Utiliser des fragments dynamiques sous Android

Bonjour
Voici le code pour utiliser des fragments dynamiques sous Android:

public class DynamicActivity extends FragmentActivity {
private String mFragment;
private Dynamic1Fragment mDynamic1Fragment;
private Dynamic2Fragment mDynamic2Fragment;

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

mFragment = getIntent().getStringExtra("fragment");
setupFragments();
if (mFragment.equals("Dynamic1Fragment")) {
showFragment(this.mDynamic1Fragment);
} else if (mFragment.equals("Dynamic2Fragment")) {
showFragment(this.mDynamic2Fragment);
}
}

private void setupFragments() {
final FragmentManager fm = getSupportFragmentManager();

this.mDynamic1Fragment = (Dynamic1Fragment) fm
.findFragmentByTag(Dynamic1Fragment.TAG);
if (this.mDynamic1Fragment == null) {
this.mDynamic1Fragment = new Dynamic1Fragment();
}

this.mDynamic2Fragment = (Dynamic2Fragment) fm
.findFragmentByTag(Dynamic2Fragment.TAG);
if (this.mDynamic2Fragment == null) {
this.mDynamic2Fragment = new Dynamic2Fragment();
}
}

private void showFragment(final Fragment fragment) {
if (fragment == null)
return;

final FragmentManager fm = getSupportFragmentManager();
final FragmentTransaction ft = fm.beginTransaction();
// We can also animate the changing of fragment
ft.setCustomAnimations(android.R.anim.slide_in_left,
android.R.anim.slide_out_right);

ft.replace(R.id.frameLayoutListView, fragment);

ft.commit();
}

public void goToFragment1(View v) {
showFragment(this.mDynamic1Fragment);
}

public void goToFragment2(View v) {
showFragment(this.mDynamic2Fragment);
}
}