Filtering ListView with custom (object) adapter

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You need to do a few things:

1) In your activity, register for a text change listener on your EditText that contains the value the user enters:

mSearchValue.addTextChangedListener(searchTextWatcher);

2) Create your searchTextWatcher and have it do something:

private TextWatcher searchTextWatcher = new TextWatcher() {
    @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            // ignore
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            // ignore
        }

        @Override
        public void afterTextChanged(Editable s) {
            Log.d(Constants.TAG, "*** Search value changed: " + s.toString());
            adapter.getFilter().filter(s.toString());
        }
    };

3) Override getFilter() in your custom adapter and have it filter the results and notify the listview that the dataset has changed.

    @Override
    public Filter getFilter() {
        return new Filter() {
            @SuppressWarnings("unchecked")
            @Override
            protected void publishResults(CharSequence constraint, FilterResults results) {
                Log.d(Constants.TAG, "**** PUBLISHING RESULTS for: " + constraint);
                myData = (List<MyDataType>) results.values;
                MyCustomAdapter.this.notifyDataSetChanged();
            }

            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                Log.d(Constants.TAG, "**** PERFORM FILTERING for: " + constraint);
                List<MyDataType> filteredResults = getFilteredResults(constraint);

                FilterResults results = new FilterResults();
                results.values = filteredResults;

                return results;
            }
        };
    }

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