Wie aktualisiert Tabs Inhalt dynamisch beim Wechseln zwischen einer Registerkarte zu anderen in Fragment?

Question

Ich habe Aktivität namens CourseActivity.java, in dem ich 2 Registerkarten nach Namen UserCourses und FavouriteCourses.Ich habe eine Liste von Kursen in der ersten Registerkarte.Und es haben Symbol, auf der Auswahl von Symbol die jeweilige grobe wird hinzugefügt werdenFavouritecourse Liste. Aber mein Problem ist, wenn ich zum Lieblingskurs-Tab gehe, wird der Inhalt nicht aktualisiert, bis ich ihn aktualisiere oder ich mich abmelde und mich wieder an der App anmelde. Hier

ist CoarseActivity.java.This Kursart zu CourseFragment.java

//display content of tabs on touch of tabs 
class CourseTabsAdapter extends FragmentStatePagerAdapter { 


    public CourseTabsAdapter(FragmentManager fm) 
    { 
     super(fm); 
    } 

    @Override 
    public Fragment getItem(int position) { 
     /* 
     * We use bundle to pass course listing type because, by using other 
     * methods we will lose the listing type information in the fragment 
     * on onResume (this calls empty constructor). For the same reason 
     * interface may not work. Bundles are passed again on onResume 
     */ 
     switch (position) { 
     case 0: 

      /*LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(CourseActivity.this); 
      Intent i = new Intent("TAG_REFRESH"); 
      lbm.sendBroadcast(i);*/ 

      CourseFragment userCourses = new CourseFragment(); 

      // Set the listing type to only user courses in bundle. 
      Bundle bundle = new Bundle(); 
      bundle.putInt("coursesType", CourseFragment.TYPE_USER_COURSES); 
      userCourses.setArguments(bundle); 

      return userCourses; 
     case 1: 
      CourseFragment favCourses = new CourseFragment(); 

      /*favCourses.onRefresh();*/ 

      /*new courseSyncerBg().execute("");*/ 
      // Set the listing type to only user courses in bundle. 
      Bundle bundle1 = new Bundle(); 
      bundle1.putInt("coursesType", CourseFragment.TYPE_FAV_COURSES); 
      favCourses.setArguments(bundle1); 

      return favCourses; 
     } 
     return null; 
    } 

Und das ist mein CourseFragment.java

public class CourseFragment extends Fragment implements OnRefreshListener { 
/** 
* List all courses in Moodle site 
*/ 
public static final int TYPE_ALL_COURSES = 0; 
/** 
* List only user courses 
*/ 
public static final int TYPE_USER_COURSES = 1; 
/** 
* List only courses favourited by user 
*/ 
public static final int TYPE_FAV_COURSES = 2; 

CourseListAdapter courseListAdapter; 
SessionSetting session; 
List<MoodleCourse> mCourses; 
int Type = 0; 
LinearLayout courseEmptyLayout; 
SwipeRefreshLayout swipeLayout; 

/** 
* Pass the course listing type as a bundle param of type int with name 
* coursesType 
*/ 
public CourseFragment() { 
} 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    if (this.getArguments() != null) 
     Type = this.getArguments().getInt("coursesType", TYPE_USER_COURSES); 
} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 

    View rootView = inflater.inflate(R.layout.frag_courses, container, 
      false); 

    // Get all courses of this site 
    session = new SessionSetting(getActivity()); 

    if (Type == TYPE_USER_COURSES) 
     mCourses = MoodleCourse.find(MoodleCourse.class, 
       "siteid = ? and is_user_course = ?", 
       session.getCurrentSiteId() + "", "1"); 
    else if (Type == TYPE_FAV_COURSES) 
     mCourses = MoodleCourse.find(MoodleCourse.class, 
       "siteid = ? and is_fav_course = ?", 
       session.getCurrentSiteId() + "", "1"); 
    else 
     mCourses = MoodleCourse.find(MoodleCourse.class, "siteid = ?", 
       session.getCurrentSiteId() + ""); 

    courseEmptyLayout = (LinearLayout) rootView 
      .findViewById(R.id.course_empty_layout); 
    ListView courseList = (ListView) rootView 
      .findViewById(R.id.content_course); 
    courseListAdapter = new CourseListAdapter(getActivity()); 
    courseList.setAdapter(courseListAdapter); 

    swipeLayout = (SwipeRefreshLayout) rootView 
      .findViewById(R.id.swipe_refresh); 
    Workaround.linkSwipeRefreshAndListView(swipeLayout, courseList); 
    swipeLayout.setOnRefreshListener(this); 

    // We don't want to run sync in each course listing 
    if (Type == TYPE_USER_COURSES) 
     new courseSyncerBg().execute(""); 

    return rootView; 
} 

public class CourseListAdapter extends BaseAdapter { 
    private final Context context; 

    public CourseListAdapter(Context context) { 
     this.context = context; 
     if (!mCourses.isEmpty()) 
      courseEmptyLayout.setVisibility(LinearLayout.GONE); 
    } 

    @Override 
    public View getView(final int position, View convertView, 
      ViewGroup parent) { 
     final ViewHolder viewHolder; 

     if (convertView == null) { 
      viewHolder = new ViewHolder(); 
      LayoutInflater inflater = (LayoutInflater) context 
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 

      convertView = inflater.inflate(R.layout.list_item_course, 
        parent, false); 

      viewHolder.shortname = (TextView) convertView 
        .findViewById(R.id.list_course_shortname); 
      viewHolder.fullname = (TextView) convertView 
        .findViewById(R.id.list_course_fullname); 
      viewHolder.favIcon = (ImageView) convertView 
        .findViewById(R.id.list_course_fav); 

      // Save the holder with the view 
      convertView.setTag(viewHolder); 
     } else { 
      // Just use the viewHolder and avoid findviewbyid() 
      viewHolder = (ViewHolder) convertView.getTag(); 
     } 

     // Assign values 
     final MoodleCourse mCourse = mCourses.get(position); 
     viewHolder.shortname.setText(mCourse.getShortname()); 
     viewHolder.fullname.setText(mCourse.getFullname()); 
     if (mCourses.get(position).getIsFavCourse()) 
      viewHolder.favIcon.setImageResource(R.drawable.icon_favorite); 
     else 
      viewHolder.favIcon 
        .setImageResource(R.drawable.icon_favorite_outline); 

     convertView.setOnClickListener(new OnClickListener() { 
      @Override 
      public void onClick(View arg0) { 
       Intent i = new Intent(context, CourseContentActivity.class); 
       i.putExtra("courseid", mCourses.get(position).getCourseid()); 
       context.startActivity(i); 
      } 
     }); 

     viewHolder.favIcon.setOnClickListener(new OnClickListener() { 
      @Override 
      public void onClick(View arg0) { 

       // Simply unfav if that's the case 
       if (mCourse.getIsFavCourse()) { 
        mCourse.setIsFavCourse(!mCourse.getIsFavCourse()); 
        mCourse.save(); 

        // Update listview 
        mCourses.get(position).setIsFavCourse(
          mCourse.getIsFavCourse()); 
        courseListAdapter.notifyDataSetChanged(); 

        // Update listview 
        mCourses.get(position).setIsFavCourse(
          mCourse.getIsFavCourse()); 
        courseListAdapter.notifyDataSetChanged(); 

        return; 
       } 

       // If fav'ing, ask for confirmation. We will be doing a sync 
       AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
         context); 
       alertDialogBuilder 
         .setMessage("This will make course contents offline and sends notifications for new contents if enabled"); 
       alertDialogBuilder.setTitle("Add " 
         + mCourses.get(position).getShortname() 
         + " to favourites?"); 
       alertDialogBuilder.setPositiveButton("Yes", 
         new DialogInterface.OnClickListener() { 

          @Override 
          public void onClick(DialogInterface arg0, 
            int arg1) { 
           mCourse.setIsFavCourse(!mCourse 
             .getIsFavCourse()); 
           mCourse.save(); 

           // Update listview 
           mCourses.get(position).setIsFavCourse(
             mCourse.getIsFavCourse()); 
           courseListAdapter.notifyDataSetChanged(); 

           // Start sync service for course 
           Intent i = new Intent(context, 
             MDroidService.class); 
           i.putExtra("notifications", false); 
           i.putExtra("siteid", 
             session.getCurrentSiteId()); 
           i.putExtra("courseid", 
             mCourse.getCourseid()); 
           context.startService(i); 

          } 
         }); 
       alertDialogBuilder.setNegativeButton("No", 
         new DialogInterface.OnClickListener() { 

          @Override 
          public void onClick(DialogInterface dialog, 
            int which) { 

          } 
         }); 

       AlertDialog alertDialog = alertDialogBuilder.create(); 
       alertDialog.show(); 
      } 
     }); 

     return convertView; 
    } 

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

    @Override 
    public Object getItem(int position) { 
     return mCourses.get(position); 
    } 

    @Override 
    public long getItemId(int position) { 
     return position; 
    } 
} 

static class ViewHolder { 
    TextView shortname; 
    TextView fullname; 
    ImageView favIcon; 
} 

/** 
* Syncs the courses of the current user in background and updates list * 
* 
* @author Praveen Kumar Pendyala (praveen@praveenkumar.co.in) 
* 
*/ 
private class courseSyncerBg extends AsyncTask<String, Integer, Boolean> { 

    @Override 
    protected void onPreExecute() { 
     swipeLayout.setRefreshing(true); 
    } 

    @Override 
    protected Boolean doInBackground(String... params) { 
     CourseSyncTask cs = new CourseSyncTask(session.getmUrl(), 
       session.getToken(), session.getCurrentSiteId()); 
     return cs.syncUserCourses(); 
    } 

    @Override 
    protected void onPostExecute(Boolean result) { 
     if (Type == TYPE_USER_COURSES) 
      mCourses = MoodleCourse.find(MoodleCourse.class, 
        "siteid = ? and is_user_course = ?", 
        session.getCurrentSiteId() + "", "1"); 
     else if (Type == TYPE_FAV_COURSES) 
      mCourses = MoodleCourse.find(MoodleCourse.class, 
        "siteid = ? and is_fav_course = ?", 
        session.getCurrentSiteId() + "", "1"); 
     else 
      mCourses = MoodleCourse.find(MoodleCourse.class, 
        "siteid = ? and ", session.getCurrentSiteId() + ""); 
     courseListAdapter.notifyDataSetChanged(); 
     if (!mCourses.isEmpty()) 
      courseEmptyLayout.setVisibility(LinearLayout.GONE); 
     swipeLayout.setRefreshing(false); 
    } 
} 

@Override 
public void onRefresh() { 
    new courseSyncerBg().execute(""); 
} 

}

Bitte helfen Sie mir schicken zu sortout Problem.Ich habe bereits unter eins referiert. Aber ich konnte keine Antwort auf mein Problem bekommen.

http://stackoverflow.com/questions/10849552/update-viewpager-dynamically/17855730#17855730

Answer 1

Sie setUserVisibleHint Methode in Ihrem Fragmente außer Kraft setzen sollten und Ihren erfrischenden Code setzen in ihm

@Override 
    public void setUserVisibleHint(boolean isVisibleToUser) { 
    super.setUserVisibleHint(isVisibleToUser); 
     if (isVisibleToUser && isResumed()) { 

     } 
    }