android - Changing screen orientation makes login to begin again -

i have app login screen. when checking if login ok, show "loading" dialog.

if change screen orientation, dialogdisappears , think check of login starts again, app crashes after that.

i've read solutions, can't works.

here code:

mainactivity.java

public void entrar(view view) {          /* escondemos el teclado */     inputmethodmanager imm = (inputmethodmanager)getsystemservice(               context.input_method_service);     imm.hidesoftinputfromwindow(edittextusuario.getwindowtoken(), 0);     /* comprobamos si hay conexión internet */     if(myapplication.isonline()) {         loadingmaintask mywebfetch = new loadingmaintask(this);         mywebfetch.execute();     }     /* si no se dispone de conexión internet, mostramos un error */     else {         myapplication.mostrarmensaje(this, r.string.error_conexion_titulo,                  r.string.error_conexion_mensaje);     } }  private class loadingmaintask extends asynctask<string, void, boolean> {     private progressdialog dialog;     private volatile boolean running = true;     private mainactivity activity;     tuplausuario tuplausuario = new tuplausuario();      private loadingmaintask(mainactivity activity) {         this.activity = activity;         context = activity;         dialog = new progressdialog(context);         dialog.setcancelable(true);         dialog.setoncancellistener(new oncancellistener() {             @override             public void oncancel(dialoginterface dialog) {                 cancel(true);             }         });     }      /** application context. */     private context context;      @override     protected void oncancelled() {         running = false;     }      @override     protected void onpreexecute() {         this.dialog.setmessage(getstring(r.string.loading));         this.dialog.show();      }      @override     protected void onpostexecute(final boolean success) {         if (dialog.isshowing()) {             dialog.dismiss();         }          if (success) {             /* si el login no es correcto, mostramos un error por pantalla */             if (!tuplausuario.getok()) {                 myapplication.mostrarmensaje(activity, r.string.error_datos_login_titulo,                          tuplausuario.getmensaje());             }             /* entrar */             else {                 intent intent = new intent(activity, tabsfacturasactivity.class);                 startactivity(intent);             }         } else {             system.out.println("throw exception post");             myapplication.throwexception(activity);         }     }      @override     protected boolean doinbackground(final string... args) {             try{                     string usuario = string.valueof((edittextusuario).gettext());                 string password = string.valueof((edittextpassword).gettext());                  /* comprobar datos del login */                 try {                     tuplausuario = myapplication.getdatosusuario(usuario, password, loginguardado);                 } catch (jsonexception e) {                     myapplication.throwexception(activity);                     e.printstacktrace();                 } catch (illegalstateexception e) {                     myapplication.throwexception(activity);                     e.printstacktrace();                 } catch (ioexception e) {                     myapplication.throwexception(activity);                     e.printstacktrace();                 }                 /* si el login es correcto, nos guardamos su login, descargamos el resto                   * de información y entramos */                 if (tuplausuario.getok()) {                     boolean rememberme = myapplication.getrememberme();                     if (rememberme) {                         /* si el usuario ya estaba guardado, no hace falta volver guardarlo */                         if(!loginguardado) {                             myapplication.guardarusuario(activity, usuario, password);                         }                     }                 }                 return true;              } catch (exception e){                 return false;              }     } } 

androidmanifest.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" ... >  <application         android:allowbackup="true"         android:icon="@drawable/ic_launcher"         android:label="@string/app_name"         android:theme="@style/styledindicators"         android:configchanges="orientation"         android:name="com.example.factorenergia.myapplication" >         <activity             android:name="com.example.factorenergia.mainactivity"             android:label="@string/app_name"             android:configchanges="orientation"             android:theme="@style/apptheme"  >             <intent-filter>                 <action android:name="android.intent.action.main" />                  <category android:name="android.intent.category.launcher" />             </intent-filter>         </activity>          ...          </application>  </manifest> 

try in manifest...

<activity android:name="your activity name"              android:configchanges="keyboard|keyboardhidden|orientation|screenlayout|uimode|screensize|smallestscreensize" android:windowsoftinputmode="adjustpan"/>