在android数组列表中没有得到验证

Question

 sbtbtn.setOnClickListener(new View.OnClickListener()

//尝试验证来自CustomAdpater的此数组列表，如果此数组列表为空，则代码将返回并显示Toast，但它显示已插入的Toast数据

                          {
                              @Override
                              public void onClick(View v) {

                                  final String dbName = "/data/data/" + getClass().getPackage().getName() + "/sync.bdb.db";
                                  if (productListAdapter.getList().toString().equals("")) {
                                      Toast.makeText(getApplicationContext(), "Please insert data into list", Toast.LENGTH_SHORT).show();
                                      return;
                                  }
                                  helper.savePurchaseList(productListAdapter.getList(), invoiceNo.getText().toString());
                                  Toast.makeText(getApplicationContext(), "Data Inserted", Toast.LENGTH_SHORT).show();

                              }
                          }

);