How to disable ListView item after it has been clicked?

问题

I have a simple array of Strings that I was displaying in a horizontal ListView with an ArrayAdapter. What I'm looking to do is: when the user selects an item from the ListView, make that item not clickable and change the background color of that item. Perhaps like a "grayed-out" look to it. I was looking into creating a custom Adapter and overriding the isEnabled(int position) method but I don't know how I would go about this. Any advice, suggestions, or help will be greatly appreciated thanks!

回答1:

I was looking into creating a custom Adapter and overriding the isEnabled(int position) method but I don't know how I would go about this.

This is quite easy to do. I recommend a SparseBooleanArray to track the enabled items for efficiency:

public class MyAdapter extends ArrayAdapter<String> {
    private SparseBooleanArray enabledItems = new SparseBooleanArray(); 

    public MyAdapter(Context context, int textViewResourceId, List<String> objects) {
        super(context, textViewResourceId, objects);
    }

    @Override
    public boolean areAllItemsEnabled() {
        return false;
    }

    @Override
    public boolean isEnabled(int position) {
        return enabledItems.get(position, true);
    }

    public void toggleItem(int position) {
        boolean state = enabledItems.get(position, true);
        enabledItems.put(position, !state);
    }
}

The AutoComplete feature of Eclipse did must of the work, but here are some quick notes:

You must override areAllItemsEnabled() along with isEnabled()
I designed toggle() to be used by an onItemClickListener() you only need to call adapter.toggle(position)

If you want to change the row's appearance (more than what enabling and disabling does by default) simply override getView(). Don't forget to cover both cases:

public View getView(int position, View convertView, ViewGroup parent) {
    convertView = super.getView(position, convertView, parent);

    if(!isEnabled(position)) { 
        /* change to disabled appearance */ 
    } 
    else { 
        /* restore default appearance */ 
    }
    return convertView;
}

Hope that helps!

回答2:

pass position to adapter class when you click on list item

 @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id)
    {
        adapter.setSelectedIndex(position);
    }

add method of setSelectedIndex to adapter class

  public void setSelectedIndex(int ind)
    {
        selectedIndex = ind;
        notifyDataSetChanged();
    }

Now check the postion of this listview if same then enable and disable value in getView me method

 if(selectedIndex!= -1 && position == selectedIndex)
        {
            holder.tv.setBackgroundColor(Color.BLACK);
        }
        else
        {
            holder.tv.setBackgroundColor(selectedColor);
        }
        holder.tv.setText("" + (position + 1) + " " + testList.get(position).getTestText());

Reference from here

回答3:

Use setEnabled(bool) property:

yourlistview.setEnabled(false);

回答4:

Not sure whether it will work or not

    public void onItemClick(AdapterView<?> parent, View view, int position,
                long id) {
                // your code
                view.setBackgroundColor(Color.BLUE);
                view.setEnabled(false);
    }

来源：https://stackoverflow.com/questions/15885928/how-to-disable-listview-item-after-it-has-been-clicked

标签

java

android

listview

android-listview

android-arrayadapter