Question

当我移动到另一个标签时，每次创建新标签。我从服务器获取tabname和catid，

 private void setTabTitle() {
   Final TabLayout  tabLayout = (TabLayout) findViewById(R.id.tabs);
    tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);

mviewPager.setAdapter(new ViewPagerAdapter(getSupportFragmentManager()));
 viewPager.setOffscreenPageLimit(jSonTab.size());
    tabLayout.post(new Runnable() {
        @Override
        public void run() {
            tabLayout.setupWithViewPager(mviewPager);

            tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
                @Override
                public void onTabSelected(TabLayout.Tab tab) {
                    mviewPager.setCurrentItem(tab.getPosition());      // Get current clicked Tab Position


                }

                @Override
                public void onTabUnselected(TabLayout.Tab tab) {
                }

                @Override
                public void onTabReselected(TabLayout.Tab tab) {
                }
            });
        }
    });
}
public Parcelable saveState() {
    return null;
}
class ViewPagerAdapter extends FragmentStatePagerAdapter {

    public ViewPagerAdapter(FragmentManager manager) {
        super(manager);
    }

    @Override
    public Fragment getItem(int position) {

  return MainFragment.newInstance(CatId.get(position), tabName.get(position));

 }

    @Override
    public int getCount() {
        return tabName.size();
    }

    @Override
    public CharSequence getPageTitle(int position) {

        return tabName.get(position);
    }
}

当我在第一个标签中更改任何内容，然后转到另一个标签时，第一个标签会刷新并创建新实例，每次调用服务器来获取特定选项卡的详细信息

Answer 1

尝试设置viewPager.setOfscreenPagelimit（noOfPagesInViewPager）;

类ViewPagerAdapter扩展FragmentStatePagerAdapter { Mainfragment mainfragment;

public ViewPagerAdapter(FragmentManager manager) {
    super(manager);
    mainfragment=new Mainfragment();
}

@Override
public Fragment getItem(int position) {

     return mainfragment(CatId.get(position), tabName.get(position));

}

@Override
public int getCount() {
    return tabName.size();
}

@Override
public CharSequence getPageTitle(int position) {

    return tabName.get(position);
}

}

如何在android中保存视图寻呼机片段实例

1 个答案: