Android的API28版本TabLayout改变下划线长度为文本长度

因需求需要改变TabLayout下划线的宽度，在网上查找的方法设置后没有效果，最后查看源码发现API28版本后mTabStrip被更改为slidingTabIndicator、mTextView被更改为textView。将这两个替换后，就可以实现下划线宽度与文本长度相同的功能了。代码如下:

public static void reflex(final TabLayout tabLayout){
        tabLayout.post(() -> {
            try {
                //拿到tabLayout的slidingTabIndicator属性
                Field tabIndicator = tabLayout.getClass().getDeclaredField("slidingTabIndicator");
                //API28以下为mTabStrip
//              Field tabIndicator = tabLayout.getClass().getDeclaredField("mTabStrip");
                tabIndicator.setAccessible(true);
                LinearLayout mTabStrip = (LinearLayout) tabIndicator.get(tabLayout);
                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("textView");
                    //API28以下为mTextView
//                  Field mTextViewField = tabView.getClass().getDeclaredField("mTextView");
                    mTextViewField.setAccessible(true);
                    TextView mTextView = (TextView) mTextViewField.get(tabView);
                    tabView.setPadding(0, 0, 0, 0);

                    //字多宽线就多宽，需要测量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 这个间距可根据自己需求更改
                    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();
            }
        });

    }