How to know in which item a button was clicked

Question

So far i have a list view with a custom adapter, and each item in list has a button. Im really confused; Im trying to do the following:

When user clicks on button(a delete button) in item in the list, i want to know in which item button was clicked so i can know which item to delete-how do i implement this? Ive seen something about setting tags, but Im still very lost.

I have also tried to reach the button from the list layout from my main activity, and cannot reference it.

please can you give me a detailed description on how to do what i want to do thanks.

ADDED adapter code:

public class LocationAdapter extends BaseAdapter{
String [] n;
Context context;
String[] a;

private static LayoutInflater inflater=null;
public LocationAdapter(MainActivity mainActivity, String[] names, String[] addresses) {
    // TODO Auto-generated constructor stub
    n=names;
    context=mainActivity;
    a=addresses;
    inflater = ( LayoutInflater )context.
            getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
    // TODO Auto-generated method stub
    return n.length;
}

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

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

public class Holder
{
    TextView name;
    TextView address;
    ImageButton ib;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    Holder holder=new Holder();
    View rowView;
    rowView = inflater.inflate(R.layout.rowlayout2, null);
    holder.name =(TextView) rowView.findViewById(R.id.EditTextName);
    holder.address =(TextView) rowView.findViewById(R.id.EditTextAddress);
    holder.ib = (ImageButton) rowView.findViewById(R.id.Delete);
    holder.name.setText(n[position]);
    holder.address.setText(a[position]);
    holder.ib.setTag(convertView);
    rowView.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Toast.makeText(context, "You Clicked "+n[position], Toast.LENGTH_LONG).show();
        }

    });
    return rowView;
}

}

Answer 1

Implement an OnClickListener for your delete button.

When the delete button is clicked, remove the row in the data source at position , and then call notifyDataSetChanged()

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    Holder holder=new Holder();
    View rowView;
    rowView = inflater.inflate(R.layout.rowlayout2, null);
    holder.name =(TextView) rowView.findViewById(R.id.EditTextName);
    holder.address =(TextView) rowView.findViewById(R.id.EditTextAddress);
    holder.ib = (ImageButton) rowView.findViewById(R.id.Delete);
    holder.name.setText(n[position]);
    holder.address.setText(a[position]);
    holder.ib.setTag(convertView);

    //Add this for on-click of delete button
    holder.ib.setOnClickListener(new OnClickListener(){
         //Delete the row in your data source specified at position

    });

    rowView.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Toast.makeText(context, "You Clicked "+n[position], Toast.LENGTH_LONG).show();
        }

    });
    return rowView;
}

Answer 2

Use this inside your getView() method of adapter.

    yourButton.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
               System.out.println("button : "+position+ " clicked");
               // Do you code here.
        }
    });

Answer 3

You need to add the onClick in the getView .

Example :

http://jmsliu.com/2444/click-button-in-listview-and-get-item-position.html

Theres a lot of tutorials for this out there.

Answer 4

public class SeekBarAdapter {private SeekBarListener mListener;
private ClickListener mListenerClick;
public interface SeekBarListener {

    public void onProgressChanged(SeekBar seekBar, int progress,
            boolean fromUser, int positionInList);

    public void onStartTrackingTouch(SeekBar seekBar, int positionInList);

    public void onStopTrackingTouch(SeekBar seekBar, int positionInList);
}

public interface ClickListener {
    public void onClick(View v, int positionInList);

}

public listAdapter getAdapter(Context context, ItemPhotoEffect itemPhotoEff) {
    return new listAdapter(context, itemPhotoEff);
}

public void setSeekBarListener(SeekBarListener listener) {
    mListener = listener;
}

public void setClickListener(ClickListener listener) {
    mListenerClick = listener;
}

public class listAdapter extends BaseAdapter {
    private LayoutInflater mInflater;
    private onSeekbarChange mSeekListener;
    private onClickChange mImgClickListener;
    private ArrayList<Bitmap> itemsList;
    private Bitmap imgIcon;
    private ArrayList<Integer> positionProgress;
    private ArrayList<ColorEffectItem> colorItem;

    public listAdapter(Context context, ItemPhotoEffect itemPhotoEff) {
        mInflater = LayoutInflater.from(context);
        if (mSeekListener == null) {
            mSeekListener = new onSeekbarChange();
        }
        if (mImgClickListener == null) {
            mImgClickListener = new onClickChange();
        }
        this.itemsList = itemPhotoEff.getSeekBarItem().getIconSeekBar();
        this.positionProgress = itemPhotoEff.getSeekBarItem()
                .getPositionProgress();

        // if (itemPhotoEff.getSeekBarItem().getColorItem() != null) {
        this.colorItem = itemPhotoEff.getSeekBarItem().getColorItem();
        // }
    }

    @Override
    public int getCount() {
        if (itemsList != null) {
            return itemsList.size();

        } else {
            return 0;
        }
    }

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

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        final ViewHolder holder;

        // if (convertView == null) {
        holder = new ViewHolder();
        convertView = mInflater.inflate(R.layout.seekbar_adapter_layout,
                null);
        holder.img = (ImageView) convertView.findViewById(R.id.imageView1);
        holder.seekbar = (SeekBar) convertView.findViewById(R.id.seekBar1);
        holder.colorbutton = (ImageView) convertView
                .findViewById(R.id.colorImage);
        holder.ln_img = (LinearLayout) convertView
                .findViewById(R.id.ln_colorimg);
        convertView.setTag(holder);
        // } else {
        // holder = (ViewHolder) convertView.getTag();
        // }
        holder.img.setImageBitmap(itemsList.get(position));

        if (positionProgress.get(position) != null) {
            holder.seekbar.setVisibility(View.VISIBLE);
            holder.ln_img.setVisibility(View.GONE);
            holder.seekbar.setProgress(positionProgress.get(position));
        } else {
            holder.ln_img.setVisibility(View.VISIBLE);
            holder.seekbar.setVisibility(View.GONE);
            holder.colorbutton.setBackgroundColor(Color.rgb(this.colorItem
                    .get(position).getRcolor(), this.colorItem
                    .get(position).getGcolor(), this.colorItem
                    .get(position).getBcolor()));
        }
        holder.seekbar.setOnSeekBarChangeListener(mSeekListener);
        holder.ln_img.setOnClickListener(mImgClickListener);
        holder.seekbar.setTag(position);
        holder.ln_img.setTag(position);
        return convertView;

    }
}

static class ViewHolder {
    ImageView img;
    SeekBar seekbar;
    ImageView colorbutton;
    LinearLayout ln_img;
}// This is class you need to know which button has been click
public class onClickChange implements OnClickListener {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        int position = (Integer) v.getTag();
        if (mListenerClick != null) {
            mListenerClick.onClick(v, position);
        }
    }

}

public class onSeekbarChange implements OnSeekBarChangeListener {

    @Override
    public void onProgressChanged(SeekBar seekBar, int progress,
            boolean fromUser) {
        int position = (Integer) seekBar.getTag();

        if (mListener != null) {
            mListener.onProgressChanged(seekBar, progress, fromUser,
                    position);
        }
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
        int position = (Integer) seekBar.getTag();
        if (mListener != null) {
            mListener.onStartTrackingTouch(seekBar, position);
        }
    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
        int position = (Integer) seekBar.getTag();
        if (mListener != null) {
            mListener.onStopTrackingTouch(seekBar, position);
        }
    }
}}

You can use mycode. Implements interface OnclickListener in your adapter. And then implement in activity:
+ PositionInList use if you have than 1 button in row.

adapter.setClickListener(new ClickListener() {
        @Override
        public void onClick(View v, int positionInList) {
            // TODO Auto-generated method stub
            Log.i("", "Click on position in list" + positionInList);
        }
    });

Answer 5

You should not use Array. Array has fixed length so you cannot exactly remove its element. You need to use ArrayList in place of Array and implement ViewHolder pattern correctly:

ArrayList<Item> items = new ArrayList<>();
//merge both the content of a and n into one object "Item"
//and use ArrayList

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

      Holder holder;
      if (convertView == null) {
        convertView = LayoutInflater.from(getContext()).inflate(R.layout.rowlayout2, parent, false);
        holder = new Holder(convertView);
        convertView.setTag(holder);
       } else {
        holder = (Holder) convertView.getTag();
       }

       holder.name.setText(getItem(position).name);
       ...
       holder.root.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            items.remove(position);
            notifyDataSetChanged();
        }
       });
     return convertView;
}

If you want to set clickable on the whole row with then you need to put the root element inside the ViewHolder.

class Holder{
   TextView name, address, ...;
   LinearLayout root; // or any Layout which is the root container of your row
}