我必须开发一个登录表单android应用程序。在这里，我必须输入用户名和密码。如果正确，则获取属于该用户名的电子邮件并将其显示在文本视图中，如果用户名和密码错误，则显示登录失败消息。
这是我的网络服务代码：
public class Login {
public String authentication(String username,String password) {
String retrievedUserName = "";
String retrievedPassword = "";
String retrievedEmail = "";
String status = "";
try {
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/xcart-432pro","root","");
PreparedStatement statement = con.prepareStatement("SELECT * FROM xcart_customers WHERE login = '"+username+"'");
ResultSet result = statement.executeQuery();
while(result.next()){
retrievedUserName = result.getString("login");
retrievedPassword = result.getString("password");
retrievedEmail = result.getString("email");
}
if(retrievedUserName.equals(username)&&retrievedPassword.equals(password)&&!(retrievedUserName.equals("") && retrievedPassword.equals(""))){
status = "Success";
}
else {
status = "Login fail!!!";
}
}
catch(Exception e){
e.printStackTrace();
}
return status;
}
};
这是我的安卓代码：
public class CustomerLogin extends Activity {
private static final String SPF_NAME = "vidslogin";
private static final String USERNAME = "login";
private static final String PASSWORD = "password";
private static final String PREFS_NAME = null;
CheckBox chkRememberMe;
private String login;
String mGrandTotal,total,mTitle;
EditText username,userPassword;
private final String NAMESPACE = "http://xcart.com";
private final String URL = "http://10.0.0.75:8085/XcartLogin/services/Login?wsdl";
private final String SOAP_ACTION = "http://xcart.com/authentication";
private final String METHOD_NAME = "authentication";
private String uName;
/**Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.customer_login);
Bundle b = getIntent().getExtras();
total = b.getString("GrandTotal");
mTitle = b.getString("Title");
TextView grandtotal = (TextView) findViewById(R.id.grand_total);
grandtotal.setText("Welcome ," + mTitle );
chkRememberMe = (CheckBox) findViewById(R.id.rempasswordcheckbox);
username = (EditText) findViewById(R.id.tf_userName);
userPassword = (EditText) findViewById(R.id.tf_password);
SharedPreferences loginPreferences = getSharedPreferences(SPF_NAME, Context.MODE_PRIVATE);
username.setText(loginPreferences.getString(USERNAME, ""));
userPassword.setText(loginPreferences.getString(PASSWORD, ""));
Button login = (Button) findViewById(R.id.btn_login);
login.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
loginAction();
}
});
}
private void loginAction(){
boolean isUserValidated = true;
boolean isPasswordValidated = true;
SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
EditText username = (EditText) findViewById(R.id.tf_userName);
String user_Name = username.getText().toString();
EditText userPassword = (EditText) findViewById(R.id.tf_password);
String user_Password = userPassword.getText().toString();
//Pass value for userName variable of the web service
PropertyInfo unameProp =new PropertyInfo();
unameProp.setName("username");//Define the variable name in the web service method
unameProp.setValue(user_Name);//set value for userName variable
unameProp.setType(String.class);//Define the type of the variable
request.addProperty(unameProp);//Pass properties to the variable
//Pass value for Password variable of the web service
PropertyInfo passwordProp =new PropertyInfo();
passwordProp.setName("password");
passwordProp.setValue(user_Password);
passwordProp.setType(String.class);
request.addProperty(passwordProp);
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.setOutputSoapObject(request);
HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
try{
androidHttpTransport.call(SOAP_ACTION, envelope);
SoapPrimitive response = (SoapPrimitive)envelope.getResponse();
String status = response.toString();
TextView result = (TextView) findViewById(R.id.tv_status);
result.setText(response.toString());
if(status.equals("Success")) {
// ADD to save and read next time
String strUserName = username.getText().toString().trim();
String strPassword = userPassword.getText().toString().trim();
if (null == strUserName || strUserName.length() == 0) {
// showToast("Enter Your Name");
username.setError( "username is required!" );
isUserValidated = false;
}
if (null == strPassword || strPassword.length() == 0) {
// showToast("Enter Your Password");
isPasswordValidated = false;
userPassword.setError( "password is required!" );
}
if (isUserValidated = true && isPasswordValidated == true) {
if (chkRememberMe.isChecked()) {
SharedPreferences loginPreferences = getSharedPreferences(SPF_NAME, Context.MODE_PRIVATE);
loginPreferences.edit().putString(USERNAME, strUserName).putString(PASSWORD, strPassword).commit();
}
else {
SharedPreferences loginPreferences = getSharedPreferences(SPF_NAME, Context.MODE_PRIVATE);
loginPreferences.edit().clear().commit();
}
}
if (isUserValidated && isPasswordValidated) {
Intent intent = new Intent(CustomerLogin.this,PayPalIntegrationActivity.class);
intent.putExtra("GrandTotal", total);
intent.putExtra("Title", mTitle);
intent.putExtra("login",username.getText().toString());
startActivity(intent);
}
}
else {
LayoutInflater inflater = getLayoutInflater();
View layout = inflater.inflate(R.layout.toast_custom_layout,
(ViewGroup) findViewById(R.id.toast_layout_root));
Toast toast = new Toast(getApplicationContext());
toast.setGravity(Gravity.TOP, 0, 30);
toast.setDuration(Toast.LENGTH_LONG);
toast.setView(layout);
toast.show();
}
}
catch(Exception e){
}
}
}
如果登录成功，它必须在 textview 上显示电子邮件。我怎样才能做到这一点？