Question

这是实现AdapterView.OnItemSelectedListener的嵌套类。这提供了一个回调方法，当从Spinner中选择一个项目时，该方法通知我的应用程序。但我不知道如何将Selected String值传递给main活动？

public class CustomOnItemSelectedListener implements OnItemSelectedListener {

  public void onItemSelected(AdapterView<?> parent, View view, int pos,long id) {
    String selected = parent.getItemAtPosition(pos).toString();
  }

  @Override
  public void onNothingSelected(AdapterView<?> arg0) {
        // Do nothing.
  }

}

我在这样的主要活动中打电话

     public void addListenerOnSpinnerItemSelection() {
    spinner1 = (Spinner) findViewById(R.id.spinner1);
    spinner1.setOnItemSelectedListener(new CustomOnItemSelectedListener());
     // I need the selected value here.........
  }

Answer 1

如果您的监听器是相关活动的嵌套子类，您应该能够直接从活动中调用方法吗？

public void doSomething(String selected) {
    // do something here...
} 

public class YourItemSelectedListener implements OnItemSelectedListener {

    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
        String selected = parent.getItemAtPosition(pos).toString();
        doSomething(selected); // <=== THIS
    }

    public void onNothingSelected(AdapterView parent) {
        // Do nothing.
    }
}

Answer 2

在自定义SpinnerAdapter中，您可以将字符串设置为视图上的标记

 myFirstView.setTag("First");

并且在onItemSelected回调中，您可以从视图中获取标记。

 String selectedContent = (String)view.getTag();

android在主活动中获取选定的字符串

2 个答案: