Null exception in httprequest

Question

I am trying to get values form mysql(xampp) database but its not working my database name is meeting_planner and table name is participant

try {

                HttpPost httppost;

                HttpClient httpclient;

                httpclient = new DefaultHttpClient();

                httppost = new HttpPost(

                "http://10.10.10.159/my_folder_inside_htdocs/getdata.php");

                System.out.println("after url");

                ResponseHandler<String> responseHandler = new BasicResponseHandler();

                System.out.println("after response handler");

                 final String response = httpclient.execute(httppost,

                        responseHandler);




                 System.out.println("the response is "+response);

                 Log.e("pass 1", "connection success ");

            } catch (Exception e) {
                  e.printStackTrace();

            }

getdata.php code is here

<?php

     mysql_connect("localhost","admin","admin"); // host, username, password...

   mysql_select_db("meeting_planner"); // db name...


    $q=mysql_query("SELECT * FROM participant");

    while($row=mysql_fetch_assoc($q))

            $json_output[]=$row;

          print(json_encode($json_output));

    mysql_close();

?>

the response variable is null in result of System.out.println("response"+response); log cat is here

android.os.NetworkOnMainThreadException

at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1145)

at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)

at libcore.io.IoBridge.connectErrno(IoBridge.java:127)

at libcore.io.IoBridge.connect(IoBridge.java:112)

at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)

at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)

at java.net.Socket.connect(Socket.java:843)

at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)

at

org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOpera

tor.java:144)

at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)

at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)

at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)

at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)

at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:653)

at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:627)

at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:616)

at com.example.androidmeetingplanner.Invite.addListenerOnButton(Invite.java:130)

at com.example.androidmeetingplanner.Invite.onCreate(Invite.java:39)

at android.app.Activity.performCreate(Activity.java:5231)

at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)

at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)

at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)

at android.app.ActivityThread.access$800(ActivityThread.java:135)

at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)

at android.os.Handler.dispatchMessage(Handler.java:102)

at android.os.Looper.loop(Looper.java:136)

at android.app.ActivityThread.main(ActivityThread.java:5017)

at java.lang.reflect.Method.invokeNative(Native Method)

Sadia, please post your error here. I think you doing wrong call request. — Pratik Dasa, Nov 19 '14 at 11:39
yet another `android.os.NetworkOnMainThreadException` .... before asking question you should do at least minimal effort and do some research(googling) on your own ! — Selvin, Nov 19 '14 at 11:51

score 0 · Answer 1 · answered Nov 19 '14 at 11:50

0

android.os.NetworkOnMainThreadException said that you call request in GUI thread. You should do all operations with network in another thread.

For example, you can add this code into AsyncTask.

answered Nov 19 '14 at 11:50

Suvitruf - Andrei Apanasik

5,582
9
49
88

score 0 · Accepted Answer · answered Nov 19 '14 at 11:55

You are getting NetworkOnMainThreadException. please use AsyncTask to make HttpRequest like the following:

    private class HttpGetter extends AsyncTask<Void, Void, Void> {

            @Override
            protected Void doInBackground(URL... urls) {
                try {
                    HttpClient httpclient = new DefaultHttpClient();
                    HttpPost httppost= new HttpPost(          "http://10.10.10.159/my_folder_inside_htdocs/getdata.php");
                    System.out.println("after url");
                    ResponseHandler<String> responseHandler = new BasicResponseHandler();
                    System.out.println("after response handler");
                    String response = httpclient.execute(httppost,responseHandler);
                    System.out.println("the response is "+response);
                    Log.e("pass 1", "connection success ");
            } catch (Exception e) {
              e.printStackTrace();
            }   
            return null; 
        }
}

And in your activity write the following code to execute it

    HttpGetter getter = new HttpGetter();
    getter.execute(null,null);

score 0 · Answer 3 · edited May 23 '17 at 10:26

0

Please check this reference: How to fix android.os.NetworkOnMainThreadException? . Android cannot let you make an http request on main Thread, you should make a request on different thread

edited May 23 '17 at 10:26

Community

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1

answered Nov 19 '14 at 12:04

Unii

1,587
15
33

Null exception in httprequest

3 Answers3