加载毕加索图像后，HorizontalGridView/ RecyclerView 滚动位置会重置答案

【问题标题】：HorizontalGridView/ RecyclerView scroll position resets once Picasso image loads加载毕加索图像后，HorizontalGridView/ RecyclerView 滚动位置会重置
【发布时间】：2016-02-02 23:46:09
【问题描述】：

我有一个 HorizontalGridView 并且一切正常，但是我正在使用 Picasso 加载图像，并且每当加载图像时，HorizontalGridView 都会快速回到第一个项目/开始滚动位置。我在活动上也有一个地图片段，并注意到当与地图交互时，HorizontalGridView 显示相同的行为。下面是适配器代码。请帮助，已经卡在这个上几天了......

public class GridElementAdapter extends RecyclerView.Adapter<GridElementAdapter.SimpleViewHolder>{

private Context context;
private Deal[] mDeals;


public GridElementAdapter(Context context, Deal[] deals){
    this.context = context;
    this.mDeals = deals;

}

public static class SimpleViewHolder extends RecyclerView.ViewHolder {

    public final ImageView dealImage;
    public final TextView dealTitle;
    public final TextView dealSubtitle;
    public final TextView dealPrice;
    public final TextView dealTime;
    public final TextView dealDays;


    public SimpleViewHolder(View view) {
        super(view);

        dealImage = (ImageView) view.findViewById(R.id.gridDealImageView);
        dealTitle = (TextView) view.findViewById(R.id.gridTitleLabel);
        dealSubtitle = (TextView) view.findViewById(R.id.gridSubtitleLabel);
        dealPrice = (TextView) view.findViewById(R.id.gridPriceLabel);
        dealTime = (TextView) view.findViewById(R.id.gridAvailableTimeLabel);
        dealDays = (TextView) view.findViewById(R.id.gridAvailableDaysLabel);
    }
}

@Override
public SimpleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    final View view = LayoutInflater.from(this.context).inflate(R.layout.deal_grid_item, parent, false);
    return new SimpleViewHolder(view);
}

@Override
public void onBindViewHolder(SimpleViewHolder holder, final int position) {

    String dealImageUrl = "http://api.cheapeat.com.au/deals/" + mDeals[position].getPhotoId() + "/photo";

    Context context = holder.dealImage.getContext();
    Picasso.with(context).load(dealImageUrl).placeholder(R.drawable.deal_image_placeholder).into(holder.dealImage);
    holder.dealTitle.setText(mDeals[position].getName());
    holder.dealPrice.setText(mDeals[position].getPriceData());
    holder.dealSubtitle.setText(mDeals[position].getDescription());
    holder.dealTime.setText(mDeals[position].getAvailabilityTime());
    holder.dealDays.setText(mDeals[position].getFormattedAvailableDays(mDeals[position].getAvailabilityDay()));


}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public int getItemCount() {
    return this.mDeals.length;
}

}

【问题讨论】：

标签： java android android-recyclerview picasso

【解决方案1】：

所以我终于设法解决了这个问题。原来我没有为HorizontalGridView 设置LayoutManager。具体来说，在我设置适配器的活动中：

// Had this
horizontalGridView = (HorizontalGridView) findViewById(R.id.gridView);
GridElementAdapter adapter = newGridElementAdapter(VenueProfileActivity.this, mDeals);
horizontalGridView.setAdapter(adapter);

// This needed to be added
HorizontalGridView.LayoutManager layoutManager = new LinearLayoutManager(VenueProfileActivity.this, LinearLayoutManager.HORIZONTAL, false);
horizontalGridView.setLayoutManager(layoutManager);
horizontalGridView.setHasFixedSize(true);

希望这可以避免一些麻烦，因为我已经看到这个问题在没有正确解决方案的情况下四处流传。

【讨论】：