搜索过滤器不在列表视图中显示搜索到的项目

Question

我正在制作一个应用程序，它将允许用户添加其图片和名称，然后将其显示在列表视图中。此外，我还为他们添加了搜索功能。

创建搜索过滤器时，代码运行良好，但是，当我向其中添加一个sqlite数据库时，它搞砸了。当我尝试搜索时，除了列表中所有添加的数据外，它什么都不会显示。

这是我的代码的片段：

DatabaseHelper db;

        Uri imageUri;
        EditText textsearch;
        ListView lv;
        AlertDialog.Builder builder;
        ArrayList<Names> list = new ArrayList<Names>(); //this is my reference list
        ArrayList<Names> displaylist = new ArrayList<Names>(); //arraylist to display all data
        ArrayList<Names> anotherlist = new ArrayList<>();
        ArrayList<Names> findlist = new ArrayList<>();
        Adapter adapter;
        private Names names = new Names();

        private static final int PICK_IMAGE = 100;

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

            textsearch = (EditText) findViewById(R.id.textsearch);
            lv = (ListView) findViewById(R.id.listview);

            db = new DatabaseHelper(this);
            displaylist = db.getAll();

            adapter = new Adapter(this, displaylist);
            madapter = new Adapter(this,findlist);
            final Adapter myadapter = new Adapter(this, list);
            lv.setAdapter(adapter);
            adapter.notifyDataSetChanged();

            //
            builder = new AlertDialog.Builder(this);
            lv.setOnItemClickListener(this);

            this.textsearch.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) {
                    list.clear();
                    String s1 = s.toString();
                    Pattern pattern = Pattern.compile(s1);

                    for (int i=0; i<displaylist.size(); i++){
                        String find = displaylist.get(i).getName().toLowerCase();
                        Matcher matcher = pattern.matcher(find);
                        if(matcher.find()){
                            list.add(displaylist.get(i));
                            lv.setAdapter(adapter);
                            adapter.notifyDataSetChanged();
                        }//end if
                    }
                }

                @Override
                public void afterTextChanged(Editable s) {

                }
            });
        }