Android对View进行截屏并将截屏保存至本地

         //获取当前屏幕的大小
        int width = getWindow().getDecorView().getRootView().getWidth();
        int height = getWindow().getDecorView().getRootView().getHeight();
        //生成相同大小的图片（用来存储截屏后生成的bitmap对象）
        Bitmap temBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        //找到当前页面的根布局（需要截屏的View）
        View view = qrCodeLL;
        //设置缓存
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();
        //从缓存中获取当前屏幕的图片
        temBitmap = view.getDrawingCache().copy(Bitmap.Config.ARGB_8888, false);
        //将截屏图片保存至本地
        saveToLocal(temBitmap);
        //销毁当前屏幕图片的缓存
        view.destroyDrawingCache();
        view.setDrawingCacheEnabled(false);

    /**
     * 保存截屏至本地
     *
     * @param bitmap
     */
    public void saveToLocal(Bitmap bitmap) {
        //生成路径
        String root = Environment.getExternalStorageDirectory().getAbsolutePath();
        String dirName = "screen";
        File appDir = new File(root, dirName);
        if (!appDir.exists()) {
            appDir.mkdirs();
        }
        //文件名为时间
        long timeStamp = System.currentTimeMillis();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd_HHmmss");
        String sd = sdf.format(new Date(timeStamp));
        String fileName = sd + ".jpg";

        //获取文件
        File file = new File(appDir, fileName);
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(file);
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
            //通知系统相册刷新
            InviteQRCodeActivity.this.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE,
                    Uri.fromFile(new File(file.getPath()))));
            Toast.makeText(InviteQRCodeActivity.this, getString(R.string.pic_to_local), Toast.LENGTH_SHORT).show();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (fos != null) {
                    fos.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }