单击登录按钮后，Android登录页面崩溃

时间：2015-02-01 04:57:08

标签： php android json android-asynctask 

<?php

class DB_Functions {

    include 'config.php'
    private $db;
    $con = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD,DB_DATABASE);

    function __construct() {
        require_once 'DB_Connect.php';
        // connecting to database
        $this->db = new DB_Connect();
        $this->db->connect();
    }

    // destructor
    function __destruct() {

    }

    /**
     * Storing new user
     * returns user details
     */
    public function storeUser($name, $email, $password) {
        $uuid = uniqid('', true);
        $hash = $this->hashSSHA($password);
        $encrypted_password = $hash["encrypted"]; // encrypted password
        $salt = $hash["salt"]; // salt
        $result = mysqli_query($con,"INSERT INTO users(unique_id, name, email, encrypted_password, salt, created_at) VALUES('$uuid', '$name', '$email', '$encrypted_password', '$salt', NOW())");
        // check for successful store
        if ($result) {
            // get user details 
            $uid = mysqli_insert_id(); // last inserted id
            $result = mysqli_query($con,"SELECT * FROM users WHERE uid = $uid");
            // return user details
            return mysqli_fetch_array($result);
        } else {
            return false;
        }
    }

    /**
     * Get user by email and password
     */
    public function getUserByEmailAndPassword($email, $password) {
        $result = mysqli_query($con,"SELECT * FROM users WHERE email = '$email'") or die(mysqli_error());
        // check for result 
        $no_of_rows = mysqli_num_rows($result);
        if ($no_of_rows > 0) {
            $result = mysqli_fetch_array($result);
            $salt = $result['salt'];
            $encrypted_password = $result['encrypted_password'];
            $hash = $this->checkhashSSHA($salt, $password);
            // check for password equality
            if ($encrypted_password == $hash) {
                // user authentication details are correct
                return $result;
            }
        } else {
            // user not found
            return false;
        }
    }

    /**
     * Check if user exist or not
     */
    public function isUserExist($email) {
        $result = mysqli_query($con,"SELECT email from users WHERE email = '$email'");
        $no_of_rows = mysqli_num_rows($result);
        if ($no_of_rows > 0) {
            // user exist 
            return true;
        } else {
            // user does not exist
            return false;
        }
    }

    /**
     * Encrypting password
     * @param password
     * returns salt and encrypted password
     */
    public function hashSSHA($password) {

        $salt = sha1(rand());
        $salt = substr($salt, 0, 10);
        $encrypted = base64_encode(sha1($password . $salt, true) . $salt);
        $hash = array("salt" => $salt, "encrypted" => $encrypted);
        return $hash;
    }

    /**
     * Decrypting password
     * @param salt, password
     * returns hash string
     */
    public function checkhashSSHA($salt, $password) {

        $hash = base64_encode(sha1($password . $salt, true) . $salt);

        return $hash;
    }

}

?>

MainActivity代码：

public class MainActivity extends Activity {

    ProgressDialog pDialog;
    Button btnLogin;
    Button btnLinkToRegister;
    public EditText inputEmail;
    public EditText inputPassword;
    TextView loginErrorMsg;
    String email;
    String password;

    // JSON Response node names
    private static String KEY_SUCCESS = "success";
    private static String KEY_ERROR = "error";
    private static String KEY_ERROR_MSG = "error_msg";
    private static String KEY_UID = "uid";
    private static String KEY_NAME = "name";
    private static String KEY_EMAIL = "email";
    private static String KEY_CREATED_AT = "created_at";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Importing all assets like buttons, text fields
        inputEmail = (EditText) findViewById(R.id.loginEmail);
        inputPassword = (EditText) findViewById(R.id.loginPassword);
        btnLogin = (Button) findViewById(R.id.btnLogin);
        btnLinkToRegister = (Button) findViewById(R.id.btnLinkToRegisterScreen);
        loginErrorMsg = (TextView) findViewById(R.id.login_error);

        // Login button Click Event
        btnLogin.setOnClickListener(new View.OnClickListener() {


            public void onClick(View view) {
                email = inputEmail.getText().toString();
                password = inputPassword.getText().toString();
                new GoOnline().execute();
            }
        });

        // Link to Register Screen
        btnLinkToRegister.setOnClickListener(new View.OnClickListener() {

            public void onClick(View view) {
                Intent i = new Intent(getApplicationContext(),
                        RegisterActivity.class);
                startActivity(i);
                finish();
            }
        });
    }

    class GoOnline extends AsyncTask<String, String, String> {

        protected void onPreExecute(){
            super.onPreExecute();
            pDialog = new ProgressDialog(MainActivity.this);
            pDialog.setMessage("Loading route. Please wait...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(false);
            pDialog.show();
        }

        @Override
        protected String doInBackground(String... params) {
            UserFunctions userFunction = new UserFunctions();
            JSONObject json = userFunction.loginUser(email, password);

            // check for login response
            try {
                if (json.getString(KEY_SUCCESS) != null) {
                    loginErrorMsg.setText("");
                    String res = json.getString(KEY_SUCCESS); 
                    if(Integer.parseInt(res) == 1){
                        // user successfully logged in
                        // Store user details in SQLite Database
                        DatabaseHandler db = new DatabaseHandler(getApplicationContext());
                        JSONObject json_user = json.getJSONObject("user");

                        // Clear all previous data in database
                        userFunction.logoutUser(getApplicationContext());
                        db.addUser(json_user.getString(KEY_NAME), json_user.getString(KEY_EMAIL), json.getString(KEY_UID), json_user.getString(KEY_CREATED_AT));                        

                        // Launch Dashboard Screen
                        Intent dashboard = new Intent(getApplicationContext(), DashboardActivity.class);

                        // Close all views before launching Dashboard
                        dashboard.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                        startActivity(dashboard);

                        // Close Login Screen
                        finish();
                    }else{
                        // Error in login
                        loginErrorMsg.setText("Incorrect username/password");
                    }
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }

            return null;
        }

        @Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);
            pDialog.dismiss();
        }


    }
}

UserFunctions代码：

public class UserFunctions {

    private JSONParser jsonParser;

    // Testing in localhost using wamp or xampp 
    // use http://10.0.2.2/ to connect to your localhost ie http://localhost/
    private static String loginURL = "http://192.168.1.33/polizerlogin/";
    private static String registerURL = "http://192.168.1.33/polizerlogin/";

    private static String login_tag = "login";
    private static String register_tag = "register";

    // constructor
    public UserFunctions(){
        jsonParser = new JSONParser();
    }

    /**
     * function make Login Request
     * @param email
     * @param password
     * */
    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
        // Log.e("JSON", json.toString());
        return json;
    }

    /**
     * function make Login Request
     * @param name
     * @param email
     * @param password
     * */
    public JSONObject registerUser(String name, String email, String password){
        // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("tag", register_tag));
        params.add(new BasicNameValuePair("name", name));
        params.add(new BasicNameValuePair("email", email));
        params.add(new BasicNameValuePair("password", password));

        // getting JSON Object
        JSONObject json = jsonParser.getJSONFromUrl(registerURL, params);
        // return json
        return json;
    }

    /**
     * Function get Login status
     * */
    public boolean isUserLoggedIn(Context context){
        DatabaseHandler db = new DatabaseHandler(context);
        int count = db.getRowCount();
        if(count > 0){
            // user logged in
            return true;
        }
        return false;
    }

    /**
     * Function to logout user
     * Reset Database
     * */
    public boolean logoutUser(Context context){
        DatabaseHandler db = new DatabaseHandler(context);
        db.resetTables();
        return true;
    }

}

logcat的：

02-01 10:00:45.835: E/JSON(28424): <br />
02-01 10:00:45.835: E/JSON(28424): <font size='1'><table class='xdebug-error xe-parse-error' dir='ltr' border='1' cellspacing='0' cellpadding='1'>
02-01 10:00:45.835: E/JSON(28424): <tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> Parse error: syntax error, unexpected 'include' (T_INCLUDE), expecting function (T_FUNCTION) in C:\wamp\www\polizerlogin\DB_Functions.php on line <i>5</i></th></tr>
02-01 10:00:45.835: E/JSON(28424): <tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
02-01 10:00:45.835: E/JSON(28424): <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>
02-01 10:00:45.835: E/JSON(28424): <tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0160</td><td bgcolor='#eeeeec' align='right'>141040</td><td bgcolor='#eeeeec'>{main}(  )</td><td title='C:\wamp\www\polizerlogin\index.php' bgcolor='#eeeeec'>..\index.php<b>:</b>0</td></tr>
02-01 10:00:45.835: E/JSON(28424): </table></font>
02-01 10:00:45.839: E/JSON Parser(28424): Error parsing data org.json.JSONException: Value <br of type java.lang.String cannot be converted to JSONObject
02-01 10:00:45.847: E/AndroidRuntime(28424): FATAL EXCEPTION: AsyncTask #4
02-01 10:00:45.847: E/AndroidRuntime(28424): Process: com.mumbaipolice.www, PID: 28424
02-01 10:00:45.847: E/AndroidRuntime(28424): java.lang.RuntimeException: An error occured while executing doInBackground()
02-01 10:00:45.847: E/AndroidRuntime(28424):    at android.os.AsyncTask$3.done(AsyncTask.java:300)
02-01 10:00:45.847: E/AndroidRuntime(28424):    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
02-01 10:00:45.847: E/AndroidRuntime(28424):    at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
02-01 10:00:45.847: E/AndroidRuntime(28424):    at java.util.concurrent.FutureTask.run(FutureTask.java:242)
02-01 10:00:45.847: E/AndroidRuntime(28424):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
02-01 10:00:45.847: E/AndroidRuntime(28424):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
02-01 10:00:45.847: E/AndroidRuntime(28424):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
02-01 10:00:45.847: E/AndroidRuntime(28424):    at java.lang.Thread.run(Thread.java:818)
02-01 10:00:45.847: E/AndroidRuntime(28424): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String org.json.JSONObject.getString(java.lang.String)' on a null object reference
02-01 10:00:45.847: E/AndroidRuntime(28424):    at com.mumbaipolice.www.MainActivity$GoOnline.doInBackground(MainActivity.java:92)
02-01 10:00:45.847: E/AndroidRuntime(28424):    at com.mumbaipolice.www.MainActivity$GoOnline.doInBackground(MainActivity.java:1)
02-01 10:00:45.847: E/AndroidRuntime(28424):    at android.os.AsyncTask$2.call(AsyncTask.java:288)
02-01 10:00:45.847: E/AndroidRuntime(28424):    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
02-01 10:00:45.847: E/AndroidRuntime(28424):    ... 4 more
02-01 10:00:46.478: E/WindowManager(28424): android.view.WindowLeaked: Activity com.mumbaipolice.www.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{26ba7806 V.E..... R......D 0,0-684,232} that was originally added here
02-01 10:00:46.478: E/WindowManager(28424):     at android.view.ViewRootImpl.<init>(ViewRootImpl.java:375)
02-01 10:00:46.478: E/WindowManager(28424):     at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:261)
02-01 10:00:46.478: E/WindowManager(28424):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
02-01 10:00:46.478: E/WindowManager(28424):     at android.app.Dialog.show(Dialog.java:298)
02-01 10:00:46.478: E/WindowManager(28424):     at com.mumbaipolice.www.MainActivity$GoOnline.onPreExecute(MainActivity.java:82)
02-01 10:00:46.478: E/WindowManager(28424):     at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587)
02-01 10:00:46.478: E/WindowManager(28424):     at android.os.AsyncTask.execute(AsyncTask.java:535)
02-01 10:00:46.478: E/WindowManager(28424):     at com.mumbaipolice.www.MainActivity$1.onClick(MainActivity.java:58)
02-01 10:00:46.478: E/WindowManager(28424):     at android.view.View.performClick(View.java:4761)
02-01 10:00:46.478: E/WindowManager(28424):     at android.view.View$PerformClick.run(View.java:19767)
02-01 10:00:46.478: E/WindowManager(28424):     at android.os.Handler.handleCallback(Handler.java:739)
02-01 10:00:46.478: E/WindowManager(28424):     at android.os.Handler.dispatchMessage(Handler.java:95)
02-01 10:00:46.478: E/WindowManager(28424):     at android.os.Looper.loop(Looper.java:135)
02-01 10:00:46.478: E/WindowManager(28424):     at android.app.ActivityThread.main(ActivityThread.java:5312)
02-01 10:00:46.478: E/WindowManager(28424):     at java.lang.reflect.Method.invoke(Native Method)
02-01 10:00:46.478: E/WindowManager(28424):     at java.lang.reflect.Method.invoke(Method.java:372)
02-01 10:00:46.478: E/WindowManager(28424):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
02-01 10:00:46.478: E/WindowManager(28424):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
02-01 10:01:34.850: I/Process(28424): Sending signal. PID: 28424 SIG: 9

每当我尝试登录或注册应用程序时，我的应用程序都会崩溃。在win32位Eclipse ADT上运行Android 5.0.1。有人可以指出我哪里出错了吗？

1 个答案:

答案 0 :(得分：2)

我从你的Logcat中假设以下是PHP代码从你的服务器返回的内容...... 

02-01 10:00:45.835: E/JSON(28424): <br />
02-01 10:00:45.835: E/JSON(28424): <font size='1'><table class='xdebug-error xe-parse-error' dir='ltr' border='1' cellspacing='0' cellpadding='1'>
02-01 10:00:45.835: E/JSON(28424): <tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> Parse error: syntax error, unexpected 'include' (T_INCLUDE), expecting function (T_FUNCTION) in C:\wamp\www\polizerlogin\DB_Functions.php on line <i>5</i></th></tr>
02-01 10:00:45.835: E/JSON(28424): <tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
02-01 10:00:45.835: E/JSON(28424): <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>
02-01 10:00:45.835: E/JSON(28424): <tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0160</td><td bgcolor='#eeeeec' align='right'>141040</td><td bgcolor='#eeeeec'>{main}(  )</td><td title='C:\wamp\www\polizerlogin\index.php' bgcolor='#eeeeec'>..\index.php<b>:</b>0</td></tr>
02-01 10:00:45.835: E/JSON(28424): </table></font>

请注意以上第3行的以下内容...... 

Parse error: syntax error, unexpected 'include' (T_INCLUDE), expecting function (T_FUNCTION) in C:\wamp\www\polizerlogin\DB_Functions.php on line <i>5</i>

我不是一个PHP程序员，但这表明我的PHP第5行存在问题。这是有道理的，因为它有一个include指令... 

include 'config.php'

正如我所说，我不会对PHP做很多事情，但是如果你能找到错误的原因并修复它（加上可能会在PHP代码中加入一些错误处理），那么你应该得到有效的结果。< / p>

我可以看到你正在测试...... 

if (json.getString(KEY_SUCCESS) != null)

...和... 

String res = json.getString(KEY_SUCCESS); 
if(Integer.parseInt(res) == 1){

在这种情况下，PHP端的正确错误处理应返回有效的JSON，但设置KEY_SUCCESS表示错误。它是生成HTML响应的服务器，如果你修复它，那么事情应该没问题。

但是，您的代码确实存在另一个严重缺陷。在您doInBackground(...) AsyncTask的{​​{1}}中，您尝试修改TextView，如下所示...... 

loginErrorMsg.setText("");

...您无法触及doInBackground(...)主题中的任何UI元素。最好的办法就是使用doInBackground(...)来抓住＆＃39;网络响应，然后将其返回onPostExecute(...)，以便它可以处理它。

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