可扩展列表与回收人员视图？

Question

是否可以将可展开的列表项与新的 RecyclerView 一起使用？喜欢 ExpandableListView？

Answer 1

https://github.com/gabrielemariotti/cardslib

这个库实现了一个带有recyclerview的可扩展列表(参考“CardViewNative”下的演示应用程序)

Answer 2

从这里获取示例代码实现

在ViewHolder的onClick内设置值Animator

@Override
public void onClick(final View view) {
    if (mOriginalHeight == 0) {
        mOriginalHeight = view.getHeight();
    }
    ValueAnimator valueAnimator;
    if (!mIsViewExpanded) {
        mIsViewExpanded = true;
        valueAnimator = ValueAnimator.ofInt(mOriginalHeight, mOriginalHeight + (int) (mOriginalHeight * 1.5));
    } else {
        mIsViewExpanded = false;
        valueAnimator = ValueAnimator.ofInt(mOriginalHeight + (int) (mOriginalHeight * 1.5), mOriginalHeight);
    }
    valueAnimator.setDuration(300);
    valueAnimator.setInterpolator(new LinearInterpolator());
    valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        public void onAnimationUpdate(ValueAnimator animation) {
            Integer value = (Integer) animation.getAnimatedValue();
            view.getLayoutParams().height = value.intValue();
            view.requestLayout();
        }
    });
    valueAnimator.start();

}

这是最终的代码

public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
    private TextView mFriendName;
    private int mOriginalHeight = 0;
    private boolean mIsViewExpanded = false;


    public ViewHolder(RelativeLayout v) {
        super(v);
        mFriendName = (TextView) v.findViewById(R.id.friendName);
        v.setOnClickListener(this);
    }

    @Override
    public void onClick(final View view) {
        if (mOriginalHeight == 0) {
            mOriginalHeight = view.getHeight();
        }
        ValueAnimator valueAnimator;
        if (!mIsViewExpanded) {
            mIsViewExpanded = true;
            valueAnimator = ValueAnimator.ofInt(mOriginalHeight, mOriginalHeight + (int) (mOriginalHeight * 1.5));
        } else {
            mIsViewExpanded = false;
            valueAnimator = ValueAnimator.ofInt(mOriginalHeight + (int) (mOriginalHeight * 1.5), mOriginalHeight);
        }
        valueAnimator.setDuration(300);
        valueAnimator.setInterpolator(new LinearInterpolator());
        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            public void onAnimationUpdate(ValueAnimator animation) {
                Integer value = (Integer) animation.getAnimatedValue();
                view.getLayoutParams().height = value.intValue();
                view.requestLayout();
            }
        });
        valueAnimator.start();

    }
}

Answer 3

使用股票布局管理器很容易做到这一点，这完全取决于您如何管理您的适配器。

当您想要展开一个部分时，您只需在标题之后向适配器添加新项目即可。请记住在执行此操作时调用 notifyItemRangeInserted。要折叠一个部分，您只需删除相关项目，然后调用 notifyItemRangeRemoved（）。对于收到适当通知的任何数据更改，回收程序视图将对视图进行动画处理。添加项目时，将创建一个要用新项目填充的区域，新项目将淡入。删除则相反。除了适配器之外，您需要做的就是设置视图的样式，以将逻辑结构传达给用户。

更新：Ryan Brooks现在已经写了一篇关于如何做到这一点的文章。