如何将计数器值分配给可扩展列表视图按钮

Question

I have expandable list view and each one of view has button. I need to set a tag to each of the button like button1(count 0), button1(count 1), button1(count 2)....... I tried incrementing count each time but it is setting some random counter value.

I am suspecting that I am doing counter++ in wrong place please some one suggest me where I can increment the counter value.

Universally assigning counter:

int counter = 0;

In getChildView() method

 @Override
public View getChildView(final int i, final int i1, boolean b, View view, ViewGroup viewGroup) {
   if (view == null) {
        holder = new ViewHolder();
        LayoutInflater parentInflater = (LayoutInflater) mctx.getSystemService(mctx.LAYOUT_INFLATER_SERVICE);
        view = parentInflater.inflate(R.layout.itemname_child_layout, null);
        holder.button = view.findViewById(R.id.childrecordbtn);
 } else {
        holder = (ViewHolder) view.getTag();
 }

 holder.button.setTag(counter);

 holder.button..setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
          int tag = view.getTag();
          Log.i("Tag Value = ",tag);
        }
 }
 counter++;
 return view;
}

Above code returning some random values after button click.

Output :

Button1 : "Tag Value : 24"
Button2 : "Tag Value : 25"
Button3 : "Tag Value : 113"

Answer 1

Take a look at the definitation of getChildView() :

getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent)

That means in your code, i is the groupPosition and i1 is the childPosition . You should only rely on these parameters to determine the content of each row rather than using an external counter.

You can get an one-dimensional array index by the follow calculation:

int sum = 0;
for(int j = 0;j < i; j++)
{
       sum += getChildrenCount(j);
}
final int arrayIndex = sum + i1;
holder.button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Log.i("Tag Value = ",arrayIndex);
        }
 }