Adding listview to a fragment in android app

Question

I am working on a app where I have 4 fragments. Now I want to add listview on the fragments. I have tried various links from google but haven't been able to do it.

My Code for Fragment class:

public class ExerciseActivity extends Fragment {

public static final String ARG_SECTION_NUMBER = "section_number";

public ExerciseActivity() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    // Create a new TextView and set its text to the fragment's section
    // number argument value.
    View V = inflater.inflate(R.layout.fragment_exercise,container,false);
    //View V = inflater.inflate(R.layout.mainList, container, false);

    ListView LV = (ListView) this.getActivity().findViewById(R.id.mainList);
    String List[] = new String[2];
    List[0] = "tst1";
    List[1] ="tst2";
    ArrayAdapter<String> aa = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, List);

    LV.setAdapter(aa);

    return V;
}
}

Following is my code for xml of the fragment:

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

Whenever I try to run my app I am getting following error:

05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): 05-29 00:11:42.680: E/AndroidRuntime(1298): FATAL EXCEPTION: main java.lang.RuntimeException: Unable to start activity ComponentInfo{com.kris.fittracker/com.kris.fittracker.MainActivity}: java.lang.NullPointerException at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980) at android.app.ActivityThread.access$600(ActivityThread.java:122) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:4340) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.NullPointerException at com.kris.fittracker.ExerciseActivity.onCreateView(ExerciseActivity.java:31) at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:938) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1097) at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:1895) at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:566) at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1133) at android.app.Activity.performStart(Activity.java:4475) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1928)

Simon Dorociak · Accepted Answer · 2014-05-28 18:46:41Z

2

Problem is that:

ListView LV = (ListView) this.getActivity().findViewById(R.id.mainList);

getActivity() context don't know about mainList, you need to use proper View that contains ListView with that id:

ListView LV = (ListView) V.findViewById(R.id.mainList);

and that View I'm talking about is your View named as V. Now it should works.

answered May 28, 2014 at 18:46

Simon Dorociak

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Comments

Shijil · Accepted Answer · 2014-05-28 18:46:48Z

1

if your listview contain in R.layout.fragment_exercise layout file, change listview mapping to

 ListView LV = (ListView)V.findViewById(R.id.mainList);

answered May 28, 2014 at 18:46

Shijil

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Comments

Rod_Algonquin · Accepted Answer · 2014-05-28 18:47:04Z

1

The problem is that you are getting a view from the main activity layout..

ListView LV = (ListView) this.getActivity().findViewById(R.id.mainList);

this.getAcitivity is the main activity..

solution:

Use the view you just inflated

ListView LV = (ListView) V.findViewById(R.id.mainList);

answered May 28, 2014 at 18:47

Rod_Algonquin

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Jakub S. · Accepted Answer · 2016-03-14 08:36:56Z

0

My full code (listview is declared above as "private ListView listView;")

 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    v = inflater.inflate(R.layout.second_fragment, container, false);
    listView = (ListView) v.findViewById(R.id.times_listView);
 return v;
 }

answered Mar 14, 2016 at 8:36

Jakub S.

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