Android:EditText在ListView中滚动丢失内容？

Question

我有列表项目EditText,我不知道会有多少项目.我有一个问题,当我在输入一些文字EditText,然后向下滚动ListView,之后我已经向上滚动再次出现在我的第一个没有文字EditText,或有其他一些文本EditText的ListView.

我已经尝试过TextWatcher,并将数据保存到数组中,但问题是返回的视图位置ListView并不总是正确的,所以我从数组中丢失了一些数据.

请帮忙.

这是我的代码:

public class EfficientAdapter extends BaseAdapter {

    private LayoutInflater mInflater;
    public String[] Current;
    ArrayList<String> MeterName, PreviousReading, Current_Reading;
    JSONArray getArray_Meter_Reading;

    public EfficientAdapter(Context context, JSONArray getArray_Meter_Reading) {
        mInflater = LayoutInflater.from(context);
        this.getArray_Meter_Reading = getArray_Meter_Reading;
        MeterName = new ArrayList<String>();
        PreviousReading = new ArrayList<String>();
        for (int i = 0; i < getArray_Meter_Reading.length(); i++) {
            try {
                String Meter_Name = getArray_Meter_Reading.getJSONObject(i)
                        .getString("MeterName").toString();
                String previous_Meter_Reading = getArray_Meter_Reading
                        .getJSONObject(i).getString("PrevMeterReading")
                        .toString();
                MeterName.add(Meter_Name);
                PreviousReading.add(previous_Meter_Reading);

                // Meter[i]=MeterName.get(i);
                // Previous[i]=PreviousReading.get(i);
            } catch (JSONException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

    public int getCount() {

        return getArray_Meter_Reading.length();
    }

    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return position;
    }

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

    public View getView(int position, View convertView, ViewGroup parent) {
        final ViewHolder holder;

        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.meter_reading_list, null);
            holder = new ViewHolder();
            holder.adp_MeterName = (TextView) convertView
                    .findViewById(R.id.txt_Meter_Name);
            holder.adp_Previous = (TextView) convertView
                    .findViewById(R.id.txt_Previous);
            holder.adp_Current = (EditText) convertView
                    .findViewById(R.id.ed_Current);

            holder.adp_Current.addTextChangedListener(new TextWatcher() {

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

                }

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

                }

                public void afterTextChanged(Editable s) {

                    Current[holder.ref] = s.toString();

                }
            });
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.ref = position;
        holder.adp_MeterName.setText(MeterName.get(position));
        holder.adp_Previous.setText(PreviousReading.get(position));
        // holder.adp_Current.setHint(MeterName.get(position));

        // holder.adp_Current.setText(PreviousReading.get(position));

        return convertView;
    }

    class ViewHolder {
        TextView adp_MeterName, adp_Previous;
        EditText adp_Current;
        int ref;

    }

}

Answer 1

试试这个:

public class EfficientAdapter extends BaseAdapter {

private LayoutInflater mInflater;
public String[] Current;
ArrayList<String> MeterName, PreviousReading, Current_Reading;
JSONArray getArray_Meter_Reading;
public static HashMap<Integer,String> myList=new HashMap<Integer,String>();

public EfficientAdapter(Context context, JSONArray getArray_Meter_Reading) {
    mInflater = LayoutInflater.from(context);
    this.getArray_Meter_Reading = getArray_Meter_Reading;
    MeterName = new ArrayList<String>();
    PreviousReading = new ArrayList<String>();

    for (int i = 0; i < getArray_Meter_Reading.length(); i++) {
        try {
            String Meter_Name = getArray_Meter_Reading.getJSONObject(i)
                    .getString("MeterName").toString();
            String previous_Meter_Reading = getArray_Meter_Reading
                    .getJSONObject(i).getString("PrevMeterReading")
                    .toString();
            MeterName.add(Meter_Name);
            PreviousReading.add(previous_Meter_Reading);

            // Meter[i]=MeterName.get(i);
            // Previous[i]=PreviousReading.get(i);
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    // initialize myList
    for(int i=0;i<JSON_ARRAY_LENGTH;i++)
    {
       myList.put(i,"");
    }
}

public int getCount() {

    return getArray_Meter_Reading.length();
}

public Object getItem(int position) {
    // TODO Auto-generated method stub
    return position;
}

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

public View getView(int position, View convertView, ViewGroup parent) {
    final ViewHolder holder;
    final int pos=position;
    if (convertView == null) {
        convertView = mInflater.inflate(R.layout.meter_reading_list, null);
        holder = new ViewHolder();
        holder.adp_MeterName = (TextView) convertView
                .findViewById(R.id.txt_Meter_Name);
        holder.adp_Previous = (TextView) convertView
                .findViewById(R.id.txt_Previous);
        holder.adp_Current = (EditText) convertView
                .findViewById(R.id.ed_Current);


        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }
     holder.adp_Current.addTextChangedListener(new TextWatcher() {

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

            }

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

            }

            public void afterTextChanged(Editable s) {

                Current[holder.ref] = s.toString();
                myList.put(pos,s.toString.trim());
            }
        });
    holder.ref = position;
    holder.adp_MeterName.setText(MeterName.get(position));
    holder.adp_Previous.setText(PreviousReading.get(position));
    // holder.adp_Current.setHint(MeterName.get(position));

    // holder.adp_Current.setText(PreviousReading.get(position));

    holder.adp_Current.setText(myList.get(position));

    return convertView;
}

class ViewHolder {
    TextView adp_MeterName, adp_Previous;
    EditText adp_Current;
    int ref;

}

}

在这里,我已经包含了一个HashMap对象,它将关注EditText是否包含值.当您滚动列表视图时,它将通过调用其getView方法以及与每个edittext关联的文本再次呈现.

在这段代码中,当你第一次加载listview时,你所有的edittext都没有text.once你输入一些文本,它会在myList中注明.所以当你再次渲染列表时,你的文本就会被阻止.

还有一件事,你应该在外面实现textwatcher if(convertView == null).. else .. block.That是一个更好的做法!

Answer 2

我正在处理的项目遇到了完全相同的问题.我发现的所有解决方案也提到了使用textChangeListener,但由于列表的性质,并且EditText在每个行视图中,这是非常低效的.我采用了一个单独的方法EditText.setOnFocusChangeListener().

我将它附加到getView方法中的每个EditText.这种方法运行良好的原因是当用户切换到不同的编辑文本或滚动时调用它,因此当前行离开屏幕会导致EditText失去焦点.

在侦听器中的onFocusChange(View v,boolean hasFocus)中,我简单地说:

if (!hasFocus) {
                EditText et = (EditText) v.findViewById(R.id.groupAmount);                  
                data.get(position).put("dueAmount", et.getText().toString().trim());
            }

在我的示例中,我将输入的值存储到用于填充每个getView调用的视图的数据中,但这仍应显示如何访问用户输入的数据.只需确保您尝试获取此存储的数据并尝试在相应位置填充editText.

希望这可以帮助.

在此发布我的完整适配器以供参考

public class memberlistadapter extends BaseAdapter {
private LayoutInflater mInflater;
public ArrayList<Hashtable<String, String>> data;
ViewHolder viewHolder;
public static HashMap<Integer,String> myList=new HashMap<Integer,String>();

public memberlistadapter(Context context) {
    mInflater = LayoutInflater.from(context);
}

public memberlistadapter(Activity activity, ArrayList<Hashtable<String, String>> objects) {
    super();
    mInflater = activity.getLayoutInflater();
    //this.activity = activity;
    this.data = objects;
    Log.d("data", data.toString());
}

public void clear() {
    this.data.clear();
    viewHolder = null;
}

public void setData(ArrayList<Hashtable<String, String>> data) {
    this.data = data;
}

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

public Object getItem(int item) {
    return data.get(item);
}

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

public View getView(final int position, View convertView, ViewGroup parent) {
    if (convertView == null) {
        convertView = mInflater.inflate(R.layout.member_amount_child, null);
        viewHolder = new ViewHolder();

        viewHolder.nameText = (TextView) convertView.findViewById(R.id.grp_amt_child);
        viewHolder.amountText = (EditText) convertView.findViewById(R.id.groupAmount);
        viewHolder.checkBox = (CheckBox) convertView.findViewById(R.id.memberCheckNotif);

        convertView.setTag(viewHolder);

    } else {
        viewHolder = (ViewHolder) convertView.getTag();
    }
    //Log.d("data at "+position, data.get(position).toString());
    String amt = data.get(position).get("dueAmount");
    String name = data.get(position).get("name");
    String check = data.get(position).get("reminder");

    viewHolder.nameText.setText(name);
    try {
    if (amt.length() > 0 && !amt.equalsIgnoreCase("0")) {
        viewHolder.amountText.setText(amt);
    } else {
        viewHolder.amountText.setText("");
    }
    } catch (Exception e) {
        viewHolder.amountText.setText("");
    }

    viewHolder.amountText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        public void onFocusChange(View v, boolean hasFocus) {
            if (!hasFocus) {
                EditText et = (EditText) v.findViewById(R.id.groupAmount);
                data.get(position).put("dueAmount", et.getText().toString().trim());
            }
        }
    });

    try {
    if (check.equalsIgnoreCase("true")) {
        viewHolder.checkBox.setChecked(true);
    } else {
        viewHolder.checkBox.setChecked(false);
    }
    } catch (Exception e) {
        viewHolder.checkBox.setChecked(false);
    }
    viewHolder.checkBox.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            if (((CheckBox) v).isChecked()) {
                data.get(position).put("reminder", "True");
            } else {
                data.get(position).put("reminder", "False");
            }
        }
    });
    if (position == 0) {
        viewHolder.checkBox.setVisibility(View.GONE);
        viewHolder.amountText.setVisibility(View.GONE);
        viewHolder.nameText.setVisibility(View.GONE);
    } else {
        viewHolder.checkBox.setVisibility(View.VISIBLE);
        viewHolder.amountText.setVisibility(View.VISIBLE);
        viewHolder.nameText.setVisibility(View.VISIBLE);
    }

    return convertView;
}

static class ViewHolder {
    TextView nameText;
    EditText amountText;
    CheckBox checkBox;
}
}