ListView 截长图

ListView截长图： itemView太多可能会导致OOM。需要控制最多展示的条数

public Bitmap shotListView(ListView listview) {
        ListAdapter adapter = listview.getAdapter();
        int itemsCount = adapter.getCount();
        int allItemsHeight = 0;
        List<View> itemViews = new ArrayList<View>();
        for (int i = 0; i < itemsCount; i++) {
            View childView = adapter.getView(i, null, listview);
            childView.measure(
                    View.MeasureSpec.makeMeasureSpec(listview.getWidth(), View.MeasureSpec.EXACTLY),
                    View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
            childView.layout(0, 0, childView.getMeasuredWidth(), childView.getMeasuredHeight());
            itemViews.add(childView);
            allItemsHeight += childView.getMeasuredHeight();
        }
        Bitmap resultBitmap =
                Bitmap.createBitmap(listview.getMeasuredWidth(), allItemsHeight, Bitmap.Config.RGB_565);
        Canvas canvas = new Canvas(resultBitmap);
        for (View view : itemViews) {
            int width = listview.getWidth();
            view.measure(View.MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY), View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
            view.draw(canvas);
            canvas.translate(0, view.getMeasuredHeight());
        }
        return resultBitmap;
    }

RecyclerView的截长图类似于ListView:
itemView的获取如下：

 public static List<View> gerItemViews(RecyclerView recyclerView){
       final List<View> adapterViews = new ArrayList<>();
        if (recyclerView!=null) {
            RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
            int start = 0;
            if (layoutManager instanceof LinearLayoutManager) {
                start = ((LinearLayoutManager)layoutManager).findFirstVisibleItemPosition();
            }
            RecyclerView.Adapter adapter = recyclerView.getAdapter();
            if (adapter != null) {
                int len = adapter.getItemCount();
                int count = 5 < len ? 5 : len;
                for (int i = start; i < count + start; i++) {
                    RecyclerView.ViewHolder viewHolder = recyclerView.findViewHolderForAdapterPosition(i);
                    if (viewHolder != null) {
                        adapterViews.add(viewHolder.itemView);
                    }
                }
            }
        }
        return adapterViews;
    }

绘制时和listView基本一样：

for (View view : adapterViews) {
            int width = recyclerView.getWidth() - recyclerView.getPaddingLeft() - recyclerView.getPaddingRight();
            view.measure(View.MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY)
                    , View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
            view.draw(canvas);
            canvas.translate(0, view.getMeasuredHeight());
            SystemClock.sleep(100);
        }