Flutter第一个应用--踩坑之路

Flutter第一个应用--踩坑之路

安装

参照官网教程（这里)下载解压，以及设置环境变量便可。

若是你是中国用户（固然了，咱们都是），参考这篇文章Using Flutter in China,设置一下中国的镜像。

好比我用的是zsh,那个人设置以下：

export PUB_HOSTED_URL=https://pub.flutter-io.cn
export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn

而后使用flutter doctor检查一下环境，个人以下：

• 个人android studio是绿勾勾，是由于我已经安装过Flutter插件了
• 注意上图我红色箭头标注的地方，若是你的没有经过检查,按照doctor的提示输入命令flutter doctor --android-licenses,而后一路Y就行。

建立项目

安装官网的这篇文章使用AS建立项目，可是你会发现，卡在下面这个页面好久

google了好久，获得一个答案，很暴力。

1. 先打开项目文件夹，看是否已经成功建立了文件。（基本都是已经建立了的）
2. 而后强制杀死as
3. 而后从新启动as,打开已存在的项目
4. 可是，按照as的提示Get dependencies时，报Waiting for another flutter command to release the startup lock...错，解决办法是rm flutter/bin/cache/lockfile

编译项目

在编译项目的时候，你会发现，又卡住了，以下图所示：

广大网友们也踩过这些坑，google一通，无外乎以下：

1. 修改android/build.gradle下的仓库地址

   repositories {
   //        google()
   //        jcenter()
           maven { url 'https://maven.aliyun.com/repository/google' }
           maven { url 'https://maven.aliyun.com/repository/jcenter' }
           maven { url 'http://maven.aliyun.com/nexus/content/groups/public'}
   }
   
   allprojects {
       repositories {
   //        google()
   //        jcenter()
           maven { url 'https://maven.aliyun.com/repository/google' }
           maven { url 'https://maven.aliyun.com/repository/jcenter' }
           maven { url 'http://maven.aliyun.com/nexus/content/groups/public'}
       }
   }

2. 修改flutter安装目录下./packages/flutter_tools/gradle/flutter.gradle文件，也是改一下仓库地址

   buildscript {
       repositories {
           //google()
           //jcenter()
           maven { url 'https://maven.aliyun.com/repository/google' }
           maven { url 'https://maven.aliyun.com/repository/jcenter' }
           maven { url 'http://maven.aliyun.com/nexus/content/groups/public'}
       }
       dependencies {
           classpath 'com.android.tools.build:gradle:3.5.0'
       }
   }

   ---

   Gradle task 'assembleDebug' 结束后又报下面的错误

   * What went wrong:
   Execution failed for task ':flutter:javaPreCompileDebug'.
   > Could not resolve all files for configuration ':flutter:debugCompileClasspath'.
      > Could not find io.flutter:flutter_embedding_debug:1.0.0-5b952f286fc070e99cf192775fa5c9dfe858b692.
        Required by:
            project :flutter
      > Could not find io.flutter:arm64_v8a_debug:1.0.0-5b952f286fc070e99cf192775fa5c9dfe858b692.
        Required by:
            project :flutter
      > Could not find io.flutter:x86_debug:1.0.0-5b952f286fc070e99cf192775fa5c9dfe858b692.
        Required by:
            project :flutter
      > Could not find io.flutter:x86_64_debug:1.0.0-5b952f286fc070e99cf192775fa5c9dfe858b692.
        Required by:
            project :flutter

   我参考csdn这篇文章，修改了下图这几个文件：

   # 父路径是/opt/flutter/packages/flutter_tools/gradle
   aar_init_script.gradle
   flutter.gradle
   resolve_dependencies.gradle

将https://storage.googleapis.com/download.flutter.io换成http://download.flutter.io（也能够是https://storage.flutter-io.cn/download.flutter.io），修改内容以下图：

至此，终于编译成功了。

Performing hot reload... Syncing files to device Pixel 2... Reloaded 1 of 495 libraries in 584ms.