我一直在尝试为我的应用程序的用户创建一个注册表单，但我似乎无法将新用户注册到我的数据库。编译时我没有错误，甚至没有显示错误对话框。我是PHP和MYSQLI的菜鸟。非常感谢帮助。 PS我正在使用Volley。
这是我的Register.java代码：
public class Register extends AppCompatActivity {
Button btnRegister;
EditText UserName, Name, Surname, Email, Bdate, Bmonth, Byear, HouseNr, StreetName, CityName,
PostalCode, CountryName, CountryMobileCode, Mobile, Password, ConPassword;
String userName, name, surname, email, bdate, bmonth, byear, houseNr, streetName, cityName,
postalCode, countryName, countryMobileCode, mobile, password, conPassword;
String reg_url = "http://xxxxxxxxxx/register.php";
String birthday, address, userMobile;
AlertDialog.Builder builder;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
btnRegister = (Button) findViewById(R.id.btnDetailsConfirm);
UserName = (EditText) findViewById(R.id.etUsername);
Name = (EditText) findViewById(R.id.etName);
Surname = (EditText) findViewById(R.id.etSurname);
Email = (EditText) findViewById(R.id.etEmail);
Bdate = (EditText) findViewById(R.id.etBday);
Bmonth = (EditText) findViewById(R.id.etBmonth);
Byear = (EditText) findViewById(R.id.etByear);
HouseNr = (EditText) findViewById(R.id.etHouseNr);
StreetName = (EditText) findViewById(R.id.etStreetName);
CityName = (EditText) findViewById(R.id.etCity);
PostalCode = (EditText) findViewById(R.id.etPostalCode);
CountryName = (EditText) findViewById(R.id.etCountry);
CountryMobileCode = (EditText) findViewById(R.id.etMobileExt);
Mobile = (EditText) findViewById(R.id.etMobileNr);
Password = (EditText) findViewById(R.id.etPassword);
ConPassword = (EditText) findViewById(R.id.etPasswordCon);
builder = new AlertDialog.Builder(Register.this);
btnRegister.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
userName = UserName.getText().toString();
name = Name.getText().toString();
surname = Surname.getText().toString();
email = Email.getText().toString();
bdate = Bdate.getText().toString();
bmonth = Bmonth.getText().toString();
byear = Byear.getText().toString();
houseNr = HouseNr.getText().toString();
streetName = StreetName.getText().toString();
cityName = CityName.getText().toString();
postalCode = PostalCode.getText().toString();
countryName = CountryName.getText().toString();
countryMobileCode = CountryMobileCode.getText().toString();
mobile = Mobile.getText().toString();
password = Password.getText().toString();
conPassword = ConPassword.getText().toString();
birthday = bdate+"/"+bmonth+"/"+byear;
address = houseNr+" "+streetName+", "+cityName;
userMobile = countryMobileCode+mobile;
if(userName.equals("")||name.equals("")||surname.equals("")||email.equals("")||bdate.equals("")||bmonth.equals("")||byear.equals("")||
houseNr.equals("")||streetName.equals("")||cityName.equals("")||postalCode.equals("")||countryName.equals("")||countryMobileCode.equals("")||
mobile.equals("")||password.equals("")||conPassword.equals(""))
{
builder.setTitle("Something has gone wrong...");
builder.setMessage("Please fill in all the fields.");
displayAlert("input_error");
}
else
{
if(!(password.equals(conPassword)))
{
builder.setTitle("Something has gone wrong...");
builder.setMessage("Passwords do not match.");
displayAlert("input_error");
}
else
{
StringRequest stringRequest = new StringRequest(Request.Method.POST, reg_url,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONArray jsonArray = new JSONArray(response);
JSONObject jsonObject = jsonArray.getJSONObject(0);
String code = jsonObject.getString("code");
String message = jsonObject.getString("message");
builder.setTitle("Server Response...");
builder.setMessage(message);
displayAlert(code);
} catch (JSONException e){
e.printStackTrace();
}
}
}, new Response.ErrorListener()
{
@Override
public void onErrorResponse(VolleyError error){
}
}){
@Override
protected Map<String,String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<String,String>();
params.put("user_name", userName);
params.put("name", name);
params.put("surname", surname);
params.put("email", email);
params.put("birthday", birthday);
params.put("address", address);
params.put("postal_code", postalCode);
params.put("city", cityName);
params.put("country", countryName);
params.put("mobile", userMobile);
params.put("password", password);
return params;
}
};
MySingleton.getInstance(Register.this).addToRequestQue(stringRequest);
}
}
}
});
}
public void displayAlert(final String code)
{
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
if (code.equals("input_error"))
{
Password.setText("");
ConPassword.setText("");
}
else if (code.equals("reg_success"))
{
finish();
}
else if(code.equals("reg_failed"))
{
UserName.setText("");
Name.setText("");
Surname.setText("");
Email.setText("");
Bdate.setText("");
Bmonth.setText("");
Byear.setText("");
HouseNr.setText("");
StreetName.setText("");
CityName.setText("");
PostalCode.setText("");
CountryName.setText("");
CountryMobileCode.setText("");
Mobile.setText("");
Password.setText("");
ConPassword.setText("");
}
}
});
AlertDialog alertDialog = builder.create();
alertDialog.show();
}
}
这是我的MySingleton.java代码：
public class MySingleton {
private static MySingleton mInstance;
private RequestQueue requestQueue;
private static Context mCtx;
private MySingleton(Context context)
{
mCtx = context;
requestQueue = getRequestQueue();
}
public RequestQueue getRequestQueue()
{
if(requestQueue==null)
{
requestQueue = Volley.newRequestQueue(mCtx.getApplicationContext());
}
return requestQueue;
}
public static synchronized MySingleton getInstance(Context context)
{
if(mInstance == null)
{
mInstance = new MySingleton(context);
}
return mInstance;
}
public <T> void addToRequestQue (Request<T> request)
{
requestQueue.add(request);
}
}
这是我的register.php代码：
<?php
$user_name = $_POST["user_name"];
$name = $_POST["name"];
$surname = $_POST["surname"];
$email = $_POST["email"];
$birthday = $_POST["birthday"];
$address = $_POST["address"];
$postal_code = $_POST["postal_code"];
$city = $_POST["city"];
$country = $_POST["country"];
$mobile = $_POST["mobile"];
$password = $_POST["password"];
$sql = "select * from user_info where email like '".$email."';";
$result = mysqli_query($con,$sql);
$response = array();
if(mysqli_num_rows($result)>0)
{
$code = "reg_failed";
$message = "User already exists....";
array_push($response, array("code"=>$code, "message"=>$message));
echo json_encode($response);
}
else
{
$sql = "insert into user_info values('".$user_name."','".$name."','".$surname."','".$email."','".$birthday."',
'".$address."','".$postal_code."','".$city."','".$country."','".$mobile."', '".$password."');";
$result = mysqli_query($con,$sql);
$code = "reg_success";
$message = "Thank you for registering with us! Now you can login.";
array_push($response, array("code"=>$code, "message"=>$message));
echo json_encode($response);
}
mysqli_close($con);
?>
：编辑：我的错误如下：
07-30 11:44:08.266 1824-2790/com.example.brian.loginnode E/Volley: [177] NetworkDispatcher.run: Unhandled exception java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference
at libcore.net.UriCodec.encode(UriCodec.java:132)
at java.net.URLEncoder.encode(URLEncoder.java:57)
at com.android.volley.Request.encodeParameters(Request.java:484)
at com.android.volley.Request.getBody(Request.java:470)
at com.android.volley.toolbox.HurlStack.addBodyIfExists(HurlStack.java:253)
at com.android.volley.toolbox.HurlStack.setConnectionParametersForRequest(HurlStack.java:227)
at com.android.volley.toolbox.HurlStack.performRequest(HurlStack.java:107)
at com.android.volley.toolbox.BasicNetwork.performRequest(BasicNetwork.java:97)
at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:114)
[ 07-30 11:44:10.011 81: 81 D/ ]
Socket deconnection
[ 07-30 11:44:12.009 81: 81 D/ ]
Socket deconnection
[ 07-30 11:44:14.004 81: 81 D/ ]
Socket deconnection
[ 07-30 11:44:16.011 81: 81 D/ ]
Socket deconnection
[ 07-30 11:44:18.006 81: 81 D/ ]
Socket deconnection
[ 07-30 11:44:20.003 81: 81 D/ ]
Socket deconnection
答案 0 :(得分：0)
基本上，你的onErrorResponse方法应该做一些事情来记录错误信息（例如，显示一个弹出窗口 - 类似于displayAlert方法）。此外，由于您的异常处理程序只执行e.printStackTrace（），如果抛出任何异常，它们将被打印到控制台 - 无论在哪里。因此，您可能还想包含一些警告对话框而不是e.printStackTrace（） - 至少显示一个带有e.getMessage（）的警报。