我滚动之前，RecyclerView不会更新子级 [英] RecyclerView won't update child until I scroll

问题描述

我认为我已经阅读了所有关于所有类似SO问题的所有答案，并且没有一个似乎对我有用.这让我发疯，而我为此花了太多时间.

I think I've read pretty much all the answers to all of the similar SO questions, and NONE of them seem to be working for me. It's driving me nuts, and I've spent too much time on this.

我正在实现RecyclerView

I'm implementing a RecyclerView here and I can't for the life of me update it's children. What happens is that after I update nothing changes on the screen, UNLESS I start scrolling. Once I scroll it updates perfectly.

这是我的代码:

public void updateDataAtIndex(final int indexToUpdate, ReadableMap updatedChild) {
    if (updatedChild != null) {
        if (this.data != null && this.data.size() > indexToUpdate) {
            this.data.set(indexToUpdate, updatedChild);
            final SPAdapter self = this;
            new Handler(Looper.getMainLooper()).post(new Runnable() {
                public void run() {
                    System.out.println("\n@@@@@@@@@@@@@@@@@ Updating: "+indexToUpdate);
                    self.notifyItemChanged(indexToUpdate);
                }
            });
        }
    }
}

这是完整的适配器:

Here's the full adapter: https://github.com/SudoPlz/react-native-synchronous-list/blob/master/lib/android/src/main/java/com/sudoplz/rnsynchronouslistmanager/Views/List/SPAdapter.java#L109

推荐答案

这是本机问题¯\_(ツ)_/¯.

我已经通过拦截requestLayout来解决了这个问题，

I've resolved this by intercepting requestLayout like so:

protected boolean mRequestedLayout = false;

@Override
    public void requestLayout() {
        super.requestLayout();
        // We need to intercept this method because if we don't our children will never update
        // Check https://stackoverflow.com/questions/49371866/recyclerview-wont-update-child-until-i-scroll
        if (!mRequestedLayout) {
            mRequestedLayout = true;
            this.post(new Runnable() {
                @SuppressLint("WrongCall")
                @Override
                public void run() {
                    mRequestedLayout = false;
                    layout(getLeft(), getTop(), getRight(), getBottom());
                    onLayout(false, getLeft(), getTop(), getRight(), getBottom());
                }
            });
        }
    }

终于可以了. 归功于

FINALLY it works.. Credit goes to this unsung hero who discovered the workaround.

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