我正在创建一个简单的Android应用程序，用于添加用户（注册）和检索用户（登录）
第一个动作完美运行，但第二个力关闭并压碎应用程序。
谁能帮我???
日志猫
04-02 08:24:18.532: E/JSON Parser(2380): Error parsing data org.json.JSONException: Value <br of type java.lang.String cannot be converted to JSONObject
04-02 08:24:18.536: W/dalvikvm(2380): threadid=12: thread exiting with uncaught exception (group=0xa4c06648)
04-02 08:24:18.568: E/AndroidRuntime(2380): FATAL EXCEPTION: AsyncTask #2
04-02 08:24:18.568: E/AndroidRuntime(2380): java.lang.RuntimeException: An error occured while executing doInBackground()
04-02 08:24:18.568: E/AndroidRuntime(2380): at android.os.AsyncTask$3.done(AsyncTask.java:299)
04-02 08:24:18.568: E/AndroidRuntime(2380): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
04-02 08:24:18.568: E/AndroidRuntime(2380): at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
04-02 08:24:18.568: E/AndroidRuntime(2380): at java.util.concurrent.FutureTask.run(FutureTask.java:239)
04-02 08:24:18.568: E/AndroidRuntime(2380): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
04-02 08:24:18.568: E/AndroidRuntime(2380): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
04-02 08:24:18.568: E/AndroidRuntime(2380): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
04-02 08:24:18.568: E/AndroidRuntime(2380): at java.lang.Thread.run(Thread.java:841)
04-02 08:24:18.568: E/AndroidRuntime(2380): Caused by: java.lang.NullPointerException
04-02 08:24:18.568: E/AndroidRuntime(2380): at com.example.dvr.MainActivity$login.doInBackground(MainActivity.java:123)
04-02 08:24:18.568: E/AndroidRuntime(2380): at com.example.dvr.MainActivity$login.doInBackground(MainActivity.java:1)
04-02 08:24:18.568: E/AndroidRuntime(2380): at android.os.AsyncTask$2.call(AsyncTask.java:287)
04-02 08:24:18.568: E/AndroidRuntime(2380): at java.util.concurrent.FutureTask.run(FutureTask.java:234)
04-02 08:24:18.568: E/AndroidRuntime(2380): ... 4 more
04-02 08:24:19.868: E/WindowManager(2380): Activity com.example.dvr.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{52e3cf88 V.E..... R......D 0,0-1026,288} that was originally added here
04-02 08:24:19.868: E/WindowManager(2380): android.view.WindowLeaked: Activity com.example.dvr.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{52e3cf88 V.E..... R......D 0,0-1026,288} that was originally added here
04-02 08:24:19.868: E/WindowManager(2380): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:345)
04-02 08:24:19.868: E/WindowManager(2380): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:239)
04-02 08:24:19.868: E/WindowManager(2380): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
04-02 08:24:19.868: E/WindowManager(2380): at android.app.Dialog.show(Dialog.java:281)
04-02 08:24:19.868: E/WindowManager(2380): at com.example.dvr.MainActivity$login.onPreExecute(MainActivity.java:96)
04-02 08:24:19.868: E/WindowManager(2380): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
04-02 08:24:19.868: E/WindowManager(2380): at android.os.AsyncTask.execute(AsyncTask.java:534)
04-02 08:24:19.868: E/WindowManager(2380): at com.example.dvr.MainActivity$2.onClick(MainActivity.java:70)
04-02 08:24:19.868: E/WindowManager(2380): at android.view.View.performClick(View.java:4240)
04-02 08:24:19.868: E/WindowManager(2380): at android.view.View$PerformClick.run(View.java:17721)
04-02 08:24:19.868: E/WindowManager(2380): at android.os.Handler.handleCallback(Handler.java:730)
04-02 08:24:19.868: E/WindowManager(2380): at android.os.Handler.dispatchMessage(Handler.java:92)
04-02 08:24:19.868: E/WindowManager(2380): at android.os.Looper.loop(Looper.java:137)
04-02 08:24:19.868: E/WindowManager(2380): at android.app.ActivityThread.main(ActivityThread.java:5103)
04-02 08:24:19.868: E/WindowManager(2380): at java.lang.reflect.Method.invokeNative(Native Method)
04-02 08:24:19.868: E/WindowManager(2380): at java.lang.reflect.Method.invoke(Method.java:525)
04-02 08:24:19.868: E/WindowManager(2380): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
04-02 08:24:19.868: E/WindowManager(2380): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
04-02 08:24:19.868: E/WindowManager(2380): at dalvik.system.NativeStart.main(Native Method)
- PHP代码：
1）db_config.php
<?php
/*
* All database connection variables
*/
define('DB_USER', "********"); // db user
define('DB_PASSWORD', "*********"); // db password (mention your db password here)
define('DB_DATABASE', "databse"); // database name
define('DB_SERVER', "localhost"); // db server
?>
2）添加用户.php
<?php
/*
* Following code will create a new product row
* All product details are read from HTTP Post Request
*/
// array for JSON response
$response = array();
// check for required fields
if (isset($_POST['user']) && isset($_POST['password']) ) {
$user = $_POST['user'];
$password = $_POST['password'];
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// mysql inserting a new row
$result = mysql_query("INSERT INTO users(user, password) VALUES('$user', '$password')");
// check if row inserted or not
if ($result) {
// successfully inserted into database
$response["success"] = 1;
$response["message"] = "Product successfully created.";
// echoing JSON response
echo json_encode($response);
} else {
// failed to insert row
$response["success"] = 0;
$response["message"] = "Oops! An error occurred.";
// echoing JSON response
echo json_encode($response);
}
} else {
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";
// echoing JSON response
echo json_encode($response);
}
?>
3）登录.php
<?php
//array for JSON response
$response = array();
// check for required fields
if (isset($_POST['user']) && isset($_POST['password']) ) {
$user = $_POST['user'];
$password = $_POST['password'];
// include db connect class
require_once '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// mysql inserting a new row
$sql = mysql_query("Select user, password from users where user='$user'")or die(mysql_error());
$count_query = mysql_num_rows($query);
if($sql){
$response["success"] = 0;
$response["message"] = "Wrong User Or Pass";
// echoing JSON response
echo json_encode($response);
}
else{
$response["success"] = 1;
$response["message"] = "correct Informations";
// echoing JSON response
echo json_encode($response);
}
}
else {
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";
// echoing JSON response
echo json_encode($response);
}
?>
错误在登录操作中如何修复此错误，我需要它才能工作。
- 安卓代码：
1） JSONParser.java
package com.example.dvr;
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.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
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() {
}
// function get json from url
// by making HTTP POST or GET mehtod
public JSONObject makeHttpRequest(String url, String method,
List<NameValuePair> params) {
// Making HTTP request
try {
// check for request method
if(method == "POST"){
// request method is POST
// 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();
}else if(method == "GET"){
// request method is GET
DefaultHttpClient httpClient = new DefaultHttpClient();
String paramString = URLEncodedUtils.format(params, "utf-8");
url += "?" + paramString;
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
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();
} 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;
}
}
2）主要活动.java
package com.example.dvr;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity {
// Progress Dialog
private ProgressDialog pDialog;
JSONParser jsonParser = new JSONParser();
EditText username_edt;
EditText pass_edt;
// url to creaate new product
private static String url_create_user = "http://10.0.3.2/android_connect/adduser.php";
private static String url_login_user = "http://10.0.3.2/android_connect/login.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Edit Text
username_edt = (EditText) findViewById(R.id.editText1);
pass_edt = (EditText) findViewById(R.id.editText2);
// inputDesc = (EditText) findViewById(R.id.inputDesc);
// Create button
Button btnCreateProduct = (Button) findViewById(R.id.btnlogin);
// button click event
btnCreateProduct.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// creating new product in background thread
new CreateNewProduct().execute();
}
});
// Login button
Button loginBtn = (Button) findViewById(R.id.btn_login);
// button click event
loginBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// creating new product in background thread
new login().execute();
Toast.makeText(getBaseContext(),
username_edt.toString() + pass_edt.toString(),
Toast.LENGTH_SHORT).show();
}
});
}
/**
* Selecting Users
* */
class login extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Creating Product..");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Creating product
* */
protected String doInBackground(String... args) {
String user = username_edt.getText().toString();
String password = pass_edt.getText().toString();
// String description = inputDesc.getText().toString();
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("user", user));
params.add(new BasicNameValuePair("password", password));
// params.add(new BasicNameValuePair("description", description));
// getting JSON Object
// Note that create product url accepts POST method
JSONObject json = jsonParser.makeHttpRequest(url_login_user,
"POST", params);
// check log cat from response
// Log.d("Create Response", json.toString());
// check for success tag
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
finish();
} else {
// failed
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once done
pDialog.dismiss();
}
}
/**
* Background Async Task to Create new product
* */
class CreateNewProduct extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Creating Product..");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Creating product
* */
protected String doInBackground(String... args) {
String user = username_edt.getText().toString();
String password = pass_edt.getText().toString();
// String description = inputDesc.getText().toString();
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("user", user));
params.add(new BasicNameValuePair("password", password));
// params.add(new BasicNameValuePair("description", description));
// getting JSON Object
// Note that create product url accepts POST method
JSONObject json = jsonParser.makeHttpRequest(url_create_user,
"POST", params);
// check log cat from response
Log.d("Create Response", json.toString());
// check for success tag
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
finish();
} else {
// failed
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once done
pDialog.dismiss();
}
}
}
使用地址 10.0.2.2 代替 10.0.3.2
private static String url_create_user = "http://10.0.2.2/android_connect/adduser.php";
private static String url_login_user = "http://10.0.2.2/android_connect/login.php";
我能够通过在创建新的 JSONObject 之前添加一个简单的 Log.i（） 来修复错误，它向我显示我在第 20 行的登录.php文件中有一个错误
我通过参考这个解决方案解决了这个问题 org.json.JSONException：类型为 java.lang.String 的值