扩大recyclerview项目 [英] expanding recyclerview item

问题描述

如果我在recyclerview中扩展了任何项目，则它可以很好地扩展，但是当我向下滚动recylerview时，我发现其他项目也已扩展，由于回收，它采用了扩展后的尺寸而不是原始尺寸.

if i expand any item in the recyclerview it expands fine but when i scroll down the recylerview i found other items also expanded , due to recycling it took the expanded size not the original one

 public class FeedAdapter extends RecyclerView.Adapter<FeedAdapter.MyViewHolder> implements View.OnClickListener {

    private LayoutInflater inflater;
    private Context mcontext;
    private int mOriginalHeight = 0;
    private boolean mIsViewExpanded = false;

    public FeedAdapter(Context context) {
        inflater = LayoutInflater.from(context);
        mcontext = context;

    }


    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {

        View view = inflater.inflate(R.layout.custom_row, viewGroup, false);
        MyViewHolder holder = new MyViewHolder(view);
        holder.frame.setOnClickListener(this);


        return holder;
    }

    @Override
    public void onBindViewHolder(MyViewHolder myViewHolder, int i) {


    }

    @Override
    public int getItemCount() {
        return 100;
    }

    @Override
    public void onClick(final View v) {
        if (mOriginalHeight == 0) {
            mOriginalHeight = v.getHeight();
        }
        ValueAnimator valueAnimator;
        if (v.getHeight() < (mOriginalHeight + (int) (mOriginalHeight * 1.5))) {
            valueAnimator = ValueAnimator.ofInt(mOriginalHeight, mOriginalHeight + (int) (mOriginalHeight * 1.5));
        } else {
            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();
                v.getLayoutParams().height = value.intValue();
                v.requestLayout();
            }
        });
        valueAnimator.start();

    }

    class MyViewHolder extends RecyclerView.ViewHolder {


        FrameLayout frame;

        public MyViewHolder(View itemView) {

            super(itemView);
            frame = (FrameLayout) itemView.findViewById(R.id.base);

        }
    }
}

所以 我该如何解决这个问题，还有一种更好的方法来展开和折叠物品吗?

so how do i fix that and also is there a better way to expand and collapse items ?

推荐答案

我遇到了同样的问题.发生这种情况是由于ViewHolderPattern.

I ran into the same issue. This happens because of the ViewHolderPattern.

https://developer.android.com/reference/android/support/v7/widget/RecyclerView.ViewHolder.html#isRecyclable%28%29

无论视图是否展开，Android都会回收视图. 因此，请告诉android，如果您的视图被扩展，则该视图不可回收.

Android will recycle the view, regardlessly if it's expanded or not. So tell android that if your view is expanded, it is not recyclable.

在您的ViewHolder类中添加:

In Your ViewHolder Class add:

public MyViewHolder(View itemView) {

   super(itemView);
   frame = (FrameLayout) itemView.findViewById(R.id.base);

   frame.setTag(this); // to get a reference to viewholder later on
}

在您的OnClick方法中添加:

In Your OnClick Method add:

@Override

public void onClick(final View v) {

   MyViewHolder holder = (MyViewHolder) v.getTag();
   holder.setIsRecyclable(false);


    if (mOriginalHeight == 0) {
        mOriginalHeight = v.getHeight();
    }
    ValueAnimator valueAnimator;
    ...
}

这应该可以解决您的问题. 请记住，在视图不再扩展后，再次将"setIsRecyclable()"设置为true，以便android可以对其进行回收. 希望我能帮上忙.

This should solve Your Problem. Remember to set "setIsRecyclable()" to true again after the view isn't expanded any more so that android can recycle it. Hope I could help.

欢呼声

Florestan

Florestan

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