<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:id="@+id/maintoolbar">

<android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/AppBarOverlay">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="@color/colorPrimary"
        app:popupTheme="@style/PopupOverlay"
        app:title="H20 Droid App " />

</android.support.design.widget.AppBarLayout>

<FrameLayout
    android:id="@+id/frame"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"></FrameLayout>

<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/buttonlayout">
<include
layout="@layout/buttons"/>
</LinearLayout>

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/newlayout"
    android:visibility="gone">
    <include
        layout="@layout/buttons" />
</LinearLayout>

cb6.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
            if (cb6.isChecked()) {

                editor.putBoolean("alt_layout",true);
                editor.putBoolean("checkbox6state", true);
                editor.commit();
                Log.i("Alt_Layout: ", "Activated");

            }else{
                editor.putBoolean("alt_layout",false);
                editor.putBoolean("checkbox6state", false);
                editor.commit();

                Log.i("Alt_Layout: ","Deactivated");
            }
        }
    });

Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    sharedpreferences = PreferenceManager.getDefaultSharedPreferences(this);
    boolean layout_alt = sharedpreferences.getBoolean("alt_layout",false);
    if (layout_alt==true){
        LinearLayout llnew= (LinearLayout)findViewById(R.id.newlayout);
        LinearLayout llnorm = (LinearLayout)findViewById(R.id.buttonlayout);
        llnew.setVisibility(View.VISIBLE);
        llnorm.setVisibility(View.GONE);
    }