我正在使用 viewpager
和 Tablayout
开发一个 android 应用程序。这是我从父 Activity 打开的 View 寻呼机 fragment
public class HomeFragment extends Fragment{
private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;
public HomeActivity() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_home, container, false);
mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager());
mViewPager = (ViewPager) rootView.findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) rootView.findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
return rootView;
}
}
这是我的 viewpager 适配器
public class SectionsPagerAdapter extends FragmentStatePagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
switch (position){
case 0 : return new Settingsfragment();
case 1 : return new Profilefragment();
case 2 : return new Categoriesfragment();
}
return null;
}
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "settings";
case 1:
return "profile";
case 2:
return "Category";
}
return null;
}
}
当我用下面的代码打开 fragment 并按回 viewpager
变成空的
public class Profilefragment extends Fragment {
public Profilefragment(){}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.profile_layout, container, false);
TextView VE = (TextView) rootView.findViewById(R.id.profile_view_enquiry);
VE.setOnClickListener(new View.OnClickListener(){
public void onClick (View view){
Fragment fragment = null;
fragment = new Enquiryfragment();
replaceFragment(fragment);
}
});
TextView CA = (TextView) rootView.findViewById(R.id.profile_change_address);
CA.setOnClickListener(new View.OnClickListener(){
public void onClick (View view){
Fragment fragment = null;
fragment = new ChangeAddressfragment();
replaceFragment(fragment);
}
});
return rootView;
}
public void replaceFragment(Fragment someFragment) {
android.support.v4.app.FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.replace(R.id.containerView, someFragment);
transaction.addToBackStack(null);
transaction.commit();
}}
我该如何解决这个问题。请帮忙。
最佳答案
public class HomeFragment extends Fragment{
private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;
public HomeFragment() {}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_home, container, false);
mSectionsPagerAdapter = new SectionsPagerAdapter(getChildFragmentManager());//Changed here
mViewPager = (ViewPager) rootView.findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) rootView.findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
return rootView;
}
}
您应该在 Fragment
中使用 getChildFragmentManager()
而不是 getFragmentManager()
关于android - 来自 fragment 的 viewpager 返回空白,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42671729/