如何使EditText值在可滾動列表視圖中持久

我有一個listview由TextView，EditText和Checkbox組成。我想讓edittext的狀態保持不變，當我在edittext中更改文本，然後向上或向下滾動列表視圖時，添加/寫入到edittext中的文本不應該更改，並且必須保留因爲它是如何使EditText值在可滾動列表視圖中持久

我設法使複選框持久化，我不知道如何使edittext狀態持久。

請看看在getView（）methos它下面貼並請讓我知道如何解決這個問題

getView

@Override 
public View getView(final int position, View convertView, ViewGroup parent) { 
    // TODO Auto-generated method stub 

    View view = null; 

    if (convertView == null) { 
     LayoutInflater layoutinflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE); 
     view = layoutinflater.inflate(R.layout.model, null); 

     final ViewHolder holder = new ViewHolder(); 

     holder.tv = (TextView) view.findViewById(R.id.tv); 
     holder.cb = (CheckBox) view.findViewById(R.id.cb); 
     holder.et = (EditText) view.findViewById(R.id.et); 

     holder.cb.setOnCheckedChangeListener(new OnCheckedChangeListener() { 

      @Override 
      public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 
       // TODO Auto-generated method stub 

       ItemDesign element = (ItemDesign) holder.cb.getTag(); 
       element.setChecked(buttonView.isChecked()); 
      } 
     }); 

     view.setTag(holder); 

     holder.cb.setTag(designList.get(position));//checkbox 

     //edittext 
     ItemDesign element = (ItemDesign) holder.et.getTag(); 
     if (element != null) { 
      element.setEtTxt(holder.et.getText().toString()); 
     } 
     holder.et.setTag(designList.get(position)); 

     holder.tv.setTag(designList.get(position));//textview 

    } else { 
     view = convertView; 

     ((ViewHolder)view.getTag()).et.setTag(designList.get(position));//edittext 
     ((ViewHolder)view.getTag()).tv.setTag(designList.get(position));//textview 
     ((ViewHolder)view.getTag()).cb.setTag(designList.get(position));//checkbox 
    } 
    ViewHolder holder = (ViewHolder) view.getTag(); 

    holder.tv.setText(designList.get(position).getTxt()); //textview 
    holder.cb.setChecked(designList.get(position).isChecked());//checkbox 

    //edittext 
    String etTxt = holder.et.getText().toString(); 
    designList.get(position).setEtTxt(etTxt); 
    holder.et.setText(designList.get(position).getEtTxt()); 

    return view; 
} 
private class ViewHolder { 
    TextView tv; 
    CheckBox cb; 
    EditText et; 
}

來源

2017-02-12 user2121

您必須在designList數組中維護值。並在getView方法，你必須檢查和settext或setchecked ... –

@SamirMangroliya好的，在我的designList中有每個視圖「TextView，Checkbox，Edittext」的getter和setter，我在getView中使用這些getter和setter上面，我設法使複選框持久......但我的問題是，如何使Edittext值持久 – user2121

您應該添加TextWatcher到您的編輯文本並使用它來跟蹤輸入到textview的文本。

holder.et.setTag(designList.get(position));//edittext  
holder.et.addTextChangedListener(new TextWatcher() { 

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

     } 

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

     } 

     @Override 
     public void afterTextChanged(Editable s) { 
      ItemDesign element = (ItemDesign) holder.cb.getTag(); 
      element.setEditTextValue(s.toString()) 
     }

來源

2017-02-12 14:43:24 Saurabh

如果我理解正確的話，你需要在你的EditText註冊TextWatcher，每次保存字符串值，當你向它更改文本。所以，你需要從更新你的代碼部分：

String etTxt = holder.et.getText().toString(); designList.get(position).setEtTxt(etTxt); holder.et.setText(designList.get(position).getEtTxt());

到（對不起，我不知道你有沒有在designList什麼時間元素，但希望這是，例如，鍵入Item，你可以過去你的類型，而不是它）：

final Item designItem = designList.get(position); holder.et.setText(designItem.getEtTxt()); holder.et.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {} @Override public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {} @Override public void afterTextChanged(Editable editable) { designItem.setEtTxt(editable.toString); } });

但要小心。此解決方案尚未運行，因爲您已註冊新的和新的觀察者，但不清除舊的。在這種情況下，我沒有完美的解決方案，因爲EditText沒有像clearTextChangedListeners()這樣的東西。但是你可以介紹自己的EditText（copied from here）解決它：

public class ExtendedEditText extends EditText { private ArrayList<TextWatcher> mListeners = null; public ExtendedEditText(Context ctx) { super(ctx); } public ExtendedEditText(Context ctx, AttributeSet attrs) { super(ctx, attrs); } public ExtendedEditText(Context ctx, AttributeSet attrs, int defStyle) { super(ctx, attrs, defStyle); } @Override public void addTextChangedListener(TextWatcher watcher) { if (mListeners == null) { mListeners = new ArrayList<TextWatcher>(); } mListeners.add(watcher); super.addTextChangedListener(watcher); } @Override public void removeTextChangedListener(TextWatcher watcher) { if (mListeners != null) { int i = mListeners.indexOf(watcher); if (i >= 0) { mListeners.remove(i); } } super.removeTextChangedListener(watcher); } public void clearTextChangedListeners() { if (mListeners != null) { for (TextWatcher watcher : mListeners) { super.removeTextChangedListener(watcher); } mListeners.clear(); mListeners = null; } } }

是最終的解決方案後看起來就像這樣：

final Item designItem = designList.get(position); holder.et.clearTextChangedListeners(); holder.et.setText(designItem.getEtTxt()); holder.et.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {} @Override public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {} @Override public void afterTextChanged(Editable editable) { designItem.setEtTxt(editable.toString); } });

凡et將ExtendedEditText而不是EditText類型。

來源

2017-02-12 14:53:29

如何使EditText值在可滾動列表視圖中持久

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