我是Android和Java編程新手,最近遇到問題。我一直在尋找答案几個小時,但我沒有成功。 我有一個自定義的ListView和一個自定義的適配器,包含一個CheckBox和一個EditText的行。每當它第一次顯示時,它都可以,但是當我向下滾動時,它開始更改CheckBox和EditText的值。Android:帶有ViewHolder,OnCheckedChangedListener和TextChangedListener的自定義適配器
這裏是我的row_edit.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<EditText
android:id="@+id/bonus"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:inputType="numberSigned"
android:gravity="right"
android:selectAllOnFocus="true"
android:textSize="16sp" />
<CheckBox
android:id="@+id/checkBox_person"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_toLeftOf="@id/bonus"
android:textSize="16sp" />
</RelativeLayout>
Item_edit(適配器的項目):
public class Item_edit {
private String meno;
private boolean ucast;
private int bonus;
public Item_edit(String meno, boolean ucast, int bonus) {
super();
this.meno = meno;
this.ucast = ucast;
this.bonus = bonus;
}
public String getMeno() {
return meno;
}
public boolean getUcast() {
return ucast;
}
public int getBonus() {
return bonus;
}
public void setMeno(String meno) {
this.meno = meno;
}
public void setUcast(boolean ucast) {
this.ucast = ucast;
}
public void setBonus(int bonus) {
this.bonus = bonus;
}
}
ListView控件並不順利,當我被滾動,這就是爲什麼我決定使用ViewHolder。 Adapter_edit:
public class Adapter_edit extends ArrayAdapter<Item_edit> {
private final Context context;
private final ArrayList<Item_edit> itemsArrayList;
private final Edit edit;
public Adapter_edit(Context context, ArrayList<Item_edit> itemsArrayList, Edit edit) {
super(context, R.layout.row_edit, itemsArrayList);
this.edit = edit;
this.context = context;
this.itemsArrayList = itemsArrayList;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.row_edit, parent, false);
holder = new ViewHolder();
//Log.e("NewHolder", "position = " + position);
holder.checkBox = (CheckBox) convertView
.findViewById(R.id.checkBox_person);
holder.bonus = (EditText) convertView.findViewById(R.id.bonus);
convertView.setTag(holder);
holder.checkBox.setText(itemsArrayList.get(position).getMeno());
holder.checkBox.setChecked(itemsArrayList.get(position).getUcast());
holder.bonus.setText(Integer.toString(itemsArrayList.get(position)
.getBonus()));
holder.checkBox
.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
itemsArrayList.get(position).setUcast(isChecked);
}
});
holder.bonus.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
try {
if (itemsArrayList.get(position).getBonus() != Integer
.parseInt(s.toString()) && !edit
.getUcast(position)) {
itemsArrayList.get(position).setBonus(
Integer.parseInt(s.toString()));
itemsArrayList.get(position).setUcast(true);
}
}
catch (NumberFormatException e) {
itemsArrayList.get(position).setBonus(0);
}
}
@Override
public void afterTextChanged(Editable s) {
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
});
}
else {
holder = (ViewHolder) convertView.getTag();
}
holder.checkBox.setText(itemsArrayList.get(position).getMeno());
holder.checkBox.setChecked(itemsArrayList.get(position).getUcast());
holder.bonus.setText(Integer.toString(itemsArrayList.get(position)
.getBonus()));
return convertView;
}
static class ViewHolder {
CheckBox checkBox;
EditText bonus;
}
}
與logcat的調試後,我知道,只有8所產生持有人(因爲有適合我的屏幕(0-7)項)。當我向下滾動時,這些正在被重用。沒有爲位置大於7的項目創建OnCheckedChangeListeners和TextChangedListeners。
我不知道該怎麼做。有人能幫我嗎?