转载于：https://www.cnblogs.com/Sharley/p/7942142.html

  private static File mPhotoFile = null;
    public static void setPhotoFile(File photoFile){
        mPhotoFile = photoFile;
    }

    public static File getPhotoFile(){

        return mPhotoFile;
    }


    /**
     * 保存图片到图库
     * @param bmp
     */
    public static void saveImageToGallery(Bitmap bmp,String bitName ) {
        // 首先保存图片
        File appDir = new File(Environment.getExternalStorageDirectory(),
                "yingtan");
        if (!appDir.exists()) {
            appDir.mkdir();
        }

        String fileName = bitName + ".jpg";
        File file = new File(appDir, fileName);

        try {
            FileOutputStream fos = new FileOutputStream(file);
            bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
            fos.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        setPhotoFile(file);
    }

    /**
     * @param bmp 获取的bitmap数据
     * @param picName 自定义的图片名
     */
    public static void saveBmp2Gallery(Context context,Bitmap bmp, String picName) {
        saveImageToGallery(bmp,picName);
        String fileName = null;
        //系统相册目录
        String galleryPath = Environment.getExternalStorageDirectory()
                + File.separator + Environment.DIRECTORY_DCIM
                + File.separator + "Camera" + File.separator;


        // 声明文件对象
        File file = null;
        // 声明输出流
        FileOutputStream outStream = null;
        try {
            // 如果有目标文件，直接获得文件对象，否则创建一个以filename为名称的文件
            file = new File(galleryPath, picName + ".jpg");
            // 获得文件相对路径
            fileName = file.toString();
            // 获得输出流，如果文件中有内容，追加内容
            outStream = new FileOutputStream(fileName);
            if (null != outStream) {
                bmp.compress(Bitmap.CompressFormat.JPEG, 90, outStream);
            }
        }catch (Exception e) {
            e.getStackTrace();
        } finally {
            try {
                if (outStream != null) {
                    outStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        MediaStore.Images.Media.insertImage(context.getContentResolver(),bmp,fileName,null);
        Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        Uri uri = Uri.fromFile(file);
        intent.setData(uri);
        context.sendBroadcast(intent);

        ToastUtils.showToast(context,"图片保存成功");

    }