Android- adding objects dynamically to the list view

Question

My aim is to push the list item to the end of the list when the check box is enabled. My list item is an object "Task".

ListView lv=this.getListView();
int size=lv.getCount();
Myarrayadapter adapter = new Myarrayadapter(this,getTasks());   
lv.setAdapter(adapter);
lv.invalidateViews();


private List<Task> getTasks() {
List<Task> list = new ArrayList<Task>();
for(int k=0;k<taskname.length;k++)//taskname is an array of tasknames
{
list.add(new Task(taskname[k],status[k]));
    return list;
}

Myarrayadapter class is shown below.my aim is to check whether checkbox is enabled.If yes, make some changes(text Colour and button text) and move this changed view to the last position.

public class Myarrayadapter extends ArrayAdapter<Task> {
private final Activity context;
private final List<Task> list;

public Myarrayadapter(Activity context, List<Task> list) {
super(context, R.layout.list_item, list);
this.context = context;
this.list=list;
}

public View getView(final int position, View convertView, ViewGroup parent) {

LayoutInflater inflater = context.getLayoutInflater();
View rowView = inflater.inflate(R.layout.list_item, null, true);
final TextView text = (TextView) rowView.findViewById(R.id.label);
CheckBox checkbox = (CheckBox) rowView.findViewById(R.id.cb);
final Button btnChild = (Button) rowView.findViewById(R.id.directions);
text.setText(list.get(position).getName());
checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            // TODO Auto-generated method stub
                if(isChecked)
                {
                    text.setTextColor(Color.parseColor("#468765"));
                    btnChild.setText("Revert");
                    Task taskItem= list.get(position);
                    list.remove(position);
                    list.add(taskItem);

                }
        }});

    return rowView;
}

Its not moving the exact listitem I wanted.

Thanks in Advance!!!!

Paresh Mayani · Accepted Answer · 2011-10-25 06:04:51Z

1

You need to call notifyDataSetChanged() to update the listview:

list.remove(position);
list.add(taskItem);
notifyDataSetChanged();   // add this line after adding task again at last position

edited Oct 25, 2011 at 6:04

answered Oct 25, 2011 at 5:43

Paresh Mayani

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3 Comments

Adil Soomro Over a year ago

@siraj: since notifyDataSetChanged(); belongs to Adapter, then you have to call just notifyDataSetChanged(); (without variable or Myarrayadapter.this.notifyDataSetChanged();)

Paresh Mayani Over a year ago

@AdilSoomro yes adil you may right, as he need to make a call of notifyDataSetChanged() in adapter itself so i think he just need to call notifyDataSetChanged()

siraj Over a year ago

Thanks it works.The item is pushed to the end of the list.But the changes i have made in colour and button is not maintained.pls help me.

Carnal · Accepted Answer · 2011-10-25 06:59:57Z

Try this (didn't write your whole adapter but you see the parts you need to replace):

        View v = convertView;

        if(v == null){
            LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v = vi.inflate(R.layout.list_item, null);
        }

        final Task task = getItem(position);
        if(isChecked)
        {
              text.setTextColor(Color.parseColor("#468765"));
              btnChild.setText("Revert");
              list.remove(task);
              list.add(task);
              notifyDataSetChanged();
        }
       return v;

To get the new changes of the button and color you'll need to need to setColor and setText (create your own setColor() and setText() in Task.class) on the Task after removing it, then add it and make if else statements in adapter (by using getColor() and getText()), to check which color the task has and which text.

ductran · Accepted Answer · 2011-10-25 05:23:35Z

0

You should Override some method in your ArrayAdapter

@Override
public int getCount() { 
    return list.size();
}

@Override
public Object getItem(int position) {
    return list.get(position);
}

answered Oct 25, 2011 at 5:23

ductran

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