`public class DisplayBills extends AppCompatActivity {


public Button mAddBtn;
private RecyclerView mRecyclerView;
private CustomRecyclerAdapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;

private EditText mOrder;
private EditText mDate;
private EditText mName;
private EditText mTdsin;
private EditText mTdsout;
private EditText mAmount;

private List<Data> mData = new ArrayList<>();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_display_bills);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    mAddBtn = (Button) findViewById(R.id.btn_add_bill);

    mAddBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            // Initializing views.
            mOrder = (EditText) findViewById(R.id.input_order_no);
            mDate = (EditText) findViewById(R.id.input_date);
            mName = (EditText) findViewById(R.id.input_c_name);
            mTdsin = (EditText) findViewById(R.id.input_tds_in);
            mTdsout = (EditText) findViewById(R.id.input_tds_out);
            mAmount = (EditText) findViewById(R.id.input_amount);
            mRecyclerView = (RecyclerView) findViewById(R.id.rv);

            // If the size of views will not change as the data changes.
            mRecyclerView.setHasFixedSize(true);

            // Setting the LayoutManager.
            mLayoutManager = new LinearLayoutManager(getApplicationContext());
            mRecyclerView.setLayoutManager(mLayoutManager);

            // Setting the adapter.
            mAdapter = new CustomRecyclerAdapter();
            mRecyclerView.setAdapter(mAdapter);
        }

        // Called when add button is clicked.
        public void addItem(View view) {

            // Add data locally to the list.
            Data dataToAdd = new Data(
                    Integer.parseInt(mOrder.getText().toString()),
                    Integer.parseInt(mDate.getText().toString()),
                    mName.getText().toString(),
                    Integer.parseInt(mTdsin.getText().toString()),
                    Integer.parseInt(mTdsout.getText().toString()),
                    Integer.parseInt(mAmount.getText().toString()));
            mData.add(dataToAdd);

            // Update adapter.
            mAdapter.addItem(mData.size() - 1, dataToAdd);
        }
    });


    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(getApplicationContext(),
                AddNewBill.class);

            // Start DisplayBills Activity
            startActivity(intent);
        }
    });

}

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.display_bills, menu);
        return true;
    }

`enter code here`<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">

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

    <android.support.v7.widget.RecyclerView
        android:id="@+id/rv"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    </android.support.v7.widget.RecyclerView>

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom|end"
    android:layout_margin="@dimen/fab_margin"
    android:src="@drawable/ic_add_white_24dp" />

public class AddNewBill extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_add_new_bill);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

}

<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">

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

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    android:layout_marginTop="?attr/actionBarSize"
    android:orientation="vertical"
    android:paddingLeft="20dp"
    android:paddingRight="20dp"
    android:paddingTop="10dp">

    <android.support.design.widget.TextInputLayout
        android:id="@+id/order"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <EditText
            android:id="@+id/input_order_no"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/hint_order"
            android:inputType="number"/>
    </android.support.design.widget.TextInputLayout>

    <android.support.design.widget.TextInputLayout
        android:id="@+id/date"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/order"
        android:layout_marginTop="4dp">

        <EditText
            android:id="@+id/input_date"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/hint_date"
            android:inputType="date"/>
    </android.support.design.widget.TextInputLayout>

    <android.support.design.widget.TextInputLayout
        android:id="@+id/cusname"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/date"
        android:layout_marginTop="4dp">

        <EditText
            android:id="@+id/input_c_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/hint_cname" />
    </android.support.design.widget.TextInputLayout>

    <android.support.design.widget.TextInputLayout
        android:id="@+id/tin"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/cusname"
        android:layout_marginTop="4dp">

        <EditText
            android:id="@+id/input_tds_in"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="number"
            android:hint="@string/hint_tdsin" />
    </android.support.design.widget.TextInputLayout>

    <android.support.design.widget.TextInputLayout
        android:id="@+id/tout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/tin"
        android:layout_marginTop="4dp">

        <EditText
            android:id="@+id/input_tds_out"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="number"
            android:hint="@string/hint_tdsout" />
    </android.support.design.widget.TextInputLayout>

    <android.support.design.widget.TextInputLayout
        android:id="@+id/tamount"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/tout"
        android:layout_marginTop="4dp">

        <EditText
            android:id="@+id/input_amount"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="number"
            android:hint="@string/hint_amount" />
    </android.support.design.widget.TextInputLayout>

    <Button android:id="@+id/btn_add_bill"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/btn_add_bill"
        android:background="@color/colorPrimary"
        android:layout_marginTop="40dp"
        android:textColor="@android:color/white"/>

</LinearLayout>