Question

i m new to android development. i am trying to insert data into remote Mysql database through php script using android’s HttpPost. i have added the permission for internet. i am getting forced closed error. My code is below:

   package com.regsiteration.regfi;

    import java.io.IOException;
    import java.util.ArrayList;
    import java.util.List;

    import org.apache.http.HttpResponse;
    import org.apache.http.NameValuePair;
    import org.apache.http.client.ClientProtocolException;
    import org.apache.http.client.HttpClient;
    import org.apache.http.client.entity.UrlEncodedFormEntity;
    import org.apache.http.client.methods.HttpPost;
    import org.apache.http.impl.client.DefaultHttpClient;
    import org.apache.http.message.BasicNameValuePair;

    import android.os.Bundle;
    import android.app.Activity;
    import android.view.Menu;

    public class Main extends Activity {


    public void postData() {
        // Create a new HttpClient and Post Header
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost("http://xyz.com/folder/register.php");

        try {
            // Add your data
            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
            nameValuePairs.add(new BasicNameValuePair("email", "[e-mail]"));
            nameValuePairs.add(new BasicNameValuePair("name", "robin hood"));
            nameValuePairs.add(new BasicNameValuePair("password", "1234590"));
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

            // Execute HTTP Post Request
            HttpResponse response = httpclient.execute(httppost);

        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
        } catch (IOException e) {
            // TODO Auto-generated catch block
        }
    } 

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //postData();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
    }

Please tell me what i am missing or doing wrong. Thanks in advance. Here is my logcat trace

08-17 20:16:49.530: I/dalvikvm(630): threadid=3: reacting to signal 3
08-17 20:16:49.654: I/dalvikvm(630): Wrote stack traces to '/data/anr/traces.txt'
08-17 20:16:49.779: D/AndroidRuntime(630): Shutting down VM
08-17 20:16:49.779: W/dalvikvm(630): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
08-17 20:16:49.799: E/AndroidRuntime(630): FATAL EXCEPTION: main
08-17 20:16:49.799: E/AndroidRuntime(630): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.regsiteration.regfi/com.regsiteration.regfi.Main}: android.os.NetworkOnMainThreadException
08-17 20:16:49.799: E/AndroidRuntime(630):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
08-17 20:16:49.799: E/AndroidRuntime(630):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
08-17 20:16:49.799: E/AndroidRuntime(630):  at android.app.ActivityThread.access$600(ActivityThread.java:123)
08-17 20:16:49.799: E/AndroidRuntime(630):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
08-17 20:16:49.799: E/AndroidRuntime(630):  at android.os.Handler.dispatchMessage(Handler.java:99)
08-17 20:16:49.799: E/AndroidRuntime(630):  at android.os.Looper.loop(Looper.java:137)
08-17 20:16:49.799: E/AndroidRuntime(630):  at android.app.ActivityThread.main(ActivityThread.java:4424)
08-17 20:16:49.799: E/AndroidRuntime(630):  at java.lang.reflect.Method.invokeNative(Native Method)
08-17 20:16:49.799: E/AndroidRuntime(630):  at java.lang.reflect.Method.invoke(Method.java:511)
08-17 20:16:49.799: E/AndroidRuntime(630):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
08-17 20:16:49.799: E/AndroidRuntime(630):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
08-17 20:16:49.799: E/AndroidRuntime(630):  at dalvik.system.NativeStart.main(Native Method)
08-17 20:16:49.799: E/AndroidRuntime(630): Caused by: android.os.NetworkOnMainThreadException
08-17 20:16:49.799: E/AndroidRuntime(630):  at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
08-17 20:16:49.799: E/AndroidRuntime(630):  at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
08-17 20:16:49.799: E/AndroidRuntime(630):  at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
08-17 20:16:49.799: E/AndroidRuntime(630):  at java.net.InetAddress.getAllByName(InetAddress.java:220)
08-17 20:16:49.799: E/AndroidRuntime(630):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
08-17 20:16:49.799: E/AndroidRuntime(630):  at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
08-17 20:16:49.799: E/AndroidRuntime(630):  at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
08-17 20:16:49.799: E/AndroidRuntime(630):  at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
08-17 20:16:49.799: E/AndroidRuntime(630):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
08-17 20:16:49.799: E/AndroidRuntime(630):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
08-17 20:16:49.799: E/AndroidRuntime(630):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
08-17 20:16:49.799: E/AndroidRuntime(630):  at com.regsiteration.regfi.Main.postData(Main.java:37)
08-17 20:16:49.799: E/AndroidRuntime(630):  at com.regsiteration.regfi.Main.onCreate(Main.java:50)
08-17 20:16:49.799: E/AndroidRuntime(630):  at android.app.Activity.performCreate(Activity.java:4465)
08-17 20:16:49.799: E/AndroidRuntime(630):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
08-17 20:16:49.799: E/AndroidRuntime(630):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
08-17 20:16:49.799: E/AndroidRuntime(630):  ... 11 more
08-17 20:16:49.960: I/dalvikvm(630): threadid=3: reacting to signal 3
08-17 20:16:49.970: I/dalvikvm(630): Wrote stack traces to '/data/anr/traces.txt'
08-17 20:16:50.340: I/dalvikvm(630): threadid=3: reacting to signal 3
08-17 20:16:50.350: I/dalvikvm(630): Wrote stack traces to '/data/anr/traces.txt'

Answer 1

Caused by: android.os.NetworkOnMainThreadException

This is your error. Network stuff can’t be done on the UI thread in newer SDK versions.
You can “override” this with

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