Question

我已经使用数组适配器创建了自定义列表视图。它包含一个Edittext和一些其他的radiobuttons等。我的列表视图显示每4个视图后重复的视图。即我输入第一个Edittext，它也输入了第五个EditText。我已经读过，为了节省内存，android只创建有限的视图并重复它。那么，如何克服这个问题呢？如何使用bindView（）方法？在哪里？怎么样？

ublic class QuestionAdapter扩展了ArrayAdapter {

Context context; 

int layoutResourceId;    
Question data[] = null;

public QuestionAdapter(Context context, int layoutResourceId, Question[] data) {
    super(context, layoutResourceId, data);
    this.layoutResourceId = layoutResourceId;
    this.context = context;
    this.data = data;
}

@SuppressLint("NewApi")
@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View row = convertView;
    final WeatherHolder holder;

    if(row == null)
    {
        LayoutInflater inflater = ((Activity)context).getLayoutInflater();          
        row = inflater.inflate(layoutResourceId, parent, false);
        //row = inflater.inflate(R.layout.listview_item_row, null);
        holder = new WeatherHolder();
        holder.txtquestion = (TextView)row.findViewById(R.id.txtquestion);
        holder.radioYes = (RadioButton)row.findViewById(R.id.radioYes);
        holder.radioNo= (RadioButton)row.findViewById(R.id.radioNo);
        holder.editResponse=(EditText)row.findViewById(R.id.editResponse);
        holder.radio_group=(RadioGroup)row.findViewById(R.id.radio_group);

        row.setTag(holder);


    }
    else

    {
        holder = (WeatherHolder)row.getTag();
    }

    Question question = data[position];
    holder.txtquestion.setText(question.question);
    holder.radioYes.setChecked(true);
    holder.radioYes.setChecked(false);

    //holder.editResponse.setText("Edit Response");
    return row;

}



static class WeatherHolder
{
    TextView txtquestion;
    RadioButton radioYes;
    RadioButton radioNo;
    EditText editResponse;
    RadioGroup radio_group;
}

}

Answer 1

在getView（）中，您必须为每个ViewText手动分配每个视图的值。您可以在getView中执行edtitext.setText（“”），当您在一个edittext中编写时，您的列表视图将不会显示重复。

编辑：

您可以尝试使用一种结构来保存每个EditText中的文本，并在getView（）内部将这些文本分配给其EditText

String [] text ;

Question data[] = null;

public QuestionAdapter(Context context, int layoutResourceId, Question[] data) {
    super(context, layoutResourceId, data);
    this.layoutResourceId = layoutResourceId;
    this.context = context;
    this.data = data;

    text = new String[data.length];

    for(String s: text)
        s="";
}

public View getView(int position, View convertView, ViewGroup parent) {
    View row = convertView;
    final WeatherHolder holder;
    final pos = position;

    if(row == null)
    {
        LayoutInflater inflater = ((Activity)context).getLayoutInflater();          
        row = inflater.inflate(layoutResourceId, parent, false);
        //row = inflater.inflate(R.layout.listview_item_row, null);
        holder = new WeatherHolder();
        holder.txtquestion = (TextView)row.findViewById(R.id.txtquestion);
        holder.radioYes = (RadioButton)row.findViewById(R.id.radioYes);
        holder.radioNo= (RadioButton)row.findViewById(R.id.radioNo);
        holder.editResponse=(EditText)row.findViewById(R.id.editResponse);
        //Add a listener and you'll know the text inside EditText
        holder.editResponse.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            // TODO Auto-generated method stub

        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
            // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged(Editable s) {
            //Save text after typed it
            text[pos] = s.toString();

        }
    });

    holder.radio_group=(RadioGroup)row.findViewById(R.id.radio_group);

    row.setTag(holder);


}
else

{
    holder = (WeatherHolder)row.getTag();
}

    Question question = data[position];
    holder.txtquestion.setText(question.question);
    holder.radioYes.setChecked(true);
    holder.radioYes.setChecked(false);
    //Assign text
    holder.editResponse.setText(text[position]);
    return row;
}

Answer 2

你的getView（...）实现如何？

它应该是这样的：

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

    if(view == null)
        view = inflate(view, parent);

    MyObject obj = objects.get(position);
    if(obj != null)
        view = setUIControls(position, view, obj);

    return view;
}

您要么全新{{1}}，要么重复使用'旧'View。

Answer 3

首先使用ConvertView而不是VIEW 这是没用的，你用它们做了什么;

if(convertView == null){
convertView=inflater.inflate....



return convertView;

然后从viewHolderObject中删除final修饰符;

Question data[] = null;// what the hell? if you want an array....
Question[] data=null;

并让您的观看者共享

class YourClass..{
private WeatherHolder holder;

以及converView==null

时

if(convertView==null){
....
holder=new WeatherHolder();

ListView中的重复项

3 个答案: