将微调器所选项目从片段传递到活动[重复]

有两种方法可以做到

1) 铸造

public class MyActivity extends AppCompatActivity {

  public void setData(String value){
        // do whatever with the data
  }
}

public class MyFragment extends Fragment{

   public void someMethod(){
     ((MyActivity)getActivity).setData(your_data);
   }
}

界面

public class MyActivity extends AppCompatActivity implements SpinnerListener{

  @Override
  public void onSpinnerItemSelected(String value){
        // do whatever with the data
  }

  public interface SpinnerListener {
    void onSpinnerItemSelected(String value);
  }
}

public class MyFragment extends Fragment {

    private SpinnerListener spinnerListener;

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if(context instanceOf MyActivity)
           spinnerListener = ((MyActivity)context);
    }

   public void someMethod() {
      if(spinnerListener != null)
        spinnerListener.onSpinnerItemSelected(your_data); 
   }
}