<?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:background="#00ff00"
 android:orientation="vertical" >
 <TextView
 android:id="@+id/fragment_text"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="this is fragment 1"
 android:textColor="#000000"
 android:textSize="25sp" />
</LinearLayout>

<?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:background="#ffff00"
 android:orientation="vertical" >
 <TextView
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="this is fragment 2"
 android:textColor="#000000"
 android:textSize="25sp" />
 <Button
 android:id="@+id/button"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="num 1" />
 <Button
 android:id="@+id/button2"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="num 2" />
 <Button
 android:id="@+id/button3"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="num 3" />
</LinearLayout>

package lgx.fram.framents;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class Fragment1 extends Fragment {
 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
  Bundle savedInstanceState) {
 return inflater.inflate(R.layout.fragment1, container, false);
 }
}

package lgx.fram.framents;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

public class Fragment2 extends Fragment {
 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
  Bundle savedInstanceState) {
 return inflater.inflate(R.layout.fragment2, container, false);
 }

 TextView textview;
 Button button, button2, button3;

 @Override
 public void onActivityCreated(Bundle savedInstanceState) {
 super.onActivityCreated(savedInstanceState);
 button = (Button) getActivity().findViewById(R.id.button);
 button2 = (Button) getActivity().findViewById(R.id.button2);
 button3 = (Button) getActivity().findViewById(R.id.button3);
 textview = (TextView) getActivity().findViewById(R.id.fragment_text);
 button.setOnClickListener(new OnClickListener() {

  @Override
  public void onClick(View v) {
  textview.setText(button.getText());
  }
 });
 button2.setOnClickListener(new OnClickListener() {

  @Override
  public void onClick(View v) {
  textview.setText(button2.getText());
  }
 });
 button3.setOnClickListener(new OnClickListener() {

  @Override
  public void onClick(View v) {
  textview.setText(button3.getText());
  }
 });
 }
}
button = (Button) getActivity().findViewById(R.id.button); 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/main_layout"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:baselineAligned="false"
 android:orientation="horizontal" >
 <fragment
 android:id="@+id/fragment1"
 android:name="lgx.fram.framents.Fragment1"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:layout_weight="1" />
 <fragment
 android:id="@+id/fragment2"
 android:name="lgx.fram.framents.Fragment2"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:layout_weight="1" />
</LinearLayout>

package lgx.fram.framents;

import android.app.Activity;
import android.os.Bundle;


public class FragmentActivity extends Activity {

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

}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/main_layout"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:baselineAligned="false"
 android:orientation="horizontal" >
</LinearLayout>

package lgx.fram.framents;

import android.os.Bundle;
import android.app.Activity;
import android.view.Display;
import android.view.Menu;

public class FragmentActivity extends Activity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_fragment);
 Display display = getWindowManager().getDefaultDisplay();
 if (display.getWidth() > display.getHeight()) {
  Fragment1 fragment1 = new Fragment1();
  getFragmentManager().beginTransaction()
   .replace(R.id.main_layout, fragment1).commit();
 } else {
  Fragment2 fragment2 = new Fragment2();
  getFragmentManager().beginTransaction()
   .replace(R.id.main_layout, fragment2).commit();
 }
 }

}