Android View截屏长图拼接（RecyclerView）

Android页面View截图（分享、保存相册）

Android View 截屏上下拼接  

Android View截屏长图拼接（RecyclerView）

Android View截屏长图拼接（NestedScrollView）

RecyclerView截屏，其实就是遍历每个itemView，得到每个itemView的Bitmap，然后拼接成一个Bitmap。根据这个思路我们具体实现代码：

ublic static Bitmap bitmapByRecyclerView(RecyclerView recyclerView) {
        RecyclerView.Adapter adapter = recyclerView.getAdapter();
        Bitmap bigBitmap = null;
        if (adapter != null) {
            int size = adapter.getItemCount();
            int height = 0;
            Paint paint = new Paint();
            int iHeight = 0;
            final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);

            // Use 1/8th of the available memory for this memory cache.
            final int cacheSize = maxMemory / 8;
            LruCache bitmapCache = new LruCache<>(cacheSize);
            for (int i = 0; i < size; i++) {
                RecyclerView.ViewHolder holder = adapter.createViewHolder(recyclerView, adapter.getItemViewType(i));
                adapter.onBindViewHolder(holder, i);
                holder.itemView.measure(
                        View.MeasureSpec.makeMeasureSpec(recyclerView.getWidth(), View.MeasureSpec.EXACTLY),
                        View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
                holder.itemView.layout(0, 0, holder.itemView.getMeasuredWidth(),
                        holder.itemView.getMeasuredHeight());
                holder.itemView.setDrawingCacheEnabled(true);
                holder.itemView.buildDrawingCache();
                Bitmap drawingCache = holder.itemView.getDrawingCache();
                if (drawingCache == null){
                    drawingCache = Bitmap.createBitmap(holder.itemView.getWidth(), holder.itemView.getHeight(), Bitmap.Config.RGB_565);
                    Canvas itemCanvas = new Canvas(drawingCache);
                    holder.itemView.draw(itemCanvas);
                }
                if (drawingCache != null) {
                    bitmapCache.put(i, drawingCache);
                }
                height += holder.itemView.getMeasuredHeight();
            }

            bigBitmap = Bitmap.createBitmap(recyclerView.getMeasuredWidth(), height, Bitmap.Config.RGB_565);
            Canvas bigCanvas = new Canvas(bigBitmap);
            Drawable lBackground = recyclerView.getBackground();
            if (lBackground instanceof ColorDrawable) {
                ColorDrawable lColorDrawable = (ColorDrawable) lBackground;
                int lColor = lColorDrawable.getColor();
                bigCanvas.drawColor(lColor);
            }

            for (int i = 0; i < size; i++) {
                Bitmap bitmap = bitmapCache.get(i);
                if (bitmap != null){
                    bigCanvas.drawBitmap(bitmap, 0f, iHeight, paint);
                    iHeight += bitmap.getHeight();
                    bitmap.recycle();
                }

            }
        }
        return bigBitmap;
    }