Android 片段中带有选项卡的ViewPager仅在第一个视图中加载选项卡
我有一个带有标签的片段,它利用了一个视图寻呼机。问题是,当我第一次访问片段时,选项卡会出现,但如果我导航到其他地方,然后返回到该片段,则视图页面中的片段将不再出现 我使用SectionsPagerAdapter,如下所示:Android 片段中带有选项卡的ViewPager仅在第一个视图中加载选项卡,android,android-layout,android-fragments,android-viewpager,android-tablayout,Android,Android Layout,Android Fragments,Android Viewpager,Android Tablayout,我有一个带有标签的片段,它利用了一个视图寻呼机。问题是,当我第一次访问片段时,选项卡会出现,但如果我导航到其他地方,然后返回到该片段,则视图页面中的片段将不再出现 我使用SectionsPagerAdapter,如下所示: public class SectionsPagerAdapter extends FragmentPagerAdapter { public SectionsPagerAdapter(FragmentManager fm) { super(fm); } @Ove
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
switch (position) {
case 0:
//ClientHealthRootFragment tab1 = new ClientHealthRootFragment();
ChatListFragment tab1 = new ChatListFragment();
return tab1;
case 1:
ClientProfileFragment tab2 = new ClientProfileFragment();
//ChatListFragment tab2 = new ChatListFragment();
return tab2;
case 2:
//ClientCommentRootFragment tab3 = new ClientCommentRootFragment();
ChatListFragment tab3 = new ChatListFragment();
return tab3;
default:
return null;
}
}
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "Health";
case 1:
return "Profile";
case 2:
return "Comments";
}
return null;
}}
然后在我处理这些部分的片段中有如下内容:
public class ClientMainFragment extends Fragment {
private ViewPager mViewPager;
SectionsPagerAdapter mSectionsPagerAdapter;
String client_name;
int client_image;
private TextView clientNameText;
private ImageView clientImage;
public ClientMainFragment() {
//empty constructor
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_client_main, container, false);
clientNameText = view.findViewById(R.id.clientNameTxt);
clientImage = view.findViewById(R.id.clientImage);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) view.findViewById(R.id.viewPager);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) view.findViewById(R.id.tab_layout);
tabLayout.setupWithViewPager(mViewPager);
return view;
}}
我不确定我错过了什么,任何帮助都将不胜感激
编辑:解决方案
我找到了以下链接的问题所在:
韩德尔碎片生命周期实施以下ovverride方法:
@Override
public void onResume() {
super.onResume();
}
并在onReume方法中将viewpager代码的孔代码如下所示:
mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) view.findViewById(R.id.viewPager);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) view.findViewById(R.id.tab_layout);
tabLayout.setupWithViewPager(mViewPager);
@Override
public void onResume() {
super.onResume();
mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) view.findViewById(R.id.viewPager);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) view.findViewById(R.id.tab_layout);
tabLayout.setupWithViewPager(mViewPager);
}
因此最终代码为:
mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) view.findViewById(R.id.viewPager);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) view.findViewById(R.id.tab_layout);
tabLayout.setupWithViewPager(mViewPager);
@Override
public void onResume() {
super.onResume();
mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) view.findViewById(R.id.viewPager);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) view.findViewById(R.id.tab_layout);
tabLayout.setupWithViewPager(mViewPager);
}
添加您的
fragment\u client\u main
code谢谢您的回答,但不幸的是,在我第一次打开它后返回它时,它仍然没有显示出来。