Question

我正在试图在Android中创建并将客户对象保存到SQLite，

这是我的客户类

public class Customer {

    private int id;
    private String Name;
    private String EmailAddress;
    private String Phone;
    private Double InitialValue;
    private Double BalanceOnCard = 0.00;
    private String CardUID;
    private Date EnrollmentDate = new Date();
    private Date LastTransactionDate = new Date();

    public Customer(){}

在我的Activity中，我创建了像这样的私有变量

public class EnrollmentActivity extends MenuOnlyActivity {

    private CustomerSQLiteHelper db;
    private final String TAG = "Customer_Add";

    Button submitButton;
    Button cancelButton;
    private EditText customerNameEditText;
    private EditText customerEmailEditText;
    private EditText customerPhoneEditText;
    private EditText valueToAddEditText;    

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_enrollment);

        submitButton = (Button) findViewById(R.id.buttonEnrollment);
        cancelButton = (Button) findViewById(R.id.CancelEnrollment);
        customerNameEditText = (EditText) findViewById(R.id.editTextCustomerName);
        customerEmailEditText = (EditText) findViewById(R.id.editTextCustomerEmailAddress);
        customerPhoneEditText = (EditText) findViewById(R.id.editTextBusinessPhoneNumber);
        valueToAddEditText = (EditText) findViewById(R.id.editTextValueToAdd);

这里是SubmitButton监听器，它在这个代码块中失败，它没有达到调用DatabaseHelper来保存Customer对象的地步，它在创建一个空白的Customer对象并开始设置后立即失败了实例变量。

Log.i(TAG, "Entering Submit Button event");
        submitButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {
                if (customerNameEditText.getText().length() == 0) {
                    Toast.makeText(EnrollmentActivity.this, "Enter Customer's name", Toast.LENGTH_SHORT).show();
                    customerNameEditText.requestFocus();
                    return;
                }

                Log.i(TAG, "Create new customer");
                //Create new customer object 
                Customer enteredCustomer = new Customer();
                Log.i(TAG, "Created blank customer object");

                Log.i(TAG, "populate the new customer object");
                //Populate the values of the new object with the values entered in the screen
                enteredCustomer.setId(1);
                enteredCustomer.setName(customerNameEditText.getText().toString());
                enteredCustomer.setEmailAddress(customerEmailEditText.getText().toString());
                enteredCustomer.setPhone(customerPhoneEditText.getText().toString());   

                String enteredValueSting = valueToAddEditText.getText().toString();
                double storedValue = Double.parseDouble(enteredValueSting); //convert String to Double
                enteredCustomer.setInitialValue(storedValue);
                enteredCustomer.setCardUID("ABC123");

                Log.i(TAG, "Creating DB Instance");
                db = new CustomerSQLiteHelper(EnrollmentActivity.this);
                Log.i(TAG, "Created Database instance");
                if (db.create(enteredCustomer) != -1) {
                    Toast.makeText(EnrollmentActivity.this,"Add Customer Successful",Toast.LENGTH_SHORT).show();
                    customerNameEditText.getText().clear();
                    customerEmailEditText.getText().clear();
                    customerPhoneEditText.getText().clear();
                    valueToAddEditText.getText().clear();
                } else {
                    Toast.makeText(EnrollmentActivity.this, "Add Customer failed", Toast.LENGTH_SHORT).show();
                }

            }
        });

错误消息到处都是，它始终提供祝酒词＃34;不幸的是PROJECT_NAME停止了＃34;当前控制台错误是＆＃34;已建立的连接已被主机中的软件中止 java.io.IOException：已建立的连接被主机中的软件中止了＃34;我已经重启了Eclipse和Emulator几次。任何帮助/建议将不胜感激。

Answer 1

经过多次拔毛之后，我做了两件事来隔离并解决问题，首先我创建了一个默认构造函数并将参数初始化为合理的默认值，对于字符串为null，对于Ints为0，然后我重命名了所有的XML ID以匹配我在Activity中创建的Java变量。现在，我可以创建Customer对象的实例并持久保存到数据库。

无法在Android中创建和保存客户对象

1 个答案: