How to change screen orientation, without creating a new activity on android? -

i not know if title correct, here happens.

i have application works differently on phone , on tablet, on phone shows portrait on tablet shows landscape.

to achieve created class called coreactivity extended activities , following:

public class coreactivity extends activity {     protected boolean _landscape = false;      public boolean isphone() {         int layoutsize = getscreenlayoutsize();         return (layoutsize == configuration.screenlayout_size_small || layoutsize == configuration.screenlayout_size_normal);     }      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         if (isphone() && !_landscape) {             this.setrequestedorientation(activityinfo.screen_orientation_portrait);         } else {             this.setrequestedorientation(activityinfo.screen_orientation_landscape);         }     }       protected int getscreenlayoutsize() {         return (getresources().getconfiguration().screenlayout & configuration.screenlayout_size_mask);     } } 

my problem occurs when wish show screen on phone setup on landscape mode, use following:

@override protected void oncreate(bundle savedinstancestate) {     _landscape = true     super.oncreate(savedinstancestate); } 

the problem is, on phone, if user holding phone on portrait mode (as 1 would, since of application in portrait mode) activity gets created , destroyed , recreated. if holding on landscape mode, created once.

my problem occurs because on oncreate method launch threads load data, , show fragments.

is there way avoid problem? there way launch activity start on portrait mode , not change it, or have not create twice?

thanks in advance can provide

recreating occurs because forcing to, calling setrequestedorientation in order set screen orientation. don't need check , change code. can via xml file. can set different xml files depending on screen size. little bit hack there no guarantee in future.

on manifest file can force by:

<activity    android:name="com.my.example.myactivity"    android:screenorientation="landscape"/>  // or portrait 

so far understand want force portrait small sizes , landscape(or sensor) larger screen sizes. above configuration applies screen sizes. here tricky part: landscape portrait sensor etc. integers defined here. might guess can write android:screenorientation=0 instead of landscape. know beginning lessons of android, can define integers in xml files values might vary on screen size. so..

you should first create different integers.xml files different screen sizes. i.e.:

values  - integers.xml values-large  - integers.xml 

for values/integers.xml:

<?xml version="1.0" encoding="utf-8"?> <resources>     <integer name="orientation">1</integer>  // 1 portrait </resources> 

for values-large/integers.xml:

<?xml version="1.0" encoding="utf-8"?> <resources>     <integer name="orientation">0</integer> // 0 landscape </resources> 

and you have manipulate manifest file by:

<activity    android:name="com.my.example.myactivity"    android:screenorientation="@integer/orientation"/>  // read constant xml files 

you can use sensor , fullsensor, nosensor, locked, behind, reverselandscape, reverseportait options too. warning you, hack solution.