2
我想創建一個簡單的android應用程序，它使用php連接mysql。我嘗試登錄this site登錄教程。請幫忙。Android的mysql連接問題
我的代碼是：
- LoginScreen
package com.project.test;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.R.integer;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class TestingInstanceExpenseActivity extends Activity {
/** Called when the activity is first created. */
private Button login;
private Button newUser;
private EditText username;
private EditText 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";
UserFunctions userFunctions = new UserFunctions();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Importing all assets like buttons, text fields
login = (Button)findViewById(R.id.bt_login);
username = (EditText)findViewById(R.id.username);
password = (EditText)findViewById(R.id.password);
newUser = (Button)findViewById(R.id.bt_newuser);
// Login button Click Event
login.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String uname = username.getText().toString();
String pass = password.getText().toString();
Log.d("Button", "Login");
JSONObject jsonObject = userFunctions.loginUser(uname, pass);
Log.i("loginuser","called login user function");
/*try {
JSONArray x = jsonObject.getJSONArray("success");
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}*/
try {
if(!(jsonObject.getString(KEY_SUCCESS).equals(null))) {
String res = jsonObject.getString(KEY_SUCCESS);
if(Integer.parseInt(res) == 1) {
Toast.makeText(getApplicationContext(), "Valid Credential", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getApplicationContext(), "Invalid Credential", Toast.LENGTH_LONG).show();
}
}
} catch (JSONException e){
e.printStackTrace();
}
}
});
newUser.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent intent = new Intent(getApplicationContext(), Createuser.class);
startActivity(intent);
}
});
}
}
- UserFunctions
package com.project.test;
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 android.util.Log;
public class UserFunctions {
private JSONParser jsonParser;
private static String URL = "http://10.0.2.2/instance_expense_calculator/";
private static String login_tag = "login";
private static String register_tag = "register";
// constructor
public UserFunctions(){
jsonParser = new JSONParser();
}
public JSONObject loginUser(String username, String password){
// Building Parameters
Log.i("JSON Parser class", "json class method invoked");
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("tag", login_tag));
params.add(new BasicNameValuePair("username", username));
params.add(new BasicNameValuePair("password", password));
JSONObject json = jsonParser.getJSONFromUrl(URL, params);
// return json
return json;
}
/**
* function make Login Request
* @param name
* @param email
* @param password
* */
public JSONObject registerUser(String firstname, String lastname, String username, String password){
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("tag", register_tag));
params.add(new BasicNameValuePair("firstname", firstname));
params.add(new BasicNameValuePair("lastname", lastname));
params.add(new BasicNameValuePair("username", username));
params.add(new BasicNameValuePair("password", password));
// getting JSON Object
JSONObject json = jsonParser.getJSONFromUrl(URL, params);
// return json
return json;
}
}
- JSONParser
package com.project.test;
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.JSONArray;
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 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 {
JSONArray jsonArray = new JSONArray(json);
for(int i=0;i<jsonArray.length();i++) {
jObj = jsonArray.getJSONObject(i);
Log.i("testing", jObj.getString("tag"));
Log.i("testing", jObj.getString("success"));
Log.i("testing", jObj.getString("error"));
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// return JSON String
return jObj;
}
}
我的PHP文件是：
- 的index.php
<?php
if(isset($_POST['tag'])){
//get tag
$tag = $_POST['tag'];
//include db handler
require_once 'DB_Functions.php';
$db = new DB_Functions();
//response Array
$response = array('tag' => $tag, 'success' => 0, 'error' => 0);
//check for tag type
if($tag == 'login') {
//request type is check login
$username = $_POST['username'];
$password = $_POST['password'];
//check for user
$user = $db->getUserByEmailAndPassword($username, $password);
if($user) {
//user found
//echo json with success = 1
$response['success'] = 1;
echo json_encode($response);
} else {
//user not found
//echo jason with error = 1
$response['error'] = 1;
$response['error_msg'] = "Incorrect email or password!";
echo json_encode($response);
}
} else if ($tag == 'register') {
//request type is register new user
$name = $_POST['first_name'];
$name = $_POST['lasst_name'];
$username = $_POST['username'];
$password = $_POST['password'];
//check if user already exists
if($db-> isUserExisted($username)){
//user exist - error responbse
$response['error'] = 2;
$response['error_msg'] = "User already existed";
echo json_encode($response);
} else {
//store user information
$user = $db->storeUser($first_name, $last_name, $username, $password);
if($user) {
//stored successfully
$response['success'] = 1;
echo json_encode($response);
} else {
//user failed to store
$response['error'] = 1;
$response['error_msg'] = "Error occured while Registring the user";
echo json_encode($response);
}
}
} else {
echo "Invalid Request";
}
} else {
echo "Access Denied";
}
?>
- DB_Functions.php
<?php
class DB_Functions {
private $db;
//put code here
//constructor
function construct() {
require_once 'DB_Connect.php';
//connecting to database
$this ->db = new DB_Connect();
$this ->db->connect();
}
//destructor
/**
*storing new user
*returns user details
*/
public function storeUser($username, $first_name, $last_name, $password) {
mysql_query("Insert into user_registration values ('$username', '$first_name', '$last_name', '$password')");
}
/**
*Get user by email and password
*/
public function getUserInformation($username, $password) {
$result = mysql_query("Select * from user_registration where username = '$username' and password = '$password'") or die(mysql_error());
//check for result
$no_of_rows = mysql_num_rows($result);
if($no_of_rows > 0) {
return true;
} else {
// user not found
return false;
}
}
/**
*check user is existed or not
*/
public function isUserExisted($username) {
$result = mysql_query("Select username from users where username = '$username'");
$no_of_rows = mysql_num_rows($result);
if($no_of_rows >0) {
//user existed
return true;
} else {
//user not existed
return false;
}
}
/**
*Encrypting password
*@param password
* returns salt and encrypted password
*/
}
?>
DB_Connect.php
- 的config.php
Mysql數據庫包含的字段名字，姓氏，用戶名和密碼錶user_registration。
錯誤接收：
03-05 16:39:00.589: D/Button(827): Login
03-05 16:39:00.589: I/JSON Parser class(827): json class method invoked
03-05 16:39:00.908: E/JSON(827): <br />
03-05 16:39:00.908: E/JSON(827): <font size='1'><table class='xdebug-error' dir='ltr' border='1' cellspacing='0' cellpadding='1'>
03-05 16:39:00.908: E/JSON(827): <tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>(!)</span> Fatal error: Call to undefined method DB_Functions::getUserByEmailAndPassword() in C:\wamp\www\instance_expense_calculator\index.php on line <i>16</i></th></tr>
03-05 16:39:00.908: E/JSON(827): <tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
03-05 16:39:00.908: E/JSON(827): <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>
03-05 16:39:00.908: E/JSON(827): <tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0011</td><td bgcolor='#eeeeec' align='right'>377960</td><td bgcolor='#eeeeec'>{main}()</td><td title='C:\wamp\www\instance_expense_calculator\index.php' bgcolor='#eeeeec'>..\index.php<b>:</b>0</td></tr>
03-05 16:39:00.908: E/JSON(827): </table></font>
03-05 16:39:00.908: W/System.err(827): org.json.JSONException: Value <br of type java.lang.String cannot be converted to JSONArray
03-05 16:39:00.908: W/System.err(827): at org.json.JSON.typeMismatch(JSON.java:107)
03-05 16:39:00.919: W/System.err(827): at org.json.JSONArray.<init>(JSONArray.java:91)
03-05 16:39:00.919: W/System.err(827): at org.json.JSONArray.<init>(JSONArray.java:103)
03-05 16:39:00.919: W/System.err(827): at com.project.test.JSONParser.getJSONFromUrl(JSONParser.java:70)
03-05 16:39:00.919: W/System.err(827): at com.project.test.UserFunctions.loginUser(UserFunctions.java:34)
03-05 16:39:00.919: W/System.err(827): at com.project.test.TestingInstanceExpenseActivity$1.onClick(TestingInstanceExpenseActivity.java:53)
03-05 16:39:00.919: W/System.err(827): at android.view.View.performClick(View.java:2408)
03-05 16:39:00.919: W/System.err(827): at android.view.View$PerformClick.run(View.java:8816)
03-05 16:39:00.919: W/System.err(827): at android.os.Handler.handleCallback(Handler.java:587)
03-05 16:39:00.929: W/System.err(827): at android.os.Handler.dispatchMessage(Handler.java:92)
03-05 16:39:00.929: W/System.err(827): at android.os.Looper.loop(Looper.java:123)
03-05 16:39:00.929: W/System.err(827): at android.app.ActivityThread.main(ActivityThread.java:4627)
03-05 16:39:00.929: W/System.err(827): at java.lang.reflect.Method.invokeNative(Native Method)
03-05 16:39:00.929: W/System.err(827): at java.lang.reflect.Method.invoke(Method.java:521)
03-05 16:39:00.929: W/System.err(827): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
03-05 16:39:00.929: W/System.err(827): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
03-05 16:39:00.929: W/System.err(827): at dalvik.system.NativeStart.main(Native Method)
03-05 16:39:00.929: I/loginuser(827): called login user function
03-05 16:39:00.939: D/AndroidRuntime(827): Shutting down VM
03-05 16:39:00.939: W/dalvikvm(827): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
03-05 16:39:00.949: E/AndroidRuntime(827): FATAL EXCEPTION: main
03-05 16:39:00.949: E/AndroidRuntime(827): java.lang.NullPointerException
03-05 16:39:00.949: E/AndroidRuntime(827): at com.project.test.TestingInstanceExpenseActivity$1.onClick(TestingInstanceExpenseActivity.java:62)
03-05 16:39:00.949: E/AndroidRuntime(827): at android.view.View.performClick(View.java:2408)
03-05 16:39:00.949: E/AndroidRuntime(827): at android.view.View$PerformClick.run(View.java:8816)
03-05 16:39:00.949: E/AndroidRuntime(827): at android.os.Handler.handleCallback(Handler.java:587)
03-05 16:39:00.949: E/AndroidRuntime(827): at android.os.Handler.dispatchMessage(Handler.java:92)
03-05 16:39:00.949: E/AndroidRuntime(827): at android.os.Looper.loop(Looper.java:123)
03-05 16:39:00.949: E/AndroidRuntime(827): at android.app.ActivityThread.main(ActivityThread.java:4627)
03-05 16:39:00.949: E/AndroidRuntime(827): at java.lang.reflect.Method.invokeNative(Native Method)
03-05 16:39:00.949: E/AndroidRuntime(827): at java.lang.reflect.Method.invoke(Method.java:521)
03-05 16:39:00.949: E/AndroidRuntime(827): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
03-05 16:39:00.949: E/AndroidRuntime(827): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
03-05 16:39:00.949: E/AndroidRuntime(827): at dalvik.system.NativeStart.main(Native Method)
03-05 16:39:10.488: I/Process(827): Sending signal. PID: 827 SIG: 9
這個問題有太多的代碼，沒有足夠的解釋什麼是錯的。你已經花時間試圖評估這種情況，不要強迫我們花費相同的時間，以便到達現在的位置。您還應該編輯問題，以便代碼被格式化爲塊。 – unholysampler 2012-03-05 12:44:33