Android 生成分享长图并且添加全图水印

转载自 : http://blog.csdn.net/gengqiquan/article/details/65938021

领导最近觉得携程的截屏生成长图分享效果比较好，所以我们也加了个；产品觉得分享出去的长图需要加公司品牌水印，于是我们也加了个；嗯，事件起因就是这样。
长图一般是ScrollView和ListView。
我们需要取得这两个控件的完整显示的图片。原理很简单，搞一张和控件长宽一致的画布（就是创建一个高宽相等的bitmap）。然后调用控件的draw方法把自己画到画布上去。
分别贴出两个控件的长图获取方法

 /**
     * 截取scrollview的屏幕
     **/
    public static Bitmap getScrollViewBitmap(ScrollView scrollView) {
        int h = 0;
        Bitmap bitmap;
        for (int i = 0; i < scrollView.getChildCount(); i++) {
            h += scrollView.getChildAt(i).getHeight();
        }
        // 创建对应大小的bitmap

        bitmap = Bitmap.createBitmap(ScreenUtils.getScreenWidth(scrollView.getContext()), h,
                Bitmap.Config.ARGB_4444);
        final Canvas canvas = new Canvas(bitmap);
        canvas.drawColor(Color.parseColor("#f2f7fa"));
        scrollView.draw(canvas);
        return bitmap;
    }

 /**
     * 截图listview
     **/
    public static Bitmap getListViewBitmap(ListView listView, String picpath) {
        int h = 0;
        Bitmap bitmap;
        // 获取listView实际高度
        for (int i = 0; i < listView.getChildCount(); i++) {
            h += listView.getChildAt(i).getHeight();
        }
listView.getHeight());
        // 创建对应大小的bitmap
        bitmap = Bitmap.createBitmap(listView.getWidth(), h,
                Bitmap.Config.RGB_565);
        final Canvas canvas = new Canvas(bitmap);
        canvas.drawColor(Color.WHITE);
        listView.draw(canvas);
        // 测试输出
        FileOutputStream out = null;
        try {
            out = new FileOutputStream(picpath);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        try {
            if (null != out) {
                bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
                out.flush();
                out.close();
            }
        } catch (IOException e) {
        }
        return bitmap;
    }

奉送个获取具体view的显示图的方法

    /**
     * 生成某个view的图片
     *
     * @author gengqiquan
     * @date 2017/3/20 上午10:34
     */
    public static Bitmap getViewDrawingCacheBitmap(View view) {
        view = view.getRootView();
        if (!view.isDrawingCacheEnabled()) {
            view.setDrawingCacheEnabled(true);
        }
        view.destroyDrawingCache();
        view.buildDrawingCache();
        Bitmap bm = view.getDrawingCache();
        view.setDrawingCacheEnabled(false);
        return bm;
    }

再奉送个生成某个LinearLayout图片的方法

/**
     * 生成某个LinearLayout的图片
     *
     * @author gengqiquan
     * @date 2017/3/20 上午10:34
     */
    public static Bitmap getLinearLayoutBitmap(LinearLayout linearLayout) {
        int h = 0;
        // 获取LinearLayout实际高度
        for (int i = 0; i < linearLayout.getChildCount(); i++) {
            linearLayout.getChildAt(i).measure(0, 0);
            h += linearLayout.getChildAt(i).getMeasuredHeight();
        }
        linearLayout.measure(0, 0);
        // 创建对应大小的bitmap
        Bitmap bitmap = Bitmap.createBitmap(linearLayout.getMeasuredWidth(), h,
                Bitmap.Config.RGB_565);
        final Canvas canvas = new Canvas(bitmap);
        canvas.drawColor(Color.WHITE);
        linearLayout.draw(canvas);
        return bitmap;
    }

完了产品肯定会让你在下面或者上面加上公司的logo图片的，嗯。好人做到低，再送个拼接图片的方法

/**
*拼接图片
 * @param first 分享的长图
 * @param second  公司logo图
*@author gengqiquan
*@date 2017/3/25 下午4:56
*/
    public static Bitmap add2Bitmap(Bitmap first, Bitmap second) {
        float scale = ((float) first.getWidth()) / second.getWidth();
        second = ImageUtil.scaleImg(second, scale);
        int width = first.getWidth();
        int height = first.getHeight() + second.getHeight();
        Bitmap result = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_4444);
        Canvas canvas = new Canvas(result);
        canvas.drawBitmap(first, 0, 0, null);
        canvas.drawBitmap(second, 0, first.getHeight(), null);
        return result;
    }

再来个添加全图水印的方法

/**
     * @param first 原始图
     * @param mark  水印图
     * @author gengqiquan
     * @date 2017/3/25 下午4:58
     */
     public static Bitmap waterMark(Bitmap first, Bitmap mark) {
        float scale = ((float) first.getWidth()) / mark.getWidth();
        mark = ImageUtil.scaleImg(mark, scale);
        int height = first.getHeight();
        Canvas canvas = new Canvas(first);
        int h = 0;
        while (h < height + mark.getHeight()) {
            canvas.drawBitmap(mark, 0, h, null);
            h = h + mark.getHeight();
        }
        return first;
    }

另：

http://www.cnblogs.com/meieiem/archive/2012/08/15/2639543.html   android 实现图片加水印