Android项目中如何导入数据库

private void copyDB() { //data/data/packageName/databases/ File mkdir = new File(getFilesDir().getParent(),"databases"); //创建 databases文件夹 if (!mkdir.exists()) mkdir.mkdirs(); Log.e(TAG, "copyDb: mkdir="+mkdir.getPath()); //数据库文件 File file = new File(mkdir,"SinBusinessWssm1.db"); //只是在程序第一次启动时创建 if(!file.exists()){  //获取 assets管理  AssetManager assets = getAssets();  //执行文件复制  try {   InputStream open = assets.open("SinBusinessWssm1.db");   FileOutputStream fos = new FileOutputStream(file);   byte[] bs = new byte[1024];   int len ;   while ((len = open.read(bs))!=-1){    fos.write(bs,0,len);   }   fos.flush();   fos.close();   open.close();  } catch (IOException e) {   e.printStackTrace();  } } Log.e(TAG, "copyDb: exists="+file.getPath());}