Drawable资源之ScaleDrawable资源

A drawable defined in XML that changes the size of another drawable based on its current level.

file location:

res/drawable/filename.xml
The filename is used as the resource ID.

compiled resource datatype:

Resource pointer to a ScaleDrawable.

resource reference:

In Java: R.drawable.filename
In XML: @[package:]drawable/filename

syntax:

<?xml version="1.0" encoding="utf-8"?>
<scale
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:drawable="@drawable/drawable_resource"
    android:scaleGravity=["top" | "bottom" | "left" | "right" | "center_vertical" |
                          "fill_vertical" | "center_horizontal" | "fill_horizontal" |
                          "center" | "fill" | "clip_vertical" | "clip_horizontal"]
    android:scaleHeight="percentage"
    android:scaleWidth="percentage" />

elements:

<scale>

Defines the scale 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:drawable

Drawable resource. Required. Reference to a drawable resource.

android:scaleGravity

Keyword. Specifies the gravity position after scaling.

Must be one or more (separated by '|') of the following constant values:

Value Description

`top`	Put the object at the top of its container, not changing its size.
`bottom`	Put the object at the bottom of its container, not changing its size.
`left`	Put the object at the left edge of its container, not changing its size. This is the default.
`right`	Put the object at the right edge of its container, not changing its size.
`center_vertical`	Place object in the vertical center of its container, not changing its size.
`fill_vertical`	Grow the vertical size of the object if needed so it completely fills its container.
`center_horizontal`	Place object in the horizontal center of its container, not changing its size.
`fill_horizontal`	Grow the horizontal size of the object if needed so it completely fills its container.
`center`	Place the object in the center of its container in both the vertical and horizontal axis, not changing its size.
`fill`	Grow the horizontal and vertical size of the object if needed so it completely fills its container.
`clip_vertical`	Additional option that can be set to have the top and/or bottom edges of the child clipped to its container's bounds. The clip is based on the vertical gravity: a top gravity clips the bottom edge, a bottom gravity clips the top edge, and neither clips both edges.
`clip_horizontal`	Additional option that can be set to have the left and/or right edges of the child clipped to its container's bounds. The clip is based on the horizontal gravity: a left gravity clips the right edge, a right gravity clips the left edge, and neither clips both edges.

android:scaleHeight

Percentage. The scale height, expressed as a percentage of the drawable's bound. The value's format is XX%. For instance: 100%, 12.5%, etc.

android:scaleWidth

Percentage. The scale width, expressed as a percentage of the drawable's bound. The value's format is XX%. For instance: 100%, 12.5%, etc.

example:

<?xml version="1.0" encoding="utf-8"?>
<scale xmlns:android="http://schemas.android.com/apk/res/android"
    android:drawable="@drawable/logo"
    android:scaleGravity="center_vertical|center_horizontal"
    android:scaleHeight="80%"
    android:scaleWidth="80%" />

Drawable资源之ScaleDrawable资源

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