当滚动自定义的ListView，该复选框值的变化自定义、复选框、ListView
我有什么：自定义列表视图与Textviews和复选框 问题：假设我的屏幕上可以显示时间列表中只有6项，其余是看不见的。 所以我检查（在位置0项）的列表中的第一个元素。我向下滚动到看到我所有的名单，当我滚动的第一个元素（项目位置0）复选框被选中正确。大！但现在有thath被检查过，比如该项目在8位（因为当我滚动列表（theRycicling）之成为在位置上的新项目0..remember我的屏幕上只显示7在时间单元）的新项目。它成为检查，但我从来没有检查它！ 问题：我怎么能避免这个问题？我不希望我不要点击改变其状态的复选框。 下面我适配器的ListView与getView功能，我已经实现了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;
}
}
谢谢你的答案:)
Thanks for the answers :)
编辑：随着建议，我改变了我的getView象下面这样：
@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;
}
状况后编辑：现在，如果我检查是在屏幕上显示，然后我双击自动滚屏列表中的初始项目，其价值是正确保存。但是当我滚动列表，例如我要检查的最后一棵树checkboxs我的名单再经过我滚动他们成为uncheked ....但为什么??????
解决：我解决了getView我的问题，这code：
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;
}
}
我已经看到了这个教程做我getView：的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
我解决我的问题只是改变了setOnCheckedChangeListener到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;
}
