Question

首先，stackoverflow是我大学访问最多的网站= D. 好吧，我有一个微调器有一些信息（我正在尝试做一个消息应用程序）。我们来看看代码：

public void fillEmployee() {
    EmployeeDAO dao = new EmployeeDAO(getBaseContext());
    spnDestinationMsg = (Spinner) findViewById(R.id.spnDestinationMsg);
    String query = "SELECT * FROM employee ORDER BY mysql_id ASC";

    Cursor cursor = dao.cacthByCursor(query);
    String[] from = { "mysql_id", "name" };
    int[] to = { R.id.txtMysql_Id_employee, R.id.txtName_employee };

    SimpleCursorAdapter ad = new SimpleCursorAdapter(getBaseContext(), R.layout.item_employee, cursor, from, to, 0);
    spnDestinationMsg.setAdapter(ad);}

在我的对象Employee中我有以下字段：

    private long id;
    private long mysql_id;
    private String name;
    private int updatestatus;

好的，现在我必须将mysql_id设置为employee对象，其值来自微调器（当我第一次启动应用程序时，mysql_id来自web服务）。我需要获取mysql_id。

例如：

EmployeeDAO  emp1 =  new EmployeeDAO(getBaseContext());

emp1.setMySql_id(spnDestinationMsg.getAdapter().getItemId(spnDestinationMsg .getSelectedItemPosition()));

我遇到的问题是因为微调器只是获取数组的值或_id的值。我需要访问mysql_id。我怎样才能做到这一点？有没有办法访问存储在微调器中的任何数据。因为在光标内部我从表中选择了所有内容。如何访问其他值？如果我想抓住updatestatus的值，例如？（我点击微调项目，我捕获任何值 - mysql_id，_id，updatestatus等等。有可能吗？）。 PS：我想在不使用OnSelectedListener的情况下执行此操作，因为用户可能无法更改微调器。感谢您的帮助。

Answer 1

你可以轻松使用OnSelectedListener，尽管你对用户没有做出改变的感觉。

public class SpinnerActivity extends Activity implements OnItemSelectedListener {
...

   public void onItemSelected(AdapterView<?> parent, View view, 
        int pos, long id) {
    // An item was selected. You can retrieve the selected item using
    // parent.getItemAtPosition(pos)
   }

  public void onNothingSelected(AdapterView<?> parent) {
    // Another interface callback
  }
}

如果用户实际上没有更改任何内容，“OnNothingSelected”回调将为您保存

Answer 2

为微调器创建自己的自定义适配器

public class CustomSpinnerAdapter extends BaseAdapter  {

private Activity context;

public MySpinnerAdapter (Activity context){
    this.context=context;
}

@Override
public int getCount() {
    return 0;
}

@Override
public Object getItem(int position) {
    return null;
}

@Override
public long getItemId(int position) {
    return 0;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    RelativeLayout item= (RelativeLayout)context.getLayoutInflater().inflate(R.layout.<your spinner item layout name>, null); 

  //Your data to layout components

  item.setTag(<your tag object>);

    return item;
}

}

Answer 3

这是整个代码：

public class MsgCadActivity extends Activity implements OnItemSelectedListener{

private static final String PREF_NAME = "LoginActivityPreferences";
SharedPreferences sp;

static Spinner spnDestinoMsg;
static EditText txtAssuntoMsg;
static EditText txtMsg;
static Button btnEnviarMsg;
static Mensagem mensagem;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_msg_cad);
    populaFuncionarioDestino();

}

@Override
protected void onPause() {
    super.onPause();
    finish();
}

public void populaFuncionarioDestino() {
    FuncionarioDAO dao = new FuncionarioDAO(getBaseContext());
    spnDestinoMsg = (Spinner) findViewById(R.id.spnDestinoMsg);
    String query = "SELECT * FROM funcionario ORDER BY mysql_id ASC";

    Cursor cursor = dao.recuperarPorQueryCursor(query);
    String[] from = { "mysql_id", "nome" };
    int[] to = { R.id.txtMysql_Id_funcionario, R.id.txtNome_funcionario };

    SimpleCursorAdapter ad = new SimpleCursorAdapter(getBaseContext(), R.layout.item_funcionario, cursor, from, to, 0);
    spnDestinoMsg.setAdapter(ad);

}// endpopularFornecedor()

public void salvar(View v) {

    sp = getSharedPreferences(PREF_NAME, MODE_PRIVATE);
    Long funcionario_id = sp.getLong("funcionario_id", 0);      
    Log.d("MsgCadActivity ", " funcionario_id ->"+ funcionario_id.toString());
    // Linkar xml com objetos
    spnDestinoMsg = (Spinner) findViewById(R.id.spnDestinoMsg);
    txtAssuntoMsg = (EditText) findViewById(R.id.txtAssuntoMsg);
    txtMsg = (EditText) findViewById(R.id.txtMsg);
    btnEnviarMsg = (Button) findViewById(R.id.btnEnviarMsg);

    mensagem = new Mensagem();

    // VALIDACOES
    if ((Util.validateNotNull(txtAssuntoMsg, "Preencha o Assunto!"))
            & (Util.validateNotNull(txtMsg, "Preencha a Mensagem!"))) {

        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String currentDateandTime = sdf.format(new Date());

        mensagem.setAssunto(txtAssuntoMsg.getEditableText().toString());
        mensagem.setMsg(txtMsg.getEditableText().toString());
        mensagem.setFuncionario_origem_id(funcionario_id);          

        mensagem.setEnviado(currentDateandTime);

        MensagemDAO dao =  new MensagemDAO(getBaseContext());

        //dao.salvar(mensagem);
        //Toast.makeText(this, "Mensagem enviada com Sucesso!", Toast.LENGTH_LONG).show();
        //dao.fecharConexao();
        //finish();
    }// end if

}// end salvarFM()

@Override
public void onItemSelected(AdapterView<?> parent, View view, int position,
        long id) {

        int pos =  (Integer) parent.getItemAtPosition(position);
        Log.d("MsgCadActivity ", " pos ->"+ pos);

}

@Override
public void onNothingSelected(AdapterView<?> parent) {
    // TODO Auto-generated method stub

}

}

如何从微调器中检索一个信息（mysql_id）

3 个答案: