public class MainActivity extends FragmentActivity {



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Button button = (Button) findViewById(R.id.button);

        button.setOnClickListener(new OnClickListener() {

			@Override

			public void onClick(View v) {

				AnotherRightFragment fragment = new AnotherRightFragment();

				FragmentManager fragmentManager = getSupportFragmentManager();

				FragmentTransaction transaction = fragmentManager.beginTransaction();

				transaction.replace(R.id.right_layout, fragment);

				transaction.addToBackStack(null);

				transaction.commit();

			}

		});

    }

}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent" >



	<fragment

	    android:id="@+id/left_fragment"

	    android:name="edu.lzjtu.fragment.LeftFragment"

	    android:layout_width="0dp"

	    android:layout_height="match_parent"

	    android:layout_weight="1" />



	<FrameLayout

	    android:id="@+id/right_layout"

	    android:layout_width="0dp"

	    android:layout_height="match_parent"

	    android:layout_weight="1" >

	    

	    <fragment

	        android:id="@+id/right_fragment"

	        android:name="edu.lzjtu.fragment.RightFragment"

	        android:layout_width="match_parent"

	        android:layout_height="match_parent" />

	    

	</FrameLayout>

    

</LinearLayout>