常用FontWeight值
<?xml version="1.0" encoding="utf-8"?>
<resources><integer name="font_weight_Thin">100</integer><integer name="font_weight_ExtraLight">200</integer><integer name="font_weight_Light">300</integer><integer name="font_weight_SemiLight">350</integer><integer name="font_weight_Regular">400</integer><integer name="font_weight_Medium">500</integer><integer name="font_weight_SemiBold">600</integer><integer name="font_weight_Bold">700</integer><integer name="font_weight_ExtraBold">800</integer><integer name="font_weight_Heavy">900</integer><integer name="font_weight_Ultra">950</integer>
</resources>
设置FontWeight
不是所有字体都支持FontWeight，单独设置FontWeight无效时，还需要设置FontFamily
<TextViewandroid:textFontWeight="500"android:fontFamily="sans-serif" />
