Android - How to remove custom list item on button click?

Question

Android - How to remove custom list item on button click?

I have my own list box with two two text boxes and a delete button. I want to remove a list item when the delete button is clicked I tried these answers to remove an item from a custom viewlist , Remove selected item from a ListView , Remove ListView items on Android with no luck.

This is my adapter class

public class SpecialListAdapter extends BaseAdapter
{
Activity context;
List<String> id = new ArrayList<String>();
List<String> name = new ArrayList<String>();
List<String> newid = new ArrayList<String>();
List<String> newname = new ArrayList<String>();

ViewHolder holder;

public SpecialListAdapter(Activity context, List<String> id, List<String> name) {
    super();
    this.context = context;
    this.id = id;
    this.name = name;
}

public int getCount() {
    // TODO Auto-generated method stub
    return id.size();
}

public Object getItem(int position) {
    // TODO Auto-generated method stub
    return null;
}

public long getItemId(int position) {
    // TODO Auto-generated method stub
    return 0;
}

private class ViewHolder {
    TextView txtViewID;
    TextView txtViewName;
    ImageButton btnDelete;

}

public View getView(final int position, View convertView, ViewGroup parent)
{
    // TODO Auto-generated method stub

    LayoutInflater inflater =  context.getLayoutInflater();

    if (convertView == null)
    {
        convertView = inflater.inflate(R.layout.special_list_item, null);
        holder = new ViewHolder();
        holder.txtViewID = (TextView) convertView.findViewById(R.id.specialId);
        holder.txtViewName = (TextView) convertView.findViewById(R.id.specialName);

        holder.txtViewID.setText(id.get(position));
        holder.txtViewName.setText(name.get(position));

        holder.btnDelete = (ImageButton) convertView.findViewById(R.id.bDelete);
        holder.btnDelete.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                id.remove(position);
                name.remove(position);
                notifyDataSetChanged();

            }
        });


        convertView.setTag(holder);
    }
    else
    {
        holder = (ViewHolder) convertView.getTag();
    }



return convertView;
}
}

Edit

Error log:

12-18 17:39:46.030: D/AndroidRuntime(17893): Shutting down VM
12-18 17:39:46.030: W/dalvikvm(17893): threadid=1: thread exiting with uncaught exception (group=0x40dc3930)
12-18 17:39:46.053: E/AndroidRuntime(17893): FATAL EXCEPTION: main
12-18 17:39:46.053: E/AndroidRuntime(17893): java.lang.UnsupportedOperationException
12-18 17:39:46.053: E/AndroidRuntime(17893):    at java.util.AbstractList.remove(AbstractList.java:638)
12-18 17:39:46.053: E/AndroidRuntime(17893):    at java.util.AbstractList$SimpleListIterator.remove(AbstractList.java:75)
12-18 17:39:46.053: E/AndroidRuntime(17893):    at java.util.AbstractCollection.remove(AbstractCollection.java:229)
12-18 17:39:46.053: E/AndroidRuntime(17893):    at .SpecialListAdapter$1.onClick(SpecialListAdapter.java:83)
12-18 17:39:46.053: E/AndroidRuntime(17893):    at android.view.View.performClick(View.java:4202)
12-18 17:39:46.053: E/AndroidRuntime(17893):    at android.view.View$PerformClick.run(View.java:17340)
12-18 17:39:46.053: E/AndroidRuntime(17893):    at android.os.Handler.handleCallback(Handler.java:725)
12-18 17:39:46.053: E/AndroidRuntime(17893):    at android.os.Handler.dispatchMessage(Handler.java:92)
12-18 17:39:46.053: E/AndroidRuntime(17893):    at android.os.Looper.loop(Looper.java:137)
12-18 17:39:46.053: E/AndroidRuntime(17893):    at android.app.ActivityThread.main(ActivityThread.java:5039)
12-18 17:39:46.053: E/AndroidRuntime(17893):    at java.lang.reflect.Method.invokeNative(Native Method)
12-18 17:39:46.053: E/AndroidRuntime(17893):    at java.lang.reflect.Method.invoke(Method.java:511)
12-18 17:39:46.053: E/AndroidRuntime(17893):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-18 17:39:46.053: E/AndroidRuntime(17893):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-18 17:39:46.053: E/AndroidRuntime(17893):    at dalvik.system.NativeStart.main(Native Method)

+3

android android-listview

AhulR Dec 18 14 at 10:37

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5 answers

snachmsm · Answer 1 · 2014-12-18T10:39:52+0000

you only remove from "name" List

and you have

public int getCount() {
// TODO Auto-generated method stub
    return id.size();
}

therefore the number of elements in the list does not change.

add to onClick

line id.remove(position);

, thennotifyDataSetChanged();

also puts this

holder.btnDelete.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            id.remove(position);
            name.remove(position);
            notifyDataSetChanged();

        }
    });

outside / below if(convertView == null){...} else {...}

and store ViewHolder

inside the method ViewHolder holder;

above thisif

Hemendra sharma · Answer 2 · 2014-12-18T10:42:19+0000

Suppose you have a global variable for you String Array in Activity class ...

List<String> globalIDArray = new List<String>();
List<String> globalNamesArray = new List<String>();

You are installing an adapter for a list like ...

myListView.setAdapter(new SpecialListAdapter(getApplicationContext(), globalIDArray, globalNamesArray);

Now press the button ...

button.setOnClickListener(new OnClickListener() {
       @Override
       public void onClick(View v)
       {
              globalIDArray.remove("id to remove");
              globalNamesArray.remove("name to remove");
              // now just invalidate the views and it will do remaining work automatically
              myListView.invalidateViews();
       }
}

Edit:

You can implement functionality to remove an item right inside the adapter's getView function. Something like that...

public View getView(final int position, View convertView, ViewGroup parent)
{
    // TODO Auto-generated method stub

    LayoutInflater inflater =  context.getLayoutInflater();

    if (convertView == null)
    {
        convertView = inflater.inflate(R.layout.special_list_item, null);
        holder = new ViewHolder();
        holder.txtViewID = (TextView) convertView.findViewById(R.id.specialId);
        holder.txtViewName = (TextView) convertView.findViewById(R.id.specialName);

        holder.txtViewID.setText(id.get(position));
        holder.txtViewName.setText(name.get(position));

        holder.btnDelete = (ImageButton) convertView.findViewById(R.id.bDelete);

        //
        // Set tag to button so we can use ID and Name values at 'onClick'
        //
        holder.btnDelete.setTag(new ID_Name_Set(id.get(position), name.get(position)));

        holder.btnDelete.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // retrieve tag object and fetch ID and Name from this object

                ID_Name_Set set = (ID_Name_Set)v.getTag();
                id.remove(set.ID);
                name.remove(set.Name);
                notifyDataSetChanged();

            }
        });


        convertView.setTag(holder);
    }
    else
    {
        holder = (ViewHolder) convertView.getTag();
    }
    return convertView;
}

private class ID_Name_Set
{
    public String ID = "";
    public String Name = "";

    public ID_Name_Set(String id, String name)
    {
        this.ID = id;
        this.Name = name;
    }
}

Hope this helps.

:)

denizt · Answer 3 · 2014-12-18T10:50:09+0000

You should add the position of the position to your button by following this and then in the onClick method you should also remove it from the actual list.

holder.btnDelete = (ImageButton) convertView.findViewById(R.id.bDelete);
holder.btnDelete.setTag(position);

and in your onClick method add these new lines:

int pos = (Integer)v.getTag();
//remove item from list and notifydatasetChanged
name.remove(pos);
notifyDataSetChanged();

and one more thing: you must also add tags to your views, in the case of "convertview! = null".

Hope this helps you as it helps me solve my problem.

Sincerely.

Carnal · Answer 4 · 2014-12-18T12:23:14+0000

List<String> id = new ArrayList<String>();
List<String> name = new ArrayList<String>();

it should be

ArrayList<String> id;
ArrayList<String> name;

List

will be unmodified, use ArrayList

then use in your constructor

this.id = new ArrayList<String>(id);
this.name = new ArrayList<String>(name);

deepak825 · Answer 5 · 2014-12-18T12:36:42+0000

    if (convertView == null)
    {
    convertView = inflater.inflate(R.layout.special_list_item, null);
    holder = new ViewHolder();



    convertView.setTag(holder);
    }
    else
    {
    holder = (ViewHolder) convertView.getTag();
     }
    holder.txtViewID = (TextView) convertView.findViewById(R.id.specialId);
    holder.txtViewName = (TextView) convertView.findViewById(R.id.specialName);

    holder.txtViewID.setText(id.get(position));
    holder.txtViewName.setText(name.get(position));

    holder.btnDelete = (ImageButton) convertView.findViewById(R.id.bDelete);
    holder.btnDelete.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            id.remove(position);
            name.remove(position);
            notifyDataSetChanged();

        }
    });

Android - How to remove custom list item on button click?

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