Android疑难杂症-自定义RecyclerView的LayoutManager

禁用RecyclerView手动滑动功能；

public class PlanDateRecyclerView extends RecyclerView {
    public PlanDateRecyclerView(Context context) {
        super(context);
        init();
    }
  
    public PlanDateRecyclerView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init();
    }
  
    public PlanDateRecyclerView(Context context, @Nullable AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }
  
    private void init() {
        setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                return true;
            }
        });
    }
}

示例

import android.content.Context;
import android.graphics.Rect;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
  
import java.util.List;
  
/**
 * Created by zhouzhuo810 on 2018/4/12.
 */
public class PlanCalendarLayoutManager extends RecyclerView.LayoutManager {
  
    private int totalWidth;
    private int totalHeight;
    private int verticalScrollOffset;
    private int horizontalScrollOffset;
  
    private List<PlanOrderEntity> frames;
    private int todayX;
  
    public PlanCalendarLayoutManager(Context ctx, List<PlanOrderEntity> frames, int todayX) {
        this.frames = frames;
        this.todayX = todayX;
    }
  
    @Override
    public RecyclerView.LayoutParams generateDefaultLayoutParams() {
        return new RecyclerView.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
    }
  
    @Override
    public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {
        if (getItemCount() <= 0 || state.isPreLayout()) {
            return;
        }
        detachAndScrapAttachedViews(recycler);
        fill(recycler, state);
    }
  
    private void fill(RecyclerView.Recycler recycler, RecyclerView.State state) {
        int itemCount = state.getItemCount();
        if (itemCount <= 0) {
            return;
        }
        if (frames != null) {
            int size = Math.min(getItemCount(), frames.size());
            for (int i = 0; i < size; i++) {
                Rect rect = frames.get(i).getRect();
                totalHeight = Math.max(rect.bottom, totalHeight);
                totalWidth = Math.max(rect.right, totalWidth);
                View viewForPosition = recycler.getViewForPosition(i);
                if (viewForPosition instanceof ViewGroup) {
                    ViewGroup.LayoutParams lp = viewForPosition.getLayoutParams();
                }
                addView(viewForPosition);
                measureChildWithMargins(viewForPosition, 0, 0);
                layoutDecoratedWithMargins(viewForPosition, rect.left, rect.top, rect.right, rect.bottom);
            }
            totalHeight = Math.max(totalHeight, getHeight());
            totalWidth = Math.max(totalWidth, getWidth());
        }
    }
  
    public int getTodayX() {
        return todayX - horizontalScrollOffset;
    }
  
    @Override
    public boolean canScrollVertically() {
        return true;
    }
  
    @Override
    public boolean canScrollHorizontally() {
        return true;
    }
  
    @Override
    public int scrollHorizontallyBy(int dx, RecyclerView.Recycler recycler, RecyclerView.State state) {
        int travelX = dx;
  
        //如果滑动到最左边
        if (horizontalScrollOffset + dx < 0) {
            travelX = -horizontalScrollOffset;
        }
        else if (horizontalScrollOffset + dx > totalWidth - getHorizontalSpace()) {//如果滑动到最右边
            travelX = totalWidth - getHorizontalSpace() - horizontalScrollOffset;
        }
  
        //将水平方向的偏移量+travel
        horizontalScrollOffset += travelX;
  
        // 调用该方法通知view在y方向上移动指定距离
        offsetChildrenHorizontal(-travelX);
  
        return travelX;
    }
  
    public void setTotalWidth(int totalWidth) {
        this.totalWidth = totalWidth;
    }
  
    @Override
    public int scrollVerticallyBy(int dy, RecyclerView.Recycler recycler, RecyclerView.State state) {
        //列表向下滚动dy为正，列表向上滚动dy为负，这点与Android坐标系保持一致。
        //实际要滑动的距离
        int travel = dy;
  
        //如果滑动到最顶部
        if (verticalScrollOffset + dy < 0) {
            travel = -verticalScrollOffset;
        } else if (verticalScrollOffset + dy > totalHeight - getVerticalSpace()) {//如果滑动到最底部
            travel = totalHeight - getVerticalSpace() - verticalScrollOffset;
        }
  
        //将竖直方向的偏移量+travel
        verticalScrollOffset += travel;
  
        // 调用该方法通知view在y方向上移动指定距离
        offsetChildrenVertical(-travel);
  
        return travel;
    }
  
    private int getVerticalSpace() {
        //计算RecyclerView的可用高度，除去上下Padding值
        return getHeight() - getPaddingBottom() - getPaddingTop();
    }
  
    public int getHorizontalSpace() {
        return getWidth() - getPaddingLeft() - getPaddingRight();
    }
  
    public int getTotalWidth() {
        return totalWidth;
    }
}

双RecyclerView滑动绑定功能实现

rv.addOnScrollListener(new RecyclerView.OnScrollListener() {
    @Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
        rvDate.scrollBy(dx, 0);
    }
});