I am working with fragments and pageview
trying to use a horizontal pager and i got the following error:
Cannot instantiate the type PagerAdapter.
I know that PagerAdapter
is an abstract class, so i created a new class that inherits from PagerAdapter
and used that instead.
But didn't fix it.
that's my code:
main activity import
import java.util.List;
import java.util.Vector;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
//import com.example.prova.PagerAdapter;
//import android.support.v4.view.PagerAdapter;
Main Activity where i have the error when i try to create a pageradapter
public class MainActivity extends ActionBarActivity {
List<Fragment> fragments = new Vector<Fragment>();
private ViewPager mPager;
PagerAdapter mPagerAdapter;
//mPager.setCurrentItem(2);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// creating fragments and adding to list
fragments.add(Fragment.instantiate(this,Timeline.class.getName()));
fragments.add(Fragment.instantiate(this,Postit.class.getName()));
fragments.add(Fragment.instantiate(this,Frase.class.getName()));
fragments.add(Fragment.instantiate(this,Impostazioni.class.getName()));
// creating adapter and linking to view pager
this.mPagerAdapter=new PagerAdapter(super.getSupportFragmentManager(),fragments); //I GOT HERE THE ERROR
mPager = (ViewPager) super.findViewById(R.id.pager);
mPager.setAdapter(this.mPagerAdapter);
}
And here my PagerAdapter
public abstract class PagerAdapter extends FragmentPagerAdapter {
// fragments to instantiate in the viewpager
private List<Fragment> fragments;
// constructor
public PagerAdapter(FragmentManager fm,List<Fragment> fragments) {
super(fm);
this.fragments = fragments;
}
// return access to fragment from position, required override
@Override
public Fragment getItem(int position) {
return this.fragments.get(position);
}
// number of fragments in list, required override
@Override
public int getCount() {
return this.fragments.size();
}
}
You cannot create an instance of an abstract class.