Spinner getSelectedItem（）返回null

Question

我在尝试访问spn_make上的getSelectedItem（）。toString（）时遇到NULL指针异常。

        CustomAdapter adapter = new CustomAdapter(InfoActivity.this);
            spn_make.setAdapter(adapter);
            Log.i("Count", spn_make.getAdapter().getCount()+"");
            spn_make.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

                        @Override
                        public void onItemSelected(AdapterView<?> a, View v,
                                int pos, long arg3) {
                            Toast.makeText(InfoActivity.this, spn_make.getSelectedItem().toString(), Toast.LENGTH_LONG).show();
                        }

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

                        }
                    });

请允许任何人帮助我。

Answer 1

要检索您必须编写的所选项目

a.getItemAtPosition(pos)

而不是spn_make.getSelectedItem()

Here是供参考的文档

更改此行代码

Toast.makeText(InfoActivity.this, spn_make.getSelectedItem().toString(), Toast.LENGTH_LONG).show();

到此：

Toast.makeText(InfoActivity.this, a.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show();

Answer 2

 if (Spinner.getSelectedItem() == null) {
            return;
        }else {
          Textview  tv = Spinner.getSelectedItem().toString();
        }