Android IllegalStateException: Fragment not attached to Activity webview

Question

So I'm new to android app writing, and I am trying to work on a practice app that I can hopefully turn into something later. I had 3 tabs in the actionbar that ran fine before I decided to try to add webview to one of them. Now it crashes with an IllegalStateException. And since I don't know too much about android at the moment, I can't seem to figure out what is wrong.

The main activity:

private ViewPager viewPager; private TabsPagerAdapter mAdapter; private ActionBar actionBar; private String[] tabs = { "Web", "Facebook", "Twitter" };  @SuppressLint("NewApi") @Override protected void onCreate(Bundle savedInstanceState)  {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);      // Initialization     viewPager = (ViewPager) findViewById(R.id.pager);     actionBar = getActionBar();     mAdapter = new TabsPagerAdapter(getSupportFragmentManager());      viewPager.setAdapter(mAdapter);     actionBar.setHomeButtonEnabled(false);     actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);              // Adding Tabs     for (String tab_name : tabs)      {         actionBar.addTab(actionBar.newTab().setText(tab_name).setTabListener(this));     }      /**      * on swiping the viewpager make respective tab selected      * */     viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener()      {          @Override         public void onPageSelected(int position)          {             // on changing the page             // make respected tab selected             actionBar.setSelectedNavigationItem(position);         }          @Override         public void onPageScrolled(int arg0, float arg1, int arg2)          {         }          @Override         public void onPageScrollStateChanged(int arg0)          {         }     }); }  @Override public void onTabReselected(Tab tab, FragmentTransaction ft)  { }  @Override public void onTabSelected(Tab tab, FragmentTransaction ft)  {     // on tab selected     // show respected fragment view     viewPager.setCurrentItem(tab.getPosition()); }  @Override public void onTabUnselected(Tab tab, FragmentTransaction ft)  { } 

The WebFragment with the webview:

public class WebFragment extends Fragment  {  private String url = getString(R.string.website);  //@Override //public void onActivityCreated(Bundle savedInstanceState)  //{     //super.onActivityCreated(savedInstanceState); //}  @SuppressLint("SetJavaScriptEnabled") @Override public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState)  {      View rootView = inflater.inflate(R.layout.web_fragment, container, false);      WebView tolerableWebView = (WebView) getView().findViewById(R.id.webview);     tolerableWebView.getSettings().setJavaScriptEnabled(true);     tolerableWebView.loadUrl(url);      return rootView; }  } 

the TabsPagerAdapter:

public class TabsPagerAdapter extends FragmentPagerAdapter {  public TabsPagerAdapter(FragmentManager fm)  {     super(fm); }  @Override public Fragment getItem(int index)  {      switch (index) {     case 0:         // Top Rated fragment activity         return new WebFragment();     case 1:         // Games fragment activity         return new FacebookFragment();     case 2:         // Movies fragment activity         return new TwitterFragment();     }      return null; }  @Override public int getCount()  {     // get item count - equal to number of tabs     return 3; } } 

The webfragment xml

<?xml version="1.0" encoding="utf-8"?> <WebView xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/webview"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:orientation="vertical">  </WebView> 

The main activity xml:

<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/pager"     android:layout_width="match_parent"     android:layout_height="match_parent"/> 

Any help would be great! Thanks

Answer 1

Generally you get that error when you try to perform work after the Fragment is no longer attached to the Activity. In the callback that triggers the IllegalStateException add a check for isAdded: http://developer.android.com/reference/android/app/Fragment.html#isAdded()

if(!isAdded()) {     return; }