http://v.youku.com/v_show/id_XMTczMzQwNTM5Ng==.html
<string name="matrix">MATRIX</string>
<string name="fit_xy">FIT_XY</string>
<string name="fit_start">FIT_START</string>
<string name="fit_center">FIT_CENTER</string>
<string name="fit_end">FIT_END</string>
<string name="center">CENTER</string>
<string name="center_crop">CENTER_CROP</string>
<string name="center_inside">CENTER_INSIDE</string>