Flutter:运行多种方法 [英] Flutter: run multiple methods

问题描述

我有一个大问题.如果我想加密我的视频文件，我的应用程序将冻结直到该方法完成.但是没有错误.我该如何编码我的应用程序不会冻结.谢谢.

I have a big problem. If I want to encrypt my video file, my application is freezing until that method finishing. But there is no error. How can I code my application does not freeze. thanks.

Future sifrele() async {
  String realPath =
    "/storage/emulated/0/Android/data/com.android.xxxx/files";

    var crypt = AesCrypt('sefa');
    try {
      crypt.setOverwriteMode(AesCryptOwMode.on);
      String encFilepaths = await crypt.encryptFile(
          realPath + '/WhatCarCanYouGetForAGrand.mp4',
          realPath + '/video.mp4.aes');
      print('The encryption has been completed successfully.');
      //print('Encrypted file: $encFilepath');

    } on AesCryptException catch (e) {
      if (e.type == AesCryptExceptionType.destFileExists) {
        print('The encryption has been completed unsuccessfully.');
      }
      return;
    }
  }

推荐答案

将函数的函数类型从Future更改为FutureOr，向函数添加参数(即使不需要) 并使用计算.它会完美地工作.

Change the function type of your function from Future to FutureOr, add a parameter to the function (even if you don't need it) and use compute. it will work perfectly.

之前

Future sifrele() async {

之后

FutureOr sifrele(String para) async {

计算

  doTheEncryption() {
    compute(sifrele, 'Pass the value of the parameter here if you need it');
  }

函数sifrele的另一重要定义必须是顶层，这意味着不在类内部，而应将其置于类外部. 函数 doTheEncryption()(或您所说的任何名称)也许在类内部都没有问题.

Another one important thing the definition of the function sifrele must be a top level, meaning not inside the class, put it outside the class. The function doTheEncryption() (or whaterver you name it) maybe inside the class no problem.

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