tablayout下划线宽度

/**
 * 设置tab下划线宽度
 * @param tabLayout
 */
public void reflex(final TabLayout tabLayout){
    //了解源码得知 线的宽度是根据 tabView的宽度来设置的
    tabLayout.post(new Runnable() {
        @Override
        public void run() {
            try {
                //拿到tabLayout的mTabStrip属性
                LinearLayout mTabStrip = (LinearLayout) tabLayout.getChildAt(0);
                int dp10 = dip2px(tabLayout.getContext(), 10);
                for (int i = 0; i < mTabStrip.getChildCount(); i++) {
                    View tabView = mTabStrip.getChildAt(i);
                    //拿到tabView的mTextView属性  tab的字数不固定一定用反射取mTextView
                    Field mTextViewField = tabView.getClass().getDeclaredField("mTextView");
                    mTextViewField.setAccessible(true);
                    TextView mTextView = (TextView) mTextViewField.get(tabView);
                    tabView.setPadding(0, 0, 0, 0);
                    //因为我想要的效果是   字多宽线就多宽，所以测量mTextView的宽度
                    int width = 0;
                    width = mTextView.getWidth();
                    if (width == 0) {
                        mTextView.measure(0, 0);
                        width = mTextView.getMeasuredWidth();
                    }
                    //设置tab左右间距为10dp  注意这里不能使用Padding 因为源码中线的宽度是根据 tabView的宽度来设置的
                    LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) tabView.getLayoutParams();
                    params.width = width ;
                    params.leftMargin = dp10;
                    params.rightMargin = dp10;
                    tabView.setLayoutParams(params);
                    tabView.invalidate();
                }
            } catch (NoSuchFieldException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {

                e.printStackTrace();
            }
        }
    });
}