Retrieve data from a List View

You can implement a interface that makes a communication between your adapter and another class you want. Create a interface :

public interface MyButtonListClickListener {
    public void onClickBtnExcluir(int id);
    public void onClickBtnCancelar(int id);

}

In your adapter create an attribute of this interface and a 'set' method:

public class ListAdapter extends ArrayAdapter<Item> {
      private MyButtonListClickListener listener;

      .
      .
      .

      public void setOnMyButtonListClickListener(MyButtonListClickListener listener){
           this.listener = listener;
      }
}

Then create the events of the clicks on the buttons in your adapter and call the respective method of your interface :

btnExcluir.setOnClickListener(new OnClickListener() {
     public void onClick(View v) {
          if(listener != null){
               listener.onClickBtnExcluir(item.getId());
          }

     } 
});

btnCancelar.setOnClickListener(new OnClickListener() {
     public void onClick(View v){
          if(listener != null){
               listener.onClickBtnCancelar(item.getId());
          }       
     } 
});

Note that there is a test if listener is not null, so there is no exception when your interface has not yet been implemented. Then, in any class you use your adapter , you can include this interface and implement the onClickBtnExcluir and onClickBtnCancelar methods as you wish. The implementation of interface would be something like: / p>

adapter.setOnMyButtonListClickListener(new MyButtonListClickListener(){
     @Override
     public void onClickBtnExcluir(int id) {
          //Implemente como quiser e use o ID para localizar seu item no banco
     }
     @Override
     public void onClickBtnCancelar(int id) {
          //Implemente como quiser e use o ID para localizar seu item no banco
     }
});

You should implement the click of these buttons inside your adapter:

public class ListAdapter extends ArrayAdapter<Item> {

public ListAdapter(Context context, int textViewResourceId) {
    super(context, textViewResourceId);
}

public ListAdapter(Context context, int resource, List<Item> items) {
    super(context, resource, items);
}

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

    View v = convertView;

    if (v == null) {

        LayoutInflater vi;
        vi = LayoutInflater.from(getContext());
        v = vi.inflate(R.layout.itemlistrow, null);

    }

        final Item item = getItem(position);

        TextView id= (TextView) v.findViewById(R.id.id);
        TextView nome = (TextView) v.findViewById(R.id.nome);
        TextView apelido = (TextView) v.findViewById(R.id.apelido);
        Button  btnExcluir = (Button)v.findViewById(R.id.btnExcluir);
        Button btnCancelar = (Button)v.findViewById(R.id.btnCancelar);



         id.setText(String.valueOf(item.getId());
         nome.setText(item.getNome());
         apelido.setText(item.getApelido());

        btnExcluir.setOnClickListener(new OnClickListener() {
         public void onClick(View v)
         {
             //Exclua o item

         } 
           });

        btnCancelar.setOnClickListener(new OnClickListener() {
         public void onClick(View v)
        {
             // Cancele o item
        } 
        });



    return v;

}

After deleting or canceling an item, call the adapter.notifyDataSetChanged () function on your adapter.

This was a simple example. Search for ViewHolder in listView adapters.