android学习笔记(一）---shape属性

之前接触这些个style的东西，都只是拿来用用，没怎么深入去记得，导致昨天被一个小问题困扰了很久。所以，今天打算把这些知识理一理。

本来想去找下资源的那些属性API，可惜找了很久还是没有找到原版的，只能在别人的基础上修改下吧，见谅啊！！！

Shape Drawable

这一类的shape定义在xml中

file location:

res/drawable/filename.xml

The filename is used as the resource ID.（这个文件名作为资源id）
compiled resource datatype:（复杂资源的数据类型）
Resource pointer to a

GradientDrawable

.
resource reference（资源参考）:
In Java:

R.drawable.filename

In XML:

@[package:]drawable/filename

元素:

<shape>

The shape drawable. This must be the root element.

attributes:

xmlns:android

String. Required. Defines the XML namespace, which must be

"http://schemas.android.com/apk/res/android"

.

android:shape

Keyword. Defines the type of shape. Valid values are:（定义这个类型的形状，变量值是：）

Value	Desciption
"rectangle"	A rectangle （长方形）that fills the containing View. This is the default shape.（这个是默认的形状）
"oval"	An oval （椭圆形）shape that fits the dimensions of the containing View.
"line"	A horizontalline that spans the width of the containing View. This shape requires the <stroke> element to define the width of the line.
"ring"	A ring shape.

The following attributes are used only when

android:shape="ring"

:

android:innerRadius

Dimension. The radius for the inner part of the ring (the hole in the middle), as a dimension value or dimension
resource.

android:innerRadiusRatio

Float. The radius for the inner part of the ring, expressed as a ratio of the ring's width. For instance, if

android:innerRadiusRatio="5"

, then the inner radius equals the ring's width divided
by 5. This value is overridden by

android:innerRadius

. Default value is 9.

android:thickness

Dimension. The thickness of the ring, as a dimension value or dimension resource.

android:thicknessRatio

Float. The thickness of the ring, expressed as a ratio of the ring's width. For instance, if

android:thicknessRatio="2"

, then the thickness equals the ring's width divided by 2. This value is
overridden by

android:innerRadius

. Default value is 3.

android:useLevel

Boolean. "true" if this is used as a

LevelListDrawable

.
This should normally be "false" or your shape may not appear.

<corners>

Creates rounded corners for the shape. Applies only when the shape is a rectangle.创建圆角的形状。仅适用于当其形状是一个长方形。

attributes:

android:radius

Dimension. The radius for all corners, as a dimension value or dimension
resource. This is overridden for each corner by the following attributes.

android:topLeftRadius

Dimension. The radius for the top-left corner, as a dimension value or dimension
resource.

android:topRightRadius

Dimension. The radius for the top-right corner, as a dimension value or dimension
resource.

android:bottomLeftRadius

Dimension. The radius for the bottom-left corner, as a dimension value or dimension
resource.

android:bottomRightRadius

Dimension. The radius for the bottom-right corner, as a dimension value or dimension
resource.

Note: Every corner must (initially) be provided a corner radius greater than 1, or else no corners are rounded. If you want specific corners to notbe rounded, a work-around is to use

android:radius

to
set a default corner radius greater than 1, but then override each and every corner with the values you really want, providing zero ("0dp") where you don't want rounded corners.

<gradient>

Specifies a gradient color for the shape.指定一个渐变颜色的形状。

attributes:

android:angle

Integer. The angle for the gradient, in degrees. 0 is left to right, 90 is bottom to top. It must be a multiple of 45. Default is 0.

android:centerX

Float. The relative X-position for the center of the gradient (0 - 1.0).

android:centerY

Float. The relative Y-position for the center of the gradient (0 - 1.0).

android:centerColor

Color. Optional color that comes between the start and end colors, as a hexadecimal value or color
resource.

android:endColor

Color. The ending color, as a hexadecimal value or color resource.

android:gradientRadius

Float. The radius for the gradient. Only applied when

android:type="radial"

.

android:startColor

Color. The starting color, as a hexadecimal value or color resource.

android:type

Keyword. The type of gradient pattern to apply. Valid values are:

Value	Description
"linear"	A linear gradient. This is the default.
"radial"	A radial gradient. The start color is the center color.
"sweep"	A sweeping line gradient.

android:useLevel

Boolean. "true" if this is used as a

LevelListDrawable

.

<padding>

Padding to apply to the containing View element (this pads the position of the View content, not the shape).适用于包含填充视图元素(这垫的位置,而不是观点内容的形状)

attributes:

android:left

Dimension. Left padding, as a dimension value or dimension resource.

android:top

Dimension. Top padding, as a dimension value or dimension resource.

android:right

Dimension. Right padding, as a dimension value or dimension resource.

android:bottom

Dimension. Bottom padding, as a dimension value or dimension resource.

<size>

The size of the shape.

attributes:

android:height

Dimension. The height of the shape, as a dimension value or dimension resource.

android:width

Dimension. The width of the shape, as a dimension value or dimension resource.

Note: The shape scales to the size of the container View proportionate to the dimensions defined here, by default. When you use the shape in an

ImageView

,
you can restrict scaling by setting the

android:scaleType

to

"center"

.

<solid>

A solid color to fill the shape.

attributes:

android:color

Color. The color to apply to the shape, as a hexadecimal value or color resource.

<stroke>

A stroke line for the shape.

attributes:

android:width

Dimension. The thickness of the line, as a dimension value or dimension resource.

android:color

Color. The color of the line, as a hexadecimal value or color resource.

android:dashGap

Dimension. The distance between line dashes, as a dimension value or dimension
resource. Only valid if

android:dashWidth

is set.

android:dashWidth

Dimension. The size of each dash line, as a dimension value or dimension
resource. Only valid if

android:dashGap

is set.

gradient -- 对应颜色渐变。 startcolor、endcolor就不多说了。 android:angle 是指从哪个角度开始变。

gradient：渐变

android:startColor和android:endColor分别为起始和结束颜色，android:angle是渐变角度，必须为45的整数倍。

另外渐变默认的模式为android:type="linear"，即线性渐变，可以指定渐变为径向渐变，android:type="radial"，径向渐变需要指定半径android:gradientRadius="50"。

solid -- 填充。

solid：实心，就是填充的意思

android:color指定填充的颜色

stroke -- 描边。

stroke：描边

android:width="2dp" 描边的宽度，android:color 描边的颜色。

我们还可以把描边弄成虚线的形式，设置方式为：

android:dashWidth="5dp"

android:dashGap="3dp"

其中android:dashWidth表示'-'这样一个横线的宽度，android:dashGap表示之间隔开的距离。

corners -- 圆角。

corners：圆角

android:radius为角的弧度，值越大角越圆。

我们还可以把四个角设定成不同的角度，方法为：

<corners

android:topRightRadius="20dp" 右上角

android:bottomLeftRadius="20dp" 右下角

android:topLeftRadius="1dp" 左上角

android:bottomRightRadius="0dp" 左下角

/>

这里有个地方需要注意，bottomLeftRadius是右下角，而不是左下角，这个不要记错了。

padding -- 定义内容离边界的距离。 与android:padding_left、android:padding_right这些是一个道理。

/article/5122005.html

android:angle网上有各种说法，这里，我说说自己的实验结果，渐变的时候，最原始的，即android:angle＝“0”时，是从左到右，按照开始颜色到结束颜色来渲染的，android:angle＝“90”是从上到下来渲染的，android:angle＝“180”是从右到左来渲染的，android:angle＝“360”和android:angle＝“0”是一样的，所以这里应该是这样的，渲染时按照最原始的渲染色板（把控件内部看作一块可以绕中心旋转的板子）围绕控件中心来旋转相应的度数，即android:angle里面的值就是所需要旋转的角度，只是这个旋转角度必须是45的整数倍

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