Android 卡片翻转

您好！对于Android卡片翻转，您可以使用Android的动画和布局来实现。以下是一个简单的示例代码，演示了如何实现一个卡片翻转效果：

1. 首先，在您的布局文件中定义两个View，一个用于显示卡片的正面，另一个用于显示卡片的背面。例如：

<RelativeLayout
    android:id="@+id/cardContainer"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout
        android:id="@+id/flipCardFrontView"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <!-- 正面布局 -->

    </FrameLayout>

    <FrameLayout
        android:id="@+id/flipCardBackView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="invisible">

        <!-- 背面布局 -->

    </FrameLayout>

</RelativeLayout>

2. 在您的Activity或Fragment中，获取对应的布局和视图，并设置翻转动画效果。例如：

private void flipCard() {
    View rootLayout = findViewById(R.id.cardContainer);
    View cardFrontView = findViewById(R.id.flipCardFrontView);
    View cardBackView = findViewById(R.id.flipCardBackView);

    FlipAnimation flipAnimation = new FlipAnimation(cardFrontView, cardBackView);

    if (cardFrontView.getVisibility() == View.GONE) {
        flipAnimation.reverse();
    }
    rootLayout.startAnimation(flipAnimation);
}

private class FlipAnimation extends Animation {
    private final Camera camera;
    private final View fromView;
    private final View toView;
    private float centerX;
    private float centerY;
    private boolean reverse = false;

    public FlipAnimation(View fromView, View toView) {
        this.fromView = fromView;
        this.toView = toView;
        camera = new Camera();        setDuration(500);
    }

    public void reverse() {
        reverse = true;
        View tempView = fromView;
        fromView = toView;
        toView = tempView;
    }

    @Override
    public void initialize(int width, int height, int parentWidth, int parentHeight) {
        super.initialize(width, height, parentWidth, parentHeight);
        centerX = width / 2;
        centerY = height / 2;
    }

    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {
        final float fromDegrees = 0;
        final float toDegrees = 180f;

        float degrees = fromDegrees + ((toDegrees - fromDegrees) * interpolatedTime);

        final float centerX = this.centerX;
        final float centerY = this.centerY;
        final Camera camera = this.camera;

        final Matrix matrix = t.getMatrix();

        camera.save();

        if (reverse) {
            camera.translate(0.0f, 0.0f, centerX * interpolatedTime);
        } else {
            camera.translate(0.0f, 0.0f, centerX * (1.0f - interpolatedTime));
        }

        camera.rotateY(degrees);

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

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

        if (interpolatedTime >= 0.5f) {
            fromView.setVisibility(View.GONE);
            toView.setVisibility(View.VISIBLE);
        }
    }
}

当调用 `flipCard()` 方法时，将会触发卡片的翻转效果。您可以根据自己的需求，修改正面和背面布局的内容以及翻转动画的配置。

希望这能帮到您！如果您有任何进一步的问题，请随时提问。