Flutter & Dart 安裝在window系統

1、系統環境

flutter最低要求

1，windows7 SP1 64位版本以上，個人系統就是windows 7 sp1 64bit

2，git for windows ，沒有安裝的須要到這裏下載 並安裝

3，powershell 5.0及以上，這個聽說只有windows10和2016版windows server知足要求

window7 sp1以及自帶Powershell，可是版本較低，個人系統中版本竟然是2.0

啓動：系統左下角-開始-點擊搜索框-輸入powershell-回車鍵
在powershell中輸入 $PSVersionTable 而後回車，查看其中的PSVersion一行


Windows PowerShell
版權全部 (C) 2009 Microsoft Corporation。保留全部權利。

PS C:\Users\gzg> $PSVersionTable

Name                           Value
----                           -----
CLRVersion                     2.0.50727.8793
BuildVersion                   6.1.7601.17514
PSVersion                      2.0
WSManStackVersion              2.0
PSCompatibleVersions           {1.0, 2.0}
SerializationVersion           1.1.0.1
PSRemotingProtocolVersion      2.1


PS C:\Users\gzg>

如何查看PowerShell版本

因爲PS沒有單獨的發行包，只能下載WMF5.1的發行包

下載後展開，包含以下兩個文件，右鍵點擊Install-WMF5.1.ps1，選擇用powershell運行安裝，過程不贅述。

4，安裝配置好android SDK，並創建一個模擬器

5，Android Studio，若是沒有請安裝http://www.androiddevtools.cn/。

2、下載安裝flutter sdk

1，進入預存放flutter目錄的父目錄中，從github克隆flutter beta版

git clone -b beta https://github.com/flutter/flutter.git

2，設置環境變量

1）將  *\flutter\bin目錄加入到環境變量path中

2）添加ANDROID_HOME環境變量，指向android SDK所在目錄

3， 設置國內鏡像代理，而後執行flutter doctor

打開dos窗口，設置國內鏡像

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

備註：或者也能夠直接添加系統變量，以備之後升級安裝方便。

4，進行下一步以前，首先關閉殺毒殺木馬程序，例如360之類，不然「flutter\bin\cache\artifacts\engine\android-arm64-release\windows-x64\gen_snapshot.exe」 會被認成木馬，形成運行失敗！

我這裏的報錯信息以下：

K:\Android\flutter>flutter doctor
Flutter assets will be downloaded from https://storage.flutter-io.cn. Make sure you trust this source!

Oops; flutter has exited unexpectedly.
Sending crash report to Google.

或者，給目錄「flutter\bin」添加到信任白名單。若是還有問題，看一看flutter目錄下的「flutter_##.log」文件查找緣由，而後在解決便可。

5，運行flutter設置命令

flutter doctor

flutter會檢測flutter SDK安裝狀況，而後下載dart SDK和其餘依賴項目，因爲網絡問題運行時間較長，期間難免發生失敗狀況，須要多運行幾回。

PS C:\Users\gzg> flutter doctor
Downloading android-arm-release/windows-x64 tools...
Download failed -- attempting retry 1 in 1 second...
Download failed -- attempting retry 2 in 2 seconds...
Download failed -- attempting retry 3 in 4 seconds...
Download failed -- attempting retry 4 in 8 seconds...
Download failed -- attempting retry 5 in 16 seconds...
Download failed -- attempting retry 6 in 32 seconds...
Download failed -- attempting retry 7 in 64 seconds...
Download failed -- attempting retry 8 in 64 seconds...
365.2s
Downloading android-arm64-profile/windows-x64 tools...           8.2s
Downloading android-arm64-release/windows-x64 tools...           7.6s
Downloading android-x86 tools...
Download failed -- attempting retry 1 in 1 second...
Download failed -- attempting retry 2 in 2 seconds...
142.8s
Downloading android-x64 tools...                                53.4s
Downloading android-arm tools...                                24.4s
Downloading android-arm-profile tools...

Oops; flutter has exited unexpectedly.
Sending crash report to Google.
Failed to send crash report due to a network error: SocketException: OS Error: 信号灯超时时间已到
, errno = 121, address = clients2.google.com, port = 60527
Crash report written to C:\Users\gzg\flutter_03.log;
please let us know at https://github.com/flutter/flutter/issues.
PS C:\Users\gzg> flutter doctor
Downloading android-arm-profile tools...
Download failed -- attempting retry 1 in 1 second...
Download failed -- attempting retry 2 in 2 seconds...
Download failed -- attempting retry 3 in 4 seconds...
Download failed -- attempting retry 4 in 8 seconds...
Download failed -- attempting retry 5 in 16 seconds...
Download failed -- attempting retry 6 in 32 seconds...
254.5s
Downloading android-arm-release tools...
Download failed -- attempting retry 1 in 1 second...
61.0s
Downloading android-arm64 tools...                              27.6s
Downloading android-arm64-profile tools...
Download failed -- attempting retry 1 in 1 second...
71.0s
Downloading android-arm64-release tools...
Download failed -- attempting retry 1 in 1 second...
Download failed -- attempting retry 2 in 2 seconds...
Download failed -- attempting retry 3 in 4 seconds...
Download failed -- attempting retry 4 in 8 seconds...
Download failed -- attempting retry 5 in 16 seconds...

6，最後，flutter doctor命令會給出環境檢測結果，若是有些項目有問題，則按照其中說明修正，例如，我這裏有兩項有問題：

Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel unknown, v0.0.0-unknown, on Microsoft Windows [Version 6.1.7601], locale zh-CN)
[!] Android toolchain - develop for Android devices (Android SDK 28.0.3)
    ! Some Android licenses not accepted.  To resolve this, run: flutter doctor --android-licenses
[√] Android Studio (version 3.2)
[√] IntelliJ IDEA Community Edition (version 2018.2)
[!] Connected device ! No devices available

! Doctor found issues in 2 categories.

 第二項問題依照藍色提示操做便可解決。最後一項虛擬機，創建一個虛擬機並啓動，再次運行檢測，沒問題了！

C:\Users\gzg>flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel unknown, v0.0.0-unknown, on Microsoft Windows [Version 6.1.7601], locale zh-CN)
[√] Android toolchain - develop for Android devices (Android SDK 28.0.3)
[√] Android Studio (version 3.2)
[√] IntelliJ IDEA Community Edition (version 2018.2)
[√] Connected device (1 available)

• No issues found!

3、開始flutter之旅

在android studio中創建flutter項目

菜單「File--New--New Flutter Project...」，第一步選擇「Flutter Application」，第二部輸入項目名稱，注意必定要選中下面的選項「create project offline」，不然在個人網絡環境下就進行不下去了。