RecyclerView 截屏

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/cjh_android/article/details/79361520

/** 
   * https://gist.github.com/PrashamTrivedi/809d2541776c8c141d9a 
   */  
  public static Bitmap shotRecyclerView(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);  
        }  
        height += holder.itemView.getMeasuredHeight();  
      }  

      bigBitmap = Bitmap.createBitmap(view.getMeasuredWidth(), height, Bitmap.Config.ARGB_8888);  
      Canvas bigCanvas = new Canvas(bigBitmap);  
      Drawable lBackground = view.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 = bitmaCache.get(String.valueOf(i));  
        bigCanvas.drawBitmap(bitmap, 0f, iHeight, paint);  
        iHeight += bitmap.getHeight();  
        bitmap.recycle();  
      }  
    }  
    return bigBitmap;  
  }  

经实测，如上代码确实可以，将 RecyclerView 完美的截屏下来。

---

NOTE

需要注意的是，如果你在该 RecyclerView 中页面有所改动，比如 RecyclerView 的条目中有 EditTextView，而对 EditTextView 是可以改动的，那么改动的数据，一定要刷新保存到到 Adapter 的数据中，否则你截屏所得到的不会是最新的展示，而是初始的展示。
原因：在以上代码中，对 RecyclerView 的 Adapter 重新进行了一次，创建视图和填充数据的过程，并将每一个视图拼接成一个完整的 RecyclerView 的视图。

 RecyclerView.ViewHolder holder = adapter.createViewHolder(view, adapter.getItemViewType(i));  
 adapter.onBindViewHolder(holder, i);  

在 onBindViewHolder 方法中，如果你没有保存最新的数据，那么绘制到界面上的自然就是老数据了。