Can't Add A Fragment When Creating A New Activity

i'm trying to create a wizard Like Android application, i want to Create an activity and Two dynamic Fragments, the first one will be added when the Activity is created, and the s

Solution 1:

Follow these steps:

1. Create your main (activity layout) file. In it, add a frame layout which will act as a container for your fragments.
2. Now create your two fragments. This involves creating two xml files that will be inflated inside your fragment's onCreateView method.
3. One of your fragments (the first one) should have a button that the user will be able to click. That means you must attach an onClick listener to it inside the onCreateView method after finding it by id.
4. Now create an interface inside your first fragment and add a method in it that your activity should override after implementing the interface.
5. When the user clicks that button, inside onClick method, you should call the interface method to notify the activity of the click event.
6. Inside the activity, when the method is called, create a new instance of the second fragment and add it to view by replacing the first one - or it depends on whether you are using two-pane layout in your activity - in that case, you just add the fragment.
7. Remember to check if your fragment exists first before simply adding one to view.

I hope these steps help you.

Sample Code

publicclassWizardActivityextendsActivityimplementsSecondFragment.OnButtonClickedListener
{
   private FirstFragment firstFragment;

   publicvoidonCreate(Bundle saveInstanceState)
   {
       super.onCreate(saveInstanceState);

       setContentView(R.layout.main);

       firstFragment = newFirstFragment();

       setFragment(firstFragment, "firstFragment");
   }


   @OverridepublicvoidloadSecondFragment()
   {
       SecondFragmentsecondFragment=newSecondFragment();

       setFragment(secondFragment, "secondFragment");
   }

   publicvoidsetFragment(Fragment frag, String tag)
   {
       FragmentManagerfm= getFragmentManager();
       FragmentTransactionft= fm.beginTransaction();

       Fragmentfragment= getFragmentManager().findFragmentById(R.id.fragmentContainer);
       if(fragment == null)
       {
           ft.add(R.id.fragmentContainer, frag, tag);
       } else {
          ft.replace(R.id.fragmentContainer, frag, tag);
       }

       ft.addToBackStack(null);
       ft.commit()

   }

}

Now the xml file for main layout.

<LinearLayout........><!--add whatever you need here--><FrameLayoutandroid:id="@+id/fragmentContainer"android:layout_width="match_parent"android:layout_height="match_parent"/></LinearLayout>

Now let us create one of your fragments - the first one:

FirstFragment.java

publicclassFirstFragmentextendsFragmentimplementsView.OnClickListener
{
    private Activity mActivity;

    @OverridepublicvoidonAttach(Activity act)
    {
        super.onAttach(act);
        this.mActivity = act;

        /*Initialize whatever you need here*/
    }

    @Overridepublic View onCreateView(LayoutInflator inflator, ViewGroup container, Bundle saveInstanceState)

    {
        Viewv= inflator.inflate(R.layout.first_fragment, container, false);

        Buttonbutton= (Button)v.findViewById(R.id.button);
        button.setOnClickListener(this);
    }


    @OverridepublicvoidonClick(View v)
    {
        ((OnButtonClickListener), mActivity).loadSecondFragment();
    }

    publicinterfaceOnButtonClickListener
    {
        voidloadSecondFragment();
    }
}

You should be able to just create the second fragment and have it loaded in the activity when a button is clicked.

Good luck.