谷歌搜索了三天。我无法自拔。我有抽屉导航和 fragment ,除了 fragment 中的选项卡之外,一切都很完美。这是 MainActiviti 类的一部分...
case R.id.linearLayoutHome:
fragment = new HomeFragment();
break; //this one works well
case R.id.linearLayoutHome:
fragment = new CategoryFragment(); //error showing here
break; //this one doesn't work
调用 fragment ...
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.container, fragment).commit();
完美运行的主页 fragment :
public class HomeFragment extends Fragment {
public HomeFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_home, container, false);
return rootView;
}
}
CategoryFragment 不起作用。我认为这是因为 fragment 中的 fragment :
public class CategoriesActivity extends Fragment {
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
public CategoriesActivity(){
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_home, container, false);
mSectionsPagerAdapter = new SectionsPagerAdapter(getChildFragmentManager());
mViewPager = (ViewPager) rootView.findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
return rootView;
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
Fragment fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
fragment.setArguments(args);
return fragment;
}
@Override
public int getCount() {
return 2;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title1).toUpperCase(l);
case 1:
return getString(R.string.title2).toUpperCase(l);
}
return null;
}
}
public static class DummySectionFragment extends Fragment {
public static final String ARG_SECTION_NUMBER = "section_number";
public DummySectionFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_tabbed_dummy, container, false);
TextView dummyTextView = (TextView) rootView.findViewById(R.id.section_label);
dummyTextView.setText(Integer.toString(getArguments().getInt(ARG_SECTION_NUMBER)));
return rootView;
}
}
}
我需要一些解决方案。没有更多的想法了。
最佳答案
第 1 步:
您的 onCreateView()
应该如下所示:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_home, container, false);
return rootView;
}
并将此方法添加到您的Fragment
中:
@Override
public void onViewCreated(View view, Bundle savedInstanceState){
mSectionsPagerAdapter = new SectionsPagerAdapter(getChildFragmentManager());
mViewPager = (ViewPager) view.findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
}
第 2 步:
确保您的 Activity
扩展自 FragmentActivity
或 ActionBarActivity
。
第 3 步:
确保您使用的是 android.support.v4.app.Fragment
而不是 android.app.Fragment
关于java - 带选项卡的抽屉式导航,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28682968/