Question

I have problems with fragment when the screen orientation changes.
In my code, I have create different layout xml according to the screen orientation.
For example, I have header_landscape.xml and header_portrait.xml in the layout directory. And each different header has the same fragment in the linear layout. So when I turn my device, I have the error “duplicate id …” that corresponding to my fragment.

The differences between layout is the content.When I am in “landscape” I display more informations than I am in “portrait”.

On create of my activity :

 setContentView(R.layout.main_landscape); 

                //header
                date=(TextView)findViewById(R.id.headerLandscapeDate);
                routeSens=(TextView) findViewById(R.id.headerLandscapeRouteSens);
                pkHeader=(TextView) findViewById(R.id.headerLandscapePk);

                //Récupération de la listview créée dans le fichier main.xml
                maListViewPerso = (ListView) findViewById(R.id.ListeChoix);      

                //On attribut à notre listView l'adapter que l'on vient de créer
                maListViewPerso.setAdapter(chargeMenu());

$ The code of the modification of layout when the orientation screen changes.

 public void onConfigurationChanged(Configuration newConfig)
 {
        super.onConfigurationChanged(newConfig);


        // Checks the orientation of the screen
        if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE && isLoaded && oldScreenStateOrientation!=newConfig.orientation)
        {

            setContentView(R.layout.main_landscape);

            //header
            date=(TextView)findViewById(R.id.headerLandscapeDate);
            routeSens=(TextView) findViewById(R.id.headerLandscapeRouteSens);
            pkHeader=(TextView) findViewById(R.id.headerLandscapePk);

            maListViewPerso = (ListView) findViewById(R.id.ListeChoix);  
            //On attribut à notre listView l'adapter que l'on vient de créer
            maListViewPerso.setAdapter(chargeMenu());
        } else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT && isLoaded && oldScreenStateOrientation!=newConfig.orientation)
        {

            setContentView(R.layout.main_portrait);


            routeSens=(TextView) findViewById(R.id.headerPortraitRouteSens);
            pkHeader=(TextView) findViewById(R.id.headerPortraitPk);

            maListViewPerso = (ListView) findViewById(R.id.ListeChoix);  
            //On attribut à notre listView l'adapter que l'on vient de créer
            maListViewPerso.setAdapter(chargeMenu());
        }
      }

If anyone have a solution.
I developp with the api8 (compatibility library fragment).

Sorry for my english.

Thanks

Answer 1

You should let android do all that configuration switching for you! Don’t do anything in “onConfigurationChanged”, remove all configuration changes from your manifest even!

Put your portrait layout in
layout/ folder

and put your landscape layout in
layout-land/ folder

Make sure they are both named: main.xml (or anything, as long as it is the same)

Then in your activity.onCreate, do something like this:

    // Will automatically select the correct layout
    setContentView(R.layout.main); 

    //header
    // If this is in portrait, date will be null. Check for that later
    date=(TextView)findViewById(R.id.headerDate);
    routeSens=(TextView) findViewById(R.id.headerRouteSens);
    pkHeader=(TextView) findViewById(R.id.headerPk);

    //Récupération de la listview créée dans le fichier main.xml
    maListViewPerso = (ListView) findViewById(R.id.ListeChoix);      

    //On attribut à notre listView l'adapter que l'on vient de créer
    maListViewPerso.setAdapter(chargeMenu());

This way, you can let android worry about which configuration to use. If you only want to display the landscape view on large screens, you could put it in a folder such as layout-w1024dp. This way you can have multiple layouts very easily.