Finder Function Not Working, Base Adapter Invokes Nullpointer

this app has a textView for input and a button which invoke Finder function. The finder will find the input text in the array of strings and then display them in a listView. Follow

Solution 1:

Your getView() of Adapter is returning null value.

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    if(convertView == null) {
        convertView = new TextView(getApplicationContext());
    }
    ((TextView) convertView).setText(searchList.get(position));
    returnnull; // <<<<<< PROBLEM IS HERE
}

Which must return convertView as below

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    if(convertView == null) {
        convertView = new TextView(getApplicationContext());
    }
    ((TextView) convertView).setText(searchList.get(position));
    return convertView;
}

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Even other methods getItem() and getItemId() are not correctly defined. I would suggest you to read about these methods and how you should override them.

Till then these methods would be like

@Overridepublic Object getItem(int position) {
    if (searchList == null || searchList.isEmpty()) {
        returnnull;
    } else {
        return searchList.get(position);
    }
}

@OverridepubliclonggetItemId(int position) {
    return position; // Better is to return id field of data if you have
}

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And as you are new here I would like to add one more thing, there are identical problem with answers, like java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getImportantForAccessibility()' on a null object reference. So in future try to search first, learn from already answered questions.