Custom adapters and check boxes in android listview

Custom adapters and check boxes in android listview

The following code reports an error. The Code is as follows:

@Overrideppublic View getView(final int position, final View convertView, final ViewGroup parent) {      final ViewHolder viewHolder;      View view = convertView;      if (view == null) {          view = LayoutInflater.from(mContext).inflate(R.layout.row, parent, false);          viewHolder = new ViewHolder();           viewHolder.textTitle = (TextView) view.findViewById(R.id.title);          viewHolder.checkBox = (CheckBox) view.findViewById(R.id.checkBox);           viewHolder.checkBox.setTag(position);          view.setTag(viewHolder);           viewHolder.imageView = (ImageView) view.findViewById(R.id.activity_googlecards_card_imageview);      } else {          viewHolder = (ViewHolder) view.getTag();          viewHolder.checkBox.getTag(position);      }       viewHolder.textTitle.setText(getItem(position).getTitle());       viewHolder.checkBox.setChecked(myIntegerArrayList.contains(position));      viewHolder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {          @Override          public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {              if (isChecked) {                  myIntegerArrayList.add(position);              } else {                  myIntegerArrayList.remove((Object) position);              }          }      });       return view;}}    private static class ViewHolder {      TextView textTitle;      CheckBox checkBox;}}

The check box itself works normally. The position is correctly added to my ArrayList, but if (assuming that the project I selected is in position 1) I scroll the listview to the bottom and then roll back, the selection is canceled ....

 

Solution

 

Delete the code viewHolder. checkBox. setTag (position );
Put viewHolder. checkBox. getTag (); In onCheckedChanged. Follow the code below to modify

 

@Overridepublic View getView(final int position, final View convertView, final ViewGroup parent) {      final ViewHolder viewHolder;      View view = convertView;      if (view == null) {          view = LayoutInflater.from(mContext).inflate(R.layout.row, parent, false);          viewHolder = new ViewHolder();           viewHolder.textTitle = (TextView) view.findViewById(R.id.title);          viewHolder.checkBox = (CheckBox) view.findViewById(R.id.checkBox);            view.setTag(viewHolder);           viewHolder.imageView = (ImageView) view.findViewById(R.id.activity_googlecards_card_imageview);      } else {          viewHolder = (ViewHolder) view.getTag();          viewHolder.checkBox.getTag(position);      }      viewHolder.checkBox.setTag(position);       viewHolder.textTitle.setText(getItem(position).getTitle());       viewHolder.checkBox.setChecked(myIntegerArrayList.contains(position));      viewHolder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {          @Override          public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {              if (isChecked) {                  myIntegerArrayList.add(viewHolder.checkBox.getTag());              } else {                  myIntegerArrayList.remove((Object) viewHolder.checkBox.getTag());              }          }      });       return view;}}

 

You can delete viewHolder. checkBox. setTag (position); to recycle the ListView, you need to report the error location in the tag and get the onCheckedChanged

The same is true for adding viewHolder. checkBox. getTag ().