Question

I’m developing a Androidapplication using ListView.

ListView have a one file in each and every ListItem. Here, I have set onItemClickin ListView. So, that if user clicks the ListItememail application gets open and attach the particular file in email. Its for the single File, this gets implemented and working fine.

Now I want attach the multiple file in email. i.e. the implementing the CheckBoxin each ListItemand checked items have to attached into the Mail.

I know its possible because its very similar to the file manager application that checking the multiple file and deleting the all file by clicking the single Button. But don’t know how to do.

Answer 1

In you ListAdapter create a SparseBooleanArray

private SparseBooleanArray checkStatus;

This SparseBooleanArray stores the checked items. Now in getView do the following

@Override
public View getView(int position, View view, ViewGroup parent) {
    ViewCache viewCache;
    if (view == null){
        viewCache = new ViewCache();
        view = layoutInflater.inflate(R.layout.list_box, null, false);
        viewCache.checkBox = view.findViewById(R.id.check_box);            
        viewCache.checkBox.setOnCheckedChangeListener(onCheckedChangeListener);
        //other views in the list box
        ...........
    }
    vewCache = (ViewCache)view.getTag();
    viewCache.checkBox.setTag(position);
    viewCache.checkBox.setChecked(isChecked(position));
    //set other views
    ........
}

This is the class ViewCache

private static class ViewCache{        
    CheckBox checkBox;
    //other views in the list box
    .......
}

This method checks whether the position is checked

private boolean isChecked(int position){
    return checkStatus.get(position, false);
}

This is the onCheckChangeListener

CompoundButton.OnCheckedChangeListener onCheckedChangeListener = new CompoundButton.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
        checkStatus.put(((Integer)compoundButton.getTag()), b);
    }
};

Finally you can get the checked items from the SparseBooleanArray checkStatus. Think it will help you.