android 细节之 旋转动画
16lz
2021-01-23
Flip Animation for Android:
近期项目中用到了一个小动画，让物体实现一定的3D旋转效果，现记录例如以下：
public class FlipAnimation extends Animation { private Camera mCamera; private View mFromView; private View mToView; private float mCenterX; private float mCenterY; private boolean mForward = true; /** * Creates a 3D flip animation between two views. * * @param fromView First view in the transition. * @param toView Second view in the transition. */ public FlipAnimation(View fromView, View toView) { mFromView = fromView; mToView = toView; setDuration(700); setFillAfter(false); setInterpolator(new AccelerateDecelerateInterpolator()); } public void reverse() { mForward = false; View switchView = mToView; mToView = mFromView; mFromView = switchView; } @Override public void initialize(int width, int height, int parentWidth, int parentHeight) { super.initialize(width, height, parentWidth, parentHeight); mCenterX = width / 2; mCenterY = height / 2; mCamera = new Camera(); } @Override protected void applyTransformation(float interpolatedTime, Transformation t) { final double radians = Math.PI * interpolatedTime; float degrees = (float)(180.0 * radians / Math.PI); if (interpolatedTime >= 0.5f) { degrees -= 180.f; mFromView.setVisibility(View.GONE); mToView.setVisibility(View.VISIBLE); } if (mForward) { degrees = -degrees; } final Matrix matrix = t.getMatrix(); mCamera.save(); mCamera.rotateY(degrees); mCamera.getMatrix(matrix); mCamera.restore(); matrix.preTranslate(-mCenterX, -mCenterY); matrix.postTranslate(mCenterX, mCenterY); }} 更多相关文章
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