Handle Resposta do servidor no Android
No meu aplicativo, estou buscando dados usando serviços da web. Mas, quando o servidor está inoperante ou não está no estado ativo, ele fornece o código de resposta 500 e meu aplicativo é fechad
Guie-me como lidar com essa condição no meu aplicativo. A saída do logcat é mostrada abaixo:
12-05 12:17:22.337: V/response code(950): 500
12-05 12:17:22.347: W/System.err(950): org.json.JSONException: A JSONArray text must start with '[' at character 1 of <html>
12-05 12:17:22.347: W/System.err(950): <head>
12-05 12:17:22.347: W/System.err(950): <title>Configuration Error</title>
12-05 12:17:22.347: W/System.err(950): <style>
12-05 12:17:22.347: W/System.err(950): body {font-family:"Verdana";font-weight:normal;font-size: .7em;color:black;}
12-05 12:17:22.347: W/System.err(950): p {font-family:"Verdana";font-weight:normal;color:black;margin-top: -5px}
12-05 12:17:22.347: W/System.err(950): b {font-family:"Verdana";font-weight:bold;color:black;margin-top: -5px}
12-05 12:17:22.347: W/System.err(950): H1 { font-family:"Verdana";font-weight:normal;font-size:18pt;color:red }
12-05 12:17:22.347: W/System.err(950): H2 { font-family:"Verdana";font-weight:normal;font-size:14pt;color:maroon }
12-05 12:17:22.356: W/System.err(950): pre {font-family:"Lucida Console";font-size: .9em}
12-05 12:17:22.356: W/System.err(950): .marker {font-weight: bold; color: black;text-decoration: none;}
12-05 12:17:22.356: W/System.err(950): .version {color: gray;}
12-05 12:17:22.356: W/System.err(950): .error {margin-bottom: 10px;}
12-05 12:17:22.356: W/System.err(950): .expandable { text-decoration:underline; font-weight:bold; color:navy; cursor:hand; }
12-05 12:17:22.356: W/System.err(950): </style>
12-05 12:17:22.356: W/System.err(950): </head>
12-05 12:17:22.356: W/System.err(950):
12-05 12:17:22.356: W/System.err(950): <body bgcolor="white">
12-05 12:17:22.366: W/System.err(950):
12-05 12:17:22.366: W/System.err(950): <span><H1>Server Error in '/' Application.<hr width=100% size=1 color=silver></H1>
12-05 12:17:22.366: W/System.err(950):
12-05 12:17:22.366: W/System.err(950): <h2> <i>Configuration Error</i> </h2></span>
12-05 12:17:22.366: W/System.err(950):
12-05 12:17:22.366: W/System.err(950): <font face="Arial, Helvetica, Geneva, SunSans-Regular, sans-serif ">
12-05 12:17:22.366: W/System.err(950):
12-05 12:17:22.366: W/System.err(950): <b> Description: </b>An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.
12-05 12:17:22.377: W/System.err(950): <br><br>
12-05 12:17:22.377: W/System.err(950):
12-05 12:17:22.377: W/System.err(950): <b> Parser Error Message: </b>Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive.<br><br>
12-05 12:17:22.377: W/System.err(950):
12-05 12:17:22.377: W/System.err(950): <b>Source Error:</b> <br><br>
12-05 12:17:22.377: W/System.err(950):
12-05 12:17:22.377: W/System.err(950): <table width=100% bgcolor="#ffffcc">
12-05 12:17:22.377: W/System.err(950): <tr>
12-05 12:17:22.377: W/System.err(950): <td>
12-05 12:17:22.377: W/System.err(950): <code><pre>
12-05 12:17:22.377: W/System.err(950):
12-05 12:17:22.377: W/System.err(950): Line 30: <error statusCode="404" redirect="filenotfound.htm" />
12-05 12:17:22.377: W/System.err(950): Line 31: </customErrors>
12-05 12:17:22.377: W/System.err(950): <font color=red>Line 32: <compilation debug="true" targetFramework="4.0">
12-05 12:17:22.396: W/System.err(950): </font>Line 33: <expressionBuilders>
12-05 12:17:22.396: W/System.err(950): Line 34: <add expressionPrefix="NopResources" type="NopSolutions.NopCommerce.BusinessLogic.Localization.NopResourceExpressionBuilder, Nop.BusinessLogic" /></pre></code>
12-05 12:17:22.396: W/System.err(950):
12-05 12:17:22.396: W/System.err(950): </td>
12-05 12:17:22.396: W/System.err(950): </tr>
12-05 12:17:22.396: W/System.err(950): </table>
12-05 12:17:22.396: W/System.err(950):
12-05 12:17:22.396: W/System.err(950): <br>
12-05 12:17:22.396: W/System.err(950):
12-05 12:17:22.396: W/System.err(950): <b> Source File: </b> C:\Websites\balajeebazaar\web.config<b> Line: </b> 32
12-05 12:17:22.396: W/System.err(950): <br><br>
12-05 12:17:22.396: W/System.err(950):
12-05 12:17:22.396: W/System.err(950): <hr width=100% size=1 color=silver>
12-05 12:17:22.407: W/System.err(950):
12-05 12:17:22.407: W/System.err(950): <b>Version Information:</b> Microsoft .NET Framework Version:2.0.50727.4963; ASP.NET Version:2.0.50727.4955
12-05 12:17:22.407: W/System.err(950):
12-05 12:17:22.407: W/System.err(950): </font>
12-05 12:17:22.407: W/System.err(950):
12-05 12:17:22.416: W/System.err(950): </body>
12-05 12:17:22.416: W/System.err(950): </html>
12-05 12:17:22.416: W/System.err(950): <!--
12-05 12:17:22.416: W/System.err(950): [ConfigurationErrorsException]: Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive. (C:\Websites\balajeebazaar\web.config line 32)
12-05 12:17:22.416: W/System.err(950): at System.Web.HttpRuntime.HostingInit(HostingEnvironmentFlags hostingFlags)
12-05 12:17:22.416: W/System.err(950): [HttpException]: Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive. (C:\Websites\balajeebazaar\web.config line 32)
12-05 12:17:22.416: W/System.err(950): at System.Web.HttpRuntime.FirstRequestInit(HttpContext context)
12-05 12:17:22.416: W/System.err(950): at System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context)
12-05 12:17:22.416: W/System.err(950): at System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context)
12-05 12:17:22.416: W/System.err(950): --><!--
12-05 12:17:22.426: W/System.err(950): This error page might contain sensitive information because ASP.NET is configured to show verbose error messages using <customErrors mode="Off"/>. Consider using <customErrors mode="On"/> or <customErrors mode="RemoteOnly"/> in production environments.-->
12-05 12:17:22.426: W/System.err(950): at org.json.JSONTokener.syntaxError(JSONTokener.java:448)
12-05 12:17:22.426: W/System.err(950): at org.json.JSONArray.<init>(JSONArray.java:104)
12-05 12:17:22.426: W/System.err(950): at org.json.JSONArray.<init>(JSONArray.java:150)
12-05 12:17:22.426: W/System.err(950): at cm.bzaar.CallWebservices.getCategory(CallWebservices.java:48)
12-05 12:17:22.426: W/System.err(950): at cm.bzaar.CategoryActivity$Loader.doInBackground(CategoryActivity.java:98)
12-05 12:17:22.426: W/System.err(950): at cm.bzaar.CategoryActivity$Loader.doInBackground(CategoryActivity.java:1)
12-05 12:17:22.436: W/System.err(950): at android.os.AsyncTask$2.call(AsyncTask.java:185)
12-05 12:17:22.436: W/System.err(950): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:256)
12-05 12:17:22.436: W/System.err(950): at java.util.concurrent.FutureTask.run(FutureTask.java:122)
12-05 12:17:22.436: W/System.err(950): at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:648)
12-05 12:17:22.436: W/System.err(950): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:673)
12-05 12:17:22.436: W/System.err(950): at java.lang.Thread.run(Thread.java:1060)
12-05 12:17:22.436: W/dalvikvm(950): threadid=17: thread exiting with uncaught exception (group=0x4001aa28)
12-05 12:17:22.446: E/AndroidRuntime(950): Uncaught handler: thread AsyncTask #1 exiting due to uncaught exception
12-05 12:17:22.446: E/AndroidRuntime(950): java.lang.RuntimeException: An error occured while executing doInBackground()
12-05 12:17:22.446: E/AndroidRuntime(950): at android.os.AsyncTask$3.done(AsyncTask.java:200)
12-05 12:17:22.446: E/AndroidRuntime(950): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:234)
12-05 12:17:22.446: E/AndroidRuntime(950): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:258)
12-05 12:17:22.446: E/AndroidRuntime(950): at java.util.concurrent.FutureTask.run(FutureTask.java:122)
12-05 12:17:22.446: E/AndroidRuntime(950): at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:648)
12-05 12:17:22.446: E/AndroidRuntime(950): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:673)
12-05 12:17:22.446: E/AndroidRuntime(950): at java.lang.Thread.run(Thread.java:1060)
12-05 12:17:22.446: E/AndroidRuntime(950): Caused by: java.lang.NullPointerException
12-05 12:17:22.446: E/AndroidRuntime(950): at cm.bzaar.CategoryActivity$Loader.doInBackground(CategoryActivity.java:100)
12-05 12:17:22.446: E/AndroidRuntime(950): at cm.bzaar.CategoryActivity$Loader.doInBackground(CategoryActivity.java:1)
12-05 12:17:22.446: E/AndroidRuntime(950): at android.os.AsyncTask$2.call(AsyncTask.java:185)
12-05 12:17:22.446: E/AndroidRuntime(950): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:256)
12-05 12:17:22.446: E/AndroidRuntime(950): ... 4 more
VEJA O SEGUINTE CÓDIGO:
code segmento em que a função é chamada para chamar o serviço da web:
@Override
protected Void doInBackground(Void... arg0) {
CategoryArray = new JSONArray();
CategoryArray = CW
.getCategory("url");
for (int i = 0; i <= CategoryArray.length() - 1; i++) {
try {
Log.v("category array : ", CategoryArray.getString(i));
String[] val = CategoryArray.getString(i).split("•");
CategoryID.add(i, val[0]);
CategoryList.add(i, val[1]);
} catch (JSONException e) {
e.printStackTrace();
}
}
adapter = new CategoryListAdapter(CategoryActivity.this,
CategoryList);
return null;
}
função para chamar o serviço da web:
public JSONArray getCategory(String URL){
try {
HttpPost request = new HttpPost(URL);
request.setHeader("Accept", "application/json");
request.setHeader("Content-type", "application/json");
// Send request to WCF service
DefaultHttpClient httpClient1 = new DefaultHttpClient();
HttpResponse response = httpClient1.execute(request);
Log.v("response code", response.getStatusLine().getStatusCode()
+ "");
responseCode = response.getStatusLine().getStatusCode();
// if(responseCode > 200){ // HERE I WS TRYING TO BREAK THE CODE AND TRYING TO RETURN NULL BT UNABLE TO DO SO
// CategoryArray = new JSONArray();
// CategoryArray.put(false);
// return null;
// }else{
HttpEntity responseEntity = response.getEntity();
// Read response data into buffer
char[] buffer = new char[(int) responseEntity.getContentLength()];
InputStream stream = responseEntity.getContent();
InputStreamReader reader = new InputStreamReader(stream);
reader.read(buffer);
stream.close();
CategoryArray = new JSONArray(new String(buffer));
Log.v("results length : ", CategoryArray.length() + "");
// }
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
return CategoryArray;
}
veja a linha em que estou comparando o código de resposta. Por favor, me guie sobre como posso quebrar meu código lá e mostrar um brinde à ui