Search in Master/detail flow

Question

I'm trying to implement a search in the link Mastеr / detail flow. but the search itself does not occur. I looked through many examples and did not find a solution. Please help. The error occurs in the 35 filter line

An exception occured during performFiltering()! java.lang.NullPointerException at com.forma.zsuforma.content_field.CustomFilter.performFiltering(CustomFilter.java:35)

There is a body filter mistake in line 35: NullPointerException. I don't know to do.

public class CustomFilter extends Filter{
            public FormaListActivityBeret.MyAdapter adapter;
            public ArrayList<DummyContentBeret.DummyItemBeret> filterList;
            public CustomFilter(ArrayList<DummyContentBeret.DummyItemBeret> filterList,
    FormaListActivityBeret.MyAdapter adapter)
            {
                this.adapter=adapter;
                this.filterList=filterList;

            }

This line is giving me trouble:

           for (int i=0;i<filterList.size();i++)

                    {
                     ...
                    }

Possible duplicate of [What is a NullPointerException, and how do I fix it?](https://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it) — emsimpson92, Sep 25 '18 at 22:55
please, still point to my example)). I've been through many options .... ((( — user9139904, Sep 26 '18 at 06:09
Which line? There are no line numbers for your provided code — emsimpson92, Sep 26 '18 at 17:05
If you're getting a nullpointerexception you're probably passing a null `ArrayList` to your `CustomFilter` class. Find out why you're sending a null `ArrayList` — emsimpson92, Sep 26 '18 at 17:23
and how to find out? file data- public static final List ITEMS = new ArrayList<>(); public static final Map ITEM_MAP = new HashMap<>(); standarrt Android Studio — user9139904, Sep 26 '18 at 17:40
I have no idea what you're trying to say. Have you tried using the debugger? — emsimpson92, Sep 26 '18 at 17:43
Yes, there is no critical error, but the filter does not work and this error in the log — user9139904, Sep 26 '18 at 17:45
Just because the program doesn't crash does not mean there is no critical error. If you're sending a null list then I'd consider that pretty critical unless sending null is intended. Just include the relevant code. — emsimpson92, Sep 26 '18 at 17:47

Search in Master/detail flow

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