NullPointerException at getView method in Adapter

Question

I'm trying to populate a ListView from a SQLite database. When I scroll to the ListView the application crashed and I get a NullPointerException in getView() in the adapter class. How to solve this issue?

Getting NullPointerException at this line:

holder.txtInIt.setText(followUp_List.getShortRGN());

Here is my adapter code.

@Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View row = convertView;
            final Holder holder;
            if (row == null)
            {
                LayoutInflater vi;
                vi = LayoutInflater.from(getContext());
                row = vi.inflate(R.layout.follow_uplist_item, parent, false);
                holder = new Holder();

                holder.txtInIt = (TextView) row.findViewById(R.id.txtInitialLetter);
                holder.txtUserName = (TextView) row.findViewById(R.id.txt_UserName);
                holder.txtDate = (TextView) row.findViewById(R.id.txt_followDate);
                holder.txtFolloUp = (TextView) row.findViewById(R.id.textFolloup);
            }
            else
            {
                holder = (Holder) row.getTag();
            }

            final FollowUp_List followUp_List = data.get(position);

            holder.txtInIt.setText(followUp_List.getShortRGN());
            if (holder.txtInIt.getText().toString().equals("R"))
            {
                holder.txtInIt.setBackgroundResource(R.drawable.red_circle_shape);
            }
            if (holder.txtInIt.getText().toString().equals("G")) {

                holder.txtInIt.setBackgroundResource(R.drawable.green_circle_shape);
            }
            if (holder.txtInIt.getText().toString().equals("N")) {

                holder.txtInIt.setBackgroundResource(R.drawable.blue_circle_shape);
            }


            holder.txtUserName.setText(followUp_List.getCreatedBy());
            holder.txtDate.setText(followUp_List.getFollowup_date());
            holder.txtFolloUp.setText(followUp_List.getFollowUp());

            return row;

        }

        final class Holder {
            TextView txtInIt;
            TextView txtUserName;
            TextView txtDate;
            TextView txtFolloUp;
        }
    }

Here is the logcat information:

10-24 09:54:06.057    5826-5826/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.NullPointerException
            at com.example.tazeen.classnkk.FollowUpList$FollowUpListAdapter.getView(FollowUpList.java:299)
            at android.widget.AbsListView.obtainView(AbsListView.java:2012)
            at android.widget.ListView.makeAndAddView(ListView.java:1772)
            at android.widget.ListView.fillDown(ListView.java:672)
            at android.widget.ListView.fillGap(ListView.java:636)
            at android.widget.AbsListView.trackMotionScroll(AbsListView.java:4546)
            at android.widget.AbsListView.scrollIfNeeded(AbsListView.java:2852)
            at android.widget.AbsListView.onTouchEvent(AbsListView.java:3106)
            at android.view.View.dispatchTouchEvent(View.java:5486)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1953)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1714)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1892)
            at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1371)
            at android.app.Activity.dispatchTouchEvent(Activity.java:2364)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1840)
            at android.view.View.dispatchPointerEvent(View.java:5662)
            at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:2863)
            at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2442)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4340)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
            at dalvik.system.NativeStart.main(Native Method)

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) — Shawn Mehan, Oct 24 '15 at 04:41

Henry · Accepted Answer · 2015-10-24T04:58:35.217

The holder object is null. Hence the exception. So if holder is null, you need to initialize the holder.

Instead of if (row == null) , use if (row == null || holder == null)

Also, inside youif condition, you need to add row.setTag(holder). This is important, only then you can perform the getTag().

So it will be something like this:

            if (row == null || holder == null)
            {
                LayoutInflater vi;
                vi = LayoutInflater.from(getContext());
                row = vi.inflate(R.layout.follow_uplist_item, parent, false);
                holder = new Holder();

                holder.txtInIt = (TextView) row.findViewById(R.id.txtInitialLetter);
                holder.txtUserName = (TextView) row.findViewById(R.id.txt_UserName);
                holder.txtDate = (TextView) row.findViewById(R.id.txt_followDate);
                holder.txtFolloUp = (TextView) row.findViewById(R.id.textFolloup);
                row.setTag(holder);
            }
            else
            {
                holder = (Holder) row.getTag();
            }

Parth Bhayani · Answer 2 · 2015-10-24T05:15:21.557

Please check your layout file, the same you have implemented to your adapter class and after that check your textview id is the same that you have added to your adapter class. I thought your textview id is different as the adapter class.

Just replace the below code into your adapter class

if (row == null)
            {
                LayoutInflater vi;
                vi = LayoutInflater.from(getContext());
                row = vi.inflate(R.layout.follow_uplist_item, parent, null);
                holder = new Holder();

                holder.txtInIt = (TextView) row.findViewById(R.id.txtInitialLetter);
                holder.txtUserName = (TextView) row.findViewById(R.id.txt_UserName);
                holder.txtDate = (TextView) row.findViewById(R.id.txt_followDate);
                holder.txtFolloUp = (TextView) row.findViewById(R.id.textFolloup);
            }
            else
            {
                holder = (Holder) row.getTag();
            }

NullPointerException at getView method in Adapter

2 Answers2