android - 相关微调器 Android

Question

我是 android 初学者。我正在做一个项目。但是我很难做两个相互关联的微调器。实际上，一个微调器用于乡村，另一个用于城市。第二个微调器将显示城市，而不是所选的国家/地区。

我使用了“OnItemSelectedListener”，但不能在 OnItemSelectedListener 中使用“ArrayAdapter.createFromResource e”。我尝试了很多其他方法，但仍然没有用。有人可以帮帮我吗？？？

(附:我已经阅读并尝试了有关此主题的其他帖子，但仍然无效)这是代码:

spinner.setOnItemSelectedListener(
            new OnItemSelectedListener() {
                public void onItemSelected(
                        AdapterView<?> parent, View view, int position, long id) {


                    int spinnerId = spinner.getSelectedItemPosition();
                    if (spinnerId==0){
    adaptert = ArrayAdapter.createFromResource(
            this, R.array.tirana, android.R.layout.simple_spinner_item);
    adaptert.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    }
    else if (spinnerId==1) {
        adaptert = ArrayAdapter.createFromResource(
                this, R.array.durres, android.R.layout.simple_spinner_item);
        adaptert.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        }

    spinnert.setAdapter(adaptert);


                }

                public void onNothingSelected(AdapterView<?> parent) {

                }
            });

Answer 1

public class AdapterViewImplementation extends Activity implements OnItemSelectedListener{

    Spinner sp1; // One Spinner
    Spinner sp2;  // Another Spinner
    ArrayAdapter stateAdapter;  // Adapter for state
    ArrayAdapter cityAdapter;  // Adapter for city

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        sp1 = (Spinner)findViewById(R.id.Spinner01);
        sp2 = (Spinner)findViewById(R.id.Spinner02);


        stateAdapter = ArrayAdapter.createFromResource(AdapterViewImplementation.this,
                R.array.state, android.R.layout.simple_spinner_item);
        stateAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        sp1.setAdapter(stateAdapter);
        sp1.setOnItemSelectedListener(AdapterViewImplementation.this);


        cityAdapter = ArrayAdapter.createFromResource(AdapterViewImplementation.this,
                R.array.city, android.R.layout.simple_spinner_item);
        cityAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        sp2.setAdapter(cityAdapter);
        sp2.setOnItemSelectedListener(AdapterViewImplementation.this);


    }

    @Override
    public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
            long arg3) {
        // TODO Auto-generated method stub

        if(arg0 == sp1){

            sp2.setSelection(arg2);

        }else{

            sp1.setSelection(arg2);

        }

    }

    @Override
    public void onNothingSelected(AdapterView<?> arg0) {
        // TODO Auto-generated method stub

    }
}