Question

I have issues in displaying ListView inside a Fragment. I am using ListFragment in my Fragment. I couldn’t able to figure out where my actual issue is.

CategoriesFragment.java

public class CategoriesFragment extends ListFragment {  
ListView lv;
TextView tv;    
  public CategoriesFragment() {
  }    

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {        
    if(container==null)
        return null;
    inflater.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View view = inflater.inflate(R.layout.categories_fragment,container,false);
    View listView = (ListView)view.findViewById(R.id.listview1);
    return view;        
  }    

  @Override
  public void onActivityCreated(Bundle savedInstanceState) {    
    super.onActivityCreated(savedInstanceState);
    final String[] fruits = new String[] { "Apple", "Avocado", "Banana",
        "Blueberry", "Coconut", "Durian", "Guava", "Kiwifruit"};            
    setListAdapter(new ArrayAdapter<String>
        (getActivity(),R.layout.categories_fragment,fruits));       
  }
}

PagerAdaper.java

public class SectionsPagerAdapter extends FragmentPagerAdapter {
  public SectionsPagerAdapter(FragmentManager fm) {
    super(fm);
  }

  @Override
  public Fragment getItem(int i) {
    switch(i) {
     case 0:
      Fragment fragment = new CategoriesFragment(); 
      return fragment;
      break;
     case 1:
      Fragment fragment = new FeaturedFragment(); 
      return fragment;
      break
    }
    return null;
  }

  @Override
  public int getCount() {
    return 2;
  }

  @Override
  public CharSequence getPageTitle(int position) {
    switch (position) {
      case 0: return "CATEGORIES";
      case 1: return "FEATURED";
    }
    return null;
  }
}

categories_fragment.xml

<?xml version="1.0" encoding="utf-8"?>

<ListView xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/listview1"
  android:layout_width="match_parent"
  android:layout_height="match_parent"/>

DDMS error text:

09-06 12:37:47.402: E/AndroidRuntime(2611): FATAL EXCEPTION: main
09-06 12:37:47.402: E/AndroidRuntime(2611): java.lang.RuntimeException: Your content        must have a ListView whose id attribute is 'android.R.id.list'
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.support.v4.app.ListFragment.ensureList(ListFragment.java:344)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.support.v4.app.ListFragment.onViewCreated(ListFragment.java:145)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:885)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1083)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:635)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1431)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:431)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.support.v4.view.ViewPager.populate(ViewPager.java:895)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.support.v4.view.ViewPager.populate(ViewPager.java:772)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1234)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.view.View.measure(View.java:12723)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1017)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:555)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.view.View.measure(View.java:12723)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.view.View.measure(View.java:12723)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:812)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.view.View.measure(View.java:12723)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
09-06 12:37:47.402: E/AndroidRuntime(2611):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)

Answer 1

Change this

<ListView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/listview1"
android:layout_width="match_parent"
android:layout_height="match_parent"/>

to,

<ListView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"/>

The problem is with the ID. When you extend ListFragment your ListView must have id something like this, @android:id/list