Getting null pointer even though button is initialized

Question

I have used BaseAdapter to display a custom a list.Now in that i am having a button ,but i am getting null pointer exception.I dont know why this is happening even i have initialized the button.

Code

public class ContactListAdapter extends BaseAdapter {

    private Context context;
    private ArrayList<ContactModel> data;
    DbHandler dbHandler;

    public ContactListAdapter(Context context, ArrayList<ContactModel> data) {
        this.context = context;
        this.data = data;
    }

    @Override

    public int getCount() {
        return data.size();
    }

    @Override
    public Object getItem(int i) {
        return null;
    }

    @Override
    public long getItemId(int i) {
        return 0;
    }

    @Override
    public View getView(final int i, View view, ViewGroup viewGroup) {

        final ViewHolder holder;
        dbHandler = new DbHandler(context);

        if (view == null) {
            holder = new ViewHolder();
            view = LayoutInflater.from(context).inflate(R.layout.contact_custom_list, viewGroup, false);
            holder.tvContact = (TextView) view.findViewById(R.id.tv_contact_name);
            holder.checkBox = (CheckBox) view.findViewById(R.id.cb_contact_checkbox);
            holder.btSend = (Button) view.findViewById(R.id.bt_sharecontact_send);
            view.setTag(holder);
        } else {
            holder = (ViewHolder) view.getTag();
        }

        holder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                if (compoundButton == holder.checkBox) {
                    if (b) {
                        dbHandler.updateContactList(data.get(i).getUserID(), 1);
                    } else {
                        dbHandler.updateContactList(data.get(i).getUserID(), 0);
                    }
                }
            }
        });


        holder.tvContact.setText(data.get(i).getContactName());

        holder.btSend.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                StringBuilder values = new StringBuilder();
                values = dbHandler.getCheckedContact();
            }
        });


        return view;
    }

    private class ViewHolder {
        TextView tvContact;
        CheckBox checkBox;
        Button btSend;
    }
}

LOGCAT

FATAL EXCEPTION: main
    java.lang.NullPointerException
            at example.com.pocketdocs.Group.ContactListAdapter.getView(ContactListAdapter.java:82)
            at android.widget.AbsListView.obtainView(AbsListView.java:2271)
            at android.widget.ListView.measureHeightOfChildren(ListView.java:1270)
            at android.widget.ListView.onMeasure(ListView.java:1182)
            at android.view.View.measure(View.java:15367)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4924)
            at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1420)
            at android.widget.LinearLayout.measureVertical(LinearLayout.java:697)
            at android.widget.LinearLayout.onMeasure(LinearLayout.java:578)
            at android.view.View.measure(View.java:15367)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4924)
            at android.widget.FrameLayout.onMeasure(FrameLayout.java:314)
            at android.view.View.measure(View.java:15367)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4924)
            at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1420)
            at android.widget.LinearLayout.measureVertical(LinearLayout.java:697)
            at android.widget.LinearLayout.onMeasure(LinearLayout.java:578)
            at android.view.View.measure(View.java:15367)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4924)
            at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1420)
            at android.widget.LinearLayout.measureVertical(LinearLayout.java:697)
            at android.widget.LinearLayout.onMeasure(LinearLayout.java:578)
            at android.view.View.measure(View.java:15367)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4924)
            at android.widget.FrameLayout.onMeasure(FrameLayout.java:314)
            at android.view.View.measure(View.java:15367)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4924)
            at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1420)
            at android.widget.LinearLayout.measureVertical(LinearLayout.java:697)
            at android.widget.LinearLayout.onMeasure(LinearLayout.java:578)
            at android.view.View.measure(View.java:15367)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4924)
            at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1420)
            at android.widget.LinearLayout.measureVertical(LinearLayout.java:697)
            at android.widget.LinearLayout.onMeasure(LinearLayout.java:578)
            at android.view.View.measure(View.java:15367)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4924)
            at android.widget.FrameLayout.onMeasure(FrameLayout.java:314)
            at android.view.View.measure(View.java:15367)
            at net.simonvt.menudrawer.OverlayDrawer.onMeasure(OverlayDrawer.java:335)
            at android.view.View.measure(View.java:15367)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4924)
            at android.widget.FrameLayout.onMeasure(FrameLayout.java:314)
            at android.view.View.measure(View.java:15367)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4924)
            at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1420)
            at android.widget.LinearLayout.measureVertical(LinearLayout.java:697)
            at android.widget.LinearLayout.onMeasure(LinearLayout.java:578)
            at android.view.View.measure(View.java:15367)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4924)
            at android.widget.FrameLayout.onMeasure(FrameLayout.java:314)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2154)
            at android.view.View.measure(View.java:15367)
            at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1858)
            at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1106)
            at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1279)
            at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1004)
            at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4223)
            at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
            at android.view.Choreographer.doCallbacks(Choreographer.java:555)
            at android.view.Choreographer.doFrame(Ch

On that button click i am getting some values from the database

To help us debug your problem, please post the stack trace and point us to the line that's causing the problem. What line is giving you the error? — Otra, Aug 21 '14 at 13:44
holder.btSend.setOnClickListener(new View.OnClickListener() { — Anuj, Aug 21 '14 at 13:48
possible duplicate of [What is a Null Pointer Exception, and how do I fix it?](http://stackoverflow.com/questions/218384/what-is-a-null-pointer-exception-and-how-do-i-fix-it) — Code-Apprentice, Aug 21 '14 at 13:49
Note, that you can't compare objects in Java by == operator. You should use equals statement — Denys Vasylenko, Aug 21 '14 at 14:00

laalto · Accepted Answer · 2014-08-21T13:56:39.460

0

NPE in:

holder.btSend.setOnClickListener(...)

Since holder is not null (would have crashed earlier), btSend must be null. There's no other way for an NPE here. btSend is initialized as:

holder.btSend = (Button) view.findViewById(R.id.bt_sharecontact_send);

Your contact_custom_list layout doesn't contain a view with id bt_sharecontact_send and the findViewById() returns null.

edited Aug 21 '14 at 13:56

answered Aug 21 '14 at 13:50

laalto

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Nah i checked with that bt i am having bt_sharecontact_send in my XML – Anuj Aug 21 '14 at 13:52
Srry i sloved the prob it was my mistake nly, that XMl was not having the button – Anuj Aug 21 '14 at 13:56

Getting null pointer even though button is initialized

1 Answers1