在写Tablayout时候,发现不能设置下划线的长度,使用反射的方式,修改了长度

    private void settab() throws NoSuchFieldException, IllegalAccessException {
        Class tablayout = mDetailTablayout.getClass();
        Field tabStrip = tablayout.getDeclaredField("mTabStrip");
        tabStrip.setAccessible(true);
        LinearLayout ll_tab = (LinearLayout) tabStrip.get(mDetailTablayout);
        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);
            params.setMarginStart(UiUtils.dip2px(mActivity, 25f));
            params.setMarginEnd(UiUtils.dip2px(mActivity, 25f));
            child.setLayoutParams(params);
            child.invalidate();
        }
    }

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