tabLayout改变下划线的宽度

tabLayout.post(new Runnable() {    @Override    public void run() {        try {            //拿到tabLayout的mTabStrip属性            Field mTabStripField = tabLayout.getClass().getDeclaredField("mTabStrip");            mTabStripField.setAccessible(true);            LinearLayout mTabStrip = (LinearLayout) mTabStripField.get(tabLayout);            for (int i = 0; i < mTabStrip.getChildCount(); i++) {                View tabView = mTabStrip.getChildAt(i);                //拿到tabView的mTextView属性                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();                int dp10 = DensityUtil.dip2px(picActivity, 40);                params.width = width ;                params.leftMargin = dp10;                params.rightMargin = dp10;                tabView.setLayoutParams(params);                tabView.invalidate();            }        } catch (NoSuchFieldException e) {            e.printStackTrace();        } catch (IllegalAccessException e) {            e.printStackTrace();        }    }});