spinner_button.setOnItemSelectedListener(new OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?>arg0, View view, int arg2, long arg3) {

            String selected_val=spinner_button.getSelectedItem().toString();

            Toast.makeText(getApplicationContext(), selected_val ,
                    Toast.LENGTH_SHORT).show();
        }

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

        }
    });

}

一行版本:

String text = ((Spinner)findViewById(R.id.spinner)).getSelectedItem().toString();

更新: 如果使用SDK 26(或更新版本)编译项目，则可以删除强制转换。

String text = findViewById(R.id.spinner).getSelectedItem().toString();

Spinner返回数组的整数值。必须根据索引检索字符串值。

Spinner MySpinner = (Spinner)findViewById(R.id.spinner);
Integer indexValue = MySpinner.getSelectedItemPosition();

您必须使用索引和适配器来查找您拥有的文本

请看Spinner的例子

public class MyOnItemSelectedListener implements OnItemSelectedListener {

    public void onItemSelected(AdapterView<?> parent,
        View view, int pos, long id) {
      Toast.makeText(parent.getContext()), "The planet is " +
          parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show();
    }

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

Spinner spinner = (Spinner) findViewById(R.id.yourspinnerid);
String text = spinner.getSelectedItem().toString();

TextView textView = (TextView)mySpinner.getSelectedView();
String result = textView.getText().toString();