View生成Bitmap截图 方法收集

View截图

    /**
     * 该方式原理主要是：View组件显示的内容可以通过cache机制保存为bitmap
     */
    public static Bitmap createBitmapFromView(View view) {
        Bitmap bitmap = null;
        //开启view缓存bitmap
        view.setDrawingCacheEnabled(true);
        //设置view缓存Bitmap质量
        view.setDrawingCacheQuality(DRAWING_CACHE_QUALITY_HIGH);
        //获取缓存的bitmap
        Bitmap cache = view.getDrawingCache();
        if (cache != null && !cache.isRecycled()) {
            bitmap = Bitmap.createBitmap(cache);
        }
        //销毁view缓存bitmap
        view.destroyDrawingCache();
        //关闭view缓存bitmap
        view.setDrawingCacheEnabled(false);
        return bitmap;
    }

recycleview截图

    /**
     * recycleview截图
     * @param view
     * @return
     */
    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;
            int density = 0;
            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()+ SizeUtils.dp2px(20));
                holder.itemView.setDrawingCacheEnabled(true);
                holder.itemView.buildDrawingCache();
                Bitmap drawingCache = holder.itemView.getDrawingCache();
                if (drawingCache != null) {
                    bitmaCache.put(String.valueOf(i), drawingCache);
                    density = drawingCache.getDensity();
                }
                height += holder.itemView.getMeasuredHeight();
            }

            bigBitmap = Bitmap.createBitmap(view.getMeasuredWidth(), height, Bitmap.Config.ARGB_8888);
            bigBitmap.setDensity(density);
            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()+ SizeUtils.dp2px(20);
                bitmap.recycle();
            }
        }
        return bigBitmap;
    }

Bitmap拼接

    /**
     * 将bitmap集合上下拼接,纵向(多个)
     * @param bgColor #4088F0
     * @param bitmaps
     * @return
     */
    public static Bitmap drawMultiV(String bgColor, ArrayList<Bitmap> bitmaps) {
        if(null==bitmaps){
            return null;
        }
        int width = bitmaps.get(0).getWidth();
        int height = bitmaps.get(0).getHeight();
        int density = bitmaps.get(0).getDensity();
        for (int i = 1;i<bitmaps.size();i++) {
            if (width < bitmaps.get(i).getWidth()) {
                width = bitmaps.get(i).getWidth();
            }
            height = height+bitmaps.get(i).getHeight();
        }
        Bitmap result = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        result.setDensity(density);
        Canvas canvas = new Canvas(result);
        if (bgColor!=null && !bgColor.isEmpty())
            canvas.drawColor(Color.parseColor(bgColor));
        Paint paint = new Paint();
        paint.setDither(true);
        canvas.drawBitmap(bitmaps.get(0), 0, 0, paint);
        int h = 0;
        for (int j = 1;j<bitmaps.size();j++) {
            h = bitmaps.get(j).getHeight()+h;
            canvas.drawBitmap(bitmaps.get(j), 0,h, paint);
        }
        return result;
    }

    /**
     * 将bitmap集合上下拼接,横向(多个)
     * @param bgColor #4088F0
     * @param bitmaps
     * @return
     */
    public static Bitmap drawMultiH(String bgColor,ArrayList<Bitmap> bitmaps) {
        if(null==bitmaps){
            return null;
        }
        int width = bitmaps.get(0).getWidth();
        int height = bitmaps.get(0).getHeight();
        int density = bitmaps.get(0).getDensity();
        for (int i = 1;i<bitmaps.size();i++) {
            if (height < bitmaps.get(i).getHeight()) {
                height = bitmaps.get(i).getHeight();
            }
            width = width+bitmaps.get(i).getWidth();
        }
        Bitmap result = Bitmap.createBitmap(width, height,Bitmap.Config.ARGB_8888);
        result.setDensity(density);
        Canvas canvas = new Canvas(result);
        if (bgColor!=null && !bgColor.isEmpty())
            canvas.drawColor(Color.parseColor(bgColor));
        Paint paint = new Paint();
        paint.setDither(true);
        canvas.drawBitmap(bitmaps.get(0), 0, 0, paint);
        int w = 0;
        for (int j = 1;j<bitmaps.size();j++) {
            w = bitmaps.get(j).getWidth()+w;
            canvas.drawBitmap(bitmaps.get(j), w,0, paint);
        }
        return result;
    }