java - 当列为空时，如何使用 BaseAdapter 动态删除一行表？

Question

我的问题在上面。我的代码如下。 如您所见，一些数据是空的，例如“20:11”、“”、“11:25”…… 我希望当字段为空时立即删除布局 inflate 中的行，或者当字段不为空时动态创建更好的解决方案。

public class Zlecenia extends Activity {

    ListView listview;

    ArrayList<ListData> myList = new ArrayList<>();

    String[] strefa = new String[]{
            "Jerozolimskie 20/22", "Title 2", "Title 3", "Title 4",
            "Title 5", "Title 6", "Title 7", "Title 8"
    };
    String[] adres = new String[]{
            "Desc 1", "Desc 2", "Desc 3", "Desc 4",
            "Desc 5", "Desc 6", "Desc 7", "Desc 8"
    };
    String[] data = new String[]{
            "20:11", "", "11:25", "", "15:11", "11:25", "15:11", "11:25"
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.zlecenia);

        listview = (ListView) findViewById(R.id.listView);

        for (int i = 0; i < strefa.length; i++) {
            ListData ld = new ListData();
            ld.setStrefa(strefa[i]);
            ld.setAdres(adres[i]);
            ld.setData(data[i]);
            myList.add(ld);
        }

        listview.setAdapter(new MyBaseAdapter(this, myList));

    }

}

和 BaseAdapter:

public class MyBaseAdapter extends BaseAdapter {

// Other methods of extends BaseAdapter
...

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        MyViewHolder mViewHolder;

        if (convertView == null) {
            convertView = inflater.inflate(R.layout.zlecenia_lista, parent, false);
            mViewHolder = new MyViewHolder(convertView);
            convertView.setTag(mViewHolder);
        } else {
            mViewHolder = (MyViewHolder) convertView.getTag();
        }

        ListData currentListData = getItem(position);

        mViewHolder.strefa.setText(currentListData.getStrefa());
        mViewHolder.adres.setText(currentListData.getAdres());
        mViewHolder.data.setText(currentListData.getData());

        return convertView;
    }

    private class MyViewHolder {
        TextView strefa, adres, data;

        public MyViewHolder(View item) {
            strefa = (TextView) item.findViewById(R.id.strefa);
            adres = (TextView) item.findViewById(R.id.adres);
            data = (TextView) item.findViewById(R.id.data);
        }
    }

}

Answer 1

因此，如果数据等于“”，您希望删除(隐藏)列表的所有行(项目)

这里是我的建议:

public class MyBaseAdapter extends BaseAdapter {

// Other methods of extends BaseAdapter
...

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        MyViewHolder mViewHolder;

        if (convertView == null) {
            convertView = inflater.inflate(R.layout.zlecenia_lista, parent, false);
            mViewHolder = new MyViewHolder(convertView);
            convertView.setTag(mViewHolder);
        } else {
            mViewHolder = (MyViewHolder) convertView.getTag();
        }

        ListData currentListData = getItem(position);

        mViewHolder.strefa.setText(currentListData.getStrefa());
        mViewHolder.adres.setText(currentListData.getAdres());
        mViewHolder.data.setText(currentListData.getData());
        // try this
        if(currentListData.getData().equals("")) {
              convertView.setVisibility(View.GONE) // all the row is hided
        }else {
              convertView.setVisibility(View.VISIBLE) // display the row
        }
        return convertView;
    }

    private class MyViewHolder {
        TextView strefa, adres, data;

        public MyViewHolder(View item) {
            strefa = (TextView) item.findViewById(R.id.strefa);
            adres = (TextView) item.findViewById(R.id.adres);
            data = (TextView) item.findViewById(R.id.data);
        }
    }

}

希望对您有所帮助，如果有任何问题请发表评论!

祝你好运!