我如何使用可滚动的列表视图？

Question

我是android新手。我有一个带有一个开关按钮的列表视图。当我向下滚动时。自第13项起，listview似乎就和第一项一样。例如，当我启用第一项的开关时，第十三项的开关也处于启用状态。（数字取决于滚动前要在屏幕上显示多少项）

Mainactivity.java：

    @Override
public void myOnCheckedChangedHandler(String id, boolean check_status) {

    String rowid = cursor.getString(cursor.getColumnIndex(dbHelper._ID));
    String key = cursor.getString(cursor.getColumnIndex(dbHelper.TITLE));
    String name = cursor.getString(cursor.getColumnIndex(dbHelper.DESC));
    String state = cursor.getString(cursor.getColumnIndex(dbHelper.Switchstate));

    if(new Boolean(check_status).toString().equals("false")){
        state="off";
        dbManager.update(Integer.parseInt(rowid), key, name, state);
        Toast.makeText(this,name +" is "+ state, Toast.LENGTH_SHORT).show();
    }
    if(new Boolean(check_status).toString().equals("true")){
        state = "on";
        dbManager.update(Integer.parseInt(rowid), key, name, state);
        Toast.makeText(this,name +" is "+ state, Toast.LENGTH_SHORT).show();
    }
    refresh();

}

public void refresh(){
    cursor = dbManager.fetch();
    adapter = new MyCustomCursorAdapter(this, cursor);
    users_list.setAdapter(adapter);
}]

listviewadapter.java：

public class MyCustomCursorAdapter extends CursorAdapter {
Mainactivity calling_activity;
private DatabaseHelper dbHelper;

public MyCustomCursorAdapter(Context context, Cursor c) {
    super(context, c, 0);
    this.calling_activity = (LIGHTS) context; //<<<<<<<<<<@@@@@@@@@@@ ADDED for interface
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View view = super.getView(position, convertView, parent);
    return view;
}

@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
    return LayoutInflater.from(context).inflate(R.layout.adapter,parent,false);
}

@Override
public void bindView(final View view, Context context, final Cursor cursor) {
    ((TextView)view.findViewById(R.id.id)).setText(cursor.getString(cursor.getColumnIndex(dbHelper._ID)));
    ((TextView)view.findViewById(R.id.KEYCODE)).setText(cursor.getString(cursor.getColumnIndex(dbHelper.TITLE)));
    ((TextView)view.findViewById(R.id.NAME)).setText(cursor.getString(cursor.getColumnIndex(dbHelper.DESC)));
    ((TextView)view.findViewById(R.id.lightstate)).setText(cursor.getString(cursor.getColumnIndex(dbHelper.Switchstate)));

    ImageView option = view.findViewById(R.id.itemoption);

    Switch thisswitch = view.findViewById(R.id.onoff);
    thisswitch.setTag(cursor.getString(cursor.getColumnIndex(dbHelper.Switchstate)));

    if(cursor.getString(cursor.getColumnIndex(dbHelper.Switchstate)).equals("on")){
        thisswitch.setChecked(true);
    }
    if(cursor.getString(cursor.getColumnIndex(dbHelper.Switchstate)).equals("off")){
        thisswitch.setChecked(false);
    }

    thisswitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {                calling_activity.myOnCheckedChangedHandler((String)buttonView.getTag(),isChecked); 
        }
    });
}}