滚动自定义ListView时，复选框值发生变化 [英] When scrolling custom ListView, the checkbox value changes
本文介绍了滚动自定义ListView时，复选框值发生变化的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有什么:带有文本视图和复选框的自定义列表视图.
问题: 假设我的屏幕一次只能显示 6 个列表项，而其他项是不可见的.所以我检查了列表中的第一个元素(位置 0 的项目).我向下滚动以查看我的所有列表，当我向上滚动第一个元素(位置 0 处的项目)时，复选框被正确选中.伟大的！但是现在也检查了新项目，例如位置 8 处的项目(因为当我滚动列表(对于 theRycicycling)时，它成为位置 0 处的新项目......记住我的屏幕一次只显示 7 个元素).它被检查了，但我从来没有检查过！
问题:我怎样才能避免这个问题?我不希望我不点击的复选框改变它们的状态.
在我实现 setOnCheckedChangeListener 的带有 getView 函数的 listView 适配器下方:
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;
}
}
感谢您的回答:)
Thanks for the answers :)
根据建议，我改变了我的 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;
}
编辑后的情况:现在，如果我检查屏幕上显示的初始项目，然后滚动列表，它们的值将正确保存.但是，当我滚动列表时，例如，我想检查列表的最后一个树复选框，然后在滚动后它们变得未选中....但是为什么??????
解决:我用这段代码解决了我的 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;
}
}
我看过这个教程来做我的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，只是将setOnCheckedChangeListener"更改为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;
}
这篇关于滚动自定义ListView时，复选框值发生变化的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
