在Android中翻转双面硬币

我正在使用这个RotateDaniation类创建一个翻转硬币的动画，它也在移动和缩放。但我只能在一个图像视图中使用它。只需在该图像视图上使用startAnimation（）方法

但我想做的是，使用硬币的两面，让它看起来像一个真正的硬币，两面都在翻转。有人能帮我怎么做吗

谢谢

    package com.example.movingcoin;



    import android.view.animation.Animation;
    import android.view.animation.Transformation;
    import android.graphics.Camera;
    import android.graphics.Matrix;

    /**
     * An animation that rotates the view on the Y axis between two specified angles.
     * This animation also adds a translation on the Z axis (depth) to improve the effect.
     */
    public class Rotate3dAnimation extends Animation {
    private final float mFromDegrees;
    private final float mToDegrees;
    private final float mCenterX;
    private final float mCenterY;
    private final float mDepthZ;
    private final boolean mReverse;
    private Camera mCamera;

    /**
     * Creates a new 3D rotation on the Y axis. The rotation is defined by its
     * start angle and its end angle. Both angles are in degrees. The rotation
     * is performed around a center point on the 2D space, definied by a pair
     * of X and Y coordinates, called centerX and centerY. When the animation
     * starts, a translation on the Z axis (depth) is performed. The length
     * of the translation can be specified, as well as whether the translation
     * should be reversed in time.
     *
     * @param fromDegrees the start angle of the 3D rotation
     * @param toDegrees the end angle of the 3D rotation
     * @param centerX the X center of the 3D rotation
     * @param centerY the Y center of the 3D rotation
     * @param reverse true if the translation should be reversed, false otherwise
     */
    public Rotate3dAnimation(float fromDegrees, float toDegrees,
            float centerX, float centerY, float depthZ, boolean reverse) {
        mFromDegrees = fromDegrees;
        mToDegrees = toDegrees;
        mCenterX = centerX;
        mCenterY = centerY;
        mDepthZ = depthZ;
        mReverse = reverse;
    }

    @Override
    public void initialize(int width, int height, int parentWidth, int parentHeight) {
        super.initialize(width, height, parentWidth, parentHeight);
        mCamera = new Camera();
    }

    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {
        final float fromDegrees = mFromDegrees;
        float degrees = fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime);

        final float centerX = mCenterX;
        final float centerY = mCenterY;
        final Camera camera = mCamera;

        final Matrix matrix = t.getMatrix();

        camera.save();
        if (mReverse) {
            camera.translate(0.0f, 0.0f, mDepthZ * interpolatedTime);
        } else {
            camera.translate(0.0f, 0.0f, mDepthZ * (1.0f - interpolatedTime));
        }

//        camera.rotateY(degrees);
        camera.rotateX(degrees);

        camera.getMatrix(matrix);
        camera.restore();

        matrix.preTranslate(-centerX, -centerY);
        matrix.postTranslate(centerX, centerY);
    }
}

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几天前遇到同样的问题，在FlipAnimator类中找到了解决方案，您可以在这里找到：

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事实上，这很容易：你只需要把硬币的两面传给FlipAnimator。我认为这个类很容易理解，实际上它正在做g00dy在上面评论中建议的事情。

诀窍是将视图旋转两次！ 从正常位置转到中间位置后，更改视图（例如更改硬币的图像），然后将其从中间旋转回正常位置

您应该在第一个动画的AnimationListener中的onAnimationEnd中执行视图中的所有更改并开始从中间到法线的旋转

像这样：

firstAnimation.setAnimationListener(new Animation.AnimationListener() {
                    @Override
                    public void onAnimationStart(Animation animation) {

                    }

                    @Override
                    public void onAnimationEnd(Animation animation) {
                        findViewById(R.id.conceptsLay).setVisibility(View.GONE);
                        findViewById(R.id.factBaseLay).setVisibility(View.VISIBLE);
                        secondAnimation.startAnimation();
                    }

                    @Override
                    public void onAnimationRepeat(Animation animation) {

                    }
                });

在上面的代码中，我首先将conceptsLay旋转到中间，它基本上是不可见的，然后使它消失，并使其他示例视图可见，并从中间开始动画到正常！ 因此，用户看到的是视图被翻转！ 也就是说，首先将其从0旋转到90，然后在第二个动画中，将其从-90旋转到0

为了使它更平滑，我还添加了一些alpha动画！

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希望这将有助于

此转换发生了什么-硬币背面看起来如何-是正面的镜像图像吗？是的，它是X轴图像的镜像版本可以这样做：如果将转换应用于第二个图像（尾侧，如果我们考虑当前的头侧）并在不同的位置更改这两个的可见性，这可能会带来恶作剧-嗯？链接不再直接带您到源代码，因为它已存档，您必须下载源代码并在

androidwidgets/trunk/FlipAnimatorExample/src/com/beanie/examples/animation/FlipAnimator/FlipAnimator.java下导航