Flutter：应用程序在加密时卡住

问题描述

我在加密和解密视频文件以及加密视频文件时遇到问题。没有任何错误。但在加密和解密视频文件时卡住了。我使用异步方法。但它仍然卡住。我的代码如下。

加密：

Future sifrele() async {
    try {
      crypt.setoverwriteMode(AesCryptOwMode.on);
      encFilepath = await crypt.encryptFile(realPath + '/WhatCarCanYouGetForAGrand.mp4',realPath + '/video.mp4.aes');
      print('The encryption has been completed successfully.');
    } on AesCryptException catch (e) {
      if (e.type == AesCryptExceptionType.destFileExists) {
        print('The encryption has been completed unsuccessfully.');
      }
      return;
    }
  }

解密：

Future decrypting() async {
    var videos = File(realPath + "/ElephantsDream.mp4.aes");
    try {
      realPath = await crypt.decryptFile(realPath + '/video.mp4.aes',realPath + '/cozulen.mp4');
      print('The decryption has been completed successfully.');
    } on AesCryptException catch (e) {
      if (e.type == AesCryptExceptionType.destFileExists) {
        print('The decryption has been completed unsuccessfully.');
      }
      return;
    }
  }

谢谢。

解决方法

为避免造成麻烦，您需要在后台执行类似这样的昂贵计算。在Android上，这意味着在另一个线程上安排工作。在Flutter中，您可以使用单独的Isolate和Compute。您可能应该需要这样的东西：

void _Startdecrypting(){
   compute(decrypting,/** If you need any input for your method put them here **/);
}



decrypting() {
    var videos = File(realPath + "/ElephantsDream.mp4.aes");
    try {
      realPath = crypt.decryptFile(realPath + '/video.mp4.aes',realPath + '/cozulen.mp4');
      print('The decryption has been completed successfully.');
    } on AesCryptException catch (e) {
      if (e.type == AesCryptExceptionType.destFileExists) {
        print('The decryption has been completed unsuccessfully.');
      }
      return;
    }
  }

对于其他用户来这里，关于同一主题的答案在这里Flutter: run multiple methods

crypt encryption