android null pointer exception setting adapter for custom list on fragment

Question

I have a project with fragments working ok, im using actionbarsherlock, and sliding menu by jeremyfeinstein,

all is working fine, but when I want to customize the left drawer list cells, i get an exception

NullPointerException

here my code,

for showing the left table working fine on basic mode for list , simple_list_item_1

but when I customize it, I get the exception,

here the list [PhoneMenuList.java]:

 public class PhoneMenuList extends SherlockListFragment{

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

    return super.onCreateView(inflater, container, savedInstanceState);  

}

@Override
public void onActivityCreated(Bundle savedInstanceState){
    super.onActivityCreated(savedInstanceState);

    //SET THE LIST ADAPTER!

    Hamburger hambu_data[] = new Hamburger[]
            {
                new Hamburger(R.drawable.icon_hambu_folder, "My Documents"),
                new Hamburger(R.drawable.icon_hambu_favs, "Top 10 viewed"),
                new Hamburger(R.drawable.icon_hambu_validate, "Validate"),
                new Hamburger(R.drawable.icon_hambu_how, "How to use"),
                new Hamburger(R.drawable.icon_hambu_how, "About")
            };              




        ListView productList= (ListView) getActivity().findViewById(R.id.listView1);

      //for context!
        HamburgerAdapter adapter = new HamburgerAdapter(getActivity(), R.layout.hamburger_item_row, hambu_data);            


        /*
        View header = (View)getLayoutInflater(savedInstanceState).inflate(R.layout.hamburger_item_row, null);
        productList.addHeaderView(header);


        productList.setAdapter(adapter);

        */       
} 
 }

on list.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"
    android:divider="#000000"
    android:dividerHeight="1dip" />

hamburguer item row

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding="10dp">

     <ImageView android:id="@+id/imgIcon"
        android:layout_width="wrap_content"
        android:layout_height="fill_parent"
        android:gravity="center_vertical"
        android:layout_alignParentTop="true"
        android:layout_alignParentBottom="true"
        android:layout_marginRight="15dp"
        android:layout_marginTop="5dp"
        android:layout_marginBottom="5dp" />

     <TextView android:id="@+id/txtTitle"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="center_vertical"
        android:layout_alignParentTop="true"
        android:layout_alignParentBottom="true"
        android:textStyle="bold"
        android:textSize="22dp"
        android:textColor="#000000"
        android:layout_marginTop="5dp"
        android:layout_marginBottom="5dp" />

</LinearLayout>

so how to fix the exception when i set my adapter

productList.setAdapter(adapter);

Thanks!

edit 1

HamburgerAdapter.java

public class HamburgerAdapter extends ArrayAdapter<Hamburger>{

    Context context; 
    int layoutResourceId;    
    Hamburger data[] = null;


    public HamburgerAdapter(Context context, int layoutResourceId, Hamburger[] data) {
        super(context, layoutResourceId, data);

        this.layoutResourceId = layoutResourceId;
        this.context = context;
        this.data = data;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View row = convertView;
        WeatherHolder holder = null;

        if(row == null)
        {
            //inflater for fragment!

            LayoutInflater inflater = ((Activity)context).getLayoutInflater();



            row = inflater.inflate(layoutResourceId, parent, false);

            holder = new WeatherHolder();
            holder.imgIcon = (ImageView)row.findViewById(R.id.imgIcon);
            holder.txtTitle = (TextView)row.findViewById(R.id.txtTitle);

            row.setTag(holder);
        }
        else
        {
            holder = (WeatherHolder)row.getTag();
        }

        Hamburger hamburger = data[position];
        holder.txtTitle.setText(hamburger.title);
        holder.imgIcon.setImageResource(hamburger.icon);

        return row;
    }

    static class WeatherHolder
    {
        ImageView imgIcon;
        TextView txtTitle;
    }

}

edit 2,

Exception , when using:

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

   // return super.onCreateView(inflater, container, savedInstanceState);  

    View mView = inflater.inflate(R.layout.list, container, false);
    return mView; 
}

01-01 11:43:27.110: W/dalvikvm(14502): threadid=1: thread exiting with uncaught exception (group=0x410292a0)
01-01 11:43:27.110: E/AndroidRuntime(14502): FATAL EXCEPTION: main
01-01 11:43:27.110: E/AndroidRuntime(14502): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.chocolate.tiks_documents/com.chocolate.tiks_documents.MainActivityPhone}: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
01-01 11:43:27.110: E/AndroidRuntime(14502):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2100)
01-01 11:43:27.110: E/AndroidRuntime(14502):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
01-01 11:43:27.110: E/AndroidRuntime(14502):    at android.app.ActivityThread.access$600(ActivityThread.java:140)
01-01 11:43:27.110: E/AndroidRuntime(14502):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
01-01 11:43:27.110: E/AndroidRuntime(14502):    at android.os.Handler.dispatchMessage(Handler.java:99)
01-01 11:43:27.110: E/AndroidRuntime(14502):    at android.os.Looper.loop(Looper.java:137)
01-01 11:43:27.110: E/AndroidRuntime(14502):    at android.app.ActivityThread.main(ActivityThread.java:4898)
01-01 11:43:27.110: E/AndroidRuntime(14502):    at java.lang.reflect.Method.invokeNative(Native Method)
01-01 11:43:27.110: E/AndroidRuntime(14502):    at java.lang.reflect.Method.invoke(Method.java:511)
01-01 11:43:27.110: E/AndroidRuntime(14502):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
01-01 11:43:27.110: E/AndroidRuntime(14502):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
01-01 11:43:27.110: E/AndroidRuntime(14502):    at dalvik.system.NativeStart.main(Native Method)
01-01 11:43:27.110: E/AndroidRuntime(14502): Caused by: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
01-01 11:43:27.110: E/AndroidRuntime(14502):    at android.support.v4.app.ListFragment.ensureList(ListFragment.java:344)
01-01 11:43:27.110: E/AndroidRuntime(14502):    at android.support.v4.app.ListFragment.onViewCreated(ListFragment.java:145)
01-01 11:43:27.110: E/AndroidRuntime(14502):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:941)
01-01 11:43:27.110: E/AndroidRuntime(14502):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
01-01 11:43:27.110: E/AndroidRuntime(14502):    at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
01-01 11:43:27.110: E/AndroidRuntime(14502):    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1460)
01-01 11:43:27.110: E/AndroidRuntime(14502):    at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:556)
01-01 11:43:27.110: E/AndroidRuntime(14502):    at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1167)
01-01 11:43:27.110: E/AndroidRuntime(14502):    at android.app.Activity.performStart(Activity.java:5216)
01-01 11:43:27.110: E/AndroidRuntime(14502):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2073)
01-01 11:43:27.110: E/AndroidRuntime(14502):    ... 11 more

Post your code for HamburgerAdapter please.

nedaRM
– nedaRM

2013-09-12 05:12:00 +00:00
Commented Sep 12, 2013 at 5:12 — nedaRM
– nedaRM, Commented Sep 12, 2013 at 5:12
@user2045570 thanks, I have placed adapter code

manuelBetancurt
– manuelBetancurt

2013-09-12 05:17:06 +00:00
Commented Sep 12, 2013 at 5:17 — manuelBetancurt
– manuelBetancurt, Commented Sep 12, 2013 at 5:17

Jon · Accepted Answer · 2013-09-12 05:22:58Z

3

You forgot to set the ID for your list item. Your adapter will also want to handle delegating information about the data it contains. Overriding getCount() can be used to determine how many items you have and how many views the base adapter should try to create.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/hamburger_item_row"
    android:orientation="horizontal" 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding="10dp">

     <ImageView android:id="@+id/imgIcon"
        android:layout_width="wrap_content"
        android:layout_height="fill_parent"
        android:gravity="center_vertical"
        android:layout_alignParentTop="true"
        android:layout_alignParentBottom="true"
        android:layout_marginRight="15dp"
        android:layout_marginTop="5dp"
        android:layout_marginBottom="5dp" />

     <TextView android:id="@+id/txtTitle"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="center_vertical"
        android:layout_alignParentTop="true"
        android:layout_alignParentBottom="true"
        android:textStyle="bold"
        android:textSize="22dp"
        android:textColor="#000000"
        android:layout_marginTop="5dp"
        android:layout_marginBottom="5dp" />

</LinearLayout>

For the adapter you'll want to add the following

@Override
public int getCount() {
    return data.size();    //Base adapter needs to now how many items to create
}

edited Sep 12, 2013 at 5:22

answered Sep 12, 2013 at 5:11

Jon

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1 Comment

manuelBetancurt Over a year ago

thank you, that is right! I placed android:id="@+id/hamburger_item_row" on my xml, but still have a null pointer exception cheers

Jon · Accepted Answer · 2013-09-12 05:42:12Z

2

try using following code

public class PhoneMenuList extends SherlockFragment {

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

    View mView = inflater.inflate(R.layout.list, container, false);
    return mView;  

}

edited Sep 12, 2013 at 5:42

Jon

1,3889 silver badges14 bronze badges

answered Sep 12, 2013 at 5:15

Ketan Ahir

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4 Comments

manuelBetancurt Over a year ago

hi thanks, I tried and get this error: Unable to start activity ComponentInfo{ Resources$NotFoundException: Resource ID #0x7f040049 type #0x12 is not valid, what to do? thanks!

Ketan Ahir Over a year ago

which class not found ? post full log.

Ketan Ahir Over a year ago

use PhoneMenuList extends SherlockFragment. Do not use PhoneMenuList extends SherlockListFragment.

Ketan Ahir Over a year ago

Always Welcome dear !!

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