I am using the code I found in the following tutorial to connect an Android application with a MySQL database with the help of a php script I found here
http://www.androidhive.info/2012/05/how-to-connect-android-with-php-mysql/
我下载了代码并尝试在模拟器中执行项目。我的应用程序是在模拟器中创建的，我可以执行mainscreenactivity但无法移动到下一个活动来执行CRUD操作。在模拟器中，加载后说，不幸的是，
MainScreen has stopped作为弹出消息。我的申请名称是MainScreen。我检查了我的Eclipse LogCat，它显示以下错误。如果有人能帮助我解决这个问题，我将不胜感激。
Logcat：
12-12 07:41:01.496: E/ActivityThread(685): Service com.android.exchange.ExchangeService has leaked ServiceConnection com.android.emailcommon.service.ServiceProxy$ProxyConnection@40d5daa8 that was originally bound here
12-12 07：41：01.496：E / ActivityThread（685）：android.app.ServiceConnectionLeaked：服务com.android.exchange.ExchangeService泄漏了ServiceConnection com.android.emailcommon.service.ServiceProxy$ProxyConnection@40d5daa8最初被绑在这里 12-12 07：41：01.496：E / ActivityThread（685）：在android.app.LoadedApk $ ServiceDispatcher。（LoadedApk.java:969） 12-12 07：41：01.496：E / ActivityThread（685）：在android.app.LoadedApk.getServiceDispatcher（LoadedApk.java:863） 12-12 07：41：01.496：E / ActivityThread（685）：在android.app.ContextImpl.bindService（ContextImpl.java:1418） 12-12 07：41：01.496：E / ActivityThread（685）：在android.app.ContextImpl.bindService（ContextImpl.java:1407） 12-12 07：41：01.496：E / ActivityThread（685）：在android.content.ContextWrapper.bindService（ContextWrapper.java:473） 12-12 07：41：01.496：E / ActivityThread（685）：at com.android.emailcommon.service.ServiceProxy.setTask（ServiceProxy.java:157） 12-12 07：41：01.496：E / ActivityThread（685）：at com.android.emailcommon.service.ServiceProxy.setTask（ServiceProxy.java:145） 12-12 07：41：01.496：E / ActivityThread（685）：at com.android.emailcommon.service.ServiceProxy.test（ServiceProxy.java:191） 12-12 07：41：01.496：E / ActivityThread（685）：at com.android.exchange.ExchangeService $ 7.run（ExchangeService.java:1850） 12-12 07：41：01.496：E / ActivityThread（685）：at com.android.emailcommon.utility.Utility $ 2.doInBackground（Utility.java:551） 12-12 07：41：01.496：E / ActivityThread（685）：at com.android.emailcommon.utility.Utility $ 2.doInBackground（Utility.java:549） 12-12 07：41：01.496：E / ActivityThread（685）：在android.os.AsyncTask $ 2.call（AsyncTask.java:287） 12-12 07：41：01.496：E / ActivityThread（685）：at java.util.concurrent.FutureTask.run（FutureTask.java:234） 12-12 07：41：01.496：E / ActivityThread（685）：at java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1080） 12-12 07：41：01.496：E / ActivityThread（685）：at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:573） 12-12 07：41：01.496：E / ActivityThread（685）：at java.lang.Thread.run（Thread.java:856） 12-12 07：41：01.526：E / StrictMode（685）：null 12-12 07：41：01.526：E / StrictMode（685）：android.app.ServiceConnectionLeaked：服务com.android.exchange.ExchangeService泄漏了最初绑定的ServiceConnection com.android.emailcommon.service.ServiceProxy$ProxyConnection@40d5daa8这里 12-12 07：41：01.526：E / StrictMode（685）：在android.app.LoadedApk $ ServiceDispatcher。（LoadedApk.java:969） 12-12 07：41：01.526：E / StrictMode（685）：在android.app.LoadedApk.getServiceDispatcher（LoadedApk.java:863） 12-12 07：41：01.526：E / StrictMode（685）：在android.app.ContextImpl.bindService（ContextImpl.java:1418） 12-12 07：41：01.526：E / StrictMode（685）：在android.app.ContextImpl.bindService（ContextImpl.java:1407） 12-12 07：41：01.526：E / StrictMode（685）：在android.content.ContextWrapper.bindService（ContextWrapper.java:473） 12-12 07：41：01.526：E / StrictMode（685）：at com.android.emailcommon.service.ServiceProxy.setTask（ServiceProxy.java:157） 12-12 07：41：01.526：E / StrictMode（685）：at com.android.emailcommon.service.ServiceProxy.setTask（ServiceProxy.java:145） 12-12 07：41：01.526：E / StrictMode（685）：at com.android.emailcommon.service.ServiceProxy.test（ServiceProxy.java:191） 12-12 07：41：01.526：E / StrictMode（685）：at com.android.exchange.ExchangeService $ 7.run（ExchangeService.java:1850） 12-12 07：41：01.526：E / StrictMode（685）：at com.android.emailcommon.utility.Utility $ 2.doInBackground（Utility.java:551） 12-12 07：41：01.526：E / StrictMode（685）：at com.android.emailcommon.utility.Utility $ 2.doInBackground（Utility.java:549） 12-12 07：41：01.526：E / StrictMode（685）：在android.os.AsyncTask $ 2.call（AsyncTask.java:287） 12-12 07：41：01.526：E / StrictMode（685）：at java.util.concurrent.FutureTask.run（FutureTask.java:234） 12-12 07：41：01.526：E / StrictMode（685）：at java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1080） 12-12 07：41：01.526：E / StrictMode（685）：at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:573） 12-12 07：41：01.526：E / StrictMode（685）：at java.lang.Thread.run（Thread.java:856）
Mysql数据库：
CREATE DATABASE androidhive;
CREATE TABLE products(
pid int(11) primary key auto_increment,
name varchar(100) not null,
price decimal(10,2) not null,
description text,
created_at timestamp default now(),
updated_at timestamp
);
**php script:**
**db_config.php**
db_config.php
<?php
/*
* All database connection variables
*/
define('DB_USER', "root"); // db user
define('DB_PASSWORD', ""); // db password (mention your db password here)
define('DB_DATABASE', "androidhive"); // database name
define('DB_SERVER', "localhost"); // db server
?>
**db_connect.php**
db_connect.php
<?php
/**
* A class file to connect to database
*/
class DB_CONNECT {
// constructor
function __construct() {
// connecting to database
$this->connect();
}
// destructor
function __destruct() {
// closing db connection
$this->close();
}
/**
* Function to connect with database
*/
function connect() {
// import database connection variables
require_once __DIR__ . '/db_config.php';
// Connecting to mysql database
$con = mysql_connect(DB_SERVER, DB_USER, DB_PASSWORD) or die(mysql_error());
// Selecing database
$db = mysql_select_db(DB_DATABASE) or die(mysql_error()) or die(mysql_error());
// returing connection cursor
return $con;
}
/**
* Function to close db connection
*/
function close() {
// closing db connection
mysql_close();
}
}
?>
**Mysql CRUD operation:**
**Creating a row:**
**create_product.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['name']) && isset($_POST['price']) && isset($_POST['description'])) {
$name = $_POST['name'];
$price = $_POST['price'];
$description = $_POST['description'];
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// mysql inserting a new row
$result = mysql_query("INSERT INTO products(name, price, description) VALUES('$name', '$price', '$description')");
// 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);
}
?>
**Reading a row:**
**get_product_details.php**
<?php
/*
* Following code will get single product details
* A product is identified by product id (pid)
*/
// array for JSON response
$response = array();
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// check for post data
if (isset($_GET["pid"])) {
$pid = $_GET['pid'];
// get a product from products table
$result = mysql_query("SELECT *FROM products WHERE pid = $pid");
if (!empty($result)) {
// check for empty result
if (mysql_num_rows($result) > 0) {
$result = mysql_fetch_array($result);
$product = array();
$product["pid"] = $result["pid"];
$product["name"] = $result["name"];
$product["price"] = $result["price"];
$product["description"] = $result["description"];
$product["created_at"] = $result["created_at"];
$product["updated_at"] = $result["updated_at"];
// success
$response["success"] = 1;
// user node
$response["product"] = array();
array_push($response["product"], $product);
// echoing JSON response
echo json_encode($response);
} else {
// no product found
$response["success"] = 0;
$response["message"] = "No product found";
// echo no users JSON
echo json_encode($response);
}
} else {
// no product found
$response["success"] = 0;
$response["message"] = "No product found";
// echo no users JSON
echo json_encode($response);
}
} else {
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";
// echoing JSON response
echo json_encode($response);
}
?>
**Reading all rows:**
**get_all_products.php**
<?php
/*
* Following code will list all the products
*/
// array for JSON response
$response = array();
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// get all products from products table
$result = mysql_query("SELECT *FROM products") or die(mysql_error());
// check for empty result
if (mysql_num_rows($result) > 0) {
// looping through all results
// products node
$response["products"] = array();
while ($row = mysql_fetch_array($result)) {
// temp user array
$product = array();
$product["pid"] = $row["pid"];
$product["name"] = $row["name"];
$product["price"] = $row["price"];
$product["created_at"] = $row["created_at"];
$product["updated_at"] = $row["updated_at"];
// push single product into final response array
array_push($response["products"], $product);
}
// success
$response["success"] = 1;
// echoing JSON response
echo json_encode($response);
} else {
// no products found
$response["success"] = 0;
$response["message"] = "No products found";
// echo no users JSON
echo json_encode($response);
}
?>
**Updating a row:**
**update_product.php**
<?php
/*
* Following code will update a product information
* A product is identified by product id (pid)
*/
// array for JSON response
$response = array();
// check for required fields
if (isset($_POST['pid']) && isset($_POST['name']) && isset($_POST['price']) && isset($_POST['description'])) {
$pid = $_POST['pid'];
$name = $_POST['name'];
$price = $_POST['price'];
$description = $_POST['description'];
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// mysql update row with matched pid
$result = mysql_query("UPDATE products SET name = '$name', price = '$price', description = '$description' WHERE pid = $pid");
// check if row inserted or not
if ($result) {
// successfully updated
$response["success"] = 1;
$response["message"] = "Product successfully updated.";
// echoing JSON response
echo json_encode($response);
} else {
}
} else {
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";
// echoing JSON response
echo json_encode($response);
}
?>
**Deleting a row:**
**delete_product.php**
<?php
/*
* Following code will delete a product from table
* A product is identified by product id (pid)
*/
// array for JSON response
$response = array();
// check for required fields
if (isset($_POST['pid'])) {
$pid = $_POST['pid'];
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// mysql update row with matched pid
$result = mysql_query("DELETE FROM products WHERE pid = $pid");
// check if row deleted or not
if (mysql_affected_rows() > 0) {
// successfully updated
$response["success"] = 1;
$response["message"] = "Product successfully deleted";
// echoing JSON response
echo json_encode($response);
} else {
// no product found
$response["success"] = 0;
$response["message"] = "No product found";
// echo no users JSON
echo json_encode($response);
}
} else {
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";
// echoing JSON response
echo json_encode($response);
}
?>
我的android代码在我的第二篇文章中。请检查代码并建议我修复错误。
答案 0 :(得分：0)
尝试在oncreate（）方法中添加以下两行代码。
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);