Question

我正在尝试将Spinner数组中选择的值项传递给API调用请求。

我无法将值传递到setOnItemSelectedListener之外（新的AdapterView.OnItemSelectedListener（）。

我试图使用Stack溢出答案中提供的大多数选项，但是当我尝试打印String时，它显示为null。

将字符串变量放在外面的正确方法是什么，以便我可以通过请求将其作为值发送，甚至打印出来。

    public class Profile2 extends AppCompatActivity implements View.OnClickListener  {

private String gender;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //final String gender = (String) genderspinner.getSelectedItem().toString().trim();

    // Spinner gender = (Spinner) findViewById(R.id.genderspinner);
    //final EditText etGender = (EditText) findViewById(R.id.etGender);
    final Spinner genderspinner = findViewById(R.id.genderspinner);
    //String gender;
    ArrayAdapter<CharSequence> arrayAdapter = ArrayAdapter.createFromResource(this,R.array.gender, R.layout.support_simple_spinner_dropdown_item);
    arrayAdapter.setDropDownViewResource(R.layout.support_simple_spinner_dropdown_item);
    genderspinner.setAdapter(arrayAdapter);
    genderspinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

            String gendervalue = parent.getItemAtPosition(position).toString();
    //       Object item = parent.getItemAtPosition(position);
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {

        }
    });

   final String gender = String.valueOf(genderspinner.getSelectedItem());

    Log.i("TAG", "gender here : "+gender);

    // when I run the log, it is always empty. 

    //final String gender = String.valueOf(genderspinner.getSelectedItem());
   // genderspinner.setOnItemSelectedListener(this);

updateprofile(gender)

    });
}

private void updateprofile(gender) {

   // API call which sends the gender data
}
}

Answer 1

声明global variable以存储spinner's selected value。请尝试以下代码。

String gendervalue="";
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //final String gender = (String) genderspinner.getSelectedItem().toString().trim();

    // Spinner gender = (Spinner) findViewById(R.id.genderspinner);
    //final EditText etGender = (EditText) findViewById(R.id.etGender);
    final Spinner genderspinner = findViewById(R.id.genderspinner);
    //String gender;
    ArrayAdapter<CharSequence> arrayAdapter = ArrayAdapter.createFromResource(this,R.array.gender, R.layout.support_simple_spinner_dropdown_item);
    arrayAdapter.setDropDownViewResource(R.layout.support_simple_spinner_dropdown_item);
    genderspinner.setAdapter(arrayAdapter);
    genderspinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

            gendervalue = parent.getItemAtPosition(position).toString();
    //       Object item = parent.getItemAtPosition(position);
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {

        }
    });


    Log.i("TAG", "gender here : "+gendervalue);


updateprofile(gendervalue)

    });
}

您现在可以查看日志，它会显示所选的值。

Answer 2

创建全局变量并在该变量中设置值并访问所需的位置。

将Spinner值发送到内部类之外的String变量

2 个答案: