How to use Data Binding with distinct layouts on Android?

Question

I’m making a app Android that displays a list of addresses and a map with these addresses.

Vertically, the two fragments appear on tabs inside a viewPager.

/res/layout/activity_main.xml

<layout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:ads="http://schemas.android.com/apk/res-auto"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools">

<RelativeLayout
    android:id="@+id/mainContainerV"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorPrimaryDark"
    tools:context=".MainActivity"
    >

    <LinearLayout
        android:id="@+id/myContainerV"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_above="@+id/adView"
        android:layout_alignParentTop="true"
        android:fitsSystemWindows="true"
        android:orientation="vertical">

        <android.support.design.widget.AppBarLayout
            android:id="@+id/appBarV"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbarV"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/colorPrimary"
                app:layout_scrollFlags="scroll|enterAlways"
                app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />

            <android.support.design.widget.TabLayout
                android:id="@+id/tabs"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@color/cardview_light_background"
                android:theme="@style/ThemeOverlay.AppCompat"
                app:tabGravity="fill"
                app:tabMode="fixed"/>
        </android.support.design.widget.AppBarLayout>

        <android.support.v4.view.ViewPager
            android:id="@+id/viewpagerV"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_behavior="@string/appbar_scrolling_view_behavior" />

    </LinearLayout>

    <com.google.android.gms.ads.AdView
        android:id="@+id/adView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_gravity="center|bottom"
        ads:adSize="BANNER"
        ads:adUnitId="XXXXXX" />

</RelativeLayout>
</layout>

and horizontal are two panels that appear side by side:

/res/layout-land/activity_main.xml

<layout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:ads="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools">

<RelativeLayout
    android:id="@+id/mainContainerH"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:id="@+id/myContainerH"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:baselineAligned="false"
        android:fitsSystemWindows="true"
        android:orientation="horizontal">

        <fragment
            android:id="@+id/runPanel"
            android:name="br.com.cadima.motonoix.fragments.ListFragment"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            tools:layout="@layout/fragment_recycler" />

        <fragment
            android:id="@+id/markersMapPanel"
            android:name="br.com.cadima.motonoix.fragments.MarkersFragment"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            tools:layout="@layout/fragment_map"

            />

    </LinearLayout>

    <com.google.android.gms.ads.AdView
        android:id="@+id/adView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"

        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        ads:adSize="BANNER"
        ads:adUnitId="XXXXXXX" />

</RelativeLayout>
</layout>

I am trying to use databinding and for this, on onCreate of MainActivity, the variable of Binding is generated:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
        final ActivityMainBinding activityMainBinding = DataBindingUtil.setContentView(this, R.layout.activity_main);

    if (getResources().getConfiguration().orientation == ORIENTATION_LANDSCAPE) {
               // se o layout estiver na horizontal...


    } else {
            // se estiver na vertical, ajusta o `viewPager`
        setupViewPager(activityMainBinding.viewpagerV);
        tabLayout.setupWithViewPager(viewPager);
    }

}

The problem is that when the two layouts are present in the project, only the folder /layout-land is accessible by activityMainBinding. and these last lines give error because the symbol cannot be solved.

    } else {
            // se estiver na vertical, ajusta o `viewPager`
        setupViewPager(activityMainBinding.viewpagerV);
        tabLayout.setupWithViewPager(viewPager);
    }

When I delete the horizontal layout, views from the vertical layout are accessible.

How to use databinding with distinct layouts?

UPDATE: THE app is already working. I want to improve the performance and so I decided to adopt the data.

I’ve researched before asking and seen some branch breakers, how to use a single layout.xml and disable views by code, but I have several layouts according to orientation and language... Imagine the nightmare of having to keep it all by code.

This layout does not have an associated data model, but the fragments it will show will. And because the app has multiple languages and different layouts for screen size, an easy way to realize the data is essential.

Maybe it is better to leave for an alternative as Butter Knife.

The most important thing is to improve performance and as the Binding data crosses the UI once, it gives an interesting gain.

Answer 1

Apparently, the errors were even Android Studio. The solution for the IDE to be able to 'see' views of both layouts (default and land) was done in three steps:

1)

File > Invalidate Cache / restart...

2)

Build > Clean Project

3)

Build > Rebuild Project

The APP is not yet as intended, but the reason for the question has been resolved in this way.