In The below example I have created a recyclerview app, in this app I have used CardView. First I have added I have added first RecyclerView , CardView and design support  library in  build.gradle file .Now I have created RecyclerView and FloatingActionButton within Framelayout in main_activity.xml layout, In next step i have created a new dialog.xml layout here I have added TextView, EditView, Button and Spinner. After then in fourth step I have created a new item.xml layout here I have added CardView, ImageView and TextView. Now see programming area here I have created emp class and MyAdapter class within MyAdapter class I have created ViewHolder class and In MainActivity I have used DialogBox fuction. You can see below program it will clearly describe you how to add floating action button with RecyclerView xml layout in android.

Step(1)-I have added RecyclerView, CardView and design library in build.gradle file -
     

compile 'com.android.support:recyclerview-v7:22.2.1'
      compile 'com.android.support:cardview-v7:22.2.1'
      compile 'com.android.support:design:22.2.1'

Step(2)activity_main.xml -
 

<FrameLayout 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:layout_margin="10dp"
    tools:context=".MainActivity">
    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyle_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|right"
        android:layout_marginBottom="10dp"
        android:layout_marginRight="10dp"
        android:src="@mipmap/one"
        app:fabSize="normal" />

</FrameLayout>

Step(3)Created a new dialog.xml layout-
 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <TextView
          android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="0.5"
            android:gravity="center"
            android:text="UserName"/>
        <EditText
            android:id="@+id/name"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="0.5"
            android:inputType="textCapSentences"/>

    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

       <TextView
           android:layout_width="0dp"
           android:layout_height="wrap_content"
           android:layout_weight="0.5"
           android:gravity="center"
           android:text="Address"/>
        <EditText
            android:id="@+id/address"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="0.5"
            android:inputType="text"/>

    </LinearLayout>


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_weight="0.5"
            android:gravity="center"
            android:text="Gender"/>
        <Spinner
            android:id="@+id/gender"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="0.5"
            android:inputType="text"/>


    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
       <Button
           android:id="@+id/btn_ok"
           android:layout_width="0dp"
           android:layout_height="wrap_content"
           android:layout_gravity="center"
           android:layout_weight="0.5"
           android:gravity="center"
           android:text="Ok"/>
        <Button
            android:id="@+id/btn_cancel"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="0.5"
            android:text="cancel"/>

    </LinearLayout>
</LinearLayout>

Step(4)-Created a new item.xml layout-

 

<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:cardview="http://schemas.android.com/apk/res-auto"
    android:id="@+id/card_view"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="6dp">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <ImageView
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:id="@+id/image"
            android:padding="5dp"
            android:src="@mipmap/ic_launcher"/>
        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
           <TextView
               android:id="@+id/name"
               android:layout_width="match_parent"
               android:layout_height="wrap_content"
               android:text="jhjhjhnjhnjhn"
               android:textColor="@android:color/holo_blue_dark"/>
            <TextView
                android:id="@+id/address"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_below="@+id/name"
                android:text="sfdfsdfsd"
                android:textColor="@android:color/holo_green_dark"
                android:textStyle="bold" />


        </RelativeLayout>
    </LinearLayout>
    </android.support.v7.widget.CardView>

Step(5)Created Emp class-
  

  public class Emp {
    private String name;
    private String address;
    private boolean gender;

    public Emp(String name,boolean gender,String address){
        this.name=name;
        this.gender=gender;
        this.address=address;

    }
    public String getName(){
        return  name;
    }

    public Boolean isGender(){
        return gender;
    }


    public String getAddress(){
        return address;

    }

}

Step(6)-Created MyAdapter class-
 

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {

    private List<Emp> emp;
    private Activity activity;

    public MyAdapter(Activity activity, List<Emp> friends) {
        this.emp = friends;
        this.activity = activity;
    }
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
        LayoutInflater inflater =activity.getLayoutInflater();
        View view =inflater.inflate(R.layout.item, viewGroup, false);
        ViewHolder viewHolder = new ViewHolder(view);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(MyAdapter.ViewHolder viewHolder, int position) {
          viewHolder.name.setText(emp.get(position).getName());
        viewHolder.address.setText(emp.get(position).getAddress());
        if (emp.get(position).isGender()) {
            viewHolder.imageView.setImageResource(R.drawable.male);
        }else {
            viewHolder.imageView.setImageResource(R.drawable.female);

        }
        viewHolder.container.setOnClickListener(onClickListener(position));
    }
    private void setDataToView(TextView name,TextView address,ImageView genderIcon,int position){
        name.setText(emp.get(position).getName());
        address.setText(emp.get(position).getAddress());
        if (emp.get(position).isGender()) {
            genderIcon.setImageResource(R.drawable.male);
        }else{
            genderIcon.setImageResource(R.drawable.female);

        }

    }

    @Override
    public int getItemCount() {
        return (null !=emp?emp.size():0);
    }
    private View.OnClickListener onClickListener(final int position){
        return new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final Dialog dialog = new Dialog(activity);
                dialog.setContentView(R.layout.item);
                dialog.setTitle("Position" + position);
                dialog.setCancelable(true);

                TextView name =(TextView)dialog.findViewById(R.id.name);
                TextView address=(TextView)dialog.findViewById(R.id.address);
                ImageView icon = (ImageView) dialog.findViewById(R.id.image);
                setDataToView(name,address,icon,position);
                dialog.show();
            }
        };
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        private ImageView imageView;
        private TextView name;
        private  TextView address;
        private   View container;

        public ViewHolder(View view) {
            super(view);
            imageView = (ImageView) view.findViewById(R.id.image);
            name = (TextView) view.findViewById(R.id.name);
            address = (TextView) view.findViewById(R.id.address);
            container = view.findViewById(R.id.card_view);
        }
    }
}

Step(7)MainActivity-
 

public class MainActivity extends AppCompatActivity {

    private RecyclerView recyclerView;
    private MyAdapter adapter;
    private ArrayList<Emp>empArrayList;
    private FloatingActionButton fab;
    private  boolean gender;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        empArrayList = new ArrayList<>();

        recyclerView = (RecyclerView) findViewById(R.id.recyle_view);
        fab = (FloatingActionButton) findViewById(R.id.fab);

        recyclerView.setHasFixedSize(true);

        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);


        setRecyclerViewData(); //adding data to array list
        adapter = new MyAdapter(this, empArrayList);
        recyclerView.setAdapter(adapter);

        fab.setOnClickListener(onAddingListener());
    }

    private void setRecyclerViewData() {
        empArrayList.add(new Emp("RajShekhar", false, "Name Of Employee"));
        empArrayList.add(new Emp("Kanpur", true, "Address"));

    }

    private View.OnClickListener onAddingListener() {
        return new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final Dialog dialog = new Dialog(MainActivity.this);
                dialog.setContentView(R.layout.dialog); //layout for dialog
                dialog.setTitle("Add a new friend");
                dialog.setCancelable(false); //none-dismiss when touching outside Dialog

                // set the custom dialog components - texts and image
                EditText name = (EditText) dialog.findViewById(R.id.name);
                EditText job = (EditText) dialog.findViewById(R.id.address);
                Spinner spnGender = (Spinner) dialog.findViewById(R.id.gender);
                View btnAdd = dialog.findViewById(R.id.btn_ok);
                View btnCancel = dialog.findViewById(R.id.btn_cancel);

                //set spinner adapter
                ArrayList<String> gendersList = new ArrayList<>();
                gendersList.add("Male");
                gendersList.add("Female");
                ArrayAdapter<String> spnAdapter = new ArrayAdapter<String>(MainActivity.this,
                        android.R.layout.simple_dropdown_item_1line, gendersList);
                spnGender.setAdapter(spnAdapter);

                //set handling event for 2 buttons and spinner
                spnGender.setOnItemSelectedListener(onItemSelectedListener());
                btnAdd.setOnClickListener(onConfirmListener(name, job, dialog));
                btnCancel.setOnClickListener(onCancelListener(dialog));

                dialog.show();
            }
        };
    }

    private AdapterView.OnItemSelectedListener onItemSelectedListener() {
        return new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView parent, View view, int position, long id) {
                if (position == 0) {
                    gender = true;
                } else {
                    gender = false;
                }
            }

            @Override
            public void onNothingSelected(AdapterView parent) {

            }
        };
    }

    private View.OnClickListener onConfirmListener(final EditText name, final EditText job, final Dialog dialog) {
        return new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Emp friend = new Emp(name.getText().toString().trim(), gender, job.getText().toString().trim());

                //adding new object to arraylist
                empArrayList.add(friend);

                //notify data set changed in RecyclerView adapter
                adapter.notifyDataSetChanged();

                //close dialog after all
                dialog.dismiss();
            }
        };
    }

    private View.OnClickListener onCancelListener(final Dialog dialog) {
        return new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dialog.dismiss();
            }
        };
    }
}