Shape Drawable Xml的background
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Shape Drawable Xml的background
SuShine 发表于3年前
Shape Drawable Xml的background
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<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >


    <stroke
        android:width="0.5dip"
        android:color="#ff505050" />


    <corners android:radius="2dip" >
    </corners>


	<gradient android:startColor="#ff404040"
	    android:centerColor="#ff383838"
	    android:endColor="#ff404040"
	    />
</shape>




This is a generic shape defined in XML.

file location:
res/drawable/filename.xml
The filename is used as the resource ID.
compiled resource datatype:
Resource pointer to a  GradientDrawable.
resource reference:
In Java:  R.drawable.filename
In XML:  @[package:]drawable/filename
syntax:
<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape=["rectangle" | "oval" | "line" | "ring"] > <corners android:radius="integer" android:topLeftRadius="integer" android:topRightRadius="integer" android:bottomLeftRadius="integer" android:bottomRightRadius="integer" /> <gradient android:angle="integer" android:centerX="integer" android:centerY="integer" android:centerColor="integer" android:endColor="color" android:gradientRadius="integer" android:startColor="color" android:type=["linear" | "radial" | "sweep"] android:useLevel=["true" | "false"] /> <padding android:left="integer" android:top="integer" android:right="integer" android:bottom="integer" /> <size android:width="integer" android:height="integer" /> <solid android:color="color" /> <stroke android:width="integer" android:color="color" android:dashWidth="integer" android:dashGap="integer" /> </shape>
elements:
<shape>
The shape drawable. This must be the root element.

attributes:

xmlns:android
StringRequired. 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:
Value Desciption
"rectangle" A rectangle that fills the containing View. This is the default shape.
"oval" An oval shape that fits the dimensions of the containing View.
"line" A horizontal line 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.

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 not be rounded, a work-around is to use android:radiusto 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.

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).

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 theandroid: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.
example:
XML file saved at  res/drawable/gradient_box.xml:
<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> <gradient android:startColor="#FFFF0000" android:endColor="#80FF00FF" android:angle="45"/> <padding android:left="7dp" android:top="7dp" android:right="7dp" android:bottom="7dp" /> <corners android:radius="8dp" /> </shape>

This layout XML applies the shape drawable to a View:

<TextView android:background="@drawable/gradient_box" android:layout_height="wrap_content" android:layout_width="wrap_content" />

This application code gets the shape drawable and applies it to a View:

Resources res = getResources();
Drawable shape = res. getDrawable(R.drawable.gradient_box);

TextView tv = (TextView)findViewByID(R.id.textview);
tv.setBackground(shape);
see also:
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