在我的应用程序中，我添加checkbox ListView，我也限制checkbox，用户不能选择超过5 checkbox，但问题是滚动我选中的checkbox取消选中以下是我的代码段，任何人都可以帮我这个
public class CustomAdapter extends BaseAdapter {
private LayoutInflater inflater = null;
Context context;
String rup = "\u20B9";
private ArrayList<ModelPooja> listData;
boolean checked[];
public CustomAdapterPooja(Context mainActivity, ArrayList<ModelPooja> listData) {
// TODO Auto-generated constructor stub
context = mainActivity;
this.listData = listData;
inflater = (LayoutInflater) context.
getSystemService(Context.LAYOUT_INFLATER_SERVICE);
checked = new boolean[listData.size()];
for (int i = 0; i < checked.length; i++) {
checked[i] = listData.get(i).isselected;
}
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return listData.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
final ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.list_item_poojaselection, null);
holder.tv = (TextView) convertView.findViewById(R.id.list_item_poojaname);
holder.serviceprice = (TextView) convertView.findViewById(R.id.list_item_poojaprice);
holder.dayss = (TextView) convertView.findViewById(R.id.list_item_poojadays);
holder.txtseledates = (TextView) convertView.findViewById(R.id.selecteddatess);
holder.checks = (CheckBox) convertView.findViewById(R.id.list_item_poojacheck);
convertView.setTag(holder);
}else {
holder = (ViewHolder) convertView.getTag();
}
holder.checks.setOnCheckedChangeListener(null);
holder.checks.setFocusable(false);
holder.checks.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton cb, boolean b) {
if (checkMaxLimit()) {
if (listData.get(position).isselected && b) {
holder.checks.setChecked(false);
listData.get(position).isselected = false;
} else {
holder.checks.setChecked(false);
listData.get(position).isselected = false;
Toast.makeText(context, "Max limit reached", Toast.LENGTH_SHORT).show();
}
} else {
if (b) {
listData.get(position).isselected = true;
} else {
listData.get(position).isselected = false;
}
}
}
});
if (listData.get(position).isselected()) {
holder.checks.setChecked(true);
} else {
holder.checks.setChecked(false);
}
holder.tv.setText(listData.get(position).getPOOJA_LISTING_NAME());
holder.dayss.setText(listData.get(position).getPOOJA_LISTING_DAYS());
holder.serviceprice.setText(rup + listData.get(position).getPOOJA_LISTING_AMOUNT());
return convertView;
}
public boolean checkMaxLimit() {
int countermax = 0;
for (int i = 0; i < checked.length; i++) {
checked[i] = false;
checked[i] = listData.get(i).isselected();
if (listData.get(i).isselected()) {
countermax++;
}
}
return countermax >= 5 ? true : false;
}
public class ViewHolder {
TextView tv;
TextView serviceprice;
public CheckBox checks;
public TextView dayss;
public TextView txtseledates;
}
}
答案 0 :(得分：3)
问题出在你的getView（）方法中。您设置OnCheckedChangeListener，然后将checkbox设置为true或false，从而触发该侦听器中的回调。你应该首先设置复选框检查状态，然后设置OnCheckedChangeListener 。
另外，boolean checked []字段没用，所以我简化了你的代码：
public class CustomAdapter extends BaseAdapter {
private final LayoutInflater inflater;
private final Context context;
private List<ModelPooja> listData;
public CustomAdapter(Context mainActivity, List<ModelPooja> listData) {
context = mainActivity;
this.listData = listData;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return listData.size();
}
@Override
public Object getItem(int position) {
return listData.get(position);
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.list_item_poojaselection, null);
holder.tv = (TextView) convertView.findViewById(R.id.list_item_poojaname);
holder.checks = (CheckBox) convertView.findViewById(R.id.list_item_poojacheck);
convertView.setTag(holder);
}else {
holder = (ViewHolder) convertView.getTag();
}
holder.checks.setOnCheckedChangeListener(null);
holder.checks.setFocusable(false);
if (listData.get(position).isselected) {
holder.checks.setChecked(true);
} else {
holder.checks.setChecked(false);
}
holder.checks.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton cb, boolean b) {
if (checkMaxLimit()) {
if (listData.get(position).isselected && b) {
holder.checks.setChecked(false);
listData.get(position).isselected = false;
} else {
holder.checks.setChecked(false);
listData.get(position).isselected = false;
Toast.makeText(context, "Max limit reached", Toast.LENGTH_SHORT).show();
}
} else {
if (b) {
listData.get(position).isselected = true;
} else {
listData.get(position).isselected = false;
}
}
}
});
holder.tv.setText(listData.get(position).getPOOJA_LISTING_NAME());
return convertView;
}
public boolean checkMaxLimit() {
int countermax = 0;
for(ModelPooja item : listData){
if(item.isselected){
countermax++;
}
}
return countermax >= 5;
}
public class ViewHolder {
TextView tv;
public CheckBox checks;
}
}
答案 1 :(得分：1)
最初在adapter中使用false值创建一个布尔数组。如果用户检查数组，则make数组的位置为true。取消选中后将其设为false。始终从该布尔数组中设置复选框值。
答案 2 :(得分：0)
这是因为当您从手机的上方或下方滚动列表视图时，会重新生成列表视图的所有项目并将它们设置为默认值。 要避免这种情况，请创建一个模型类，它保存checkbox的当前值（true或false），并通过从该模型实例调用getter方法设置适配器中checkbox的值。 例如：
model.java
public class AddressModel {
private boolean isChecked;
private String address;
private int alAddressDelete;
public AddressModel(){
}
public AddressModel(boolean isChecked, String address, int alAddressDelete) {
this.isChecked = isChecked;
this.address = address;
this.alAddressDelete = alAddressDelete;
}
public boolean getIsChecked() {
return isChecked;
}
public void setIsChecked(boolean isChecked) {
this.isChecked = isChecked;
}
}
在您的Adapter类中，通过调用setIsChecked(boolean isChecked)中的setOnCheckedChangeListener()来设置复选框的值。
致电getIsChecked()，在其中设置复选框的价值。
答案 3 :(得分：0)
首先调用something，然后调用setOnCheckedChangeListener()，否则setChecked()将触发上一个ViewHolder对象的setChecked()。