I have the following code in my adapter. Each item consists of two images, and under them a checkbox for each image. I want to display a list of these items, but when I scroll up and down it seems like the first and last items are the same. And then after a while the other items would be out of order as well. I've looked at other questions regarding this issue and I have not been able to find why my ListView items are shuffling after I scroll down and up.
@Override
public View getView(final int position, View convertView, ViewGroup parent){
View view = convertView;
if(view == null){
viewHolder = new ViewHolder();
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.wheel_list_item, null);
viewHolder.decisionNum = (TextView)view.findViewById(R.id.decisionNumText);
viewHolder.leftWheel = (ImageView)view.findViewById(R.id.leftWheel);
viewHolder.rightWheel = (ImageView)view.findViewById(R.id.rightWheel);
viewHolder.leftCheckBox = (CheckBox)view.findViewById(R.id.leftCheckBox);
viewHolder.rightCheckBox = (CheckBox)view.findViewById(R.id.rightCheckBox);
viewHolder.wheelTuple = list.get(position);
view.setTag(viewHolder);
}
else{
viewHolder = (ViewHolder)view.getTag();
}
viewHolder.decisionNum.setText(Integer.toString(position + 1));
viewHolder.leftCheckBox.setClickable(false);
viewHolder.rightCheckBox.setClickable(false);
viewHolder.leftWheel.setImageBitmap(new WheelView(context, viewHolder.wheelTuple.left).getBitmapReduced());
viewHolder.rightWheel.setImageBitmap(new WheelView(context, viewHolder.wheelTuple.right).getBitmapReduced());
int id = context.getResources().getIdentifier("GREY", "color", context.getPackageName());
int colorId=context.getResources().getColor(id);
if(!viewHolder.wheelTuple.left.isChosen()){
viewHolder.leftWheel.setColorFilter(colorId, PorterDuff.Mode.MULTIPLY);
viewHolder.rightCheckBox.setChecked(true);
}
else{
viewHolder.rightWheel.setColorFilter(colorId, PorterDuff.Mode.MULTIPLY);
viewHolder.leftCheckBox.setChecked(true);
}
return view;
}
static class ViewHolder{
TextView decisionNum;
ImageView leftWheel;
ImageView rightWheel;
CheckBox leftCheckBox;
CheckBox rightCheckBox;
WheelListActivity.WheelTuple wheelTuple;
}
You have to use below two functions,
@Override
public int getViewTypeCount() {
if(searchList.size()==0){
return 1;
}
return searchList.size();
}
@Override
public int getItemViewType(int position) {
return position;
}
And if your dataArrayList is having size 0, then remember to return 1 from getViewTypeCount(),Otherwise you will get ArrayIndexOutOfBoundsException. Refer the above code example.
try and use code:
Addiding getview() in boolean array
if (mCheckedState[position])
viewHolder.leftCheckBox.setChecked(true);
else
viewHolder.leftCheckBox.setChecked(false);
if (mCheckedState[position])
viewHolder.rightCheckBox.setChecked(true);
else
viewHolder.rightCheckBox.setChecked(false);
Declare variable and set length:
boolean[] mCheckedState;
public class Adapter_Sandesh extends BaseAdapter {
Context context;
boolean[] mCheckedState;
private LayoutInflater mInflater;
public Adapter_Sandesh(FragmentActivity activity, String[] list_margdarshan) {
context=activity;
mCheckedState = new boolean[<your length>];
}
...
...
...
@Override
public View getView(final int position, View convertView, ViewGroup parent){
View view = convertView;
if(view == null){
viewHolder = new ViewHolder();
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.wheel_list_item, null);
viewHolder.decisionNum = (TextView)view.findViewById(R.id.decisionNumText);
viewHolder.leftWheel = (ImageView)view.findViewById(R.id.leftWheel);
viewHolder.rightWheel = (ImageView)view.findViewById(R.id.rightWheel);
viewHolder.leftCheckBox = (CheckBox)view.findViewById(R.id.leftCheckBox);
viewHolder.rightCheckBox = (CheckBox)view.findViewById(R.id.rightCheckBox);
viewHolder.wheelTuple = list.get(position);
view.setTag(viewHolder);
}
else{
viewHolder = (ViewHolder)view.getTag();
}
viewHolder.decisionNum.setText(Integer.toString(position + 1));
viewHolder.leftCheckBox.setClickable(false);
viewHolder.rightCheckBox.setClickable(false);
if (mCheckedState[position])
viewHolder.leftCheckBox.setChecked(true);
else
viewHolder.leftCheckBox.setChecked(false);
if (mCheckedState[position])
viewHolder.rightCheckBox.setChecked(true);
else
viewHolder.rightCheckBox.setChecked(false);
viewHolder.leftWheel.setImageBitmap(new WheelView(context, viewHolder.wheelTuple.left).getBitmapReduced());
viewHolder.rightWheel.setImageBitmap(new WheelView(context, viewHolder.wheelTuple.right).getBitmapReduced());
int id = context.getResources().getIdentifier("GREY", "color", context.getPackageName());
int colorId=context.getResources().getColor(id);
if(!viewHolder.wheelTuple.left.isChosen()){
viewHolder.leftWheel.setColorFilter(colorId, PorterDuff.Mode.MULTIPLY);
viewHolder.rightCheckBox.setChecked(true);
}
else{
viewHolder.rightWheel.setColorFilter(colorId, PorterDuff.Mode.MULTIPLY);
viewHolder.leftCheckBox.setChecked(true);
}
return view;
}
static class ViewHolder{
TextView decisionNum;
ImageView leftWheel;
ImageView rightWheel;
CheckBox leftCheckBox;
CheckBox rightCheckBox;
WheelListActivity.WheelTuple wheelTuple;
}
}
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