android - 微调器依赖于 android 中的另一个微调器

Question

http://developer.android.com/resources/tutorials/views/hello-spinner.html我使用此链接作为基础..

我有 3 个旋转器，第一个旋转器代表国家，第二个旋转器代表州，第三个旋转器代表城市。

我已经在 stackoverflow 上看到了链接，但它不太合适。

我的代码如下

public class SpinnerActivity extends Activity {

String state="";

ArrayAdapter adapter1,adapter2; Spinner spinner1,spinner2;

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

    spinner1 = (Spinner) findViewById(R.id.spinner1);
    spinner2 = (Spinner) findViewById(R.id.spinner2);

   adapter1 = ArrayAdapter.createFromResource(
           this, R.array.states_array, android.R.layout.simple_spinner_item);
   adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
   spinner1.setAdapter(adapter1);
   spinner1.setOnItemSelectedListener(new MyOnItemSelectedListener());


   if(state.equalsIgnoreCase("Gujarat"))
   {  
    adapter2 = ArrayAdapter.createFromResource(this, R.array.rajasthan_array, >android.R.layout.simple_spinner_item);
    }
  if(state == "Rajasthan")
   {
    adapter2 = ArrayAdapter.createFromResource(this, R.array.rajasthan_array, >android.R.layout.simple_spinner_item);
   }

   adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
   spinner2.setAdapter(adapter2);
   spinner2.setOnItemSelectedListener(new MyOnItemSelectedListener());

}

public class MyOnItemSelectedListener implements OnItemSelectedListener {

   public void onItemSelected(AdapterView<?> parent,View view, int pos, long id)
   {
      state=parent.getItemAtPosition(pos).toString();
     Toast.makeText(parent.getContext(), "The state is " +
         parent.getItemAtPosition(pos).toString(), Toast.LENGTH_SHORT).show();
   }
   public void onNothingSelected(AdapterView parent)
   {
    //    Do nothing.
   }

}

}

我发现的错误是，我已经在 onCreate() 方法中创建了所有他的东西。但我找不到我能做的替代事情......我不知道为什么这不起作用..

如果可能请帮忙

谢谢...

Answer 1

在 onSelectItem 中填充第二个微调器等等。