安卓登录注册php-mysql，注册表单时强制关闭

Question

我累了，不知道如何修复我的应用程序。。我的问题是，每次我注册并填充edittext，直到点击"注册"按钮，我的应用程序都会强制关闭，但数据是在mysql中输入的。。这是我的代码：

RegisterActivity.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
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.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.latihan.Utils.DatabaseHandler;
import com.latihan.Utils.UserFunctions;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
public class RegisterActivity extends AppCompatActivity {

private static String KEY_SUCCESS = "success";
private static String KEY_UID = "uid";
private static String KEY_FIRSTNAME = "fname";
private static String KEY_LASTNAME = "lname";
private static String KEY_USERNAME = "uname";
private static String KEY_EMAIL = "email";
private static String KEY_CREATED_AT = "created_at";
private static String KEY_ERROR = "error";

EditText inputFirstName;
EditText inputLastName;
EditText inputUsername;
EditText inputEmail;
EditText inputPassword;
Button btnRegister;
TextView registerErrorMsg;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
inputFirstName = (EditText) findViewById(R.id.fname);
inputLastName = (EditText) findViewById(R.id.lname);
inputUsername = (EditText) findViewById(R.id.uname);
inputEmail = (EditText) findViewById(R.id.email);
inputPassword = (EditText) findViewById(R.id.pword);
btnRegister = (Button) findViewById(R.id.register);
registerErrorMsg = (TextView) findViewById(R.id.register_error);


Button login = (Button) findViewById(R.id.bktologin);
login.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent myIntent = new Intent(view.getContext(), LoginActivity.class);
startActivityForResult(myIntent, 0);
finish();
}
});

btnRegister.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (  ( !inputUsername.getText().toString().equals("")) && ( !inputPassword.getText().toString().equals("")) && ( !inputFirstName.getText().toString().equals("")) && ( !inputLastName.getText().toString().equals("")) && ( !inputEmail.getText().toString().equals("")) )
{
if ( inputUsername.getText().toString().length() > 4 ){
NetAsync(view);
}
else
{
Toast.makeText(getApplicationContext(),
"Username should be minimum 5 characters", Toast.LENGTH_SHORT).show();
}
}
else
{
Toast.makeText(getApplicationContext(),
"One or more fields are empty", Toast.LENGTH_SHORT).show();
}
}
});
}

private class NetCheck extends AsyncTask<String,String,Boolean>
{
private ProgressDialog nDialog;
@Override
protected void onPreExecute(){
super.onPreExecute();
nDialog = new ProgressDialog(RegisterActivity.this);
nDialog.setMessage("Loading..");
nDialog.setTitle("Checking Network");
nDialog.setIndeterminate(false);
nDialog.setCancelable(true);
nDialog.show();
}
@Override
protected Boolean doInBackground(String... args){

ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnected()) {
try {
URL url = new URL("http://www.google.com");
HttpURLConnection urlc = (HttpURLConnection) url.openConnection();
urlc.setConnectTimeout(3000);
urlc.connect();
if (urlc.getResponseCode() == 200) {
return true;
}
} catch (MalformedURLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return false;
}
@Override
protected void onPostExecute(Boolean th){
if(th == true){
nDialog.dismiss();
new ProcessRegister().execute();
}
else{
nDialog.dismiss();
registerErrorMsg.setText("Error in Network Connection");
}
}
}


private class ProcessRegister extends AsyncTask<String, String, JSONObject> {
/**
* Defining Process dialog
**/
private ProgressDialog pDialog;
String email,password,fname,lname,uname;
@Override
protected void onPreExecute() {
super.onPreExecute();
inputUsername = (EditText) findViewById(R.id.uname);
inputPassword = (EditText) findViewById(R.id.pword);
fname = inputFirstName.getText().toString();
lname = inputLastName.getText().toString();
email = inputEmail.getText().toString();
uname= inputUsername.getText().toString();
password = inputPassword.getText().toString();
pDialog = new ProgressDialog(RegisterActivity.this);
pDialog.setTitle("Contacting Servers");
pDialog.setMessage("Registering ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected JSONObject doInBackground(String... args) {

UserFunctions userFunction = new UserFunctions();
JSONObject json = userFunction.registerUser(fname, lname, email, uname, password);
return json;

}
@Override
protected void onPostExecute(JSONObject json) {
try {
if (json.getString(KEY_SUCCESS) != null) {
registerErrorMsg.setText("");
String res = json.getString(KEY_SUCCESS);
String red = json.getString(KEY_ERROR);
if(Integer.parseInt(res) == 1){
pDialog.setTitle("Getting Data");
pDialog.setMessage("Loading Info");
registerErrorMsg.setText("Successfully Registered");

DatabaseHandler db = new DatabaseHandler(getApplicationContext());
JSONObject json_user = json.getJSONObject("user");

UserFunctions logout = new UserFunctions();
logout.logoutUser(getApplicationContext());
db.addUser(json_user.getString(KEY_FIRSTNAME),json_user.getString(KEY_LASTNAME),json_user.getString(KEY_EMAIL),json_user.getString(KEY_USERNAME),json_user.getString(KEY_UID),json_user.getString(KEY_CREATED_AT));
/**
* Stores registered data in SQlite Database
* Launch Registered screen
**/
Intent registered = new Intent(getApplicationContext(), RegistredActivity.class);

registered.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
pDialog.dismiss();
startActivity(registered);

finish();
}
else if (Integer.parseInt(red) ==2){
pDialog.dismiss();
registerErrorMsg.setText("User already exists");
}
else if (Integer.parseInt(red) ==3){
pDialog.dismiss();
registerErrorMsg.setText("Invalid Email id");
}
}

else{
pDialog.dismiss();
registerErrorMsg.setText("Error occured in registration");
}

} catch (JSONException e) {
e.printStackTrace();

}
}}
public void NetAsync(View view){
new NetCheck().execute();
}

JSONParse.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONObject getJSONListfromURL(String url,List<NameValuePair> params){
//initialize
InputStream is = null;
String result = "";
JSONObject jArray = null;
//http post
try{
DefaultHttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
httppost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
}catch(Exception e){
Log.e("log_tag", "Error in http connection "+e.toString());
}
//convert response to string
try{
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "n");
}
is.close();
result=sb.toString();
}catch(Exception e){
Log.e("log_tag", "Error converting result "+e.toString());
}
//try parse the string to a JSON object
try{
jArray = new JSONObject(result);
}catch(JSONException e){
Log.e("log_tag", "Error parsing data "+e.toString());
}
return jArray;
}
public JSONObject getJSONFromUrl(String url, List<NameValuePair> params) {
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "n");
}
is.close();
json = sb.toString();
Log.e("JSON", json);
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
public void SendJSONToURL(String url,List<NameValuePair> params){
//http post
try{
DefaultHttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
httppost.setEntity(new UrlEncodedFormEntity(params));
httpclient.execute(httppost);
}catch(Exception e){
Log.e("log_tag", "Error in http connection "+e.toString());
}
}
}

这是我的logcat

>06-10 14:34:36.120 9915-9950/com.app.latihan E/JSON: <br />
<font size='1'><table class='xdebug-error xe-deprecated' dir='ltr' border='1' cellspacing='0' cellpadding='1'>
<tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> Deprecated: mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in C:wampwwwaaincludeDB_Connect.php on line <i>18</i></th></tr>
<tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
<tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'>Memory</th><th align='left' bgcolor='#eeeeec'>Function</th><th align='left' bgcolor='#eeeeec'>Location</th></tr>
<tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.4669</td><td bgcolor='#eeeeec' align='right'>151232</td><td bgcolor='#eeeeec'>{main}(  )</td><td title='C:wampwwwaaindex.php' bgcolor='#eeeeec'>..index.php<b>:</b>0</td></tr>
<tr><td bgcolor='#eeeeec' align='center'>2</td><td bgcolor='#eeeeec' align='center'>0.6559</td><td bgcolor='#eeeeec' align='right'>171112</td><td bgcolor='#eeeeec'>DB_Functions->__construct(  )</td><td title='C:wampwwwaaindex.php' bgcolor='#eeeeec'>..index.php<b>:</b>13</td></tr>
<tr><td bgcolor='#eeeeec' align='center'>3</td><td bgcolor='#eeeeec' align='center'>0.7570</td><td bgcolor='#eeeeec' align='right'>174872</td><td bgcolor='#eeeeec'>DB_Connect->connect(  )</td><td title='C:wampwwwaaincludeDB_Functions.php' bgcolor='#eeeeec'>..DB_Functions.php<b>:</b>13</td></tr>
<tr><td bgcolor='#eeeeec' align='center'>4</td><td bgcolor='#eeeeec' align='center'>0.7661</td><td bgcolor='#eeeeec' align='right'>175384</td><td bgcolor='#eeeeec'><a href='http://www.php.net/function.mysql-connect' target='_new'>mysql_connect</a>
(  )</td><td title='C:wampwwwaaincludeDB_Connect.php' bgcolor='#eeeeec'>..DB_Connect.php<b>:</b>18</td></tr>
</table></font>
{"tag":"register","success":1,"error":0,"user":{"fname":"test1","lname":"test2","email":"[e-mail]","uname":"test4","uid":"575a6d8b4cc012.68231874","created_at":"2016-06-10 14:34:35"}}
06-10 14:34:36.120 9915-9950/com.app.latihan E/JSON Parser: Error parsing data org.json.JSONException: Value <br of type java.lang.String cannot be converted to JSONObject
06-10 14:34:36.156 9915-9915/com.app.latihan D/AndroidRuntime: Shutting down VM
>--------- beginning of crash
06-10 14:34:36.156 9915-9915/com.app.latihan E/AndroidRuntime: FATAL EXCEPTION: main
   Process: com.app.latihan, PID: 9915
   java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String org.json.JSONObject.getString(java.lang.String)' on a null object reference
       at com.app.latihan.RegisterActivity$ProcessRegister.onPostExecute(RegisterActivity.java:229)
       at com.app.latihan.RegisterActivity$ProcessRegister.onPostExecute(RegisterActivity.java:186)
       at android.os.AsyncTask.finish(AsyncTask.java:636)
       at android.os.AsyncTask.access$500(AsyncTask.java:177)
       at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:653)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:135)
       at android.app.ActivityThread.main(ActivityThread.java:5254)
       at java.lang.reflect.Method.invoke(Native Method)
       at java.lang.reflect.Method.invoke(Method.java:372)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

UserFunction.class

import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONObject;
import android.content.Context;
import com.app.latihan.Utils.JSONParser;

public class UserFunctions {
private JSONParser jsonParser;
//URL of the PHP API
private static String loginURL = "http://10.0.2.2/aa/";
private static String registerURL = "http://10.0.2.2/aa/";
private static String forpassURL = "http://10.0.2.2/aa/";
private static String chgpassURL = "http://10.0.2.2/aa/";

private static String login_tag = "login";
private static String register_tag = "register";
private static String forpass_tag = "forpass";
private static String chgpass_tag = "chgpass";

// constructor
public UserFunctions(){
jsonParser = new JSONParser();
}
public JSONObject loginUser(String email, String password){
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("tag", login_tag));
params.add(new BasicNameValuePair("email", email));
params.add(new BasicNameValuePair("password", password));
JSONObject json = jsonParser.getJSONFromUrl(loginURL, params);
return json;
}

public JSONObject chgPass(String newpas, String email){
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("tag", chgpass_tag));
params.add(new BasicNameValuePair("newpas", newpas));
params.add(new BasicNameValuePair("email", email));
JSONObject json = jsonParser.getJSONFromUrl(chgpassURL, params);
return json;
}


/**
* Function to reset the password
**/
public JSONObject forPass(String forgotpassword){
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("tag", forpass_tag));
params.add(new BasicNameValuePair("forgotpassword", forgotpassword));
JSONObject json = jsonParser.getJSONFromUrl(forpassURL, params);
return json;
}


public JSONObject registerUser(String fname, String lname, String email, String uname, String password){
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("tag", register_tag));
params.add(new BasicNameValuePair("fname", fname));
params.add(new BasicNameValuePair("lname", lname));
params.add(new BasicNameValuePair("email", email));
params.add(new BasicNameValuePair("uname", uname));
params.add(new BasicNameValuePair("password", password));
JSONObject json = jsonParser.getJSONFromUrl(registerURL,params);
return json;
}

/**
* Function to logout user
* Resets the temporary data stored in SQLite Database
* */
public boolean logoutUser(Context context){
DatabaseHandler db = new DatabaseHandler(context);
db.resetTables();
return true;
}
}

我使用安卓工作室请有人帮我，请

Answer 1

您的错误是由NULLPointerException引起的，这是因为您尝试使用json.getString(KEY_SUCCESS)，但JSON对象是null。NULL是因为doInBackground返回null对象，特别是userFunction.registerUser(fname, lname, email, uname, password)返回null对象。

尝试修复此问题或发布UserFunction类以更好地帮助您。

Answer 2

您的服务器响应不正确。这是您从服务器得到的响应：

(！)已弃用：mysql_connect()：mysql扩展已弃用，将来将被删除：在18调用堆栈上的C:\wamp\www\aa\include\DB_connect.php中使用mysqli或PDO#TimeMemoryFunctionLocation10.4669151232｛main｝()。。\index.php：020.6559171112DB_函数->__构造()。。\index.php：1330.7570174872DB_连接->连接()。。\DB_Functions.php：1340.7661175384http://www.php.net/function.mysql-connect'target='_new'>mysql_connect()。。\DB_Connect.php：18｛"tag"："register"，"success"：1，"error"：0，"user"：｛"fname"："test1"，"lname"：[e-mail]"，"uname"："test4"，"uid"："575a6d8b4cc012.68231874"，"created_at"："2016-06-10 14:34:35"｝｝

I，这几行的意思更少：

(！)已弃用：mysql_connect()：mysql扩展已弃用，将来将被删除：在18调用堆栈上的C:\wamp\www\aa\include\DB_connect.php中使用mysqli或PDO#TimeMemoryFunctionLocation10.4669151232｛main｝()。。\index.php：020.6559171112DB_函数->__构造()。。\index.php：1330.7570174872DB_连接->连接()。。\DB_Functions.php：1340.7661175384http://www.php.net/function.mysql-connect'target='_new'>mysql_connect()。。\DB_Connect.php：18

以上文本无法转换为JSONObject/JsonArray这就是原因，为什么您的代码给出错误

请在服务器端更改代码。这将是来自服务器的正确响应：

{"tag":"register","success":1,"error":0,"user":{"fname":"test1","lname":"test2","email":"[e-mail]","uname":"test4","uid":"575a6d8b4cc012.68231874","created_at":"2016-06-10 14:34:35"}}

我认为您的服务器端代码中存在一些错误。请联系您的API开发人员。。！！

为了避免类似的进一步错误。请按如下方式更改您的代码。

在ProcessRegister异步任务中：

@Override
protected void onPostExecute(JSONObject json) {
try {
if (json!=null && json.getString(KEY_SUCCESS) != null) {
//Your code
}

else{
//your code
}

} catch (JSONException e) {
e.printStackTrace();

}
}}

Answer 3

@cricket_007我的应用程序上的这个UserFunction.java

i
mport java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONObject;
import android.content.Context;
import com.app.latihan.Utils.JSONParser;

public class UserFunctions {
private JSONParser jsonParser;
//URL of the PHP API
private static String loginURL = "http://10.0.2.2/aa/";
private static String registerURL = "http://10.0.2.2/aa/";
private static String forpassURL = "http://10.0.2.2/aa/";
private static String chgpassURL = "http://10.0.2.2/aa/";

private static String login_tag = "login";
private static String register_tag = "register";
private static String forpass_tag = "forpass";
private static String chgpass_tag = "chgpass";

// constructor
public UserFunctions(){
jsonParser = new JSONParser();
}
/**
* Function to Login
**/
public JSONObject loginUser(String email, String password){
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("tag", login_tag));
params.add(new BasicNameValuePair("email", email));
params.add(new BasicNameValuePair("password", password));
JSONObject json = jsonParser.getJSONFromUrl(loginURL, params);
return json;
}
/**
* Function to change password
**/
public JSONObject chgPass(String newpas, String email){
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("tag", chgpass_tag));
params.add(new BasicNameValuePair("newpas", newpas));
params.add(new BasicNameValuePair("email", email));
JSONObject json = jsonParser.getJSONFromUrl(chgpassURL, params);
return json;
}


/**
* Function to reset the password
**/
public JSONObject forPass(String forgotpassword){
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("tag", forpass_tag));
params.add(new BasicNameValuePair("forgotpassword", forgotpassword));
JSONObject json = jsonParser.getJSONFromUrl(forpassURL, params);
return json;
}



/**
* Function to  Register
**/
public JSONObject registerUser(String fname, String lname, String email, String uname, String password){
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("tag", register_tag));
params.add(new BasicNameValuePair("fname", fname));
params.add(new BasicNameValuePair("lname", lname));
params.add(new BasicNameValuePair("email", email));
params.add(new BasicNameValuePair("uname", uname));
params.add(new BasicNameValuePair("password", password));
JSONObject json = jsonParser.getJSONFromUrl(registerURL,params);
return json;
}

/**
* Function to logout user
* Resets the temporary data stored in SQLite Database
* */
public boolean logoutUser(Context context){
DatabaseHandler db = new DatabaseHandler(context);
db.resetTables();
return true;
}
}