MyActivity.java
package com.example.HelloAndroid;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.security.SecureRandom;

public class MyActivity extends FragmentActivity {
    private int counter = 0;

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

        findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                final FragmentManager manager = getSupportFragmentManager();
                final FragmentTransaction transaction = manager.beginTransaction();
                final Fragment fragment = TextFragment.newInstance(String.valueOf(counter++));

                final int enter = R.anim.slide_in_from_bottom;
                final int exit = R.anim.slide_out_to_bottom;
                final int popEnter = R.anim.slide_in_from_bottom;
                final int popExit = R.anim.slide_out_to_bottom;

                transaction.setCustomAnimations(enter, exit, popEnter, popExit);
                transaction.add(R.id.container, fragment);
                transaction.addToBackStack(fragment.getClass().getSimpleName());
                transaction.commit();
            }
        });
    }

    public static class TextFragment extends Fragment {
        public static TextFragment newInstance(String text) {
            final TextFragment fragment = new TextFragment();
            final Bundle bundle = new Bundle();

            bundle.putString("text", text);
            fragment.setArguments(bundle);

            return fragment;
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            final View view = inflater.inflate(R.layout.fragment, container, false);
            final TextView text = (TextView) view.findViewById(R.id.text);

            final String value = getArguments().getString("text");
            final int color = new SecureRandom().nextInt();

            view.setBackgroundColor(color);
            text.setText(value);

            return view;
        }
    }
}

main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:orientation="vertical">

	<FrameLayout
		android:id="@+id/container"
		android:layout_width="match_parent"
		android:layout_height="0dip"
		android:layout_weight="1"/>

	<Button
		android:id="@+id/button"
		android:layout_width="match_parent"
		android:layout_height="wrap_content"
		android:singleLine="true"
		android:text="Add fragment"/>

</LinearLayout>

fragment.xml
<?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">

	<TextView
		android:id="@+id/text"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_gravity="center"
		android:singleLine="true"
		android:textSize="50dip"/>

</FrameLayout>