使用XML绘制 Bitmap的定义

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<!-- Drawable used to draw bitmaps. -->
    <declare-styleable name="BitmapDrawable">
        <!-- Identifier of the bitmap file. This attribute is mandatory. -->
        <attr name="src" />
        <!-- Enables or disables antialiasing. -->
        <attr name="antialias" format="boolean" />
        <!-- Enables or disables bitmap filtering. Filtering is used when the bitmap is
             shrunk or stretched to smooth its apperance. -->
        <attr name="filter" format="boolean" />
        <!-- Enables or disables dithering of the bitmap if the bitmap does not have the
             same pixel configuration as the screen (for instance: a ARGB 8888 bitmap with
             an RGB 565 screen). -->
        <attr name="dither" />
        <!-- Defines the gravity for the bitmap. The gravity indicates where to position
             the drawable in its container if the bitmap is smaller than the container. -->
        <attr name="gravity" />
        <!-- Defines the tile mode. When the tile mode is enabled,the bitmap is repeated.
             Gravity is ignored when the tile mode is enabled. -->
        <attr name="tileMode">
            <!-- Do not tile the bitmap. This is the default value. -->
            <enum name="disabled" value="-1" />
            <!-- Replicates the edge color. -->
            <enum name="clamp" value="0" />
            <!-- Repeats the bitmap in both direction. -->
            <enum name="repeat" value="1" />
            <!-- Repeats the shader's image horizontally and vertically,alternating
                 mirror images so that adjacent images always seam. -->
            <enum name="mirror" value="2" />
        </attr>
    </declare-styleable>

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