how do you make and populate a listView in a fragment?

Question

I have spent too long to populate a listView in a fragment.

I don't want a list fragment or have it be populated by a DB, just want it populated manually also if you could show how to make it so that you can scroll that would be helpful.

The "rootView.findViewById" comes up with the error "Cannot resolve symbol 'rootView'"

here is my code:

public class Favourites extends Fragment {

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

    View rootView = inflater.inflate(fragment_favourites, container, false);

    String[] favouritefoods = {"Lasagne", "cheese Burrito", "jalepano bread", "chedder cheese"};

    //Build adapter
    ArrayAdapter<String> favefoodadapter = new ArrayAdapter<String>(
            getActivity(), //some context for the activity
            R.layout.favelist, //layout to be displayed(create)
            favouritefoods); //strings to be diplayed



    ListView listView = (ListView) rootView.findViewById(R.id.favefoodslist);
    listView.setAdapter(favefoodadapter);


    return rootView;
}

}

and fragments_favourites.xml:

<RelativeLayout
    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"
tools:context="activity.Favourites"
android:id="@+id/favefoodfragment">

<TextView
    android:id="@+id/favourites_textview"
    android:layout_alignParentTop="true"
    android:layout_marginTop="100dp"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center_horizontal"
    android:textSize="45dp"
    android:text="favourites"
    android:textStyle="bold" />

<TextView
    android:layout_below="@id/favourites_textview"
    android:layout_centerInParent="true"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:textSize="12dp"
    android:layout_marginTop="10dp"
    android:gravity="center_horizontal"
    android:text="Edit fragment_home.xml to change the appearance"
    android:id="@+id/textView3" />

<ListView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/favefoodslist"
    android:layout_below="@+id/textView3"
    android:layout_centerHorizontal="true" />

Please help and put it in plain simple English I am new to this. Thank you.

LOGCAT:

08-18 13:24:57.100  31954-31954/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.example.nrnazz747123.navigationapp, PID: 31954
    java.lang.ClassCastException: android.widget.RelativeLayout cannot be cast to android.widget.ListView
            at activity.Favourites.onCreateView(Favourites.java:40)
            at android.support.v4.app.Fragment.performCreateView(Fragment.java:1786)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:953)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1136)
            at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739)
            at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1499)
            at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:456)
            at android.os.Handler.handleCallback(Handler.java:808)
            at android.os.Handler.dispatchMessage(Handler.java:103)
            at android.os.Looper.loop(Looper.java:193)
            at android.app.ActivityThread.main(ActivityThread.java:5345)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
            at dalvik.system.NativeStart.main(Native Method)

Answer 1

In activity you cannot use this as your context. You need to get activity your fragment belongs to as your context with getActivity().

Next, you cannot perform findViewById() operations before you actually have the view. The view is created in onCreateView, but you are calling it in onCreate already. Everything view related must be performed on view you get from onCreateView. To find your ListView you'll have to move it there and call it

ListView listView = (ListView) rootView.findViewById(R.id.favefoodslist);

EDIT

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

    View rootView = inflater.inflate(fragment_favourites, container, false);

    String[] favouritefoods = {"@@@", "!!!!", "...", "..."};

    //Build adapter
    ArrayAdapter<String> favefoodadapter = new ArrayAdapter<String>(
            getActivity(), //some context for the activity
            R.layout.favelist, //layout to be displayed(create)
            favouritefoods); //strings to be diplayed



    ListView listView = (ListView) rootView.findViewById(R.id.favefoodslist);
    listView.setAdapter(favefoodadapter);         


    return rootView;
}

Answer 2

If you are using static data, you should do it in onCreateView method. If you need to repopulate it when you load data, for example, you should initialize the adapter with an empty ArrayList. When you got the data, copy it to the empty ArrayList and call adapter.notifyDatasetChanged().