Question

我已填充ArrayAdapter ArrayList。每次我点击其中任何一个项目时，我都会重新填充ArrayList并将notifyOnDataSetChange()发送到adapter。但是对于我来说未知的原因，它在ArrayList方法中超出了getView()范围，它填充了它的项目。我不明白为什么会这样。你们能解释一下getView() invokation的理论，所以我理解为什么会这样。提前谢谢！

这是：

class MAdapter extends ArrayAdapter<String> {
    public MAdapter(Context context, int textViewResourceId, List<String> objects) {
        super(context, textViewResourceId, objects);
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View v = convertView;
    if (v == null) {
        LayoutInflater vi = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v = vi.inflate(R.layout.file_explorer_row, null);
    } else {

    }

        String txt = itemsList.get(position); // Out of bounds happens here
        if (!txt.equals("")) {
            TextView tt = (TextView) v.findViewById(R.id.file_explorer_tv_filename);
            tt.setText(txt);
        }

    return v;
}

itemsList在外类声明。

Answer 1

像这样改变

public View getView(int position, View convertView, ViewGroup parent) {         
        View view = convertView;
        if (view == null) 
        {              
            LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);          
            view = inflater.inflate(R.layout.file_explorer_row, parent, false);
        }

Answer 2

String txt = itemsList.get(position);
itemsList.get(position)返回一个Integer Value，并且您尝试存储在String中。这可能是原因。

Answer 3

虽然我没有清楚地了解你在问什么......我假设你正在重新填充整个ArrayAdapter ....

所以试试这个.........

在将适配器设置为ListView之前，在ListView上使用removeView（）

例如：

ListView.removeView(); 
ListView.setAdapter(yourAdapter);

Answer 4

试试这段代码：

class MAdapter extends BaseAdapter {
    List<String> objects;
    Context context;
    public MAdapter(Context context,List<String> objects) {
        super();
        this.context=context;
        this.objects=objects;
    }



    public int getCount() {
        return objects.size();
    }

    public Object getItem(int position) {
        return position;
    }

    public long getItemId(int position) {
        return 0;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
    View v = convertView;
    Holder holder;
    LayoutInflater vi;
    if (v == null) {
        holder=new Holder();
        vi = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v = vi.inflate(R.layout.file_explorer_row, null);
        holder.tt= (TextView) v.findViewById(R.id.file_explorer_tv_filename);
        v.setTag(holder);
    } else {
        holder = (Holder) v.getTag();
    }
        String txt = objects.get(position); // Out of bounds happens here
        if (!txt.equals("")) {
            holder.tt.setText(txt);
        }

    return v;
}

static class Holder{
    TextView tt;
}
}

ArrayAdapter超越了界限

4 个答案: