Android(安卓)ImageView.ScaleType详解
联网获取到商品图片，显示时发现大小不合理，查资料发现得设置ScaleType属性：
<ImageView android:id="@+id/grid_item_mainpage_web_image" android:layout_width="match_parent" android:layout_height="match_parent" android:scaleType="fitXY" android:src="@drawable/shop_img_default" />关于这个属性，Android Developer 解释如下，顺便从别人博客里找了点通俗易懂的国语版：
public static finalImageView.ScaleTypeCENTER
Added in API level 1Center the image in the view, but perform no scaling. From XML, use this syntax:android:scaleType="center".
按图片的本来的大小居中显示，如果图片宽(高)超过View的宽(高)，则截取图片的居中部分显示
public static finalImageView.ScaleTypeCENTER_CROP
Added in API level 1 Scale the image uniformly (maintain the image's aspect ratio) so that both dimensions (width and height) of the image will be equal to or larger than the corresponding dimension of the view (minus padding). The image is then centered in the view. From XML, use this syntax:android:scaleType="centerCrop".
按比例扩大图片到宽(高)等于或大于View的宽(高)，并截取图片的居中部分显示 public static finalImageView.ScaleTypeCENTER_INSIDE
Added in API level 1 Scale the image uniformly (maintain the image's aspect ratio) so that both dimensions (width and height) of the image will be equal to or less than the corresponding dimension of the view (minus padding). The image is then centered in the view. From XML, use this syntax:android:scaleType="centerInside".
按比例缩小图片到宽(高)等于或小于View的宽(高)，并居中显示
public static finalImageView.ScaleTypeFIT_CENTER
Added in API level 1Scale the image usingCENTER. From XML, use this syntax:android:scaleType="fitCenter".
按比例缩放图片到宽度等于View的宽度，并居中显示
public static finalImageView.ScaleTypeFIT_END
Added in API level 1Scale the image usingEND. From XML, use this syntax:android:scaleType="fitEnd".
按比例缩放图片到宽度等于View的宽度，并显示在View的底部
public static finalImageView.ScaleTypeFIT_START
Added in API level 1Scale the image usingSTART. From XML, use this syntax:android:scaleType="fitStart".
按比例缩放图片到宽度等于View的宽度，并显示在View的顶部
public static finalImageView.ScaleTypeFIT_XY
Added in API level 1Scale the image usingFILL. From XML, use this syntax:android:scaleType="fitXY".
不按比例缩放图片，使图片的宽高等于View的宽高，填满View
public static finalImageView.ScaleTypeMATRIX
Added in API level 1Scale using the image matrix when drawing. The image matrix can be set usingsetImageMatrix(Matrix). From XML, use this syntax:android:scaleType="matrix".
用矩阵来绘制图片(从左上角起)，动态缩小或放大图片
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