当在adapter中扩展视图的布局时，您可以通过编程方式设置它们的高度。为了评估要使用的适当高度，您可以依赖父ViewGroup（即RecyclerView本身）。下面是一个示例：

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View itemView = mLayoutInflater.inflate(R.layout.view_item, parent, false);
    // work here if you need to control height of your items
    // keep in mind that parent is RecyclerView in this case
    int height = parent.getMeasuredHeight() / 4;
    itemView.setMinimumHeight(height);
    return new ItemViewHolder(itemView);        
}

希望这能帮上忙。

自支持库25.1.0起，以上答案不起作用。我建议进行以下修改：

public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false);
        GridLayoutManager.LayoutParams lp = (GridLayoutManager.LayoutParams) v.getLayoutParams();
        lp.height = parent.getMeasuredHeight() / 4;
        v.setLayoutParams(lp);
        return new ViewHolder(v);
    }

您不需要设置项目的高度。这里的问题是图像试图填充所有的空间。只需将android:adjustViewBounds="true"添加到ImageView，它不会添加空格

在onCreateViewHolder内部，只需

v.getLayoutParams().width = parent.getMeasuredWidth() / 2;

或

v.getLayoutParams().height = parent.getMeasuredWidth() / 2;

Kotlin版本

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
    val binding = ItemBinding.inflate(
        LayoutInflater.from(parent.context),
        parent,
        false
    )
    binding.root.post {
        binding.root.layoutParams.height = parent.width/3
        binding.root.requestLayout()
    }
    return ViewHolder(binding)
}

这里3是GridLayoutManager的跨度计数。如果不使用数据绑定，可以将binding.root替换为itemView

有时，在适配器中获取充气视图大小返回0或负值。另一种方法是从适配器外部获取所需的大小，对其进行操作并将其设置到视图中。在我例子中，另一个问题是大小设置无效。所以我用布局参数设置尺寸
下面是在活动中设置适配器：

Display display = MainActivity.this.getWindowManager().getDefaultDisplay();
                    Point size = new Point();
                    display.getSize(size);
                    int  y = size.y;
                    y=(int)y/2;
 GridLayoutManager linearLayoutManager = new GridLayoutManager(MainActivity.this,2);
                    recyclerView.setLayoutManager(linearLayoutManager);
                    NewOrderAdapter newOrderAdapter=new NewOrderAdapter(MainActivity.this,arrayListname,arrayListimage,y);
                    recyclerView.setAdapter(newOrderAdapter);

我这样设置视图大小：

@Override
    public myviewholder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View view = inflator.inflate(R.layout.new_order_row, viewGroup, false);
        GridLayoutManager.LayoutParams params = (GridLayoutManager.LayoutParams) view.getLayoutParams();
        params.height = ysize;
        view.setLayoutParams(params);
        myviewholder holder = new myviewholder(view);
        return holder;
    }

并且不要忘记在布局中设置高度以进行初始化

在最近的API级别（当前为25）上，onCreateViewHolder中距回收器的高度始终为空。这段代码用于在调用回收器视图的onMeasure后设置高度，并为膨胀的列表视图设置正确的高度。

@Override
public DataBindingViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) {
    // You may inflate your view here.
    parent.post(new Runnable() {

        @Override
        public void run() {
            int height = parent.getMeasuredHeight() / rows;
            View view = holder.getBinding().getRoot();
            view.getLayoutParams().height = height;
        }
    });
    return holder;
}

这是我的代码，用于根据实际的纵横比调整回收视图元素的高度。

@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View itemView = LayoutInflater.from(parent.getContext()) .inflate(R.layout.adapter_offers, parent, false);

    int width =  parent.getMeasuredWidth();
    float height = (float) width / Config.ASPECT_RATIO;//(Width/Height)
    RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) itemView.getLayoutParams();
    params.height = Math.round(height);
    itemView.setLayoutParams(params);
    return new MyViewHolder(itemView);
}

我有一个类似的要求，需要一个动态的高度为每一行在网格中的能力，以添加和删除项目的RecyclerView以及。在onCreateViewHolder中设置高度布局参数的问题是，当从RecyclerView中添加/删除一个项目时，该视图被回收，并且不再调用onCreateViewHolder，而是重用池中的视图（如果可用），布局管理器将计算项目的高度/宽度，我们将丢失原始的预期高度/宽度。宽度设置在onCreateViewHolder中。
下面的方法可能会帮助那些面临类似问题的人。
这里的关键步骤是扩展GridLayoutManager并覆盖以下内容-

1. generateDefaultLayoutParams
2. generateLayoutParams
3. checkLayoutParams
   布局管理器看起来像这样-

SpanGridLayoutManager : GridLayoutManager {

constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int, defStyleRes: Int) :
        super(context, attrs, defStyleAttr, defStyleRes)

constructor(context: Context, spanCount: Int) : super(context, spanCount)
constructor(context: Context, spanCount: Int, orientation: Int, reverseLayout: Boolean) :
        super(context, spanCount, orientation, reverseLayout)

override fun generateDefaultLayoutParams(): RecyclerView.LayoutParams {
    return spanLayoutSize(super.generateDefaultLayoutParams())
}

override fun generateLayoutParams(c: Context, attrs: AttributeSet): RecyclerView.LayoutParams {
    return spanLayoutSize(super.generateLayoutParams(c, attrs))
}

override fun generateLayoutParams(lp: ViewGroup.LayoutParams): RecyclerView.LayoutParams {
    return spanLayoutSize(super.generateLayoutParams(lp))
}

override fun checkLayoutParams(lp: RecyclerView.LayoutParams): Boolean {
    val layoutParams = generateDefaultLayoutParams()
    return super.checkLayoutParams(lp) &&
            layoutParams.width == lp.width &&
            layoutParams.height == lp.height
}

private fun spanLayoutSize(layoutParams: RecyclerView.LayoutParams): RecyclerView.LayoutParams {
    layoutParams.height = if (some_condition) x else y
    return layoutParams
}

这里x和y可以是您需要提供的像素高度。