TabLayout更改下划线长度和内容保持一致

先上效果图

主要是通过反射强制修改每个子Tab的左右边距，代码很简单，一看就明了

下面献上代码

 public void setTabLine(TabLayout tab,int left,int right){
    try {
        Class<?> tablayout = tab.getClass();
        Field tabStrip = tablayout.getDeclaredField("mTabStrip");
        tabStrip.setAccessible(true);
        LinearLayout ll_tab= (LinearLayout) tabStrip.get(tabLayout);
        for (int i = 0; i < ll_tab.getChildCount(); i++) {
            View child = ll_tab.getChildAt(i);
            child.setPadding(0,0,0,0);
            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.MATCH_PARENT,1);
            //修改两个tab的间距
            params.setMarginStart(BasicUtils.dip2px(context,left));
            params.setMarginEnd(BasicUtils.dip2px(context,right));
            child.setLayoutParams(params);
            child.invalidate();
        }
    } catch (NoSuchFieldException e) {
        e.printStackTrace();
        Log.e(TAG,e.toString());
    } catch (IllegalAccessException e) {
        e.printStackTrace();
        Log.e(TAG,e.toString());
    }
}

注意1：Tablayout的Mode必须得设置为fixed,否则会滑动
示例：app:tabMode=”fixed”

注意2：Tablayout的宽不能写死，得设置为包裹内容