FragmentPagerAdapter-java.lang.IllegalStateException: Fragment already added

[liuzc]

Hi Jeremy Feinstein, I am trying to use your JazzyViewPager with a FragmentPagerAdapter,but it occur a
java.lang.IllegalStateException: Fragment already added: HomeFragment{40f97560 #0 id=0x7f040012 android:switcher:2130968594:0}

here is my code:

final class FMPagerAdapter extends FragmentPagerAdapter {

    private List<Fragment> fragments;

    public FMPagerAdapter(FragmentManager fm, List<Fragment> fragments) {
        super(fm);
        this.fragments = fragments;
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        if(object != null){
            return ((Fragment)object).getView() == view;
        }else{
            return false;
        }
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        Object obj = super.instantiateItem(container, position);
        viewPager.setObjectForPosition(obj, position);
        return super.instantiateItem(container, position);
    }


    @Override
    public Fragment getItem(int arg0) {
        // TODO Auto-generated method stub
        return fragments.get(arg0);
    }


    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return this.fragments.size();
    }

}

and if i don't overwrite instantiateItem method ,it works well ,but have no TransitionEffect..

[liuzc]

I am so sorry, It's my careless...

in instantiateItem must return obj.

@OverRide
public Object instantiateItem(ViewGroup container, int position) {
Object obj = super.instantiateItem(container, position);
viewPager.setObjectForPosition(obj, position);
// return super.instantiateItem(container, position);
return obj;
}

[supsabhi]

Hi,
i am having same issue,my pageadapter class is

public class MyPagerAdapter extends FragmentPagerAdapter {

private List<Fragment> fragments;
private JazzyViewPager mJazzy;

public MyPagerAdapter(FragmentManager fm) {
    super(fm);
    this.fragments = new ArrayList<Fragment>();
    fragments.add(new Fragmentone());
    fragments.add(new Fragmenttwo());
    fragments.add(new Fragmentthree());
}

@Override
public Fragment getItem(int position) {
    return fragments.get(position);
}

@Override
public int getCount() {
    return fragments.size();
}
public Object instantiateItem(ViewGroup container, final int position) {
    Object obj = super.instantiateItem(container, position);
    mJazzy.setObjectForPosition(obj, position);
    return obj;
    }
@Override
public boolean isViewFromObject(View view, Object object) {
    if(object != null){
        return ((Fragment)object).getView() == view;
    }else{
        return false;
    }
}

}

and i am calling it as:

vpage = (JazzyViewPager) findViewById(R.id.jazzy_pager);
vpage.setTransitionEffect(effect);
MyPagerAdapter pageAdapter = new MyPagerAdapter(getSupportFragmentManager());
vpage.setAdapter(pageAdapter);

But i am getting following error: can u please please help me...

10-16 22:02:56.571: E/AndroidRuntime(29181): FATAL EXCEPTION: main
10-16 22:02:56.571: E/AndroidRuntime(29181): java.lang.NullPointerException
10-16 22:02:56.571: E/AndroidRuntime(29181): at pl.looksok.viewpagerdemo.MyPagerAdapter.instantiateItem(MyPagerAdapter.java:38)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:832)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.support.v4.view.ViewPager.populate(ViewPager.java:982)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.support.v4.view.ViewPager.populate(ViewPager.java:914)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.view.View.measure(View.java:12911)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4805)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1399)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1033)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.widget.LinearLayout.onMeasure(LinearLayout.java:559)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.view.View.measure(View.java:12911)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4805)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.widget.FrameLayout.onMeasure(FrameLayout.java:297)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.view.View.measure(View.java:12911)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.widget.LinearLayout.measureVertical(LinearLayout.java:828)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.widget.LinearLayout.onMeasure(LinearLayout.java:557)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.view.View.measure(View.java:12911)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4805)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.widget.FrameLayout.onMeasure(FrameLayout.java:297)
10-16 22:02:56.571: E/AndroidRuntime(29181): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2097)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.view.View.measure(View.java:12911)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1064)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2446)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.os.Handler.dispatchMessage(Handler.java:99)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.os.Looper.loop(Looper.java:137)
10-16 22:02:56.571: E/AndroidRuntime(29181): at android.app.ActivityThread.main(ActivityThread.java:4448)
10-16 22:02:56.571: E/AndroidRuntime(29181): at java.lang.reflect.Method.invokeNative(Native Method)
10-16 22:02:56.571: E/AndroidRuntime(29181): at java.lang.reflect.Method.invoke(Method.java:511)
10-16 22:02:56.571: E/AndroidRuntime(29181): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
10-16 22:02:56.571: E/AndroidRuntime(29181): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
10-16 22:02:56.571: E/AndroidRuntime(29181): at dalvik.system.NativeStart.main(Native Method)

[saifudin]

Try change FragmentPagerAdapter
with
FragmentStatePagerAdapter

source
#46

[StephenGiant]

FragmentStatePageradapter
it didn't work