我的应用程序中有一个滑块菜单,当我点击菜单中的一个项目时,它会显示相应的片段。那个碎片有一个tablayout和一个viewpager。 Fragment xml在下面给出
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:background="@color/colorPrimary"
app:tabSelectedTextColor="@color/textColorPrimary"
app:tabTextColor="@color/colorAccent"
android:layout_height="wrap_content"
app:tabMode="fixed"
app:tabGravity="fill"/>
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_below="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
下面给出了滑块菜单上点击的片段的代码片段
public class MyCoursesFragment extends Fragment {
private TabLayout tabLayout;
private ViewPager viewPager;
public MyCoursesFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getFragmentManager());
adapter.addFragment(new ScheduledFragment(), "SCHEDULED");
adapter.addFragment(new LiveStreamingFragment(), "LIVE STREAMING");
adapter.addFragment(new UpcomingFragment(), "UPCOMING");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getCount() {
return mFragmentList.size();
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Log.d("mlearning", "inside my course");
View rootView = inflater.inflate(R.layout.fragement_courses, container, false);
viewPager = (ViewPager) rootView.findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) rootView.findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
return rootView;
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
}
@Override
public void onDetach() {
super.onDetach();
}
}
上面的片段中有三个标签。每个片段的xml包含一个列表视图,下面给出了xml。
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/lvList"
android:paddingLeft="10dp"
android:paddingTop="10dp"
android:backgroundTint="#888686" />
tablayout片段的代码如下:
public class ScheduledFragment extends Fragment {
public ScheduledFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Log.d("mlearning", "inside scheduled");
View rootView = inflater.inflate(R.layout.fragment_scheduled, container, false);
ArrayList<CoursePojo> searchResults = GetSearchResults();
final ListView lv1 = (ListView) rootView.findViewById(R.id.lvList2);
lv1.setAdapter(new MyCustomCourseList(getActivity(), searchResults));
lv1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> a, View v, int position, long id) {
Object o = lv1.getItemAtPosition(position);
CoursePojo fullObject = (CoursePojo) o;
//Toast.makeText(getBaseContext(), "You have chosen: " + " " + fullObject.getId(), Toast.LENGTH_LONG).show();
}
});
return rootView;
}
private ArrayList<CoursePojo> GetSearchResults(){
ArrayList<CoursePojo> results = new ArrayList<CoursePojo>();CoursePojo coursePojo3=new CoursePojo();
coursePojo3.setName("Android");
coursePojo3.setDesc("First os was released without a phone ");
coursePojo3.setStartdate("20 Mar");
coursePojo3.setEndDate("8 Apr");
coursePojo3.setProgress("40");
results.add(coursePojo3);
// Inflate the layout for this fragment
return results;
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
}
@Override
public void onDetach() {
super.onDetach();
}}
最初,当我单击菜单片段时,选项卡片段中的值就像代码中提到的那样。但是,如果我再次点击菜单滑块,则不显示选项卡布局中的项目。还有一些选项卡为空或某些选项卡具有一些值。我哪里错了?
答案 0 :(得分:2)
使用FragmentPagerAdapter的FragmentStatePagerAdapter。
答案 1 :(得分:0)
尝试在onResume()
中的List中填充数据