ListView包含多个edittext字段

时间：2014-11-08 14:48:26

标签： android android-listview android-edittext textwatcher

我有一个基于RelatieLayout的ListView，有几个TextView和一个EditText。其中一个文本字段根据EditText字段中的值进行更新。

我的问题是在滚动listView时保留editText字段的值。我对BaseAdapter的扩展看起来像这样：

public class ListViewAdapter extends BaseAdapter {

static class ItemViewHolder {
    TextView
        itemName,
        itemPrize,
        itemTotalPrize,
    EditText
        itemAmount;
}   

static class CatViewHolder {
    TextView
        categoryName;
    Button
        categoryInfo;
}

ArrayList<ListItem> itemsList;
HashMap<Integer, String> volume = new HashMap<Integer, String>();

public ListViewAdapter(ArrayList<ListItem> itemsList) {
    this.itemsList = itemsList;
}   

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return this.itemList.size();
}

@Override
public ListItem getItem(int position) {
    // TODO Auto-generated method stub
    return this.itemList.get(position);
}

@Override
public long getItemId(int position) {
    // TODO Auto-generated method stub
    return 0;
}

@Override
public int getViewTypeCount() {
    return 2;
}

@Override
public int getItemViewType(int position) {
    if (getItem(position).isCategory()) return 0;
        else return 1;
}   

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View row = convertView;     
    if (!getItem(position).isCategory()) {
        String[] string;// = {"", ""};
        final Item item = (Item) getItem(position);
        if (row == null) {
            row = inflater.inflate(R.layout.item, parent, false);
            viewHolder = new ItemViewHolder();
            viewHolder.itemName = (TextView) row.findViewById(R.id.itemName);
            viewHolder.itemPrize = (TextView) row.findViewById(R.id.itemPrize);
            viewHolder.itemTotalPrize = (TextView) row.findViewById(R.id.itemTotalPrize);                
            viewHolder.itemAmount = (EditText) row.findViewById(R.id.itemAmount);
            row.setTag(viewHolder);
        }   else viewHolder = (DrugViewHolder) row.getTag();
        viewHolder.itemName.setText(item.getName());
        viewHolder.itemPrize.setText(String.valeuOf(item.getPrize()));
        viewHolder.itemAmount.addTextChangedListener(new AmountTextWatcher(item, position, row));
        viewHolder.itemAmount.setText(volume.get(item.getId)));
        viewHodler.itemTotalPrize.setText(String.valueOf(item.getPrize() * volume.get(item.getId));
    }   else {
            Category category = (Category) getItem(position);
            if (row == null) {
                row = inflater.inflate(R.layout.category, parent, false);
                catViewHolder = new CatViewHolder();
                catViewHolder.categoryName = (TextView) row.findViewById(R.id.categoryName);
                catViewHolder.categoryInfo = (Button) row.findViewById(R.id.categoryInfo);
                row.setTag(catViewHolder);
            }   else catViewHolder = (CatViewHolder) row.getTag();
            catViewHolder.categoryName.setText(category.getCatName());
        }
return row;     
}
@Override
public void AmountTextWatcher_interface(String amount, int position) {
    volume.put(position, amount);
}

编辑，添加了ListItem-structure

ListItem类，如下所示：

package com.buy.ng;
    public interface ListItem {
    public boolean isCategory();
}

我的两个对象，item和cateogory实现ListItem和isCategory（）在item和cateogry中都被覆盖。 Item返回false，类别返回true。

我的AmountTextWatcher看起来像这样：

class AmountTextWatcher implements TextWatcher {

public AmountTextWatcher_Interface textChangedListener = null;

interface AmountTextWatcher_Interface {
    public abstract void AmountTextWatcher_interface(String amount, int position);
}

private static final String TAG = "amountTextWatcher";

private TextView textView_TotalPrize,
private Item item;

public PrizeTextWatcher(Item item, int position, View row) {
    this.row = row;
    this.item = item;
    this.textView_TotalPrize = (TextView) row.findViewById(R.id.itemTotalPrize);
}

@Override       
public void afterTextChanged(Editable s) {
    String amount = s.toString().replace(",", ".").trim();
    int dummy;

    if (amount.length() == 0 || amount == null ) amount = "0";

    try {
        dummy = Integer.valueOf(amount);
    }   catch (NumberFormatException npe) {
            amount= "0";
            EditText editText = (EditText) view.findViewById(R.id.itemAmount);
            editText.setText("");
        }
    this.textView_prize.setText(Intege.valueOf(amount) * item.getPrize());
    textChangedListener.PrizeTextWatcher_interface(amount, item.getId());
}

public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}

public void onTextChanged(CharSequence s, int start, int before, int count) {
}
}

我尝试了几种方法，但是我无法获得要在ListView滚动上保留的EditText字段数量的值。

我试过HashMap amount = new HashMap（）;并使用在EditText，volume.put（item.getId（），amount）中输入的值填充它，但我似乎无法正确使用它。

尝试使用此PrizeTextWatcher的接口，该接口具有amount和item.getId（）作为变量。这个接口在ListViewAdapter中实现，它修改了这个适配器中的HashMap卷，如下所示：

@Override
public void AmountTextWatcher_interface(String amount, int id) {
    volume.put(id, amount);
}

任何建议或我这样做都错了吗？作为Android中的一个相对新手，我发现这很难实现......

2 个答案:

答案 0 :(得分：0)

更新此代码

@Override 
public long getItemId(int position) {
    // TODO Auto-generated method stub 
    return position; 
}

答案 1 :(得分：0)

选择使用这种ListView的某种有效工作版本来回答我自己的问题。有一些userexperience-问题，但这个BaseAdapter处理edittext-fields。

我的问题中的代码与我的答案中的代码之间的主要区别是什么？

三个ViewHolders

我想我可以从不需要editText字段的视图中删除EditText字段。错误。或至少它适用于三个ViewHolders。

<强> OnFocusChange

使用OnFocusChange而不是addTextChangedListener。直接从这里修改adpater-dataset，瞧！

<强> requestFocusFromTouch

viewHolder.itemAmount.requestFocusFromTouch（）;触摸时给出editText焦点。

在清单中，添加

android:windowSoftInputMode="adjustPan"

参加您的活动。

在XML-Listview中，添加

android:descendantFocusability="afterDescendants"

有些人认为＆＃34; beforeDescendants ＆＃34;应该在XML-ListView中使用。我的示例代码中没有任何改变。

adpater看起来像这样：

public class ListViewAdapter extends BaseAdapter {

static class ItemViewHolderEditText {
    TextView
        itemName,
        itemPrize,
        itemTotalPrize,
    EditText
        itemAmount;
}   

static class ItemViewHolder {
    TextView
        itemName,
        itemPrize,
        itemTotalPrize,
}   

static class CatViewHolder {
    TextView
        categoryName;
}

ArrayList<ListItem> itemsList;
Item item;

public ListViewAdapter(ArrayList<ListItem> itemsList) {
    this.itemsList = itemsList;
}   

@Override
public int getCount() {
    return this.itemsList.size();
}

@Override
public ListItem getItem(int position) {
    return this.itemsList.get(position);
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public int getViewTypeCount() {
    return 3;
}

@Override
public int getItemViewType(int position) {
    if (getItem(position).isCategory()) return 0;
        else {
            item = (Item) getItem(position);
            if (item.hasEditText()) return 1;
            return 2;
        }
}   

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View row = convertView;     
    if (!getItem(position).isCategory()) {
        item = (Item) getItem(position);
        if (item.hasEditText()) {
            if (row == null) {
                row = inflater.inflate(R.layout.item_edittext, parent, false);
                viewHolder = new ItemViewHolderEditText();
                viewHolder.itemName = (TextView) row.findViewById(R.id.itemName);
                viewHolder.itemPrize = (TextView) row.findViewById(R.id.itemPrize);
                viewHolder.itemTotalPrize = (TextView) row.findViewById(R.id.itemTotalPrize);                
                viewHolder.itemAmount = (EditText) row.findViewById(R.id.itemAmount);
                row.setTag(viewHolder);
            }   else viewHolder = (ItemViewHolderEditText) row.getTag();
            viewHolder.itemName.setText(item.getName());
            viewHolder.itemPrize.setText(String.valeuOf(item.getPrize()));
            viewHolder.itemAmount.setId(position);
            viewHolder.itemAmount.requestFocusFromTouch();
            viewHolder.itemAmount.selectAll();
            viewHolder.itemAmount.setOnFocusChangeListener(new OnFocusChangeListener() {
                public void onFocusChange(View v, boolean hasFocus) {
                    if (!hasFocus){
                        final EditText amount = (EditText) v;
                        Item item = (Item) itemsList.get(position);
                        item.setTotalPrize(Double.valueOf(amount.getText().toString().trim()));
                        itemsList.set(v.getId(), item);
                    }
                }
            });     
            viewHolder.itemAmount.setText(volume.get(item.getId)));
            viewHodler.itemTotalPrize.setText(String.valueOf(item.getPrize() * volume.get(item.getId));
        }   else {
                if (row == null) {
                    row = inflater.inflate(R.layout.item, parent, false);
                    viewHolder = new ItemViewHolder();
                    viewHolder.itemName = (TextView) row.findViewById(R.id.itemName);
                    viewHolder.itemPrize = (TextView) row.findViewById(R.id.itemPrize);
                    viewHolder.itemTotalPrize = (TextView) row.findViewById(R.id.itemTotalPrize);                
                    row.setTag(viewHolder);
                }   else viewHolder = (ItemViewHolder) row.getTag();
                viewHolder.itemName.setText(item.getName());
                viewHolder.itemPrize.setText(String.valeuOf(item.getPrize()));
                viewHodler.itemTotalPrize.setText(item.getTotalPrize());
            }
    }   else {
            Category category = (Category) getItem(position);
            if (row == null) {
                row = inflater.inflate(R.layout.category, parent, false);
                catViewHolder = new CatViewHolder();
                catViewHolder.categoryName = (TextView) row.findViewById(R.id.categoryName);
                catViewHolder.categoryInfo = (Button) row.findViewById(R.id.categoryInfo);
                row.setTag(catViewHolder);
            }   else catViewHolder = (CatViewHolder) row.getTag();
            catViewHolder.categoryName.setText(category.getCatName());
        }
    return row;     
}
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