当滚动自定义ListView时，复选框值更改 [英] When scrolling custom ListView, the checkbox value changes
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问题描述
我有：一个自定义列表视图，其中包含Textviews和复选框。
问题：在时间上只显示6项列表，而其他是不可见的。
所以我检查了列表中的第一个元素（位置0的项目）。我向下滚动查看我的所有列表，当我向上滚动第一个元素（位置0项）复选框被正确选中。大！但现在有新的项目也被检查，例如在位置8的项目（因为当我滚动列表（为Ricicling）它成为位置0..remember的新项目。我的屏幕只显示7个元素在时间）。它被检查，但我从来没有检查过！
问题：我该如何避免这个问题？我不想要的复选框，我不点击改变他们的状态。
下面我的适配器的listView与getView函数，我实现了setOnCheckedChangeListener：
What I have: a custom listview with Textviews and checkbox.
Problem: Suppose my screen can show only 6 items of list at time, and the others are invisible. So I checked the first element on the list (item at position 0). I scroll down to see all my list, when I scroll up at first element (item at position 0) the checkbox is checked correctly. Great! But now there are new items thath are checked too, for example the item at position 8 (because when I scroll the list (for theRycicling) it become the new item at position 0..remember my screen shows only 7 elements at time). And it become checked, but i have never checked it!
Question: How i can avoid this problem? I don't want that the checkbox that I don't click change their status.
Below my adapter for listView with the getView function where I have implemented the setOnCheckedChangeListener:
public class NewQAAdapterSelectFriends extends BaseAdapter {
private LayoutInflater mInflater;
private Person[] data;
public NewQAAdapterSelectFriends(Context context) {
mInflater = LayoutInflater.from(context);
}
public void setData(Person[] data) {
this.data = data;
}
@Override
public int getCount() {
return data.length;
}
@Override
public Object getItem(int item) {
return data[item];
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = mInflater.inflate(R.layout.item_select_friends, null);
final ViewHolder viewHolder = new ViewHolder();
viewHolder.nameText=(TextView) convertView.findViewById(R.id.personName);
viewHolder.surnameText=(TextView) convertView.findViewById(R.id.personSurname);
viewHolder.contactImage=(ImageView) convertView.findViewById(R.id.personImage);
viewHolder.checkBox=(CheckBox)convertView.findViewById(R.id.checkBox);
convertView.setTag(viewHolder);
viewHolder.nameText.setTag(viewHolder.nameText);
viewHolder.nameText.setTag(viewHolder.surnameText);
viewHolder.contactImage.setTag(data[position]);
viewHolder.checkBox.setOnCheckedChangeListener(
new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
Person element = (Person) viewHolder.checkBox.getTag();
if(isChecked){
element.setCheck(buttonView.isChecked());
//data[position].setCheck(true); //this is equivalent to previous line
}
else{
//to-do
}
}
});
viewHolder.checkBox.setTag(data[position]);
} else {
}
ViewHolder holder = (ViewHolder) convertView.getTag();
holder.nameText.setText(data[position].getName());
holder.surnameText.setText(data[position].getSurname());
holder.contactImage.setImageResource(data[position].getPhotoRes());
holder.contactImage.setScaleType(ScaleType.FIT_XY);
holder.checkBox.setChecked(data[position].isCheck());
return convertView;
}
static class ViewHolder {
TextView nameText;
TextView surnameText;
ImageView contactImage;
CheckBox checkBox;
}
}
感谢您的答案:)
Thanks for the answers :)
编辑：与建议我改变我的getView如下：
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder viewHolder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.item_select_friends, null);
viewHolder=new ViewHolder();
viewHolder.nameText=(TextView) convertView.findViewById(R.id.personName);
viewHolder.surnameText=(TextView) convertView.findViewById(R.id.personSurname);
viewHolder.contactImage=(ImageView) convertView.findViewById(R.id.personImage);
viewHolder.checkBox=(CheckBox)convertView.findViewById(R.id.checkBox);
convertView.setTag(viewHolder);
viewHolder.nameText.setTag(viewHolder.nameText);
viewHolder.nameText.setTag(viewHolder.surnameText);
viewHolder.contactImage.setTag(data[position]);
viewHolder.checkBox.setChecked(data[position].isCheck());
viewHolder.checkBox.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
if(viewHolder.checkBox.isChecked()==true)
data[position].setCheck(true);
else
data[position].setCheck(false);
}
});
}
else{
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.nameText.setText(data[position].getName());
viewHolder.surnameText.setText(data[position].getSurname());
viewHolder.contactImage.setImageResource(data[position].getPhotoRes());
viewHolder.contactImage.setScaleType(ScaleType.FIT_XY);
viewHolder.checkBox.setChecked(data[position].isCheck());
return convertView;
}
编辑后的现状：在屏幕上显示，然后我scrool的列表，他们的值正确保存。但是当我滚动列表，例如我想检查我的列表的最后一个树复选框，然后我滚动他们成为uncheked ....但是为什么
已解决：我使用此代码解决了我的getView问题：
SOLVED: I solved my problem of getView with this code:
public class NewQAAdapterSelectFriends extends BaseAdapter {
private LayoutInflater mInflater;
private Person[] data;
boolean[] checkBoxState;
ViewHolder viewHolder;
public NewQAAdapterSelectFriends(Context context) {
mInflater = LayoutInflater.from(context);
}
public void setData(Person[] data) {
this.data = data;
checkBoxState=new boolean[data.length];
}
@Override
public int getCount() {
return data.length;
}
@Override
public Object getItem(int item) {
return data[item];
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = mInflater.inflate(R.layout.item_select_friends, null);
viewHolder=new ViewHolder();
viewHolder.nameText=(TextView) convertView.findViewById(R.id.personName);
viewHolder.surnameText=(TextView) convertView.findViewById(R.id.personSurname);
viewHolder.contactImage=(ImageView) convertView.findViewById(R.id.personImage);
viewHolder.checkBox=(CheckBox)convertView.findViewById(R.id.checkBox);
convertView.setTag(viewHolder);
}
else{
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.nameText.setText(data[position].getName());
viewHolder.surnameText.setText(data[position].getSurname());
viewHolder.contactImage.setImageResource(data[position].getPhotoRes());
viewHolder.contactImage.setScaleType(ScaleType.FIT_XY);
viewHolder.checkBox.setChecked(checkBoxState[position]);
viewHolder.checkBox.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if(((CheckBox)v).isChecked()){
checkBoxState[position]=true;
data[position].setCheck(true);
}else{
checkBoxState[position]=false;
data[position].setCheck(false);
}
}
});
return convertView;
}
static class ViewHolder {
TextView nameText;
TextView surnameText;
ImageView contactImage;
CheckBox checkBox;
}
}
我看到这个教程来做我的getView： http：// androidcocktail。 blogspot.it/2012/04/adding-checkboxes-to-custom-listview-in.html
I have seen this tutorial to do my getView: http://androidcocktail.blogspot.it/2012/04/adding-checkboxes-to-custom-listview-in.html
推荐答案
我解决了我的问题只是改变setOnCheckedChangeListener为setOnClickListener
I solved my problem just changing the "setOnCheckedChangeListener" to "setOnClickListener"
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
CheckBox cbItemChecklist = new CheckBox(context);
holder = new ViewHolder();
holder.cbItemChecklist = cbItemChecklist;
convertView = cbItemChecklist;
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
final ItemChecklist itemChecklist = itensChecklist.get(position);
holder.cbItemChecklist.setText(itemChecklist
.getDescricaoItemChecklist());
holder.cbItemChecklist.setChecked(itemChecklist.isChecked());
holder.cbItemChecklist
.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if(itemChecklist.isChecked()){
itemChecklist.setChecked(false);
} else {
itemChecklist.setChecked(true);
}
}
});
return convertView;
}
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