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我使用的是RecyclerView水平LinearLayoutManager的。我每个视图显示 3 个项目并使用无限滚动。我的问题是它们是 3 张图像，我希望将中间图像放大 2 倍，但我无法控制控制器来解决这个问题，有没有办法做到这一点？

例如）[] [] [] = 一个视图，但中间的一个将是 2X 大小，用户可以左右滚动

代码片段：这是我在活动中初始化适配器的方式：

LinearLayoutManager layout
            = new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL, false);

    // constant data
    constants = new Constants();
    recyclerView = (RecyclerView) findViewById(R.id.ModelCarousal);
    recyclerView.setLayoutManager(layout);
    recyclerView.setAdapter(new Model_Controller(getApplicationContext(), constants.Constants()));
    recyclerView.addOnScrollListener(new EndlessScrollListener(layout) {
        @Override
        public void onLoadMore(int page, int totalItemsCount) {
            // Triggered only when new data needs to be appended to the list

        }
    });

适配器：

  public class Model_Controller extends   RecyclerView.Adapter<Model_Controller.MyViewHolder> {
 Context mContext;
 List<Model> models;
 int[] img = new int[]{R.drawable.ic_item,R.drawable.ic_item,R.drawable.ic_item,R.drawable.ic_item
             ,R.drawable.ic_item,R.drawable.ic_item,R.drawable.ic_item,R.drawable.ic_item,R.drawable.ic_item
                ,R.drawable.ic_item,R.drawable.ic_item,R.drawable.ic_item,R.drawable.ic_item,R.drawable.ic_item};

// view holder of badges
public class MyViewHolder extends RecyclerView.ViewHolder {
    public ImageView viewTwo;

    public MyViewHolder(View view) {
        super(view);
        viewTwo = (ImageView) view.findViewById(R.id.model_child);

    }
}

// constructor
public Badge_Controller(Context c, List<Model> modelSet){
    mContext = c;
    models = modelSet;
}

int height;
int width;
// returning the set of the holder for the child layout of badge view
@Override
public Model_Controller.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View itemView = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.model_child, parent, false);
    height = parent.getMeasuredHeight() * 4;
    width = parent.getWidth()*2;
    return new MyViewHolder(itemView);
}

// what the user is seeing
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ) {
        Helpers helpers = new Helpers();
        holder.viewTwo.setImageDrawable(mContext.getDrawable(img[position]));
    }
}

// size
@Override
public int getItemCount() {
    return models.size()+2;
}
@Override
public int getItemViewType(int position) {
    if (position == 0 || position == getItemCount()-1) {
        return 1;
    }
    return 2;
}
}
4

2 回答 2

1

试试这个 ....

首先在 Recycler 适配器中声明常量

private static final int TYPE_1X = 0;
private static final int TYPE_2X = 1;

获取回收站物品的位置

   @Override
    public int getItemViewType(int position) {
        final int type = position % 3;

        switch (type) {
            case 1:
                return TYPE_2X;
        }
        return TYPE_1X;
    }

获取视图类型并根据视图类型调整 2X。

@Override
public Model_Controller.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

final int type = viewType;
View itemView = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.model_child, parent, false);
  switch (type) {
                case TYPE_1X:
                    height = parent.getMeasuredHeight() / 2;
                    width = parent.getWidth()/2;
                    break;
                case TYPE_2X:
                     height = parent.getMeasuredHeight() ;
                    width = parent.getWidth();
                    break;

            }
     RecyclerView.LayoutParams lp = new RecyclerView.LayoutParams(
           width, //width
           height);//height
   itemView.setLayoutParams(lp);
    return new MyViewHolder(itemView);
}
于 2016-11-29T06:12:48.437 回答
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好的@Kiran Dsouza你的答案是正确的我不得不改变相对布局参数，它适用于第一个初始视图，但是当我水平滚动并返回时它不再起作用，因为它返回到原来的视图。

于 2016-11-30T23:26:31.627 回答