Android error "Unable to start activity" in main activity

Question

I'm following the first answer on this question, and it doesn't work! I don't know why; please, if someone can help me, it would be appreciated.

This is my code:

package com.example.enviarphp;

//All the import is here

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

     // Create a new HttpClient and Post Header
    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httppost = new HttpPost("http://appandroid.comuv.com/index.php");

    try {
        // Add your data
        Log.i( "Anda el try", "anda el try");
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
        nameValuePairs.add(new BasicNameValuePair("dato", "Probandooo"));
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
        Log.i( "se esta por ejecutar", "se esta por ejecutar");
        // Execute HTTP Post Request
        HttpResponse response = httpclient.execute(httppost);
        Log.i( "se ejecutar", "se ejecutar");
    } catch (ClientProtocolException e) {
        // TODO Auto-generated catch block
        throw new AssertionError("IO Error");
    } catch (IOException e) {
        // TODO Auto-generated catch block
        throw new AssertionError("Client Protocol Error");

    }
}

}

And this is my PHP file:

<?php

$conexion = mysql_connect("base","name","password") or die ("Error al conectar a la base de datos.");

 mysql_select_db("name2",$conexion);

 $dato = $_POST['dato'];

 $sql="INSERT INTO Mensajes(id,mensaje) VALUES(null,$dato)";

 mysql_query($sql);

 ?>

LogCat error:

06-17 16:09:24.779: I/Anda el try(9916): anda el try
06-17 16:09:24.829: I/se esta por ejecutar(9916): se esta por ejecutar
06-17 16:09:24.919: D/AndroidRuntime(9916): Shutting down VM
06-17 16:09:24.919: W/dalvikvm(9916): threadid=1: thread exiting with uncaught exception (group=0x40a4b1f8)
06-17 16:09:24.999: E/AndroidRuntime(9916): FATAL EXCEPTION: main
06-17 16:09:24.999: E/AndroidRuntime(9916): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.enviarphp/com.example.enviarphp.MainActivity}: android.os.NetworkOnMainThreadException
06-17 16:09:24.999: E/AndroidRuntime(9916):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2079)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2104)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at android.app.ActivityThread.access$600(ActivityThread.java:132)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1157)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at android.os.Handler.dispatchMessage(Handler.java:99)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at android.os.Looper.loop(Looper.java:137)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at android.app.ActivityThread.main(ActivityThread.java:4575)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at java.lang.reflect.Method.invokeNative(Native Method)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at java.lang.reflect.Method.invoke(Method.java:511)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at dalvik.system.NativeStart.main(Native Method)
06-17 16:09:24.999: E/AndroidRuntime(9916): Caused by: android.os.NetworkOnMainThreadException
06-17 16:09:24.999: E/AndroidRuntime(9916):     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at java.net.InetAddress.getAllByName(InetAddress.java:220)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at com.example.enviarphp.MainActivity.onCreate(MainActivity.java:39)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at android.app.Activity.performCreate(Activity.java:4465)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
06-17 16:09:24.999: E/AndroidRuntime(9916):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2033)
06-17 16:09:24.999: E/AndroidRuntime(9916):     ... 11 more

Thanks a lot! I hope somebody can help me with my problem, I've tried everything I know.

"it doesn't work" is a completely useless description of the problem. — CommonsWare, Jun 17 '13 at 19:20
And try echoing and printing some data to check the flow of code. — Veer Shrivastav, Jun 17 '13 at 19:20
Other than the wide open SQL injection vulnerability, what indication do you have that "it doesn't work"? Is there an error message? An unexpected behavior? We can't test this for you, you have to tell us what's going on at runtime. — David, Jun 17 '13 at 19:21
I'm uploading my logcat, the code works up to the logcat Log.i( "se ejecutar", "se ejecutar"); and from there all are errors — user2212773, Jun 17 '13 at 19:23
this answer will help you : http://stackoverflow.com/a/6343299/794088 — petey, Jun 17 '13 at 19:29
please try to use more descriptive question titles. Keep in mind this is the main resource used for searching for questions for future generations. — Ivaylo Strandjev, Jun 17 '13 at 19:32
yeah, when I know where the problem is I could put a reasonable title — user2212773, Jun 17 '13 at 19:34

score 1 · Accepted Answer · answered Jun 17 '13 at 19:39

1

Caused by: android.os.NetworkOnMainThreadException

You are performing network I/O on the main application thread. You need to move this to a background thread, perhaps one managed by an AsyncTask.

answered Jun 17 '13 at 19:39

CommonsWare

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Android error "Unable to start activity" in main activity

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