有人了解Android动画吗?我想创建以下内容:
- 我在设备屏幕中心有一张大图片;
- 通过动画,该图片变小并移到设备屏幕的角落。
就像下面这个序列中的演示:
如有任何提示,将不胜感激!提前致谢!
ViewPropertyAnimator
,使用像scaleXBy()
和 translateYBy()
这样的方法。 在 API Level 11+ 上,您可以通过在View
上调用animate()
来获得 ViewPropertyAnimator
。 如果您支持旧设备,则NineOldAndroids提供了一个近似的后移版本。我有一个同时旋转和移动的类。虽然它的成本较高,但它可以在所有 API 版本上运行。
public class ResizeMoveAnimation extends Animation {
View view;
int fromLeft;
int fromTop;
int fromRight;
int fromBottom;
int toLeft;
int toTop;
int toRight;
int toBottom;
public ResizeMoveAnimation(View v, int toLeft, int toTop, int toRight, int toBottom) {
this.view = v;
this.toLeft = toLeft;
this.toTop = toTop;
this.toRight = toRight;
this.toBottom = toBottom;
fromLeft = v.getLeft();
fromTop = v.getTop();
fromRight = v.getRight();
fromBottom = v.getBottom();
setDuration(500);
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
float left = fromLeft + (toLeft - fromLeft) * interpolatedTime;
float top = fromTop + (toTop - fromTop) * interpolatedTime;
float right = fromRight + (toRight - fromRight) * interpolatedTime;
float bottom = fromBottom + (toBottom - fromBottom) * interpolatedTime;
RelativeLayout.LayoutParams p = (LayoutParams) view.getLayoutParams();
p.leftMargin = (int) left;
p.topMargin = (int) top;
p.width = (int) ((right - left) + 1);
p.height = (int) ((bottom - top) + 1);
view.requestLayout();
}
}