我正在用列表创建searchview但没有得到输出

Question

MainActivity代码

 public class emp_list_activity extends AppCompatActivity {
    ArrayList <String> listview_array,items_code;
    DatabaseHelper mDB;
    ListView employee_list_View;
    SearchView search_view_j;
    MyAdapter myAdapter;

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

        mDB = new DatabaseHelper(this);

        search_view_j = findViewById(R.id.search_view);
        employee_list_View = findViewById(R.id.employee_list);

        listViewData();


    }



    private class MyAdapter extends ArrayAdapter {

        public MyAdapter(Context context, int resource, ArrayList<String> objects) {
            super(context, resource, objects);
        }

        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {
            View v = getLayoutInflater().inflate(R.layout.checkable_list_layout,null);

          return v;
        }
    }
    public  void listViewData(){
        listview_array = new ArrayList<>();
        items_code = new ArrayList<>();
        Cursor res = mDB.get_emp_info();
        if(res.getCount()!=0){
            while (res.moveToNext()){
                listview_array.add(res.getString(2));
                items_code.add(res.getString(1));
            }
        }

        myAdapter = new MyAdapter(emp_list_activity.this,R.layout.checkable_list_layout,listview_array);
        search_view_j.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {
                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
                 myAdapter.getFilter().filter(newText);
                return false;
            }
        });
        employee_list_View.setAdapter(myAdapter);
    }
    }

checkablelistlayout.xml

<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/RelativeLayout01"
android:layout_width="match_parent"
android:layout_height="match_parent">

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textColor="#000000"
    android:textSize="18dp"
    android:layout_marginLeft="10dp"
    android:layout_centerVertical="true"
    android:layout_alignParentLeft="true"
    android:id="@+id/list_tv"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#000000"
        android:textSize="18dp"
        android:layout_marginLeft="3dp"
        android:layout_centerVertical="true"
        android:layout_toRightOf="@id/list_tv"
        android:id="@+id/list_tv_code"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toLeftOf="@id/delete_btn"
        android:theme="@style/AppTheme.blue"
        android:layout_marginLeft="10dp"
        android:textAllCaps="false"
        android:text="edit"
        android:id="@+id/edit_btn"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="right"
        android:theme="@style/AppTheme.red"
        android:textAllCaps="false"
        android:layout_alignParentRight="true"
        android:text="Delete"
        android:id="@+id/delete_btn"/>

</RelativeLayout>

未获得正确的输出。我不知道什么searchview正在搜索数据。我在arrayadapter中给出一个名称列表，并搜索名称，但没有得到输出。所以我要先搜索文本，然后显示第一行，然后在输出中不显示任何内容。