Error adding items to ArrayList Java Android

Question

I've been running into a nullPointerException while trying to add items to an arrayList. Below is the function that does that:

public void addToUtilityCardItems() {
        int[] utilitiesLogos = {R.drawable.kenya_power, R.drawable.nairobi_water, R.drawable.startimes, R.drawable.zuku};
        String[] utilitiesNames = {"Kenya Power", "Nairobi Water", "Startimes", "Zuku"};
        UtilitiesModel utilities = new UtilitiesModel();

        for (int i = 0; i < utilitiesNames.length; i++) {
            utilities.setUtilityLogo(utilitiesLogos[i]);
            utilities.setUtilityName(utilitiesNames[i]);
            utilityCardItems.add(utilities);
        }

    }

The error I get is:

java.lang.NullPointerException
            at com.sce.kbs.lient.FragmentTwo.addToUtilityCardItems(FragmentTwo.java:82)
            at com.sce.kbs.lient.FragmentTwo.onActivityCreated(FragmentTwo.java:56)

Kindly assist

Are you instantiated utilityCardItems? Seems that it is not initialized and because of that you are getting NPE. Attach debugger on last line from your question. — Bosko Mijin
– Bosko Mijin, Commented Jan 16, 2016 at 18:19
I would recommend you looking at the debugging functionality of your IDE. For example for android studio. Then look at the value being added in line 82. One of them seems to be null. — DIDoS
– DIDoS, Commented Jan 16, 2016 at 18:20
thanks, I modified this line private List<UtilitiesModel> utilityCardItems=new ArrayList<>();, but it only adds the last item after looping, i.e., 4 similar items of the last item in the arrays — Kabs
– Kabs, Commented Jan 16, 2016 at 18:25

sergiomse · Accepted Answer · 2016-01-16 18:34:42Z

1

If you want to add several utilities object:

public void addToUtilityCardItems() {
        int[] utilitiesLogos = {R.drawable.kenya_power, R.drawable.nairobi_water, R.drawable.startimes, R.drawable.zuku};
        String[] utilitiesNames = {"Kenya Power", "Nairobi Water", "Startimes", "Zuku"};


        for (int i = 0; i < utilitiesNames.length; i++) {
            UtilitiesModel utilities = new UtilitiesModel();
            utilities.setUtilityLogo(utilitiesLogos[i]);
            utilities.setUtilityName(utilitiesNames[i]);
            utilityCardItems.add(utilities);
        }

    }

answered Jan 16, 2016 at 18:34

sergiomse

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