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Android

Posted by Lend Kazazi
Lend Kazazi
223 Points

why is eclipse showing a type mismatch

/**

  • A {@link FragmentPagerAdapter} that returns a fragment corresponding to

  • one of the sections/tabs/pages. */ public class SectionsPagerAdapter extends FragmentPagerAdapter {

    protected Context mContext;

    public SectionsPagerAdapter(Context context, FragmentManager fm) { super(fm); mContext = context; } @Override public Fragment getItem(int position){ //getItem is called to instantiate the fragment for the given page. //Return a DummySectionFragment (defined as a static inner class //below)with the page number and its lone argument.

    switch(position) {
case 0:
    return new ChatFragment();
case 1: 
    return new InboxFragment();
case 2:
    return new FriendsFragment();
case 3:
    return new DailyFragment();

}

return null;

    }

    @Override public int getCount() { // Show 4 total pages. return 4; }

    @Override public CharSequence getPageTitle(int position) { Locale l = Locale.getDefault(); switch (position) { case 0: return mContext.getString(R.string.title_section1).toUpperCase(l); case 1: return mContext.getString(R.string.title_section2).toUpperCase(l); case 2: return mContext.getString(R.string.title_section3).toUpperCase(l); case 3: return mContext.getString(R.string.title_section4).toUpperCase(l); } return null; } }

This is what the error is showing: Type mismatch: cannot convert from ChatFragment to a Fragment Type mismatch: cannot convert from FriendsFragment to a Fragment Type mismatch: cannot convert from DailyFragment to a Fragment Type mismatch: cannot convert from InboxFragment to a Fragment

2 Answers

Lend Kazazi
Lend Kazazi
223 Points
Lend Kazazi
Lend Kazazi
223 Points

what do you mean by that a did SectionsPagerAdapter extends Fragment

Stone Preston
Stone Preston
42,016 Points
Stone Preston
Stone Preston
42,016 Points

your method here is returning an object of type Fragment

public Fragment getItem(int position){
    //getItem is called to instantiate the fragment for the given page.
    //Return a DummySectionFragment (defined as a static inner class
    //below)with the page number and its lone argument.

    switch(position) {
    case 0:
        return new ChatFragment();
    case 1: 
        return new InboxFragment();
    case 2:
        return new FriendsFragment();
    case 3:
        return new DailyFragment();

    }

    return null;

}

your switch statement returns instances of ChatFragment, InboxFragment, FriendsFragment, DailyFragment. In order for the return type of the method to match the type of the object it returns, your custom classes that you return need to inherit from Fragment (so they need to have extends Fragment in their class headings)

the errors you are getting such as cannot convert from DailyFragment to a Fragment suggest you may not have subclassed Fragment in those classes.

Stone Preston
Stone Preston
42,016 Points
Stone Preston
Stone Preston
42,016 Points

do ChatFragment and FriendFragment extend Fragment?