TabLayout与ViewPager连用

1:基本设置

val tabTitles =arrayOf("最近七天收益","下属会员充值","历史收益")  //TabLayout的三个item

val list: MutableList = ArrayList()     //放置子view的集合

val incomeFragment = IncomeFragment()  //子view1

val myMemberRechargeFragment = MyMemberRechargeFragment()  //子view2

val incomeHistoryFragment = IncomeHistoryFragment()  //子view3

list.add(incomeFragment)   //添加子view1

list.add(myMemberRechargeFragment)  //添加子view2

list.add(incomeHistoryFragment)  //添加子view3

val adapter = MyViewPageAdapter(supportFragmentManager, list, tabTitles)  //设置adapter

content.setAdapter(adapter)   //设置adapter，content为ViewPager的id

tab.setupWithViewPager(content)  //设置Tab Layout与ViewPager联动

tab.setTabMode(TabLayout.MODE_FIXED)  //设置模式

2:adapter（MyViewPageAdapter）

public class MyViewPageAdapterextends FragmentPagerAdapter {

private List list;

private String tabTitles[];

public MyViewPageAdapter(FragmentManager fm, List list,String tabTitles[]) {

super(fm);

this.list = list;

this.tabTitles = tabTitles;

}

@Override

    public Fragment getItem(int i) {

return list.get(i);

}

@Override

    public int getCount() {

return list.size();

}

@Override

    public CharSequence getPageTitle(int position) {

return tabTitles[position];

}

@Override

    public void destroyItem(ViewGroup container,int position, Object object) {

//super.destroyItem(container, position, object); 避免多出销毁Fragment

    }

}

3:设置TabLayout默认选中

content.setCurrentItem(type)   //content为ViewPager的id，type为需要选中的item

tab.getTabAt(type)!!.select()    //tab为TabLayout的id，type同上。