android.os.NetworkOnMainThreadExceptio

Question

in my app i call a webservice..... and it shows some error. the error is given below..

 04-26 10:00:53.682: E/AndroidRuntime(1600): FATAL EXCEPTION: main
 04-26 10:00:53.682: E/AndroidRuntime(1600): android.os.NetworkOnMainThreadException
 04-26 10:00:53.682: E/AndroidRuntime(1600):    at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
 04-26 10:00:53.682: E/AndroidRuntime(1600):    at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
 04-26 10:00:53.682: E/AndroidRuntime(1600):    at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
 04-26 10:00:53.682: E/AndroidRuntime(1600):    at libcore.io.IoBridge.connect(IoBridge.java:112)
 04-26 10:00:53.682: E/AndroidRuntime(1600):    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
 04-26 10:00:53.682: E/AndroidRuntime(1600):    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
 04-26 10:00:53.682: E/AndroidRuntime(1600):    at java.net.Socket.connect(Socket.java:842)
 04-26 10:00:53.682: E/AndroidRuntime(1600):    at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
 04-26 10:00:53.682: E/AndroidRuntime(1600):    at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)

i call the web service as given below....

DefaultHttpClient httpclient = new DefaultHttpClient();
HttpPost httpPostReq = new HttpPost(serverURL+url);
ObjectMapper mapper = new ObjectMapper();
StringEntity se = null;

try {
    String jSonString = mapper.writeValueAsString(obj);
    se = new StringEntity(jSonString);
    se.setContentType("application/json");
    httpPostReq.setEntity(se);
    httpResponse = httpclient.execute(httpPostReq);
    HttpEntity resultEntity = httpResponse.getEntity();
    inputStream=resultEntity.getContent();
    resultString = convertStreamToString(inputStream);
    Log.e("result",resultString);
}

but this one is working on the emulator.... but not working with device.. i test this using a wi-fi connected tablet... but its not working..... pls help.....me......

This exception is thrown when an application attempts to perform a networking operation on its main thread. Run your code in AsyncTask — rajeshwaran, Apr 26 '13 at 04:53
is that new thats for jellybean right because it doesnt matter earlier right? — JRowan, Apr 26 '13 at 04:55
@JRowan this exception is shown from honeycomb onwards,It allows to work on earlier version(before honeycomb) — Abx, Apr 26 '13 at 04:57
check this link: http://stackoverflow.com/questions/13136539/caused-by-android-os-networkonmainthreadexception hope it will help you. — Maulik, Apr 26 '13 at 05:17

Bhavesh Hirpara · Answer 1 · 2013-04-26T05:16:02.617

AsyncTask enables proper and easy use of the UI thread. This class allows to perform background operations and publish results on the UI thread without having to manipulate threads and/or handlers.

You should use AyncTask.

private class MyTask extends AsyncTask<URL, Integer, String> {
 protected Long doInBackground(URL... urls) {
    DefaultHttpClient httpclient = new DefaultHttpClient();
    HttpPost httpPostReq = new HttpPost(urls[0]);
    ObjectMapper mapper = new ObjectMapper();
    StringEntity se = null;

    try {
        String jSonString = mapper.writeValueAsString(obj);
        se = new StringEntity(jSonString);
        se.setContentType("application/json");
        httpPostReq.setEntity(se);
        httpResponse = httpclient.execute(httpPostReq);
        HttpEntity resultEntity = httpResponse.getEntity();
        inputStream=resultEntity.getContent();
        resultString = convertStreamToString(inputStream);
        Log.e("result",resultString);
        }
         return resultString;
 }

 protected void onProgressUpdate(Integer... progress) {
     // progress
 }

 protected void onPostExecute(String result) {
     // result
 }
}

use like

 new MyTask().execute(serverURL+url);

score 0 · Answer 2 · answered Apr 26 '13 at 05:09

0

Use this code It will help,

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);

answered Apr 26 '13 at 05:09

No_Rulz

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It may work but that a very bad practice I wouldn't recommend. The exception was added to prevent what you are suggesting in the first place.
AsyncTasks are here for it. – Lazy Ninja Apr 26 '13 at 05:48

android.os.NetworkOnMainThreadExceptio

2 Answers2