字体颜色大小改变的 indicator
mTabLayout = (ScaleTabLayout) findViewById(R.id.layout_tab);
mTabLayout.setViewPager(mViewPager);
<declare-styleable name="ScaleLayout">
<attr name="bottom_color" format="color|reference" />
<attr name="bottom_height" format="dimension" />
<attr name="line_right" format="dimension" />
<attr name="line_left" format="dimension" />
<attr name="line_bottom" format="dimension" />
<attr name="fit_text" format="boolean" />
</declare-styleable>