Android:从onItemSelected()方法写入全局变量

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener {
    private String selectedOption; // 全局变量

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

        Spinner spinner = findViewById(R.id.spinner);
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.options_array, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);
        spinner.setOnItemSelectedListener(this);
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        selectedOption = parent.getItemAtPosition(position).toString(); // 将选中的选项写入全局变量
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {
        // 未选择任何选项时的处理
    }
}