标签：android-checkbox android listview baseadapter
在我的应用程序中我添加了ListView复选框,我也给了复选框的限制,用户不能选择超过5复选框,但问题是滚动我选中的复选框取消选中以下是我的代码片段,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;
}
}
解决方法:
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.您应首先设置复选框检查状态,然后设置OnCheckedChangeListener.
此外,布尔检查[]字段是无用的,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;
}
}
标签：android-checkbox,android,listview,baseadapter 来源： https://codeday.me/bug/20190925/1816813.html
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