我是android新手这是我第一个使用mysql数据库的应用程序。我已经完成了登录和忘记密码的活动，但是在注册时遇到了问题。我遇到了nullpointexception，我不知道如何摆脱它。我正在分享我的注册代码。java请指导我。
public class Resgistration3 extends AppCompatActivity {
private static final String TAG = MainActivity.class.getSimpleName();
private ProgressDialog pDialog;
private SessionManager session;
private SQLiteHandler db;
TextView click;
EditText et_email, et_password;
SharedPreferences preferences, preferences1, preferences2;
Button btn_signup;
SharedPreferences preferences3;
SharedPreferences.Editor editor3;
EditText et_business, et_Ntn, et_Strn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_resgistration3);
preferences3 = getSharedPreferences("MyPrefs2", MODE_PRIVATE);
et_business = (EditText) findViewById(R.id.et_business);
et_Ntn = (EditText) findViewById(R.id.et_Ntn);
et_Strn = (EditText) findViewById(R.id.et_Strn);
btn_signup = (Button) findViewById(R.id.btn_signup);
preferences = getSharedPreferences("MyPrefs", MODE_PRIVATE);
preferences1 = getSharedPreferences("MyPrefs1", MODE_PRIVATE);
preferences2 = getSharedPreferences("MyPrefs2", MODE_PRIVATE);
et_email = (EditText) findViewById(R.id.et_email);
et_password = (EditText) findViewById(R.id.et_password);
btn_signup = (Button) findViewById(R.id.btn_signup);
click = (TextView) findViewById(R.id.txt_Click);
pDialog = new ProgressDialog(this);
pDialog.setCancelable(false);
// SQLite database handler
db = new SQLiteHandler(getApplicationContext());
// Session manager
session = new SessionManager(getApplicationContext());
// Check if user is already logged in or not
if (session.isLoggedIn()) {
// User is already logged in. Take him to main activity
Intent intent = new Intent(Resgistration3.this, Screen1.class);
startActivity(intent);
finish();
}
// Login button Click Event
btn_signup.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
final String userName = preferences.getString("Name", null);
final String userEmail = preferences.getString("Email", null);
final String userPassword = preferences.getString("Password", null);
final String userMobile = preferences.getString("Mobile", null);
final String userCity = preferences1.getString("City", null);
final String userDob = preferences1.getString("Dob", null);
final String userTax = preferences1.getString("Tax", null);
final String userCnic = preferences1.getString("Cnic", null);
final String userBusiness = preferences2.getString("Business", null);
final String userNtn = preferences2.getString("Ntn", null);
registerUser(userName,userEmail,userPassword,userMobile,userCity,userDob,userTax,userCnic,userBusiness,userNtn);
/*Toast.makeText(getApplicationContext(),userName,Toast.LENGTH_LONG).show();*/
}
});
}
private void registerUser(final String userName, final String userEmail, final String userPassword, final String userMobile, final String userCity, final String userDob, final String userTax, final String userCnic, final String userBusiness, final String userNtn) {
// Tag used to cancel the request
String tag_string_req = "req_register";
StringRequest strReq = new StringRequest(Request.Method.POST,
AppConfig.URL_REGISTER, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.d(TAG, "Register Response: " + response.toString());
/* try {
JSONObject jObj = new JSONObject(response);
boolean error = jObj.getBoolean("error");
if (!error) {
// User successfully stored in MySQL
Toast.makeText(getApplicationContext(),
"User successfully registered. Try login now!", Toast.LENGTH_LONG).show();
// Launch login activity
Intent intent = new Intent(Resgistration3.this, WithoutLogin.class);
startActivity(intent);
finish();
} else {
// Error occurred in registration. Get the error
// message
String errorMsg = jObj.getString("error_msg");
Toast.makeText(getApplicationContext(),errorMsg, Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
e.printStackTrace();
}
* /
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e(TAG, "Registration Error: " + error.getMessage());
Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_LONG).show();
}
}) {
@Override
protected Map<String, String> getParams() {
// Posting params to register url
Map<String, String> params = new HashMap<String, String>();
params.put("txtemail", userEmail);
params.put("fname", userName);
params.put("city", userCity);
params.put("txtpassword", userPassword);
params.put("mphone", userMobile);
params.put("ntn", userNtn);
params.put("cnic", userCnic);
params.put("bname", userBusiness);
params.put("tpay", userTax);
params.put("dob", userDob);
return params;
}
};
// Adding request to request queue
AppController.getInstance().addToRequestQueue(strReq, tag_string_req);
}
}php代码：
<?PHP
$use_real_escapes = false;
require_once("connection.php");
error_reporting(0);
header( "Content-type: text/json" );
if (isset($_POST['fname'])){
$fnameq = mysqli_real_escape_string( $conn, $_POST['fname']);
$uname = mysqli_real_escape_string( $conn,$_POST['txtname'] );
$email = mysqli_real_escape_string( $conn,$_POST['txtemail'] );
$city = mysqli_real_escape_string( $conn,$_POST['city'] );
$hash = mysqli_real_escape_string( $conn,$_POST['txtpassword'] );
$sk = "I6PnEPbQNLslYMj7ChKxDJ2yenuHLkXn";
$password = hash('sha512', $hash.$sk);
$phone = mysqli_real_escape_string( $conn,$_POST['phone'] );
$mobile = mysqli_real_escape_string( $conn,$_POST['mphone'] );
$ntn = mysqli_real_escape_string( $conn,$_POST['ntn'] );
$strn = mysqli_real_escape_string( $conn,$_POST['strn'] );
$cnic = mysqli_real_escape_string( $conn,$_POST['cnic'] );
$bname = mysqli_real_escape_string( $conn, $_POST['bname'] );
$tpay = mysqli_real_escape_string( $conn,$_POST['tpay'] );
$dob = mysqli_real_escape_string( $conn,$_POST['dob'] );
//file uploading//image name hre
$image = $_FILES['photo']['name'];
//image temp name
$temp_name = $_FILES['photo']['tmp_name'];
//uploading image to folder
move_uploaded_file($temp_name,"uploads/salary/$image");
$check = "SELECT * FROM `tbl_users` where username = '$uname' or email = '$email'";
$crr = mysqli_query($conn , $check);
if (mysqli_num_rows($crr) <=0){
$query ="INSERT INTO `tbl_users` (username, email, password,last_login,created)
VALUES ('$uname', '$email', '$password',NOW(),NOW());";
$result = mysqli_query($conn, $query);
$select ="Select user_id from tbl_users where username = '$uname' ";
$sr = mysqli_query($conn, $select);
$row = mysqli_fetch_assoc($sr);
$userid = $row['user_id'];
$query2 = "INSERT INTO `tbl_account_details` (`user_id`, `fullname`, `company`, `city`, `country`, `locale`, `address`, `phone`, `phone_2`, `mobile`, `mobile_2`, `skype`, `language`, `departments_id`, `avatar`, `ntn`, `ntn_2`, `cnic`, `business_name`, `researcher`, `age`, `file_no`, `status`, `gender`, `sale_tax_no`, `dob`, `first_name`, `last_name`, `bus_emp_name`, `bus_emp_add`, `resi_add`, `rto`, `zone`, `consultancy`, `name_consultant`, `tax_category`, `activity`, `name_of_city`, `fbr_password`, `fbr_pincode`, `sbr_password`, `email_Add`) VALUES ('$userid', '$fnameq', 'NULL', '$city', 'NULL', 'en_US', 'NULL', '$phone', 'NULL', '$mobile', 'NULL', 'NULL', 'english', '0', '$image', '$ntn', 'NULL', '$cnic', '$bname', '$tpay', '$dob', 'NULL', 'NULL', 'NULL', 'NULL', '$dob', 'NULL', 'NULL', 'NULL', 'NULL', 'NULL', 'NULL', 'NULL', 'NULL', 'NULL', 'NULL', 'NULL', 'NULL', 'NULL', 'NULL', 'NULL', 'NULL');";
$result2 = mysqli_query($conn, $query2);
if($result2 > 0){
$response = mysqli_fetch_array( $sr );
$response["error"] = FALSE;
$response["response1"]["user-id"] = $row["user_id"];
$response['status'] = 'Registration Successful,Wait For Admin To Activate Your Account';
$json = json_encode($response);
echo $json;
exit;
}
else{
$response['status'] = 'Registration Unsuccessful';
$json = json_encode($response);
echo $json;
exit;
}
}
else{
$response['status'] = 'Username Already Exists';
$json = json_encode($response);
echo $json;
exit;
}
}
?>我使用相同的代码登录和它的工作！！请引导我，这样我就可以重新开始工作了！！
错误日志：
01-09 15:49:12.824 7571-7622/? E/Volley: [292] 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 java.net.URLEncoder.encode(URLEncoder.java:205)
at com.android.volley.Request.encodeParameters(Request.java:450)
at com.android.volley.Request.getBody(Request.java:436)
at com.android.volley.toolbox.HurlStack.addBodyIfExists(HurlStack.java:260)
at com.android.volley.toolbox.HurlStack.setConnectionParametersForRequest(HurlStack.java:234)
at com.android.volley.toolbox.HurlStack.performRequest(HurlStack.java:107)
at com.android.volley.toolbox.BasicNetwork.performRequest(BasicNetwork.java:96)
at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:112)
01-09 15:49:12.825 7571-7571/? E/MainActivity: Registration Error: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference
1条答案
按热度按时间cetgtptt1#
在onerrorresponse（）中尝试以下代码
而不是
使用