Android 将View视图生成Bitmap

例如:将NestedScrollView视图（继承ViewGroup类）生成Bitmap

private Bitmap getBitmapByView(NestedScrollView scrollView) {
        int h = 0;
        Bitmap bitmap = null;
        // 获取scrollview实际高度
        for (int i = 0; i < scrollView.getChildCount(); i++) {
            h += scrollView.getChildAt(i).getHeight();//获取scrollView的屏幕高度
            scrollView.getChildAt(i).setBackgroundColor(
                    Color.parseColor("#ffffff"));
        }
        // 创建对应大小的bitmap
        bitmap = Bitmap.createBitmap(scrollView.getWidth(), h,
                Bitmap.Config.RGB_565);
        final Canvas canvas = new Canvas(bitmap);//把创建的bitmap放到画布中去
        scrollView.draw(canvas);//绘制canvas 画布
        return bitmap;
    }
           

保存图片

public void savePicture(Bitmap bm, String fileName) {
        LogUtils.d("正在生成文件.........");
        String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/inform";
        File file = new File(path);
        if (FileUtils.isFileExists(file)) {
            FileUtils.delete(file);
            file.mkdirs();
        } else {
            // 创建文件夹
            file.mkdirs();
        }

        File myCaptureFile = new File(path + "/" + fileName);
        LogUtils.d("myCaptureFile", myCaptureFile.getAbsoluteFile());
        if (FileUtils.isFileExists(myCaptureFile)) {
            // 删除已存在的文件 
            FileUtils.delete(myCaptureFile);
        }
        try {
            myCaptureFile.createNewFile();
            //重新创建文件
            LogUtils.d("CaptureFileName", myCaptureFile.getAbsoluteFile());
            BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(myCaptureFile));
            //压缩保存到本地
            bm.compress(Bitmap.CompressFormat.JPEG, 95, bos);
            bos.flush();
            bos.close();
            // -------------  获取图片的宽高 -----------------
            int[] wh = ImageUtils.getSize(myCaptureFile);
            LogUtils.d("宽:" + wh[0], "高:" + wh[1]);
//            Toast.makeText(this, "保存成功!", Toast.LENGTH_SHORT).show();
            LogUtils.d("保存成功");
        } catch (Exception e) {
            LogUtils.e(e);
            Toast.makeText(this, "保存失败!", Toast.LENGTH_SHORT).show();
        }
    }