如何设置版式的宽度和高度的动画？

Question

我LinearLayout通过隐藏上的所有其他布局和视图将其扩展到全屏onClick。有一个Relativelayout上面LinearLayout

我想对此应用自定义动画。大小应缓慢增加（例如500毫秒）。

但是我怀疑这可能吗？谢谢。

这是我在做什么onClick：

private void expandView (int viewId) {
    RelativeLayout relativeLayout = (RelativeLayout) ((LinearLayout) view.findViewById(viewId)).getParent();
    ViewGroup.MarginLayoutParams rlMargin = (ViewGroup.MarginLayoutParams) relativeLayout.getLayoutParams();
    rlMargin.setMargins(0, 0, 0, 0);
    relativeLayout.setLayoutParams(rlMargin);
    LinearLayout linearLayout = (LinearLayout) relativeLayout.getParent();
    hideAllLinearLayoutExcept(linearLayout.getId());
    hideAllTilesExcept(viewId);
}

viewId是LinearLayout我点击的ID 。该函数从onClick()

Answer 1

当然可以。

只需编写自己的自定义动画并修改LayoutParams动画视图的。在此示例中，动画为动画视图的 高度 设置了动画。当然，
对宽度进行动画处理也是可能的 。

它看起来像这样：

public class ResizeAnimation extends Animation {

    private int startHeight;
    private int deltaHeight; // distance between start and end height
    private View view;

    /**
     * constructor, do not forget to use the setParams(int, int) method before
     * starting the animation
     * @param v
     */
    public ResizeAnimation (View v) {
        this.view = v;
    }

    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {

        view.getLayoutParams().height = (int) (startHeight + deltaHeight * interpolatedTime);
        view.requestLayout();
    }

    /**
     * set the starting and ending height for the resize animation
     * starting height is usually the views current height, the end height is the height
     * we want to reach after the animation is completed
     * @param start height in pixels
     * @param end height in pixels
     */
    public void setParams(int start, int end) {

        this.startHeight = start;
        deltaHeight = end - startHeight;
    }

    /**
     * set the duration for the hideshowanimation
     */
    @Override
    public void setDuration(long durationMillis) {
        super.setDuration(durationMillis);
    }

    @Override
    public boolean willChangeBounds() {
        return true;
    }
}

在代码中， 创建一个新的Animation并将其应用于 要设置动画 的RelativeLayout ：

RelativeLayout relativeLayout = (RelativeLayout) ((LinearLayout) view.findViewById(viewId)).getParent();

// getting the layoutparams might differ in your application, it depends on the parent layout
RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) relativeLayout.getLayoutParams();

ResizeAnimation a = new ResizeAnimation(relativeLayout);
a.setDuration(500);

// set the starting height (the current height) and the new height that the view should have after the animation
a.setParams(lp.height, newHeight);

relativeLayout.startAnimation(a);