在Android的listview中滚动或添加和项时，按钮文本消失

我使用的列表视图有问题。listview中的每个项目都有两个按钮，用户可以使用它们添加或删除每个参赛者的分数

问题是当我向列表视图添加一个新项目时，或者当滚动（在添加了至少一个项目后）时，代码会随机从一个或多个项目的按钮中取出文本

有谁能告诉我A）这是什么原因造成的？（B）如何解决

我已经包含了我认为相关的代码。如果你认为我需要在这里多放一些，请告诉我

我的适配器类：

public class ContestantListAdapter extends BaseAdapter {
private ArrayList<ContestantItem> contestantList;
private LayoutInflater  layoutInflater;

public ContestantListAdapter(Context context, ArrayList<ContestantItem> contestantList){
    this.contestantList = contestantList;
    layoutInflater = LayoutInflater.from(context);
}
@Override
public int getCount(){
    return contestantList.size();
}
public View getView(int position, View convertView, ViewGroup parentView){
    ViewHolder viewHolder;
    if(convertView == null){
        convertView = layoutInflater.inflate(R.layout.contestant_row_layout,null);//null might need to be activity_main
        viewHolder = new ViewHolder();
        viewHolder.nameView = (TextView) convertView.findViewById(R.id.nameView);
        viewHolder.pointsView = (TextView) convertView.findViewById(R.id.pointsView);
        convertView.setTag(viewHolder);
    }else{
        viewHolder = (ViewHolder)convertView.getTag();
    }
    viewHolder.nameView.setText((contestantList.get(position).getName()));
    viewHolder.pointsView.setText(Integer.toString(contestantList.get(position).getPoints()));

    //get button position
    Button button =(Button) convertView.findViewById(R.id.Minus);
    button.setOnClickListener(minusListener);
    Button buttonPlus = (Button) convertView.findViewById(R.id.Plus);
    buttonPlus.setOnClickListener(addListener);
    return convertView;
}

private View.OnClickListener minusListener = new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        View parentRow = (View) v.getParent();
        ListView listView = (ListView) parentRow.getParent();
        final int position = listView.getPositionForView(parentRow);
        ContestantItem tmpContestant = (ContestantItem) contestantList.get(position);
        int tmpPoints = tmpContestant.getPoints()-1;
        if(tmpPoints<0){tmpPoints=0;}
        tmpContestant.setPoints(tmpPoints);
        notifyDataSetChanged();
    }
};
private View.OnClickListener addListener = new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        View parentRow = (View) v.getParent();
        ListView listView = (ListView) parentRow.getParent();
        final int position = listView.getPositionForView(parentRow);
        ContestantItem tmpContestant = (ContestantItem) contestantList.get(position);
        int tmpPoints = tmpContestant.getPoints()+1;
        tmpContestant.setPoints(tmpPoints);
        notifyDataSetChanged();
    }
};
static class ViewHolder {
    TextView nameView;
    TextView pointsView;
}
@Override
public Object getItem(int index){
    return contestantList.get(index);
}
@Override
public long getItemId(int index){
    return index;
}

//this method should add the contestent to the listView.  must know what position to add it in.
public void addItem(String name, int index){
    ContestantItem tempContestant = new ContestantItem();
    tempContestant.setName(name);
    tempContestant.setPoints(1);
    contestantList.add(index,tempContestant);
    notifyDataSetChanged();
}
. . .

公共类ListAdapter扩展了BaseAdapter{
私人阵列列表；
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公共竞争者列表适配器（上下文上下文，ArrayList竞争者列表）{
this.qualitivelist=qualitivelist；
layoutInflater=layoutInflater.from（上下文）；
}
@凌驾
public int getCount（）{
返回列表。size（）；
}
公共视图getView（int位置、视图转换视图、视图组父视图）{
持票人持票人；
if（convertView==null）{
convertView=LayoutFlater.inflate（R.layout.Competitor_row_layout，null）；//null可能需要是活动主
viewHolder=新的viewHolder（）；
viewHolder.nameView=（TextView）convertView.findViewById（R.id.nameView）；
viewHolder.pointsView=（TextView）convertView.findViewById（R.id.pointsView）；
convertView.setTag（viewHolder）；
}否则{
viewHolder=（viewHolder）convertView.getTag（）；
}
viewHolder.nameView.setText（（竞争者列表.get（位置）.getName（））；
viewHolder.pointsView.setText（Integer.toString（竞争者列表.get（位置）.getPoints（））；
//获取按钮位置
Button Button=（Button）convertView.findViewById（R.id.减号）；
setOnClickListener（minusListener）；
Button buttonPlus=（Button）convertView.findViewById（R.id.Plus）；
buttonPlus.setOnClickListener（addListener）；
返回视图；
}
private View.OnClickListener minusListener=新视图。OnClickListener（）{
@凌驾
公共void onClick（视图v）{
View parentRow=（View）v.getParent（）；
ListView ListView=（ListView）parentRow.getParent（）；
最终int位置=listView.getPositionForView（父行）；
竞争者项tmpContestant=（竞争者项）竞争者列表。获取（位置）；
int tmpPoints=tmpContestant.getPoints（）-1；
如果（tmpPoints我要说的是@Suhas Bachewar说过的话，并将一些东西与您拥有的代码结合在一起，因为您应该知道，您正在使用一个回收器让您的视图填充列表中的不同对象，为什么不在getView中包含单击事件，这样您就不必急于查找哪个pa关节按钮视图与必须增加其值的对象相关联

public View getView(int position, View convertView, ViewGroup parentView){
    ViewHolder viewHolder;
    if(convertView == null){
        convertView = layoutInflater.inflate(R.layout.contestant_row_layout,null);//null might need to be activity_main
        viewHolder = new ViewHolder();
        viewHolder.nameView = (TextView) convertView.findViewById(R.id.nameView);
        viewHolder.buttonMinus= (Button) convertView.findViewById(R.id.Minus);
        viewHolder.buttonPlus= (Button) convertView.findViewById(R.id.Plus);
        viewHolder.pointsView = (TextView) convertView.findViewById(R.id.pointsView);
        convertView.setTag(viewHolder);
    }else{
        viewHolder = (ViewHolder)convertView.getTag();
    }
    viewHolder.nameView.setText((contestantList.get(position).getName()));
    viewHolder.pointsView.setText(Integer.toString(contestantList.get(position).getPoints()));

    //get button position

    buttonMinus.setOnClickListener(minusListener);

    buttonPlus.setOnClickListener(addListener);
    return convertView;
}

private View.OnClickListener minusListener = new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        View parentRow = (View) v.getParent();
        ListView listView = (ListView) parentRow.getParent();
        final int position = listView.getPositionForView(parentRow);
        ContestantItem tmpContestant = (ContestantItem) contestantList.get(position);
        int tmpPoints = tmpContestant.getPoints()-1;
        if(tmpPoints<0){tmpPoints=0;}
        tmpContestant.setPoints(tmpPoints);
        notifyDataSetChanged();
    }
};
private View.OnClickListener addListener = new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        View parentRow = (View) v.getParent();
        ListView listView = (ListView) parentRow.getParent();
        final int position = listView.getPositionForView(parentRow);
        ContestantItem tmpContestant = (ContestantItem) contestantList.get(position);
        int tmpPoints = tmpContestant.getPoints()+1;
        tmpContestant.setPoints(tmpPoints);
        notifyDataSetChanged();
    }
};
static class ViewHolder {
    TextView nameView;
    TextView pointsView;
    Button buttonMinus;
    Button buttonPlus;
}

公共视图getView（int位置、视图转换视图、视图组父视图）{
持票人持票人；
if（convertView==null）{
convertView=LayoutFlater.inflate（R.layout.Competitor_row_layout，null）；//null可能需要是活动主
viewHolder=新的viewHolder（）；
viewHolder.nameView=（TextView）convertView.findViewById（R.id.nameView）；
viewHolder.buttonMinus=（按钮）convertView.findViewById（R.id.减号）；
viewHolder.buttonPlus=（Button）convertView.findViewById（R.id.Plus）；
viewHolder.pointsView=（TextView）convertView.findViewById（R.id.pointsView）；
convertView.setTag（viewHolder）；
}否则{
viewHolder=（viewHolder）convertView.getTag（）；
}
viewHolder.nameView.setText（（竞争者列表.get（位置）.getName（））；
viewHolder.pointsView.setText（Integer.toString（竞争者列表.get（位置）.getPoints（））；
//获取按钮位置
buttonMinus.setOnClickListener（minusListener）；
buttonPlus.setOnClickListener（addListener）；
返回视图；
}
private View.OnClickListener minusListener=新视图。OnClickListener（）{
@凌驾
公共void onClick（视图v）{
View parentRow=（View）v.getParent（）；
ListView ListView=（ListView）parentRow.getParent（）；
最终int位置=listView.getPositionForView（父行）；
竞争者项tmpContestant=（竞争者项）竞争者列表。获取（位置）；
int tmpPoints=tmpContestant.getPoints（）-1；
如果（tmppoint在视图保持架内添加按钮与文本视图相同。@SuhasBachewar，你是对的，与特定的文本视图没有关系，因为视图保持架无法分辨单击了哪个按钮。他必须在视图保持架中同时包含加号和减号按钮。谢谢，我将这些按钮添加到了视图保持架中，它仍然随机地将按钮变为空白。我甚至在getView方法中设置按钮文本，我也遇到了同样的问题。我使用的是一款非常便宜的手机。这可能是因为主线程上发生了太多事情造成的吗？所以你解决了还是没有解决？如果是，那么你能给我指路吗？我已经很久没有记住具体的实现细节了。这个问题是由我引起的我制作了一个普通的java对象来保存列表中每个项目的状态，然后在onBindViewHolder中更新了viewHolder
public class MainActivity extends AppCompatActivity implements                           ContestantsFragment.OnFragmentInteractionListener{

ListView listView1;
ContestantListAdapter contestantAdapter;

@Override
protected void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ArrayList<ContestantItem> rowDetails = getListData();

    listView1 = (ListView) findViewById(R.id.contactsListView);
    listView1.setAdapter(new ContestantListAdapter(this,rowDetails));
    contestantAdapter = (ContestantListAdapter) listView1.getAdapter();

}

private ArrayList getListData(){
    ArrayList<ContestantItem> contestantList = new ArrayList<ContestantItem>();
    ContestantItem cItem;
    for(int i=0;i<10;i++){
        cItem = new ContestantItem();
        cItem.setName("Danny Anderson");
        cItem.setPoints(5);
        contestantList.add(cItem);
    }
    return contestantList;
}

@Override
public void onFragmentInteraction(Uri uri) {

}
//if the name is found returns the index position in the list.  If not found -99
public void findAlphabetical(View view){
    //TODO implement Binary search algorithm.
    hideKeyboard();
    EditText tmpEditTxt = (EditText) findViewById(R.id.searchField);
    String inputTxt = tmpEditTxt.getText().toString();
    int findAtIndex =contestantAdapter.searchAlphabetical(inputTxt)-1;
    if(findAtIndex <0){findAtIndex=0;}
    listView1.smoothScrollToPosition(findAtIndex);
}
public void addInAlpabetOrder(View view){
    //TODO  add the name in alphabetical order
    hideKeyboard();
    //ListView tmpListView = (ListView) contestantsFragment.getView().findViewById(R.id.contactsListView);
    EditText tmpEditTxt = (EditText) findViewById(R.id.searchField);
    String inputTxt = tmpEditTxt.getText().toString();
    int addAtIndex =contestantAdapter.searchAlphabetical(inputTxt);
    contestantAdapter.addItem(inputTxt, addAtIndex);
    listView1.smoothScrollToPosition(addAtIndex);
}
public void clearContestantList(View view){
    //TODO clear out all contestants from the list
    contestantAdapter.clearAllItems();

}
. . .

public View getView(int position, View convertView, ViewGroup parentView){
    ViewHolder viewHolder;
    if(convertView == null){
        convertView = layoutInflater.inflate(R.layout.contestant_row_layout,null);//null might need to be activity_main
        viewHolder = new ViewHolder();
        viewHolder.nameView = (TextView) convertView.findViewById(R.id.nameView);
        viewHolder.buttonMinus= (Button) convertView.findViewById(R.id.Minus);
        viewHolder.buttonPlus= (Button) convertView.findViewById(R.id.Plus);
        viewHolder.pointsView = (TextView) convertView.findViewById(R.id.pointsView);
        convertView.setTag(viewHolder);
    }else{
        viewHolder = (ViewHolder)convertView.getTag();
    }
    viewHolder.nameView.setText((contestantList.get(position).getName()));
    viewHolder.pointsView.setText(Integer.toString(contestantList.get(position).getPoints()));

    //get button position

    buttonMinus.setOnClickListener(minusListener);

    buttonPlus.setOnClickListener(addListener);
    return convertView;
}

private View.OnClickListener minusListener = new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        View parentRow = (View) v.getParent();
        ListView listView = (ListView) parentRow.getParent();
        final int position = listView.getPositionForView(parentRow);
        ContestantItem tmpContestant = (ContestantItem) contestantList.get(position);
        int tmpPoints = tmpContestant.getPoints()-1;
        if(tmpPoints<0){tmpPoints=0;}
        tmpContestant.setPoints(tmpPoints);
        notifyDataSetChanged();
    }
};
private View.OnClickListener addListener = new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        View parentRow = (View) v.getParent();
        ListView listView = (ListView) parentRow.getParent();
        final int position = listView.getPositionForView(parentRow);
        ContestantItem tmpContestant = (ContestantItem) contestantList.get(position);
        int tmpPoints = tmpContestant.getPoints()+1;
        tmpContestant.setPoints(tmpPoints);
        notifyDataSetChanged();
    }
};
static class ViewHolder {
    TextView nameView;
    TextView pointsView;
    Button buttonMinus;
    Button buttonPlus;
}