Android Rotate3dAnimation 实现图片 3D 旋转动画示例

利用 Android 的 Rotate3dAnimation 实现了图片 3D 旋转的动画，围绕 Y 轴进行旋转，还可以实现 Z 轴的缩放。点击开始按钮开始旋转，点击结束按钮停止旋转。

Rotate3dAnimation.java

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
     *  centerX the X center of the 3D rotation
     *  centerY the Y center of the 3D rotation
     *  reverse true if the translation should be reversed, false otherwise
     */
      {
        mFromDegrees = fromDegrees;
        mToDegrees = toDegrees;
        mCenterX = centerX;
        mCenterY = centerY;
        mDepthZ = depthZ;
        mReverse = reverse;
    }

    
       {
        .initialize(width, height, parentWidth, parentHeight);
        mCamera =  ();
    }

    
       {
            mFromDegrees;
           fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime);
            mCenterX;
            mCenterY;
            mCamera;
            t.getMatrix();
        
        camera.save();
         (mReverse) {
            camera.translate(, , mDepthZ * interpolatedTime);
        }  {
            camera.translate(, , mDepthZ * ( - interpolatedTime));
        }
        
        camera.rotateY(degrees);
        
        camera.getMatrix(matrix);
        
        camera.restore();
        matrix.preTranslate(-centerX, -centerY);
        matrix.postTranslate(centerX, centerY);
    }
}