Hide ListView items in android and refresh onClick event

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Hide ListView items in android and refresh onClick event

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#1 by (1 votes)

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I want to hide the items according to a parameter in a ListView. I have done this and it works:

    final ArrayList<? extends IMenuPrintable> adapterArray = sessionUser.getAvailableServicesForCategoryId(categoryId); 
    ListView listView = (ListView) findViewById(R.id.main_menu_list_view);
    listView.setAdapter(new MenuAdapter(this, adapterArray));
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {        
                menuItemClicked(position);        

        }
    });

The MenuAdapter class is:

public class MenuAdapter extends BaseAdapter {

    private ArrayList<? extends IMenuPrintable> items;
    private Context context;
    private ArrayList<Integer> hiddenPositions = new ArrayList<>();

    public MenuAdapter(Context context, ArrayList<? extends IMenuPrintable> items) {
        this.context = context;
        this.items = items;

        if (this.items == null) {
            this.items = new ArrayList<>();
        }    
    }

    @Override
    public int getCount() {
        return this.items.size() - hiddenPositions.size();
    }

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

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = ((Activity) context).getLayoutInflater().inflate(R.layout.main_menu_row, parent, false);
        }
        LDService service = (LDService) items.get(position);
        if (service.type.equals("4")) {
            hideItem(position);
            for (Integer hiddenIndex : hiddenPositions) {
                if (hiddenIndex <= position) {
                    position = position + 1;
                }
            }
        }
        return convertView;
    }

    private void hideItem(int itemToHide) {    
        if (!hiddenPositions.contains(itemToHide)) {
            hiddenPositions.add(itemToHide);
        }    
    }

    private void menuItemClicked(int position) {

        ArrayList<? extends IMenuPrintable> services = sessionUser.getAvailableServicesForCategoryId(categoryId)
        LDService service = (LDService) services.get(position);
        //para cada 'service' compruebo ciertos parámetros...
    }
}

With this I manage to hide the items but the functionality does not exist. When I click on the first item that is displayed, it has the position of the item hidden. That is, the function 'menuitemclicked ()' is passed as a parameter to the position of the default item (the hidden item). I want to update that position. How could I do it?

android listview

asked by Miguel Angel Martinez Sanchez 03.12.2016 в 12:27

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1 answer

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score 1 · Accepted Answer

The getView() method of an adapter should not be used to handle the logic of what is to be deployed, but only to inflate the view. The adapter is only a bridge between the data and the UI and should not be smarter than that. Take out the logic of what you are going to show about that method

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    if (convertView == null) {
        convertView = ((Activity) context).getLayoutInflater().inflate(R.layout.main_menu_row, parent, false);
    }         

    // Aquí debes hacer findViewById() como en una Actividad para cada elemento visual del item


    return convertView;
}

I'm not 100% sure where the logic that you put there should go but the safest thing is that you can do it within menuItemClicked() . Just remember that every time you hide an item, you have to remove it from items and call notifyDatasetChanged() , therefore you must also change:

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

I would also recommend using the ViewHolder pattern because you use a ListView and can get to laggearse your UI.