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POReplacing a fragment from ViewPager android
 

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  1. POReplacing a fragment from ViewPager android
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    <h2>SCENARIO</h2> <p>I am creating a fragment structure with dynamic fragment creations. Each item in the fragment creates the next fragment. In the scenario I am storing all these fragments in the ArrayList of fragments so that I can easily replace the created fragment. </p> <h2>PROBLEM</h2> <p>Now I am replacing a fragment from the ArrayList by removing the fragment from a particular index and adding the new one. But when I try to get the fragment from that particular index it returns me the old data without calling the getItem function of the FragmentStateAdapter again.</p> <p>Here is my Main class.</p> <h2>MainActivity.java</h2> <pre><code>public class MainActivity extends FragmentActivity implements onPageSelectedListener { SectionsPagerAdapter mSectionsPagerAdapter; static int current, listItem; static String TAG = "MainActivity"; static ViewPager mViewPager; static ArrayList&lt;Fragment&gt; FragmentList; static ArrayList&lt;String&gt; titles; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); init(); } public void init(){ FragmentList = new ArrayList&lt;Fragment&gt;(); titles = new ArrayList&lt;String&gt;(); mViewPager = (ViewPager) findViewById(R.id.pager); mSectionsPagerAdapter = new SectionsPagerAdapter( getSupportFragmentManager()); mViewPager.setAdapter(mSectionsPagerAdapter); } public void addPage(int position, String title, String file, String tag) { Fragment fragment = new DummySectionFragment(); Bundle args = new Bundle(); args.putString(DummySectionFragment.ARG_FILE_NAME, file); args.putString(DummySectionFragment.ARG_FILE_TAG, tag); args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position); fragment.setArguments(args); titles.add(position, title); FragmentList.add(position, fragment); } public void NextScreen(int position, String title, String file, String tagname) { if(FragmentList.size()&gt;(position-1)){ for(int i=position; i&lt;FragmentList.size(); i++){ FragmentList.remove(i); } } addPage(position, title, file, tagname); mViewPager.setCurrentItem(position); } public static class PageChanger extends ViewPager.SimpleOnPageChangeListener { private int currentPage; @Override public void onPageSelected(int position) { currentPage = position; } public int getCurrentScreen() { return currentPage; } } public class SectionsPagerAdapter extends FragmentStatePagerAdapter { public SectionsPagerAdapter(FragmentManager fm) { super(fm); addPage(0, "Main Fragment", "test.xml", "mytag"); } @Override public Fragment getItem(int position) { return FragmentList.get(position); } @Override public int getCount() { return FragmentList.size(); } @Override public CharSequence getPageTitle(int position) { if (position == 0) { return "Main Categories"; } getItem(position); return titles.get(position); } @Override public void destroyItem(ViewGroup container, int position, Object object) { super.destroyItem(container, position, object); } } public static class DummySectionFragment extends Fragment { public static final String ARG_SECTION_NUMBER = "section_number"; public static final String ARG_FILE_NAME = "file_name"; public static final String ARG_FILE_TAG = "tag_name"; public DummySectionFragment() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { savedInstanceState = this.getArguments(); ListView parent_list = new ListView(getActivity()); String file_name = savedInstanceState.getString(ARG_FILE_NAME); String tag_name = savedInstanceState.getString(ARG_FILE_TAG); int current_level = savedInstanceState.getInt(ARG_SECTION_NUMBER); PullParser pull = new PullParser(getActivity()); pull.pullXml(file_name, tag_name); parent_list.setAdapter(new ListAdapter(getActivity(), PullParser.Xml_Tag_Info, current_level)); return parent_list; } } @Override public void onPageSelected(int pageno) { current = pageno; } } </code></pre>
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