텍스트 길이에 따라 TabLayout 표시줄 너비 변경

import android.support.design.widget.TabLayout;
import android.view.View;
import android.widget.LinearLayout;
import com.zfdt.crm.MyApplication;
import java.lang.reflect.Field;

/**
 * @description   TabLayout               
 * @auther xuzijian
 * @date 2017/8/1 9:12.
 */

public class TabUtils {
    /**
     * @description         
     * @param tabs      tabLayout
     * @param textCount        
     * @param textSize      sp
     */
    public static void setIndicator(TabLayout tabs, int textCount,int textSize) {
        Class> tabLayout = tabs.getClass();
        Field tabStrip = null;
        try {
            tabStrip = tabLayout.getDeclaredField("mTabStrip");
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        }
        tabStrip.setAccessible(true);
        LinearLayout ll_tab = null;
        try {
            ll_tab = (LinearLayout) tabStrip.get(tabs);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
        if (ll_tab != null) {
            for (int i = 0; i < ll_tab.getChildCount(); i++) {
                View child = ll_tab.getChildAt(i);
                child.setPadding(0, 0, 0, 0);
                int width = child.getMeasuredWidth();
                int contentWidth = textCount*sp2px(textSize);
                int margin = (width - contentWidth)>>1;
                LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.MATCH_PARENT, 1);
                params.leftMargin = margin;
                params.rightMargin = margin;
                child.setLayoutParams(params);
                child.invalidate();
            }
        }
    }

    public static int sp2px(float spValue) {
        final float fontScale = MyApplication.getInstance().getResources().getDisplayMetrics().scaledDensity;
        return (int) (spValue * fontScale + 0.5f);
    }
}

  @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        TabUtils.setIndicator(mBinding.tab,5,14);
    }