Question

我的列表视图项目有ExpandAnimation：

public class ExpandAnimation extends Animation {
    private AnimationCompletedCallback callback = null;
    private View viewToAnimate = null;
    private RelativeLayout.LayoutParams viewToAnimateLayoutParams = null;
    private int marginStart = 0;
    private int marginEnd = 0;
    private boolean isVisibleAfter = false;
    private boolean isEndedAlready = false;

    public ExpandAnimation(AnimationCompletedCallback callback, View view, int duration) {
        this.setDuration(duration);

        this.callback = callback;

        this.viewToAnimate = view;
        this.viewToAnimateLayoutParams = (RelativeLayout.LayoutParams) view.getLayoutParams();

        this.isVisibleAfter = (view.getVisibility() == View.VISIBLE);

        this.marginStart = this.viewToAnimateLayoutParams.bottomMargin;
        this.marginEnd = (this.marginStart == 0 ? (0 - view.getHeight()) : 0);

        view.setVisibility(View.VISIBLE);
    }

    @Override
    protected void applyTransformation(float interpolatedTime, Transformation transformation) {
        super.applyTransformation(interpolatedTime, transformation);

        if (interpolatedTime < 1.0f) {
            this.viewToAnimateLayoutParams.bottomMargin = this.marginStart + (int) ((this.marginEnd - this.marginStart) * interpolatedTime);
            this.viewToAnimate.requestLayout();
        } else if (!this.isEndedAlready) {
            this.viewToAnimateLayoutParams.bottomMargin = this.marginEnd;
            this.viewToAnimate.requestLayout();

            if (this.isVisibleAfter) {
                this.viewToAnimate.setVisibility(View.GONE);
            }

            this.isEndedAlready = true;

            this.callback.onAnimationCompleted();
        }
    }
}

Thi Animation适用于Android 4.4+但是在Android 4.2上，例如动画就会被跳过。例如，当我将持续时间设置为500时，我看不到500毫秒，而且当我打开它时视图立即崩溃。没有任何事情发生在500毫秒，而且视图立即扩大。这意味着0到500毫秒之间的所有步骤都没有显示。

为什么？

Answer 1

奇怪。我正在使用var image = UIImage(named: "myimage.png");我现在切换到RelativeLayout并且动画现在可以正常工作。

Android 4.2中忽略了动画

1 个答案: