here is my logcat file image我收到空对象引用错误而不是初始化变量？
这是我的java代码
Customer.java
package com.example.ishagoyal.lunchbox;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
public class customer extends Activity {
public EditText customer_name,email,password,confirm_password,contact_no,house_no,city,state ;
public Button submit;
public TextView registerErrorMsg;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_customer);
email=(EditText)findViewById(R.id.editText);
password=(EditText)findViewById(R.id.editText3);
confirm_password=(EditText)findViewById(R.id.editText4);
contact_no=(EditText)findViewById(R.id.editText6);
customer_name=(EditText)findViewById(R.id.editText5);
house_no=(EditText)findViewById(R.id.editText7);
city=(EditText)findViewById(R.id.editText8);
state=(EditText)findViewById(R.id.editText9);
submit=(Button)findViewById(R.id.button);
submit.setOnClickListener(new View.OnClickListener() {
//submit button click event... a toast is set to alert when the fields are empty
@Override
public void onClick(View v) {
if((!customer_name.getText().toString().equals(""))&&(!house_no.getText().toString().equals(""))&&(!city.getText().toString().equals(""))&&(!state.getText().toString().equals(""))&&(!contact_no.getText().toString().equals(""))&&(!email.getText().toString().equals(""))&&(!password.getText().toString().equals(""))&&(!confirm_password.getText().toString().equals("")))
{
if(password.getText().toString().equals(confirm_password.getText().toString()))
{
NetAsync(v);
new CustomerUser().execute();
}else{
Toast.makeText(getApplicationContext(), "Password does not match", Toast.LENGTH_SHORT).show();
}
}
else{
Toast.makeText(getApplicationContext(), "One or more fields are empty", Toast.LENGTH_SHORT).show();
}
}
});
}
public void NetAsync(View view)
{
//checking network connection
if (isNetworkStatusAvailable(getApplicationContext()))
{
registerErrorMsg.setText("Error in Network connection");
}
}
public static boolean isNetworkStatusAvailable(Context context)
{
ConnectivityManager connectivityManager =(ConnectivityManager)context.getSystemService(CONNECTIVITY_SERVICE);
if(connectivityManager!=null)
{
NetworkInfo networkInfo=connectivityManager.getActiveNetworkInfo();
if(networkInfo!=null)
{
if(networkInfo.isConnected())
return true;
}
}
return false;
}
/*Async task to set and get data to Mysql database through JSON response*/
class CustomerUser extends AsyncTask<Void,Void,String> {
ProgressDialog dialog;
String cname, cno, cmail,res, cpswd, cconfirm_password, chouse_no, ccity, cstate;
@Override
protected void onPreExecute() {
dialog = ProgressDialog.show(customer.this, "Contacting Servers", "Registering...");
super.onPreExecute();
cname = customer_name.getText().toString();
cno = contact_no.getText().toString();
cmail = email.getText().toString();
cpswd = password.getText().toString();
cconfirm_password = confirm_password.getText().toString();
chouse_no = house_no.getText().toString();
ccity = city.getText().toString();
cstate = state.getText().toString();
}
@Override
protected String doInBackground(Void... params) {
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost("http://10.0.2.2/webservice/Register.php");
List<BasicNameValuePair> paramsForhttp = new ArrayList<BasicNameValuePair>();
paramsForhttp.add(new BasicNameValuePair("tag", "register"));
paramsForhttp.add(new BasicNameValuePair("name", cname));
paramsForhttp.add(new BasicNameValuePair("number", cno));
paramsForhttp.add(new BasicNameValuePair("email", cmail));
paramsForhttp.add(new BasicNameValuePair("password", cpswd));
paramsForhttp.add(new BasicNameValuePair("confirm_password", cconfirm_password));
paramsForhttp.add(new BasicNameValuePair("house_no", chouse_no));
paramsForhttp.add(new BasicNameValuePair("city", ccity));
paramsForhttp.add(new BasicNameValuePair("state", cstate));
try {
post.setEntity(new UrlEncodedFormEntity(paramsForhttp));
HttpResponse response = client.execute(post);
HttpEntity entity = response.getEntity();
InputStream stream = entity.getContent();
res = convertStreamToString(stream);
Log.e("Response", res);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
JSONObject obj;
try {
obj = new JSONObject(res);
if (obj.getString("error").equalsIgnoreCase("false")) {
Toast.makeText(getApplicationContext(), "REGISTRATION SUCCESSFUL", Toast.LENGTH_LONG).show();
Intent in = new Intent(getApplicationContext(), loaction.class);
startActivity(in);
finish();
} else {
Toast.makeText(getApplicationContext(), obj.getString("error_msg"), Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
e.printStackTrace();
}
dialog.cancel();
super.onPostExecute(result);
}
private String convertStreamToString(InputStream stream) {
Log.i("convertstream method", "hello");
InputStream is = stream;
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_customer, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
这是我的注册php文件 regiter.php
<?php
require_once 'DBWork.php';
$response;
global $list;
$conn=new Database();
$conn->construct();
$response=$conn->Check();
$response=FALSE;
if(isset($_POST['tag'])=='register')
{
if(($_POST['name']!=null)&&($_POST['number']!=null)&&($_POST['email']!=null)&&($_POST['password']!=null)&&($_POST['confirm_password']!=null)&&($_POST['house_no']!=null)&&($_POST['city']!=null)&&($_POST['state']!=null))
{
// receiving the post params
$name = $_POST['name'];
$email = $_POST['email'];
$number=$_POST['number'];
$confirm_password=$_POST['confirm_password'];
$password = $_POST['password'];
$house_no=$_POST['house_no'];
$city=$_POST['city'];
$state=$_POST['state'];
// check if user is already existed with the same email
if ($conn->isUserExisted($email)) {
// user already existed
$response["error"] = TRUE;
$response["error_msg"] = "User already existed with " . $email;
echo json_encode($response);
} else {
$user=$conn->Add($name,$number,$email,$password,$confirm_password,$house_no,$city,$state);
if ($user) {
// user stored successfully
$response["error"] = FALSE;
$response["user"]["name"] = $user['Name'];
$response["user"]["email"] = $user['Email_id'];
$response["user"]["number"] = $user['Contact_no'];
echo json_encode($response);
} else {
// user failed to store
$response["error"] = TRUE;
$response["error_msg"] = "Unknown error occurred in registration!";
echo json_encode($response);
}
}
}
} else {
$response["error"] = TRUE;
$response["error_msg"] = "Required parameters (name, contact number,email or password) is missing!";
echo json_encode($response);
}
?>
连接php文件 DBWork.php
<?php
class Database
{
private $db;
function construct()
{
$servername='localhost';
$username='root';
$password='';
$dbname='LunchBox';
$this->db=mysqli_connect($servername, $username, $password, $dbname);
}
function Check()
{
if($this->db)
return true;
else {
return false;
}
}
function Add($name,$number,$email,$password,$confirm_pswd,,$house_no,$city,$state)
{
$stmt=$this->db->prepare("INSERT INTO customer_table(Email_id,Password,Confirm_password,Customer_Name,Contact_no,House_no,City,State) VALUES(?,?,?,?,?,?,?,?)");
$stmt->bind_param("ssssssss",$name,$number,$email,$password,$confirm_pswd,$house_no,$city,$state);
if($stmt->execute())
return true;
else {
return false;
}
}
/**
* Get user by email and password
*/
function getUserByEmailAndPassword($email, $password) {
$stmt = $this->db->prepare("SELECT * FROM customer_table WHERE Email_id =?");
$stmt->bind_param("s", $email);
if ($stmt->execute()) {
$user = $stmt->get_result()->fetch_assoc();
$stmt->close();
return $user;
} else {
return NULL;
}
}
/**
* Check user is existed or not
*/
function isUserExisted($email) {
$stmt = $this->db->prepare("SELECT Email_id from customer_table WHERE Email_id = ?");
if($stmt){
$stmt->bind_param("s", $email);
$stmt->execute();
$stmt->store_result();
if ($stmt->num_rows > 0) {
// user existed
$stmt->close();
return true;
} else {
// user not existed
$stmt->close();
return false;
}
}
else{
var_dump($this->db->error);
}
}
function forgotPassword($email) {
$stmt = $this->db->prepare("SELECT Password FROM customer_table WHERE Email_id =?");
if($stmt)
{
$stmt->bind_param("s", $email);
if ($stmt->execute()) {
$user = $stmt->get_result()->fetch_assoc();
$stmt->close();
return $user;
} else
{
return NULL;
}
}
else{
var_dump($this->db->error);
}
}
}
?>
[1]: http://i.stack.imgur.com/iAwyk.jpg