Android – Error inflating class android.support.design.widget.FloatingActionButton

I found the solution and it's to create the following theme in your styles-v21.xml (it should already be there if you imported the sample files, but if it is not there, please create it):

<style name="AppTheme.NoActionBar">
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
    <item name="android:windowDrawsSystemBarBackgrounds">true</item>
    <item name="android:statusBarColor">@android:color/transparent</item>
</style>

And calling it in the manifest, in the main activity part, as follows (delete the line I highlighted earlier and put this in its place):

android:theme="@style/AppTheme.NoActionBar">

this should solve the probleme.

for more explications: https://github.com/Marketcloud/marketcloud-sample-android-application/issues/1

Are you sure you are getting error in landscape mode? because in landscape its running fine and in portrait mode you are not using dynamic fragment so that you need to extend Fragment Activity instead of Activity to run the fragment. It would be good if you use dynamic fragment instead hard-coded.

Change your layout-port/main_activity to this

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout  xmlns:android="http://schemas.android.com/apk/res/android"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             android:id="@+id/phone_container2"
    >

  // remove hard coded fragment

</FrameLayout>

// your full solution

Main Activity

import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.app.ListFragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;

public class MainActivity extends Activity {

    // if run on phone, isSinglePane = true
    // if run on tablet, isSinglePane = false
    boolean isSinglePane;

    static String[] month ={
            "January", "February", "March", "April",
            "May", "June", "July", "August",
            "September", "October", "November", "December"};

    public static class MyListFragment extends ListFragment {

        @Override
        public void onActivityCreated(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onActivityCreated(savedInstanceState);

            ListAdapter myArrayAdapter =
                    new ArrayAdapter<String>(
                            getActivity(), android.R.layout.simple_list_item_1, month);
            setListAdapter(myArrayAdapter);

        }

    }

    public static class MyDetailFragment extends Fragment {

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            View view = inflater.inflate(R.layout.layout_detailfragment, null);
            return view;
        }

    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        View v = findViewById(R.id.phone_container);
        if(v == null){
            //it's run on tablet
            isSinglePane = false;

            //if's the first time created
            MyDetailFragment myListFragment = new MyDetailFragment();
            FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
            fragmentTransaction.add(R.id.phone_container2, myListFragment);
            fragmentTransaction.commit();



       /*
        * MyListFragment and MyDetailFragment have been loaded in XML,
        * no need load.
        */

        }else{
            //it's run on phone
            //Load MyListFragment programmatically
            isSinglePane = true;


                //if's the first time created
                MyListFragment myListFragment = new MyListFragment();
                FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
                fragmentTransaction.add(R.id.phone_container, myListFragment);
                fragmentTransaction.commit();

        }
    }
}

port:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             android:id="@+id/phone_container2"
    >

  <!--  <fragment
        android:id="@+id/titles"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />-->

</FrameLayout>

land:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              xmlns:tools="http://schemas.android.com/tools"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:paddingBottom="@dimen/activity_vertical_margin"
              android:paddingLeft="@dimen/activity_horizontal_margin"
              android:paddingRight="@dimen/activity_horizontal_margin"
              android:paddingTop="@dimen/activity_vertical_margin"
              android:orientation="vertical"
              tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Normal" />

    <FrameLayout
        android:id="@+id/phone_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </FrameLayout>

</LinearLayout>