要在Android中使用filterResults()方法显示重复项，您可以按照以下步骤操作：

1. 创建一个自定义适配器类，并继承自BaseAdapter类。在适配器类中，声明一个ArrayList用于存储数据项。

public class CustomAdapter extends BaseAdapter {
    private ArrayList dataList;
    private ArrayList filteredList;

    public CustomAdapter(ArrayList dataList) {
        this.dataList = dataList;
        this.filteredList = new ArrayList<>(dataList);
    }

    // 其他必要的方法

    @Override
    public Filter getFilter() {
        return new Filter() {
            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                FilterResults results = new FilterResults();
                ArrayList filteredData = new ArrayList<>();

                if (constraint == null || constraint.length() == 0) {
                    filteredData.addAll(dataList);
                } else {
                    constraint = constraint.toString().toLowerCase();
                    for (String item : dataList) {
                        if (item.toLowerCase().contains(constraint)) {
                            filteredData.add(item);
                        }
                    }
                }

                results.values = filteredData;
                results.count = filteredData.size();
                return results;
            }

            @Override
            protected void publishResults(CharSequence constraint, FilterResults results) {
                filteredList = (ArrayList) results.values;
                notifyDataSetChanged();
            }
        };
    }

    // 其他必要的方法
}

2. 在Activity中使用自定义适配器类，并设置给ListView。

public class MainActivity extends AppCompatActivity {
    private ListView listView;
    private CustomAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        listView = findViewById(R.id.listView);
        ArrayList dataList = new ArrayList<>();
        // 添加数据项到dataList

        adapter = new CustomAdapter(dataList);
        listView.setAdapter(adapter);

        EditText searchEditText = findViewById(R.id.searchEditText);
        searchEditText.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                adapter.getFilter().filter(s);
            }

            @Override
            public void afterTextChanged(Editable s) {
            }
        });
    }
}

3. 创建一个布局文件activity_main.xml，包含一个ListView和一个用于搜索的EditText。

通过以上步骤，您可以在Android中使用filterResults()方法显示重复项。当用户在搜索框中输入文本时，适配器会过滤数据并更新ListView的显示。