Question

I have a ListView with a TextView and a Checkbox on every row. I’m trying to create a sequence where the user has to click on the Checkbox of the first row to enable the next row and remove a grayed out effect. Clicking on the Checkbox in this row will do the same to the next row and so on.

Is this possible? and how?

Answer 1

Create a custom Object to keep the state of your row. For example:

class Row {
   private TextView text;
   private CheckBox box;
   private boolean grayedOut;

   //implementation...
}

Inside your Activity you make an ArrayList<Row>() and give it as source to the Adapter of your ListView.

onCreate(..){
   mArrayList = new ArrayList<Row>();
   // fill arraylist
   Adapter mAdapter = new CustomAdapter(... , ... , mArrayList);
   ListView lv = findView..
   lv.setAdapter(mAdapter);
}

The Adapter for your ListView is custom. You can follow the example found here. In your case some adjustments will be as followed:

public class CustomAdapter extends ArrayAdapter<Row>{

    public CustomAdapter(...) {
        // do stuff
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // ....

        if (item at position has gray state){
             set layout to gray
        } else {
             set layout to active
        }

        // ....
        return row;
    }

Now we have a Listview, a CustomAdapter and for each item in the list we have an Row which provides a certain state. Default all the states will be set to gray-state except the first item. Using the onItemClickedListener, we can unlock other items..

lv.setOnItemClickListener(new OnItemClickListener(){
    public void onItemClick(AdapterView<?> parent, View v, int position, Long id){        
         // do stuff...
         mArrayList.get(position+1).setGrayedOut(false);
    }
}

Good luck!