android 以截图RecyclerView在全长

fiei3ece  于 2023-04-28  发布在  Android
关注(0)|答案(6)|浏览(135)

我想获得活动的“全页”屏幕截图。视图包含一个包含许多项目的RecyclerView。
我可以用这个函数对当前视图进行截图：

public Bitmap getScreenBitmap() {
    View v= findViewById(R.id.container).getRootView();
    v.setDrawingCacheEnabled(true);
    v.buildDrawingCache(true);
    Bitmap b = Bitmap.createBitmap(v.getDrawingCache());
    v.setDrawingCacheEnabled(false); // clear drawing cache
    return b;
}

但它只包含我可以正常查看的项目（如预期的那样）。

截图时，有没有什么方法可以让RecyclerView神奇地显示完整长度（一次显示所有项目）？

如果没有，我应该如何处理这个问题？

android

6条答案

按热度按时间
ux6nzvsh

ux6nzvsh1#

这段代码适用于recyclerview项目类型，可能与其大小无关。
它是用一个具有线性布局管理器和三种项目类型的recyclerview测试的。还需要用其他布局管理器来检查它。

public Bitmap getScreenshotFromRecyclerView(RecyclerView view) {
        RecyclerView.Adapter adapter = view.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<String, Bitmap> bitmaCache = new LruCache<>(cacheSize);
            for (int i = 0; i < size; i++) {
                RecyclerView.ViewHolder holder = adapter.createViewHolder(view, adapter.getItemViewType(i));
                adapter.onBindViewHolder(holder, i);
                holder.itemView.measure(View.MeasureSpec.makeMeasureSpec(view.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) {

                    bitmaCache.put(String.valueOf(i), drawingCache);
                }
//                holder.itemView.setDrawingCacheEnabled(false);
//                holder.itemView.destroyDrawingCache();
                height += holder.itemView.getMeasuredHeight();
            }

            bigBitmap = Bitmap.createBitmap(view.getMeasuredWidth(), height, Bitmap.Config.ARGB_8888);
            Canvas bigCanvas = new Canvas(bigBitmap);
            bigCanvas.drawColor(Color.WHITE);

            for (int i = 0; i < size; i++) {
                Bitmap bitmap = bitmaCache.get(String.valueOf(i));
                bigCanvas.drawBitmap(bitmap, 0f, iHeight, paint);
                iHeight += bitmap.getHeight();
                bitmap.recycle();
            }

        }
        return bigBitmap;
    }
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up9lanfz

up9lanfz2#

下面是我对LinearLayoutManager的解决方案，当所有项目都是相同大小并且只有一种类型的项目时。此解决方案基于This answer。

注意：可能导致内存不足错误。

public static Bitmap getRecyclerViewScreenshot(RecyclerView view) {
        int size = view.getAdapter().getItemCount();
        RecyclerView.ViewHolder holder = view.getAdapter().createViewHolder(view, 0);
        view.getAdapter().onBindViewHolder(holder, 0);
        holder.itemView.measure(View.MeasureSpec.makeMeasureSpec(view.getWidth(), View.MeasureSpec.EXACTLY),
                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
        holder.itemView.layout(0, 0, holder.itemView.getMeasuredWidth(), holder.itemView.getMeasuredHeight());
        Bitmap bigBitmap = Bitmap.createBitmap(view.getMeasuredWidth(), holder.itemView.getMeasuredHeight() * size,
                Bitmap.Config.ARGB_8888);
        Canvas bigCanvas = new Canvas(bigBitmap);
        bigCanvas.drawColor(Color.WHITE);
        Paint paint = new Paint();
        int iHeight = 0;
        holder.itemView.setDrawingCacheEnabled(true);
        holder.itemView.buildDrawingCache();
        bigCanvas.drawBitmap(holder.itemView.getDrawingCache(), 0f, iHeight, paint);
        holder.itemView.setDrawingCacheEnabled(false);
        holder.itemView.destroyDrawingCache();
        iHeight += holder.itemView.getMeasuredHeight();
        for (int i = 1; i < size; i++) {
            view.getAdapter().onBindViewHolder(holder, i);
            holder.itemView.setDrawingCacheEnabled(true);
            holder.itemView.buildDrawingCache();
            bigCanvas.drawBitmap(holder.itemView.getDrawingCache(), 0f, iHeight, paint);
            iHeight += holder.itemView.getMeasuredHeight();
            holder.itemView.setDrawingCacheEnabled(false);
            holder.itemView.destroyDrawingCache();
        }
        return bigBitmap;
    }

**注2：**最初是用Kotlin编写的，Here是我使用的原始代码。

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jmo0nnb3

jmo0nnb33#

拍摄完整Recyclerview的屏幕截图，无论其项目和项目类型如何：
这段代码的工作原理就像一个魅力。
这里有一个简单的方法来做到这一点，简短而准确：

recyclerView.measure(
        View.MeasureSpec.makeMeasureSpec(recyclerView.getWidth(), View.MeasureSpec.EXACTLY),
        View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));

Bitmap bm = Bitmap.createBitmap(recyclerView.getWidth(), recyclerView.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
recyclerView.draw(new Canvas(bm));

saveImage(bm);
ImageView im
          = new ImageView(getActivity());
im.setImageBitmap(bm);
 new AlertDialog.Builder(getActivity()).setView(im).show();
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8xiog9wr

8xiog9wr4#

我找到的最佳解决方案是

1.创建新的NestedScrollView
1.将其添加到recyclerview的父级
1.删除recyclerview从其父“重要的是要添加到一个新的父”
1.添加recyclerview到nestedscrollview
1.截图nestedscrollview
1.将recyclerview添加到其父节点。

nestedScreenShot = new NestedScrollView(getContext());

 constraintLayout.removeView(recyclerView);

 ConstraintLayout.LayoutParams params =new 

 Constraints.LayoutParams(viewGroup.LayoutParams.MATCH_PARENT,

 ViewGroup.LayoutParams.MATCH_PARENT);

 nestedScreenShot.setLayoutParams(params);

Drawable scrollBackground = scrollView.getBackground();
if (scrollBackground != null) {
    tempNestedScreenShot.setBackground(scrollBackground);
}
tempNestedScreenShot.setPadding(scrollView.getLeft(), 
scrollView.getTop(), scrollView.getRight(), scrollView.getBottom());

 constraintLayout.addView(nestedScreenShot);

 nestedScreenShot.addView(recyclerView, params);

 new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {

            nestedScreenShot.removeView(recyclerView);
            constraintLayout.removeView(nestedScreenShot);
            nestedScreenShot = null;
            constraintLayout.addView(recyclerView, params);

        }
        }, 8000);
  takescreenshotOfNested(nestedScreenShot);

此方法将返回nestedscrollview的屏幕截图

private Bitmap takescreenshotOfNested(View u) {
        
        NestedScrollView viewNested = null;
            
        ScrollView viewScroll = null;
              
        if (u instanceof NestedScrollView) {
                 
       
        viewNested = (NestedScrollView) u;
             
     
       } else if (u instanceof ScrollView) {
              
      
         viewScroll = (ScrollView) u;
            
       }
            
                Bitmap bitmap;
                if (viewNested != null) {
                    viewNested.setDrawingCacheEnabled(false);
                    viewNested.invalidate();
                    viewNested.getChildAt(0).setDrawingCacheEnabled(false);
                    viewNested.getChildAt(0).invalidate();
            
                    bitmap = Bitmap.createBitmap(viewNested.getChildAt(0).getWidth(),
                            viewNested.getChildAt(0).getHeight() + 8, Bitmap.Config.ARGB_8888);
                    Canvas canvas = new Canvas(bitmap);
                    canvas.drawColor(activity.getResources().getColor(R.color.layout_background));
                    viewNested.draw(canvas);
                } else {
            
                    try {
            
                        viewScroll.setDrawingCacheEnabled(false);
                        viewScroll.invalidate();
                    } catch (Exception ignored) {
                    }
                    viewScroll.getChildAt(0).setDrawingCacheEnabled(false);
                    viewScroll.getChildAt(0).invalidate();
            
                    bitmap = Bitmap.createBitmap(viewScroll.getChildAt(0).getWidth(),
                            viewScroll.getChildAt(0).getHeight() + 8, Bitmap.Config.ARGB_8888);
                    Canvas canvas = new Canvas(bitmap);
                    canvas.drawColor(activity.getResources().getColor(R.color.layout_background));
                    viewScroll.draw(canvas);
            
                }
                return bitmap;
            
            }

使用完位图后别忘了回收它

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zf2sa74q

zf2sa74q5#

我写了一个方法来获得几个不同视图的截图：

private static Bitmap getBitmapFromView(View view) {
    if (view.getVisibility() != View.VISIBLE) {
        view = getNextView(view);
        Log.d(TAG, "New view id: " + view.getId());
    }
    //Define a bitmap with the same size as the view
    Bitmap returnedBitmap;
    if (view instanceof ScrollView) {
        returnedBitmap = Bitmap.createBitmap(((ViewGroup) view).getChildAt(0).getWidth(), ((ViewGroup) view).getChildAt(0).getHeight(), Bitmap.Config.ARGB_8888);
    } else if (view instanceof RecyclerView) {
        view.measure(
                View.MeasureSpec.makeMeasureSpec(view.getWidth(), View.MeasureSpec.EXACTLY),
                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));

        returnedBitmap = Bitmap.createBitmap(view.getWidth(), view.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
    } else {
        returnedBitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
    }

    //Bind a canvas to it
    Canvas canvas = new Canvas(returnedBitmap);
    //Get the view's background
    Drawable bgDrawable = view.getBackground();
    if (bgDrawable != null) {
        //has background drawable, then draw it on the canvas
        bgDrawable.draw(canvas);
    } else {
        //does not have background drawable, then draw white background on the canvas
        canvas.drawColor(Color.WHITE);
    }
    // draw the view on the canvas
    view.draw(canvas);
    //return the bitmap
    return returnedBitmap;
}

/**
 * If the base view is not visible, then it has no width or height.
 * This causes a problem when we are creating a PDF based on its size.
 * This method gets the next visible View.
 *
 * @param view The invisible view
 * @return The next visible view after the given View, or the original view if there's no more
 * visible views.
 */
private static View getNextView(View view) {
    if (view.getParent() != null && (view.getParent() instanceof ViewGroup)) {
        ViewGroup group = (ViewGroup) view.getParent();
        View child;
        boolean getNext = false;
        //Iterate through all views from parent
        for (int i = 0; i < group.getChildCount(); i++) {
            child = group.getChildAt(i);
            if (getNext) {
                //Make sure the view is visible, else iterate again until we find a visible view
                if (child.getVisibility() == View.VISIBLE) {
                    Log.d(TAG, String.format(Locale.ENGLISH, "CHILD: %s : %s", child.getClass().getSimpleName(), child.getId()));
                    view = child;
                }
            }
            //Iterate until we find out current view,
            // then we want to get the NEXT view
            if (child.getId() == view.getId()) {
                getNext = true;
            }
        }
    }
    return view;
}
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6ioyuze2

6ioyuze26#

灵感来自Nouman Ch回答，该解决方案工作得很好，但我在最终图像中面临背景颜色问题，并且在此之后recyclerView滚动也无法正常工作。这里是快速修复！
从recyclerView创建位图后

presenter?.dataRecyclerView?.let {
            it.measure(
                View.MeasureSpec.makeMeasureSpec(it.width, View.MeasureSpec.EXACTLY),
                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED)
            );

            var bm = Bitmap.createBitmap(
                it.width,
                it.measuredHeight,
                Bitmap.Config.ARGB_8888
            )
            it.draw(Canvas(bm))

//to fix background color of final image
            val newBitmap = Bitmap.createBitmap(bm.width, bm.height, bm.config)
            val canvas = Canvas(newBitmap)
            canvas.drawColor(Color.WHITE)
            canvas.drawBitmap(bm, 0f, 0f, null)
            bm = newBitmap

            saveBitmapeToGallery(bm)
//notify adapter, to fix scrolling
            it.adapter?.notifyDataSetChanged()
        }
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