blackberry - アプリのホーム画面での Blackberry アニメーションの問題

Question

MyScreen画面の下部から中央に画像を浮かせる Blackberryのホーム画面 (以下) アニメーションを持つアプリケーションを作成しようとしています。その後、ログイン画面などを表示する別の画面をプッシュしたいと思います(NewScreen以下)。

アニメーションの後に空白の画面が表示されます。一度押し戻すと、アニメーション画面からプッシュした画面が表示されます。ガイドしてください: 完璧な結果を得るにはどこにプッシュすればよいですか?

import net.rim.device.api.animation.AnimatedScalar;
import net.rim.device.api.animation.Animation;
import net.rim.device.api.animation.Animator;
import net.rim.device.api.animation.AnimatorListener;
import net.rim.device.api.system.Bitmap;
import net.rim.device.api.system.Display;
import net.rim.device.api.system.EncodedImage;
import net.rim.device.api.ui.Color;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.Screen;
import net.rim.device.api.ui.TransitionContext;
import net.rim.device.api.ui.Ui;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.UiEngineInstance;
import net.rim.device.api.ui.container.MainScreen;
import net.rim.device.api.ui.container.PopupScreen;

/**
 * A class extending the MainScreen class, which provides default standard
 * behavior for BlackBerry GUI applications.
 */

public final class MyScreen extends MainScreen implements AnimatorListener {
    private RectangleToMove _rect;
    private Animator _animator;
    private Animation _xanimation;
    private Animation _yanimation;
    private boolean _bAnimating;
    public static final int BALL_WIDTH = 50;
    public Bitmap splashimg;

    static TransitionContext transitionContextIn;
    static TransitionContext transitionContextOut;
    static UiEngineInstance engine = Ui.getUiEngineInstance();

    /**
     * Creates a new MyScreen object
     */

    public MyScreen() {
        EncodedImage img = EncodedImage.getEncodedImageResource("logo.png");
        splashimg = img.getBitmap();
        _bAnimating = false;
        int midScreen = (Display.getWidth() / 2) - img.getWidth()/2;
        int endScreen = Display.getHeight();
        _rect = new RectangleToMove(midScreen, BALL_WIDTH);
        _animator = new Animator(30);
        _animator.setAnimatorListener(this);
        _yanimation = _animator.addAnimationFromTo(_rect.getY(),
                AnimatedScalar.ANIMATION_PROPERTY_SCALAR, endScreen
                        - BALL_WIDTH, Display.getHeight() / 2-30,
                Animation.EASINGCURVE_LINEAR, 3000L);
        _yanimation.setRepeatCount(1f);
        _yanimation.begin(0);


        UiApplication.getUiApplication().pushScreen(new NewScreen());

    }

    protected void paint(Graphics g) {
        if (_bAnimating) {
            _rect.draw(g, splashimg);
        }       
    }

    public void animatorUpdate() {
        invalidate();
        doPaint();      
    }

    public void animatorProcessing(boolean processing) {
        _bAnimating = processing;
    }


}

class RectangleToMove {
    private int xPos;
    private AnimatedScalar yPos;

    public void draw(Graphics g, Bitmap splashimg) {
        g.setBackgroundColor(Color.BLACK);
        g.clear();
        g.setColor(Color.SLATEGRAY);
        g.drawBitmap(xPos, yPos.getInt(), splashimg.getWidth(),
                splashimg.getHeight(), splashimg, 0, 0);
        /*
         * g.fillEllipse(xPos,yPos.getInt(),
         * xPos+MyScreen.BALL_WIDTH,yPos.getInt(),xPos,
         * yPos.getInt()+MyScreen.BALL_WIDTH,0,360);
         */
    }

    public int getX() {
        return xPos;
    }

    public AnimatedScalar getY() {
        return yPos;
    }

    RectangleToMove(int x, int y) {

        xPos = x;
        yPos = new AnimatedScalar(y);
    }    
}