我在MySQL上设计了我的数据库并通过php链接它。如何通过使用HTTP GET方法在Android应用程序上获取它？为此，我使用JSON Parsing从MYSQL获取数据，但我无法显示：（（ 现在我想从HTTP GET请求获取数据，那么我该如何使用它呢？我在服务器上上传我的数据库???我该如何上传？它的方法是什么？我会感谢你的帮助
MySQL数据库是：
<?php
// read_My_Task.php
/*
* Following code will get single task details
* A task_detail is identified by task id (cid)
*/
// 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["cid"])) {
$cid = $_GET['cid'];
// get a task from my-task table
$result = mysql_query("SELECT *FROM my_task WHERE cid = $cid");
if (!empty($result)) {
// check for empty result
if (mysql_num_rows($result) > 0) {
$result = mysql_fetch_array($result);
$my_task = array();
$my_task["cid"] = $result["cid"];
$my_task["cus_name"] = $result["cus_name"];
$my_task["contact_number"] = $result["contact_number"];
$my_task["ticket_no"] = $result["ticket_no"];
$my_task["task_detail"] = $result["task_detail"];
// user node
$response["my_task"] = array();
array_push($response["my_task"], $my_task);
// echoing JSON response
echo json_encode($response);
}
else {
// no task found
$response["success"] = 0;
$response["message"] = "No task found";
// echo no users JSON
echo json_encode($response);
}
} else {
// no task found
$response["success"] = 0;
$response["message"] = "No task found";
// echo no users JSON
echo json_encode($response);
}
} else {
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";
// echoing JSON response
echo json_encode($response);
}
?>
LogCat错误是：
12-17 11:00:39.180: W/System.err(10667): org.apache.http.conn.ConnectTimeoutException: Connect to /198.168.0.29:80 timed out
12-17 11:00:39.180: W/System.err(10667): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:121)
12-17 11:00:39.180: W/System.err(10667): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:143)
12-17 11:00:39.180: W/System.err(10667): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
12-17 11:00:39.180: W/System.err(10667): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
12-17 11:00:39.180: W/System.err(10667): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:359)
12-17 11:00:39.180: W/System.err(10667): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
12-17 11:00:39.180: W/System.err(10667): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
12-17 11:00:39.180: W/System.err(10667): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
12-17 11:00:39.180: W/System.err(10667): at com.example.visit.record.JSONParser.makeHttpRequest(JSONParser.java:62)
12-17 11:00:39.180: W/System.err(10667): at com.example.visit.record.My_Task$GetTaskDetails.doInBackground(My_Task.java:170)
12-17 11:00:39.180: W/System.err(10667): at com.example.visit.record.My_Task$GetTaskDetails.doInBackground(My_Task.java:1)
12-17 11:00:39.180: W/System.err(10667): at android.os.AsyncTask$2.call(AsyncTask.java:185)
12-17 11:00:39.180: W/System.err(10667): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
12-17 11:00:39.180: W/System.err(10667): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
12-17 11:00:39.180: W/System.err(10667): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
12-17 11:00:39.180: W/System.err(10667): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
12-17 11:00:39.190: W/System.err(10667): at java.lang.Thread.run(Thread.java:1027)
12-17 11:00:39.190: E/Buffer Error(10667): Error converting result java.lang.NullPointerException
12-17 11:00:39.190: E/JSON Parser(10667): Error parsing data org.json.JSONException: End of input at character 0 of
12-17 11:00:39.190: W/dalvikvm(10667): threadid=9: thread exiting with uncaught exception (group=0x400205a0)
12-17 11:00:39.200: E/AndroidRuntime(10667): FATAL EXCEPTION: AsyncTask #1
12-17 11:00:39.200: E/AndroidRuntime(10667): java.lang.RuntimeException: An error occured while executing doInBackground()
12-17 11:00:39.200: E/AndroidRuntime(10667): at android.os.AsyncTask$3.done(AsyncTask.java:200)
12-17 11:00:39.200: E/AndroidRuntime(10667): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
12-17 11:00:39.200: E/AndroidRuntime(10667): at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
12-17 11:00:39.200: E/AndroidRuntime(10667): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
12-17 11:00:39.200: E/AndroidRuntime(10667): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
12-17 11:00:39.200: E/AndroidRuntime(10667): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
12-17 11:00:39.200: E/AndroidRuntime(10667): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
12-17 11:00:39.200: E/AndroidRuntime(10667): at java.lang.Thread.run(Thread.java:1027)
12-17 11:00:39.200: E/AndroidRuntime(10667): Caused by: java.lang.NullPointerException
12-17 11:00:39.200: E/AndroidRuntime(10667): at com.example.visit.record.My_Task$GetTaskDetails.doInBackground(My_Task.java:174)
12-17 11:00:39.200: E/AndroidRuntime(10667): at com.example.visit.record.My_Task$GetTaskDetails.doInBackground(My_Task.java:1)
12-17 11:00:39.200: E/AndroidRuntime(10667): at android.os.AsyncTask$2.call(AsyncTask.java:185)
12-17 11:00:39.200: E/AndroidRuntime(10667): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
12-17 11:00:39.200: E/AndroidRuntime(10667): ... 4 more
12-17 11:00:39.510: E/WindowManager(10667): Activity com.example.visit.record.My_Task has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4054caf0 that was originally added here
12-17 11:00:39.510: E/WindowManager(10667): android.view.WindowLeaked: Activity com.example.visit.record.My_Task has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4054caf0 that was originally added here
12-17 11:00:39.510: E/WindowManager(10667): at android.view.ViewRoot.<init>(ViewRoot.java:277)
12-17 11:00:39.510: E/WindowManager(10667): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
12-17 11:00:39.510: E/WindowManager(10667): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
12-17 11:00:39.510: E/WindowManager(10667): at android.view.Window$LocalWindowManager.addView(Window.java:433)
12-17 11:00:39.510: E/WindowManager(10667): at android.app.Dialog.show(Dialog.java:288)
12-17 11:00:39.510: E/WindowManager(10667): at com.example.visit.record.My_Task$GetTaskDetails.onPreExecute(My_Task.java:149)
12-17 11:00:39.510: E/WindowManager(10667): at android.os.AsyncTask.execute(AsyncTask.java:391)
12-17 11:00:39.510: E/WindowManager(10667): at com.example.visit.record.My_Task.onCreate(My_Task.java:108)
12-17 11:00:39.510: E/WindowManager(10667): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
12-17 11:00:39.510: E/WindowManager(10667): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1785)
12-17 11:00:39.510: E/WindowManager(10667): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1842)
12-17 11:00:39.510: E/WindowManager(10667): at android.app.ActivityThread.access$1500(ActivityThread.java:132)
12-17 11:00:39.510: E/WindowManager(10667): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1038)
12-17 11:00:39.510: E/WindowManager(10667): at android.os.Handler.dispatchMessage(Handler.java:99)
12-17 11:00:39.510: E/WindowManager(10667): at android.os.Looper.loop(Looper.java:143)
12-17 11:00:39.510: E/WindowManager(10667): at android.app.ActivityThread.main(ActivityThread.java:4268)
12-17 11:00:39.510: E/WindowManager(10667): at java.lang.reflect.Method.invokeNative(Native Method)
12-17 11:00:39.510: E/WindowManager(10667): at java.lang.reflect.Method.invoke(Method.java:507)
12-17 11:00:39.510: E/WindowManager(10667): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-17 11:00:39.510: E/WindowManager(10667): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-17 11:00:39.510: E/WindowManager(10667): at
它给出错误：
Status Code: 404 Not Found
Accept-Ranges: bytes
Content-Language: en
Content-Type: text/html; charset=iso-8859-1
Date: Mon, 17 Dec 2012 06:40:56 GMT
Keep-Alive: timeout=5, max=100
Proxy-Connection: Keep-Alive
Server: Apache/2.2.17 (Win32) mod_ssl/2.2.17 OpenSSL/0.9.8o PHP/5.3.4 mod_perl/2.0.4 Perl/v5.10.1
Transfer-Encoding: chunked
Vary: accept-language,accept-charset
Method: POST
URL: http://192.168.0.29/mobile/read_mytask.php?cid=1
Body:
cid=cid &
cus_name=c
& contact_no=n
& ticket_no=t
& taskdetail=td
答案 0 :(得分：4)
我将向您概述客户端 - 服务器数据检索在Android中的工作原理。您可以从那里根据您的具体要求定制它，因为您的问题表明我有很大的基础知识差距。
您必须创建REST API（通过使用PHP，Ruby，Python等语言编写服务器端代码），Android应用程序可以使用它来从MySQL数据库中获取数据。
还有其他选项可以避免使用REST API。参见：
How to get from a MySql server to an Android app?
请参阅此处获取有关REST的初学者教程：
http://net.tutsplus.com/tutorials/other/a-beginners-introduction-to-http-and-rest/
一旦你的API写好了。您可以使用HTTP GET请求查询它们并解析结果。如果您以JSON格式返回数据，这里有一个关于如何解析它的教程：
http://www.vogella.com/articles/AndroidJSON/article.html
现在，您可以使用本机android方法将解析后的数据存储在本地数据库中。请参阅此处的db教程：
http://www.vogella.com/articles/AndroidSQLite/article.html
一旦这一切结束。您可以在本地数据库上执行CRUD操作来读取/操作数据，并使用基于XML的Android UI将其显示给用户。
答案 1 :(得分：0)
public class JsonHelper
{
static String response = null;
String jsonRes = "";
public JSONObject JObj=null;
public final static int GET = 1;
public final static int POST = 2;
// public final static String fullUrl = "http://10.0.2.2/fluentcmsonline/";
public JsonHelper()
{
}
public JSONObject MakeJsonCall(String Url,int method)
{
return this.MakeJsonCall(Url, method, null);
}
public JSONObject MakeJsonCall(String Url,int method, List<NameValuePair> params)
{
try
{
DefaultHttpClient HttpClient = new DefaultHttpClient();
HttpEntity httpentity = null;
HttpResponse httprespo = null;
if(method==POST)
{
HttpPost httppost = new HttpPost(fullUrl+Url);
//HttpPost httppost = new HttpPost(Url);
if(params != null)
{
httppost.setEntity(new UrlEncodedFormEntity(params));
}
httprespo = HttpClient.execute(httppost);
}
else
{
if(params != null)
{
String paramString = URLEncodedUtils.format(params, HTTP.UTF_8);
Url += "?"+paramString;
}
HttpGet httpget = new HttpGet(fullUrl+Url);
//HttpGet httpget = new HttpGet(Url);
httprespo = HttpClient.execute(httpget);
}
httpentity = httprespo.getEntity();
if(httpentity != null)
{
InputStream is = httpentity.getContent();
BufferedReader buffer = new BufferedReader(new InputStreamReader(is,"UTF-8"),8);
StringBuilder Sb = new StringBuilder();
String Line = null;
while((Line = buffer.readLine())!=null)
{
Sb.append(Line+"\n");
}
is.close();
jsonRes = Sb.toString();
}
}
catch (UnsupportedEncodingException e) {
e.toString();
} catch (ClientProtocolException e) {
e.toString();
} catch (IOException e) {
e.toString();
}
try
{
JObj = new JSONObject(jsonRes);
Log.e("Data", jsonRes);
}
catch(JSONException e)
{
e.printStackTrace();
}
return JObj;
}
}