[Résolu] Mettre en place l'animation sous Android

Bonjour
Voici un exemple qui mettre en place l'animation sous Android:
public class CrossfadeActivity extends Activity {

private View mContentView;
private View mLoadingView;
private int mShortAnimationDuration;

...

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

mContentView = findViewById(R.id.content);
mLoadingView = findViewById(R.id.loading_spinner);

// Initially hide the content view.
mContentView.setVisibility(View.GONE);

// Retrieve and cache the system's default "short" animation time.
mShortAnimationDuration = getResources().getInteger(
android.R.integer.config_shortAnimTime);
}