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定义一个ScaleDrawable

<?xml version="1.0" encoding="utf-8"?><scale xmlns:android="class="pln">    android:drawable="@drawable/logo"    android:scaleGravity="center_verticalcenter_horizontal"    android:scaleHeight="80%" //示意从高度80% 开初缩放,80%为图片高度最小值。level 0弗成见。    android:scaleWidth="80%"/> //暗示从宽度80% 开端缩放,80%为图片宽度最小值。level 0不成睹。
参考:


    文件地位:
    res/drawable/filename.xml
    文件名即资本名
    编译数据类型:
    指背 的指针。
    资源引用:
    In Java: R.drawable.filename
    In XML: @[package:]drawable/filename
    语法:
    <?xml version="1.0" encoding="utf-8"?><scale xmlns:android="   android:scaleWidth="50%"    android:scaleHeight="50%"    android:drawable="@drawable/image1"     android:scaleGravity="center_verticalcenter_horizontal"    ></scale>

    在layout中应用:

     ImageView imageView=(ImageView)findViewById(R.id.imgView);        ScaleDrawable scaleDrawable=(ScaleDrawable)imageView.getDrawable();        scaleDrawable.setLevel(1);  //level 1的时辰便是50%
            //scaleDrawable.setLevel(0); //level 0不行见

    示例:

    对另外一个drawable资源,基于当前的level,停止尺寸变更的drawable。


    在scale.xml中:

    必须是上面的一个或多个值(多个值之间用”“分开),下里的值和描写跟上一篇的ClipDrawable一样。



        <ImageView         android:id="@+id/imgView"        android:src="@drawable/scale"        android:layout_width="wrap_content"        android:layout_height="wrap_content"/>

    正在代码中设置level:

    <?xml version="1.0" encoding="utf-8"?><    xmlns:android="class="pln">    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" />
    元素:
    <scale>
    定义一个ScaleDrawable,必须做为根元素。

    属性:

    描述
    topPut the object at the top of its container, not changing its size.
    bottomPut the object at the bottom of its container, not changing its size.
    leftPut the 广州羊城搬家 object at the left edge of its container, not changing its size. This is thedefault.
    rightPut the object at the right edge of its container, not changing its size.
    center_verticalPlace object in the vertical center of its container, not changing its size.
    fill_verticalGrow the vertical size of the object if needed so it completely fills its container.
    center_horizontalPlace object in the horizontal center of its container, not changing its size.
    fill_horizontalGrow the horizontal size of the object if needed so it completely fills its container.
    centerPlace the object in the center of its container in both the vertical and horizontal axis, notchanging its size.
    fillGrow the horizontal and vertical size of the object if needed so it completely fills itscontainer.
    clip_verticalAdditional option that can be set to have the top and/or bottom edges of the child clipped toits container's bounds. The clip is based on the vertical gravity: a top gravity clips thebottom edge, a bottom gravity clips the top edge, and neither clips both edges.
    clip_horizontalAdditional option that can be set to have the left and/or right edges of the child clipped toits container's bounds. The clip is based on the horizontal gravity: a left gravity clipsthe right edge, a right gravity clips the left edge, and neither clips both edges.
    android:scaleHeight
    Percentage(百分比)缩放的下度,以百分比的圆式默示drawable的缩放。形式例如:100%,12.5%。
    android:scaleWidth
    Percentage(百分比)缩放的宽度,以百分比的方法表现drawable的缩放。情势比方:100%,12.5%。
    示例:
    xmlns:android
    String范例。 必需的。界说XML文件的定名空间。必需是 "资本。必须的。援用一个drawable资源。
    android:scaleGravity
    要害字。指定缩放后的gravity的位置。

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