方法

   • setScrollBarStyle(int)

5. android:fadeScrollbars:Defines whether to fade out scrollbars when they are not in use. [boolean]:定义是否要做模糊处理对于没有使用的滚动条

   方法

   • setScrollbarFadingEnable(boolean)

6. android:scrollbarFadeDuration:Defines the delay in milliseconds that a scrollbar takes to fade out. [integer]：设置滚动条fade out过程话费的时间

   方法

   • setScrollBarFadeDuration(int)

7. android:scrollbarDefaultDelayBeforeFade:Defines the delay in milliseconds that a scrollbar waits before fade out. [integer]:设置滚动条fade out 延迟的时间

   方法

   • setScrollBarDefaultDelayBeforeFade(int)

8. android:scrollbarSize:Sets the width of vertical scrollbars and height of horizontal scrollbars. [dimension]:设置水平滚动条的高度或者垂直滚动条的宽度。

   方法

   • setScorllBarSize(int)

9. android:scrollbarTrackHorizontal/Vertical:Defines the horizontal/vertical scrollbar track drawable. [reference]:定义轨迹

10. android:requiresFadingEdge:Defines which edges should be faded on scrolling. [flag]：定义哪个边缘应该被模糊处理在滚动的时候

    属性值

    • none：0x00000000，No edge is faded.
    • horizontal：0x00001000，Fades horizontal edges only.
    • vertical：0x00002000，Fades vertical edges only.

    方法

    • setVerticalFadingEdgeEnabled(boolean)
    • setHorizontalFadingEdgeEnabled(boolean)

11. android:fadingEdgeLength:Defines the length of the fading edges. [dimension]:定义边缘填充的长度

    方法

    • getVerticalFadingEdgeLength()

12. android:keepScreenOn:Controls whether the view's window should keep the screen on while visible. [boolean]:设置控件是否能够保持屏幕常亮

    方法

    • setKeepScreenOn(boolean)

13. android:minHeight:Defines the minimum height of the view.：定义控件的最小高度

    方法

    • setMinimunHeight(int)

14. android:minWidth:Defines the minimum width of the view.：定义控件的最小宽度

    方法

    • setMinimunWidth(int)

15. android:alpha:alpha property of the view, as a value between 0 (completely transparent) and 1 (completely opaque). [float]:设置控件的透明度(值 0-1)

    方法

    • setAlpha(float)

16. android:rotation:rotation of the view, in degrees. [float]：设置控件的旋转角度

    方法

    • serRotation(float)

17. android:rotationX/Y:rotation of the view around the x/y axis, in degrees. [float]:设置旋转的中心

    方法

    • setRotationX(float)
    • setRotationY(float)

18. android:scaleX/Y:scale of the view in the x/y direction. [float]:设置控件在某个方向上的大小

    方法

    • setScaleX(float)

19. textDirection:Defines the direction of the text. [integer, enum]

    1. inherit:0,Default
    2. firstStrong:1,
    3. anyRtl:2,
    4. ltr:3,
    5. rtl:4,
    6. locale:5,
    7. firstStrongLtr:6,
    8. firstStrongRtl:7,

20. android:textAlignment:Defines the alignment of the text. [integer, enum]:定义控件中文本的对齐方式

    1. inherit：0，Default
    2. vertical：1，
    3. textStart：2，
    4. textEnd：3，
    5. center：4，
    6. viewStart:5,
    7. viewEnd:6,

    方法

    • setTextAlignment(int)

焦点、动作

1. android:focusable：Boolean that controls whether a view can take focus. [boolean]：设置控件能否接收焦点

   方法

   • setFocusable(boolean)

2. focusableInTouchMode:Boolean that controls whether a view can take focus while in touch mode. [boolean]:设置控件能否能够获得焦点在触摸模式下

   方法

   • setFocusableInTouchMode(boolean)

3. android:nextFocusLeft:Defines the next view to give focus to when the next focus is FOCUS_LEFT. [reference]:定义当按下左的时候下一个获得焦点的控件

   方法

   • setNextFocusLeftId(int);

4. android:nextFocusForward/Right/Up/Bottom:Defines the next view to give focus to when the next focus is FOCUS_RIGHT If the reference refers to a view that does not exizst or is part of a hierarchy that is invisible, a java.lang.RuntimeException will result when the reference is accessed. [reference]

   方法

   • setNextFocusRightId(int)
   • setNextFocusUpId(int)
   • setNextFocusForward(int)
   • setNextFocusBottom(int)

5. android:clickable:Defines whether this view reacts to click events. [boolean]:定义这个控件能否触发点击事件

   方法

   • setClickable(boolean)

6. android:longClickable:Defines whether this view reacts to long click events. [boolean]:定义控件是否可以反馈长点击事件

   方法

   • setLongClickable(boolean)

7. android:duplicateParentState:When this attribute is set to true, the view gets its drawable state (focused, pressed, etc.) from its direct parent rather than from itself. [boolean]:控制控件的状态(焦点，按压)是否由父控件决定

8. android:onClick:Name of the method in this View's context to invoke when the view is clicked. [string]：当控件被点击的时候能否被环境所调用，For instance, if you specify android:onClick="sayHello", you must declare a public void sayHello(View v) method of your context (typically, your Activity).

9. android:longClickable:Defines whether this view reacts to long click events. [boolean]：定义这个控件是否可以有长按的事件反馈

   方法

   • setLongClickable(boolean)

动画

性能类属性

2. scrollbarAlwaysDrawHorizontal(Vertical)Track:Defines whether the horizontal(vertical) scrollbar track should always be drawn. [boolean]：定义水平/垂直 滚动条是否要一直被绘制

3. android:saveEnabled:If unset, no state will be saved for this view when it is being frozen. [boolean]:设置控件的状态是否能被保存。

   方法

   • setSaveEnable(boolean)

4. drawingCacheQuality:Defines the quality of translucent drawing caches. [enum]：定义透明绘制的缓冲特性

   1. auto:0,Lets the framework decide what quality level should be used for the drawing cache.(默认值)
   2. low:1,Low quality. When set to low quality, the drawing cache uses a lower color depth, thus losing precision in rendering gradients, but uses less memory.
   3. high:2,High quality. When set to high quality, the drawing cache uses a higher color depth but uses more memory.

   方法

   • setDrawingCacheQuality(int)

5. android:layerType:Specifies the type of layer backing this view. [enum] (硬件加速？)

   1. none:0,Don't use a layer.
   2. software:1,Use a software layer. Refer to setLayerType(int, android.graphics.Paint) for more information.
   3. hardware:2,Use a hardware layer. Refer to setLayerType(int, android.graphics.Paint) for more information.

   方法

   • setLayerType(int,Paint)

功能属性

1. android:soundEffectsEnabled:Boolean that controls whether a view should have sound effects enabled for events such as clicking and touching. [boolean]：设置控件在点击和触摸的时候是否有声音的反馈

   方法

   • setSoundEffectsEnabled(boolean)

2. android:hapticFeedbackEnabled:Boolean that controls whether a view should have haptic feedback enabled for events such as long presses. [boolean] ：定义控件是否有haptic feedback对于一些事件

   方法

   • setHapticFeedbackEnabled(boolean)

3. android:filterTouchesWhenObscured:Specifies whether to filter touches when the view's window is obscured by another visible window. [boolean]:设置当控件被其他控件覆盖的时候能否反馈触碰操作

   方法

   • setFilterTouchesWhenObscured(boolean)

4. android:accessibilityLiveRegion:Indicates to accessibility services whether the user should be notified when this view changes. [integer, enum]：表明当控件改变的时候是否要让用户知道

   属性值

   • none:0
   • polite:1
   • assertive:2

   方法

   • setAccessibilityLiveRegion(int)