android-fragmentactivity

I am using ViewPager to allow user to swipe between fragments. How can I add a the title of each fragment to the screen? package com.multi.andres; import java.util.List; import java.util.Vector; import com.viewpagerindicator.TitlePageIndicator; import com.viewpagerindicator.TitleProvider; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter; import android.support.v4.view.ViewPager; public class ViewPagerFragment extends FragmentActivity

Im trying to implement fragment to activity communication. Went through android developer doc where an Activity object is passed to onAttach life cycle and set up the Fragment-Activity communication. This documentation asks to pass Context object instead of Activity. I replaced all the Activity objects by Context objects in the life cycle method onAttach. But it is throwing a NullPointerException while calling the method of the interface from Fragment. @Override public void onAttach(Context context) { super.onAttach(context); try { colourChangerInterface = (ColourChangerInterface) context; }

I have default Master-Detail flow, which was created automatically when creating new project. My question is. When I add a button to detail side. Is there a way to update my list side by pressing that button ? In other words, can ItemDetailFragment and ItemListFragment communicate ? Yes just communicate through the activity with a listener. Your activity: public class MyActivity extends FragmentActivity implements OnFragmentClickListener { @Override public void OnFragmentClick(int action, Object object) { switch(action) { } } } The listener class: public interface OnFragmentClickListener {

This question already has an answer here: What is the use case for a Fragment with no UI? 5 answers I am going through the Android documentation on Fragments . The layout that defines the UI of a Fragment may be defined in the layout of the Activity, in a separate .xml file or not at all. According to the documentation you can also use a fragment to provide a background behavior for the activity without presenting additional UI. Why would I need to use another Fragment to add functionality to an Activity instead of defining a few more functions within the Activity? Would such a non-UI Fragment