将 Spinner 值发送到内部 class 外部的 String 变量

Question

我正在尝试将在 Spinner 数组中选择的值项传递给 API 调用请求。

我无法获取 setOnItemSelectedListener(new AdapterView.OnItemSelectedListener().

之外的值

我尝试使用堆栈溢出答案中提供的大部分选项，但是当我尝试打印字符串时，它显示为空。

从外部获取字符串变量的正确方法是什么，以便我可以通过请求将其作为值发送，甚至打印它。

    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

声明一个 global variable 来存储 spinner's selected value 。试试下面的代码。

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，它会显示您选择的值。

Answer 2

创建全局变量并在该变量中设置值并访问所需位置。

将 Spinner 值发送到内部 class 外部的 String 变量

Sending Spinner value to String variable outside the inner class

android

spinner

android-spinner

android-studio