java - 如何从 onItemClickListener 内部获取 id？

Question

我有我的数据库，并在 ListView 中显示一些数据。当用户单击 ListView 中的项目时，我想将数据传递给另一个 Activity

long idProjeto;
ProjetosDAO pDAO;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_lista_projetos);

    ListView lv = (ListView)findViewById(R.id.lvListaProjetos);

    final ListaProjetosAdapter adapter = new ListaProjetosAdapter(this);


    pDAO = new ProjetosDAO(this);   
    pDAO.open();

    Cursor cursor = pDAO.consultaParaListaprojetos();
    String data = "";
    String cliente = "";
    String tipoProjeto = "";
    String status = "";     

    if(cursor != null && cursor.moveToFirst()){
        do{

            data = cursor.getString(0);
            cliente = cursor.getString(1);
            tipoProjeto = cursor.getString(2);
            status = cursor.getString(3);
            idProjeto = Long.parseLong(cursor.getString(4));

                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");
                try {

                    Date date = sdf.parse(data);
                    data = new SimpleDateFormat("dd/MM/yyyy HH:mm").format(date);                          

                } catch (ParseException e) {
                   e.printStackTrace();
                }

            adapter.addDadosListaprojetos(data, cliente, tipoProjeto, status, idProjeto);

        }while(cursor.moveToNext());
        cursor.close();
        pDAO.close();           
    }       

    lv.setAdapter(adapter);

    lv.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View v, int position, long id) {


            Intent intent = new Intent(ListaProjetosActivity.this, ListaCheckinsActivity.class);    
            intent.putExtra("idProjeto", idProjeto);
            startActivity(intent);

        }
    });

}

public void novoProjeto(View v) {
    Intent intent = new Intent(this, NovoProjetoActivity.class);
    startActivity(intent);

}

}

我想将此 idProjeto 传递给另一个 Activity ，但它仅传递最后一项的数据。 while 中的每次循环，变量都会获得其他值。 如何获得正确的值？

Answer 1

当然，该值将在循环的每次迭代中被覆盖。不要将它们放入 long 变量中，而是将它们放入 ArrayList 中。然后使用 onItemClick() 中的 position 值从 ArrayList

检索该值

   lv.setOnItemClickListener(new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View v, int position, long id) {

        idProjeto = arrayList.get(position);  // assuming you create a member variable ArrayList<Long> arrayList = new ArrayList<Long>()
        Intent intent = new Intent(ListaProjetosActivity.this, ListaCheckinsActivity.class);    
        intent.putExtra("idProjeto", idProjeto);
        startActivity(intent);