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POonCreate called for two tabs each time one tab is selected
 

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  1. POonCreate called for two tabs each time one tab is selected
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    <p>I have a tabbed application built with fragments and ActionBarSherlock. I have 7 tabs. Here's what's happening.</p> <p>When I select any tab, the onCreate method for the associated fragment is called as expected. The problem is that the onCreate method is called for the next adjacent tab as well. For instance:</p> <ol> <li>App starts in tab1 and onCreate is called as expected</li> <li>tab2 onCreate is called as well (should not happen)</li> <li>-------</li> <li>Click on tab2 and onCreate is called as expected (even though it's already been called)</li> <li>tab3 onCreate is called as well (should not happen)</li> <li>-------</li> <li>Click on tab6 and onCreate is called as expected</li> <li>tab7 onCreate is called as well (should not happen)</li> <li>-------</li> <li>And really weird, click on tab7 (the last tab) </li> <li>tab6 (2nd to last tab) onCreate is called as well (should not happen)</li> </ol> <p>I've read a couple of possible problems and checked to make sure it's not happening here:</p> <ol> <li>Not using unique tag for each tab (they are unique)</li> <li>Emulator has bug that calls onCreate twice (I get the same behavior on my ICS device)</li> </ol> <p>So it's not the two previous possibilities and I'll completely out of ideas. The program runs fine but loading two fragments (which are webviews) takes too much time and isn't the behavior I expected.</p> <p>Here's my code for the main activity onCreate which creates the tab host: <strong>EDITED:</strong></p> <pre><code>public class SynergyWorldwideActivity extends SherlockFragmentActivity { //TabHost mTabHost; ViewPager mViewPager; TabsAdapter mTabsAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Set up the view pager setContentView(R.layout.fragment_tabs_pager); mViewPager = (ViewPager)findViewById(R.id.pager); // Set up action bar final ActionBar bar = getSupportActionBar(); bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); bar.setDisplayShowTitleEnabled(true); //bar.setDisplayShowHomeEnabled(false); // Creat tabs with bundled URLs Bundle tab1Args=new Bundle(), tab2Args=new Bundle(), tab3Args=new Bundle(), tab4Args=new Bundle(), tab5Args=new Bundle(), tab6Args=new Bundle(), tab7Args=new Bundle(); tab1Args.putString("tabURL", getString(R.string.webtab1_URL)); tab2Args.putString("tabURL", getString(R.string.webtab2_URL)); tab3Args.putString("tabURL", getString(R.string.webtab3_URL)); tab4Args.putString("tabURL", getString(R.string.webtab4_URL)); tab5Args.putString("tabURL", getString(R.string.webtab5_URL)); tab6Args.putString("tabURL", getString(R.string.webtab6_URL)); tab7Args.putString("tabURL", getString(R.string.webtab7_URL)); mTabsAdapter = new TabsAdapter(this, mViewPager); mTabsAdapter.addTab(bar.newTab().setText(getString(R.string.webtab1_name)), WebTabFragment.MyWebviewFragment.class, tab1Args); mTabsAdapter.addTab(bar.newTab().setText(getString(R.string.webtab2_name)), WebTabFragment.MyWebviewFragment.class, tab2Args); mTabsAdapter.addTab(bar.newTab().setText(getString(R.string.webtab3_name)), WebTabFragment.MyWebviewFragment.class, tab3Args); mTabsAdapter.addTab(bar.newTab().setText(getString(R.string.webtab4_name)), WebTabFragment.MyWebviewFragment.class, tab4Args); mTabsAdapter.addTab(bar.newTab().setText(getString(R.string.webtab5_name)), WebTabFragment.MyWebviewFragment.class, tab5Args); mTabsAdapter.addTab(bar.newTab().setText(getString(R.string.webtab6_name)), WebTabFragment.MyWebviewFragment.class, tab6Args); mTabsAdapter.addTab(bar.newTab().setText(getString(R.string.webtab7_name)), WebTabFragment.MyWebviewFragment.class, tab7Args); if (savedInstanceState != null) { bar.setSelectedNavigationItem(savedInstanceState.getInt("tab", 0)); } } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putInt("tab", getActionBar().getSelectedNavigationIndex()); } /** * This is a helper class that implements the management of tabs and all * details of connecting a ViewPager with associated TabHost. It relies on a * trick. Normally a tab host has a simple API for supplying a View or * Intent that each tab will show. This is not sufficient for switching * between pages. So instead we make the content part of the tab host * 0dp high (it is not shown) and the TabsAdapter supplies its own dummy * view to show as the tab content. It listens to changes in tabs, and takes * care of switch to the correct paged in the ViewPager whenever the selected * tab changes. */ public static class TabsAdapter extends FragmentPagerAdapter implements ActionBar.TabListener, ViewPager.OnPageChangeListener{ private final Context mContext; //private final TabHost mTabHost; private final ActionBar mActionBar; private final ViewPager mViewPager; private final ArrayList&lt;TabInfo&gt; mTabs = new ArrayList&lt;TabInfo&gt;(); static final class TabInfo { private final Class&lt;?&gt; clss; private final Bundle args; TabInfo(Class&lt;?&gt; _class, Bundle _args) { clss = _class; args = _args; } } public TabsAdapter(FragmentActivity activity, ViewPager pager) { super(activity.getSupportFragmentManager()); mContext = activity; mActionBar = ((SherlockFragmentActivity) activity).getSupportActionBar(); mViewPager = pager; mViewPager.setAdapter(this); mViewPager.setOnPageChangeListener(this); } public void addTab(ActionBar.Tab tab, Class&lt;?&gt; clss, Bundle args) { TabInfo info = new TabInfo(clss, args); tab.setTag(info); tab.setTabListener(this); mTabs.add(info); mActionBar.addTab(tab); notifyDataSetChanged(); } @Override public int getCount() { int iCount = mTabs.size(); return iCount; } @Override public Fragment getItem(int position) { TabInfo info = mTabs.get(position); return Fragment.instantiate(mContext, info.clss.getName(), info.args); } @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { mActionBar.setSelectedNavigationItem(position); } @Override public void onPageScrollStateChanged(int state) { } @Override public void onTabSelected(Tab tab) { Object tag = tab.getTag(); for (int i=0; i&lt;mTabs.size(); i++) { if (mTabs.get(i) == tag) { mViewPager.setCurrentItem(i); } } } @Override public void onTabUnselected(Tab tab) { } @Override public void onTabReselected(Tab tab) { } } } </code></pre> <p>Here's the code for the tab fragments: <strong>EDITED:</strong></p> <pre><code>public class WebTabFragment extends SherlockFragmentActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if(savedInstanceState == null) { FragmentManager fm = getSupportFragmentManager(); if (fm.findFragmentById(android.R.id.content) == null) { MyWebviewFragment myWebView = new MyWebviewFragment(); fm.beginTransaction().add(android.R.id.content, myWebView).commit(); } } } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); //outState.putString("tabNumber", mTabNumber); } public static class MyWebviewFragment extends SherlockFragment { final static private String tag = MyWebviewFragment.class.getSimpleName(); String mTabURL; private WebView mWebView = null; static final int REFRESH_ID = Menu.FIRST; private ProgressDialog spinnerDlg; @Override public void onSaveInstanceState(Bundle outState) { if(mWebView.saveState(outState) == null) Log.i(tag,"Saving state FAILED!"); else Log.i(tag, "Saving state succeeded."); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); setHasOptionsMenu(true); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { menu.add(Menu.NONE, REFRESH_ID, 0, getString(R.string.refresh_string)) .setIcon(R.drawable.ic_action_refresh) .setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case REFRESH_ID: if(mWebView != null) mWebView.reload(); return true; default: return super.onOptionsItemSelected(item); } } /** * When creating, retrieve this instance's number from its arguments. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Tell the framework to try to keep this fragment around // during a configuration change. setRetainInstance(true); mTabURL = getArguments() != null ? getArguments().getString("tabURL") : "http://www.google.com"; } /** * The Fragment's UI is just a simple text view showing its * instance number. */ @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Create view object to return View v = inflater.inflate(R.layout.webview_layout, container, false); // Set up webview object if (mWebView != null) { mWebView.destroy(); } mWebView = (WebView)v.findViewById(R.id.webview_fragment); mWebView.getSettings().setJavaScriptEnabled(true); mWebView.setOnKeyListener(new OnKeyListener(){ @Override public boolean onKey(View v, int keyCode, KeyEvent event) { if ((keyCode == KeyEvent.KEYCODE_BACK) &amp;&amp; mWebView.canGoBack()) { mWebView.goBack(); return true; } return false; } }); // Check to see if it has been saved and restore it if true if(savedInstanceState != null) { if (savedInstanceState.isEmpty()) Log.i(tag, "Can't restore state because bundle is empty."); else { if (mWebView.restoreState(savedInstanceState) == null) Log.i(tag, "Restoring state FAILED!"); else Log.i(tag, "Restoring state succeeded."); } } else { // Load web page mWebView.setWebViewClient(new MyWebViewClient()); mWebView.getSettings().setPluginsEnabled(true); mWebView.getSettings().setBuiltInZoomControls(false); mWebView.getSettings().setSupportZoom(false); mWebView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true); mWebView.getSettings().setAllowFileAccess(true); mWebView.getSettings().setDomStorageEnabled(true); mWebView.loadUrl(mTabURL); } return v; } @Override public void onDestroy() { super.onDestroy(); } @Override public void onDestroyView() { super.onDestroyView(); } @Override public void onPause() { super.onPause(); } @Override public void onResume() { super.onResume(); } @Override public void onConfigurationChanged(Configuration newConfig) { // TODO Auto-generated method stub super.onConfigurationChanged(newConfig); } public class MyWebViewClient extends WebViewClient { @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { // YouTube video link if (url.startsWith("http://youtu.be")) { String urlSubString = url.substring("http://youtu.be/".length()); String newURL = String.format("http://www.youtube.com/v/%s", urlSubString); startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(newURL))); return (true); } return (false); } @Override public void onPageStarted(WebView view, String url, Bitmap favicon) { super.onPageStarted(view, url, favicon); if(spinnerDlg == null) { spinnerDlg = new ProgressDialog(getActivity()); spinnerDlg.setMessage("Loading...."); spinnerDlg.show(); } } @Override public void onPageFinished(WebView view, String url) { super.onPageFinished(view, url); if(spinnerDlg != null) { spinnerDlg.dismiss(); } spinnerDlg = null; } } } } </code></pre>
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