ListView not displaying

Question

I am trying to display a listview of items at the launch of my application.But at the launch of the application no listview is displayed but only a blank screen.Below are the codes:

MainActivity.java

public class MainActivity extends ActionBarActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    }


public static class PlaceholderFragment extends Fragment
{
    ArrayAdapter<String> mForecastAdapter;
    public PlaceholderFragment()
    {}

    @Override
    public View onCreateView(LayoutInflater inflator, ViewGroup v, Bundle savedInstanceState)
    {
        View rootView = inflator.inflate(R.layout.fragment_main, v);

        String[] forecastArray= {
                "Today - Sunny - 88/63",
                "Monday - foggy - 67/20",
                "Tuesday - Sunny - 88/63"
                };

        List<String> weekforecast= new ArrayList<String>(Arrays.asList(forecastArray));

        mForecastAdapter= new ArrayAdapter<String>(
                getActivity(),
                R.layout.list_item_forecast,
                R.id.list_item_forecast_textview,
                weekforecast);

        ListView listview =(ListView)rootView.findViewById(R.id.listview_forecast);
        listview.setAdapter(mForecastAdapter);


        return rootView;
    }


}

}

activity_main.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.sunshineapp.MainActivity" 
tools:ignore="MergeRootFrame" />

fragment_main.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="64dp" 
android:paddingRight="64dp"
android:paddingTop="16dp"
android:paddingBottom="16dp"
tools:context="com.example.sunshineapp.MainActivity$PlaceholderFragment" >

<ListView
    android:id="@+id/listview_forecast"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
     />

list_item_forecast.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:minHeight="?android:attr/listPreferredItemHeight"
android:gravity="center_vertical" 
android:id="@+id/list_item_forecast_textview"/>

Can Someone please guide me with the issue? Thanks in advance!

Edit: As suggested by @Sanjeet I had forgotten to attach the fragment to the activity.So I attached it as follows in the onCreate method of activity:

if(savedInstanceState == null)
    {
    android.app.FragmentManager fragmentManager = getFragmentManager();
    FragmentTransaction fragmentTransaction  =fragmentManager.beginTransaction();
    fragmentTransaction.add(R.id.container, new PlaceholderFragment());
    fragmentTransaction.commit();   

    }

But now I am getting the following in the logcat:

08-03 11:55:37.365: E/AndroidRuntime(20088): FATAL EXCEPTION: main
08-03 11:55:37.365: E/AndroidRuntime(20088): java.lang.RuntimeException:   Unable to start       activity ComponentInfo{com.example.sunshineapp/com.example.sunshineapp.MainActivity}:     java.lang.IllegalStateException: The specified child already has a parent. You must call     removeView() on the child's parent first.
08-03 11:55:37.365: E/AndroidRuntime(20088):    at     android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2343)
08-03 11:55:37.365: E/AndroidRuntime(20088):    at     android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2395)
08-03 11:55:37.365: E/AndroidRuntime(20088):    at android.app.ActivityThread.access$600    (ActivityThread.java:162)

And the application stops..Please help!

I think the list view is shown but it is empty – Coder55 Aug 02 '15 at 17:49 — Coder55, Aug 02 '15 at 17:49
Your onCreate method don't create your fragment. – Rodrigo Henriques Aug 02 '15 at 18:03 — Rodrigo Henriques, Aug 02 '15 at 18:03

score 1 · Answer 1 · answered Aug 02 '15 at 17:56

1

To me somehow helped to update the adapter simply:

ListView listview =(ListView)rootView.findViewById(R.id.listview_forecast);
        listview.setAdapter(mForecastAdapter);
        mForecastAdapter.notifyDataSetChanged();

        return rootView;

answered Aug 02 '15 at 17:56

Mikhail Zhyhimont

23
6

score 1 · Answer 2 · answered Aug 02 '15 at 18:01

1

it seems to me that your mForecastAdapter array is empty. try to add some values inside for testing first.

answered Aug 02 '15 at 18:01

Giorgos Neokleous

1,709
1
14
25

It isn't empty, he initializes it here: `mForecastAdapter= new ArrayAdapter( getActivity(), R.layout.list_item_forecast, R.id.list_item_forecast_textview, weekforecast);` – frgnvola Aug 02 '15 at 18:02

score 1 · Answer 3 · answered Aug 02 '15 at 18:08

1

Try changing

List<String> weekforecast= new ArrayList<String (Arrays.asList(forecastArray));

to

ArrayList<String> weekforecast= new ArrayList<String>(Arrays.asList(forecastArray));

answered Aug 02 '15 at 18:08

frgnvola

518
3
16

score 1 · Answer 4 · edited May 23 '17 at 11:59

1

Try changing

View rootView = inflator.inflate(R.layout.fragment_main, v);

to

View rootView = inflator.inflate(R.layout.fragment_main, v,false);

For more info about false in last parameter. You should check this answer.

Hope this helps.

edited May 23 '17 at 11:59

Community

1
1

answered Aug 02 '15 at 18:14

Ye Min Htut

2,904
15
28

score 1 · Accepted Answer · answered Aug 02 '15 at 18:18

1

You should use

View rootView = inflator.inflate(R.layout.fragment_main, v,false);

instead of

View rootView = inflator.inflate(R.layout.fragment_main, v);

answered Aug 02 '15 at 18:18

Sanjeet A

5,171
3
23
40

What does "false" signify? – ghostrider Aug 02 '15 at 18:44
Where are you attaching this fragment to activity @ghostrider? – Sanjeet A Aug 02 '15 at 18:59
1

I mean i don't see the code for attachment of the fragment to the activity in the snippet you have given. – Sanjeet A Aug 02 '15 at 19:01
Is it this : ' if(savedInstanceState == null) { get SupportFragmentManager().beginTransaction().add(R.id.container,new PlaceholderFragment(),"Hello").commit(); } ' I had commented it in the onCreate method of the activity.. – ghostrider Aug 03 '15 at 05:54

ListView not displaying

5 Answers5