public class FileUtils {
 public static void savePhoto(final Context context, final String url , final SaveResultCallback saveResultCallback) {
 new Thread(new Runnable() {


  @Override
  public void run() {
  File appDir = new File(Environment.getExternalStorageDirectory(), "out_photo");
  if (!appDir.exists()) {
   appDir.mkdir();
  }
  SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");//设置以当前时间格式为图片名称
  String fileName = df.format(new Date()) + ".jpg";
  File file = new File(appDir, fileName);
  if (url.endsWith(".svg")){
   //拿到图片在assets目录下的相对路径
   String replaceUrl = url.replace("file:///android_asset/", "");
   try {
   SVG svg = new SVGBuilder().readFromAsset(context.getAssets(), replaceUrl).build();
   //拿到svg图片的drawable
   PictureDrawable drawable = svg.getDrawable();
   //图片背景的画笔
   Paint paint = new Paint();
   paint.setColor(Color.WHITE);
   //图片线条的画笔
   Paint paint1 = new Paint();
   paint1.setColor(Color.BLACK);
   //创建bitmap对象
   Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
   Canvas canvas = new Canvas(bitmap);
   canvas.drawRect(0,0,bitmap.getWidth()+50,bitmap.getHeight()+50,paint);
   drawable.setBounds(0,0,canvas.getWidth(),canvas.getHeight());
   drawable.draw(canvas);
   FileOutputStream fos = new FileOutputStream(file);
   //转为jpg格式并写入到sd卡
   bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
   fos.flush();
   fos.close();
   saveResultCallback.onSavedSuccess();
   } catch (IOException e) {
   e.printStackTrace();
   saveResultCallback.onSavedFailed();
   }
  }else {
  try {
   //保存jpg格式的图片到相册中
   FileOutputStream fos = new FileOutputStream(file);
   InputStream fis = context.getAssets().open(url.replace("file:///android_asset/",""));
   int len = 0;
   byte[] bytes = new byte[1024];
   while ((len = fis.read(bytes)) != -1){
   fos.write(bytes,0,len);
   }
   fos.flush();
   fis.close();
   fos.close();
   saveResultCallback.onSavedSuccess();
  } catch (FileNotFoundException e) {
   saveResultCallback.onSavedFailed();
   e.printStackTrace();
  } catch (IOException e) {
   saveResultCallback.onSavedFailed();
   e.printStackTrace();
  }
  }

  //保存图片后发送广播通知更新数据库
  Uri uri = Uri.fromFile(file);
  context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, uri));
  }
 }).start();
 }

 public interface SaveResultCallback{
 void onSavedSuccess();
 void onSavedFailed();
 }

}