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POCall onStart() of Fragment before to display Viewpager, navigation_mode_tabs
 

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  1. POCall onStart() of Fragment before to display Viewpager, navigation_mode_tabs
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    <p>I used a ViewPager and an ActionBar with NavigationMode : "NAVIGATION_MODE_TABS"</p> <p>I put 3 Fragments : Fragment0 (left tab) ,Fragment1 (middle tab),Fragment2(right tab)</p> <p>First, the Fragment0 appears and the methods "onCreateView" and "onStart" are called for Fragment0 AND the Fragment1 </p> <p>If I slide horizontally to go to the "middle tab"(Fragment1), the methods "onCreateView" and "onStart" of Fragment2(right tab) are called...</p> <p>So, I want to know if this is normal ?</p> <p>Because I want to call "onStart" of Fragment2 just before it appears, How do it?</p> <p>My code : </p> <pre><code>public class ActivityPrincipale extends FragmentActivity { private Intent intentService1; private Fragment fragment; [..] private ActionBar.TabListener tabListener; @Override protected void onCreate(Bundle arg0) { super.onCreate(arg0); setContentView(R.layout.viewpager); // Création de la liste de Fragments que fera défiler le PagerAdapter listFragments = new Vector(); // Ajout des Fragments dans la liste des fragments listFragments.add(Fragment.instantiate(this, Fragment0.class.getName())); listFragments.add(Fragment.instantiate(this, Fragment1.class.getName())); listFragments.add(Fragment.instantiate(this, Fragment2.class.getName())); // Création de l'adapter qui s'occupera de l'affichage de la liste de Fragments this.mPagerAdapter = new MyPagerAdapter(super.getSupportFragmentManager(), listFragments); pagerView = (ViewPager) super.findViewById(R.id.viewpager); // affectation de l'adapter au ViewPager pagerView.setAdapter(this.mPagerAdapter); pagerView.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() { @Override public void onPageSelected(int position) { // Quand il y a un swapp entre les page // on selectionne le tab correspondant Log.w("SWAPPING FRAGMENT!!", "swapping de fragment avec comme positin de destination = " + position); getActionBar().setSelectedNavigationItem(position); // DEBUGMODE } }); actionBar = getActionBar(); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); // Create a tab listener that is called when the user changes tabs. tabListener = new ActionBar.TabListener() { public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) { pagerView.setCurrentItem(tab.getPosition()); } public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) { } public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) { } }; actionBar.addTab(actionBar.newTab().setText("Frag0").setTabListener(tabListener)); actionBar.addTab(actionBar.newTab().setText("Frag1"").setTabListener(tabListener)); actionBar.addTab(actionBar.newTab().setText("Frag2").setTabListener(tabListener)); } } </code></pre> <p>One Fragment :</p> <pre><code>public class Fragment0 extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_0, container, false); Log.w("oFragmento", "fragment0"); return rootView; } } </code></pre> <p>My PagerAdapter :</p> <pre><code>public class MyPagerAdapter extends FragmentPagerAdapter { private final List fragments; public MyPagerAdapter(FragmentManager fm, List list_fragments) { super(fm); this.fragments = list_fragments; } @Override public Fragment getItem(int position) { return (Fragment) fragments.get(position); } @Override public int getCount() { return this.fragments.size(); } } </code></pre>
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