CODEWITHSUNDEEP
android
user1324936
user1324936

Reputation: 2187

Android: using savedInstanceState with Fragment error

my code:

Main Activity

protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

..
mAdapter = new MyAdapter(getFragmentManager());
            mPager = (ViewPager) findViewById(R.id.pager);
            mPager.setAdapter(mAdapter);
            mPager.setOnPageChangeListener(new MyPageChangeListener());


private class MyPageChangeListener extends
            ViewPager.SimpleOnPageChangeListener {
        @Override
        public void onPageSelected(int position) {
            focusedPage = position;
        }
    }

public class MyAdapter extends FragmentStatePagerAdapter {
    public MyAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public int getCount() {
        return qNumberSum;
    }

    @Override
    public Fragment getItem(int position) {
        ArrayListFragment alf = new ArrayListFragment();
        return alf.newInstance(position);
    }

    @Override
    public void setPrimaryItem(ViewGroup container, int position,
            Object object) {
        ArrayListFragment alf = (ArrayListFragment) object;
        mCurrentView = alf.getView();

    }

}

public class ArrayListFragment extends Fragment {
    int mNum;


    /**
     * Create a new instance of CountingFragment, providing "num" as an
     * argument.
     */
    ArrayListFragment newInstance(int num) {
        ArrayListFragment f = new ArrayListFragment();

        // Supply num input as an argument.
        Bundle args = new Bundle();
        args.putInt("num", num);
        f.setArguments(args);

        return f;
    }

    /**
     * When creating, retrieve this instance's number from its arguments.
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mNum = getArguments() != null ? getArguments().getInt("num") : 1;
    }

When savedInstanceState is null (for example when the user starts over) everything works ok. But when not null i get this exception:

04-29 14:10:00.398: E/AndroidRuntime(29348): Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.Android.Prj.DispKl$ArrayListFragment: make sure class name exists, is public, and has an empty constructor that is public

Why is it so and how can I fix it?

Upvotes: 2

Views: 637

Answers (1)

CommonsWare
CommonsWare

Reputation: 1006594

If ArrayListFragment is an inner class of com.Android.Prj.DispKl, it needs to be static. Or, move it into its own separate public Java class.

BTW, please do not put code in the com.Android package. Use your own domain name, please.

Upvotes: 2

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