如何禁用RecyclerView项目装修图纸为项目动画的持续时间 [英] How to disable RecyclerView item decoration drawing for the duration of item animations

问题描述

我有一些基本项目的点缀得出了一些东西，在 ItemDecoration.onDrawOver 方法。

I have some basic item decoration which draws some stuff in ItemDecoration.onDrawOver method.

本 RecyclerView 也有 DefaultItemAnimator 设置就可以了。
动画工作，全部是伟大的。除了一件事。

This RecyclerView also has DefaultItemAnimator set on it. Animations are working, all is great. Except one thing.

在所有现有项目都与此适配器设置一个新的项目交换，而动画运行正在显示的装饰品。

When all existing items are swapped with a new item set in this adapter, the decorations are being shown while animation is running.

我需要一种方法来隐藏他们。
当动画结束后，他们需要被显示，但在运行时，它们必须被隐藏。

I need a way to hide them. When animation finishes, they need to be shown, but while it is running, they must be hidden.

我试过如下：

public void onDrawOver(..., RecyclerView.State state) {
    if(state.willRunPredictiveAnimations() || state.willRunSimpleAnimations()) {
        return;
    }
    // else do drawing stuff here
}

，但这是没有帮助。装修只为动画的短期内拆除，但随后再次出现，同时它仍在运行。

but this isn't helping. Decoration is only removed for the short period of animation, but then appears again while it is still running.

的还设置包括 RecyclerView.Adapter 这hasStableIds（）（在该位问题的情况下）。的

Also setup includes a RecyclerView.Adapter which hasStableIds() (in case that bit matters).

推荐答案

这可能有些你所使用的类型依赖动画，但至少 DefaultItemAnimator 你需要考虑到在X /动画时正在做Y平移。你可以用获取这些值child.getTranslationX（）和 child.getTranslationY（）。

It may depend somewhat on the type animation you're using, but at least for DefaultItemAnimator you need to account for the X/Y translation being done during the animation. You can get these values with child.getTranslationX() and child.getTranslationY().

例如，对于垂直情况下的onDraw / onDrawOver ：

For example, for the vertical case of onDraw/onDrawOver:

private void drawVertical(Canvas c, RecyclerView parent) {
    final int left = parent.getPaddingLeft();
    final int right = parent.getWidth() - parent.getPaddingRight();
    final int childCount = parent.getChildCount();
    final int dividerHeight = mDivider.getIntrinsicHeight();

    for (int i = 1; i < childCount; i++) {
        final View child = parent.getChildAt(i);
        final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
        final int ty = (int)(child.getTranslationY() + 0.5f);
        final int top = child.getTop() - params.topMargin + ty;
        final int bottom = top + dividerHeight;
        mDivider.setBounds(left, top, right, bottom);
        mDivider.draw(c);
    }
}

（您可能preFER使用 ViewCompat.getTranslationY（子）如果您需要支持＆LT; API 11）

(You may prefer to use ViewCompat.getTranslationY(child) if you need to support < API 11.)

注：其它类型的动画，其他调整可能需要作出。 （例如，水平译文还可能需要考虑。）

Note: for other types of animations, additional adjustments may need to be made. (For example, horizontal translation might also need to be accounted for.)

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