检查是否选择了微调器中的项目

Question

我正在尝试为Android编写一个简单的应用程序。如果在微调器中没有选择任何项目，我想显示吐司信息。 。我用两个进度条来做这个。我试过下面给出的代码。

        String selection =sp.getSelectedItem().toString();
System.out.println("selected item "+selection);
if(selection=="[selection]")
    Toast.makeText(getActivity(), "gfdgdghfhf", Toast.LENGTH_SHORT).show();
return false;

Answer 1

use a string value as flag of selection



String status="not_selected";  

yourSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            public void onItemSelected(AdapterView<?> parent, View view,
                    int position, long id) {
                MyData d = items[position];

                status=d.getValue();
            }
   public void onNothingSelected(AdapterView<?> parent) {
      status="not_selected";
        }
    });

if(status.equqls("not_selected"){
            //show toast here 


                    }