如何让notifyDatasetChanged（）与ListAdapter一起使用？

Question

现在我使用setAdapter更新我的ListView，但我认为正确的方法是使用notifiyDatasetChanged（），我不能让它在我的主类（它在适配器中）工作。 这是错误：

对于ListAdapter类型，方法notifyDatasetChanged（）未定义

我猜这有更好的方法 - 有人能指出我正确的方向吗？

这是我的代码的相关部分：

public class ScoreList extends SherlockFragmentActivity {

    private ListView listViewScore;

    static List<Score> listScore = new ArrayList<Score>();
    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.score_list);
        ctx = this;
        listScore = dbh.getAllScores();

        listViewScore = (ListView) findViewById(R.id.score_list);

        listViewScore.setAdapter(new ScoreListAdapter(ctx,
                R.layout.score_row_item, listScore));
        listViewScore.getAdapter().notifyDatasetChanged(); //this is where I get the error
    }
}

这是适配器：

public class ScoreListAdapter extends ArrayAdapter<Score> {
    private int resource;
    private LayoutInflater inflater;

    public ScoreListAdapter(Context ctx, int resourceId, List<Score> objects) {
        super(ctx, resourceId, objects);
        resource = resourceId;
        inflater = LayoutInflater.from(ctx);
        //context = ctx;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {

        convertView = (LinearLayout) inflater.inflate(resource, null);

        Score score = getItem(position);

        TextView txtName = (TextView) convertView.findViewById(R.id.name);
        txtName.setText(score.getName());

        TextView txtScoreChange = (TextView) convertView
                .findViewById(R.id.scoreChange);
        int scoreChange = Integer.parseInt(score.getScoreChange());
        if (scoreChange > 0)
            txtScoreChange.setText("+" + scoreChange);
        else if (scoreChange < 0)
            txtScoreChange.setText("" + scoreChange);
        else
            txtScoreChange.setText("");

        TextView txtScoreTotal = (TextView) convertView
                .findViewById(R.id.scoreTotal);
        txtScoreTotal.setText(score.getScoreTotal());

        final LinearLayout currentRow = (LinearLayout) convertView
                .findViewById(R.id.scoreRowLayout);                 

        notifyDataSetChanged();
        return convertView;
    }   
}

Answer 1

创建自定义适配器的实例，以便您可以随意使用它...

public class ScoreList extends SherlockFragmentActivity {

private ListView listViewScore;

private ScoreListAdapter adapter;

static List<Score> listScore = new ArrayList<Score>();
@Override
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.score_list);
    ctx = this;
    listScore = dbh.getAllScores();

    listViewScore = (ListView) findViewById(R.id.score_list);

    adapter = new ScoreListAdapter(ctx, R.layout.score_row_item, listScore);
    listViewScore.setAdapter(adapter);
    adapter.notifyDatasetChanged(); 
}
}

顺便说一句，如果您的listScore数组已经加载，那么您不需要使用

adapter.notifyDatasetChanged(); 

Answer 2

不要调用notifyDataSetChanged（）; 创造时的方法。

只有在listViewScore的内容发生变化时才会调用它，并在此时使用它 -

更换

listView.getAdapter().notifyDatasetChanged();

同

((ScoreListAdapter)listView.getAdapter()).notifyDataSetChanged();

并看到魔术......

谢谢。