Flutter 学习之打包 - 纯Flutter项目生成Android包 - android

###前言

前面介绍了Flutter中一些基本Widget的使用方法，下面我们来先下实战中是如何构建生成Android包的，本文我们主要介绍纯Flutter项目生成Android包的方法，以及遇到的问题
###正文

1、生成签名文件
这个步骤对于一个Android开发来说应该是很简单的，这里我就不进行赘述，需要的小伙伴可以参考Android的签名文件生成两种方法
2、配置gradle文件
在/android/目录下创建一个key.properties的文件，包含我们所需要一些内容，例如

storePassword="你签名设置的密码"keyPassword="你签名设置的密码"keyAlias="你签名的别名"storeFile="你的签名文件存放的路径"

在android/app/build.gradle文件中添加下面的信息

def keystorePropertiesFile = rootProject.file("key.properties")def keystoreProperties = new Properties()if (keystorePropertiesFile.exists()){    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))}android{  ...signingConfigs {           release {            keyAlias keystoreProperties['keyAlias']            keyPassword keystoreProperties['keyPassword']            storeFile file(keystoreProperties['storeFile'])            storePassword keystoreProperties['storePassword']        }    }buildTypes {        release {            signingConfig signingConfigs.release        }    }}

3、配置混淆
在/android/app/目录下创建proguard-rules.pro文件，并添加内容

#Flutter Wrapper-keep class io.flutter.app.** { *; }-keep class io.flutter.plugin.**  { *; }-keep class io.flutter.util.**  { *; }-keep class io.flutter.view.**  { *; }-keep class io.flutter.**  { *; }-keep class io.flutter.plugins.**  { *; }

PS：之后需要混淆的库都添加在这个文件中

然后在android/app/build.gradle文件中添加下面的信息

android {    ...    buildTypes {        release {            signingConfig signingConfigs.release  //使用正式release配置            minifyEnabled true //是否压缩            useProguard true //打开混淆            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' //配置混淆文件        }    }}

此时关于打包的前期配置就结束了，下面开始执行命令进行打包

cd到工程目录下
flutter build apk
顺利的话我们会看到如下内容

tianchibindeMacBook-Pro:flutter_build_apk tiancb$ flutter build apkYou are building a fat APK that includes binaries for android-arm, android-arm64, android-x64.If you are deploying the app to the Play Store, it's recommended to use app bundles or split the APK to reduce the APK size.    To generate an app bundle, run:        flutter build appbundle --target-platform android-arm,android-arm64,android-x64        Learn more on: https://developer.android.com/guide/app-bundle    To split the APKs per ABI, run:        flutter build apk --target-platform android-arm,android-arm64,android-x64 --split-per-abi        Learn more on:  https://developer.android.com/studio/build/configure-apk-splits#configure-abi-split[!] Your app isn't using AndroidX.    To avoid potential build failures, you can quickly migrate your app by following the steps on https://goo.gl/CP92wY.Removed unused resources: Binary resource data reduced from 44KB to 35KB: Removed 20%Running Gradle task 'assembleRelease'...                                Running Gradle task 'assembleRelease'... Done                      47.0s✓ Built build/app/outputs/apk/release/app-release.apk (15.3MB).

最后的build/app/outputs/apk/release/app-release.apk这是apk包的路径。
上面我们说到，顺利的话会直接生成apk包，现在我们来看下打包的过程中遇到的问题

Q1：ProcessException: Bad CPU type in executable
完整的日志是

ProcessException: Bad CPU type in executable                              Command: /Users/tiancb/Desktop/Android/flutter/bin/cache/artifacts/engine/android-arm-release/darwin-x64/gen_snapshot --causal_async_stacks --deterministic --snapshot_kind=app-aot-elf --elf=/Users/tiancb/Desktop/Flutter/flutter_build_apk/build/app/intermediates/flutter/release/android-arm/app.so --strip --no-sim-use-hardfp --no-use-integer-division /Users/tiancb/Desktop/Flutter/flutter_build_apk/build/app/intermediates/flutter/release/android-arm/app.dill#0      runCommandAndStreamOutput (package:flutter_tools/src/base/process.dart:142:27)                                               #1      GenSnapshot.run (package:flutter_tools/src/base/build.dart:75:12)#2      AOTSnapshotter.build. (package:flutter_tools/src/base/build.dart:211:27)#3      AOTSnapshotter._timedStep (package:flutter_tools/src/base/build.dart:344:33)                                               #4      AOTSnapshotter.build (package:flutter_tools/src/base/build.dart:210:13)                                               #5      BuildAotCommand.runCommand (package:flutter_tools/src/commands/build_aot.dart:149:56)                                               #6      FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:478:18)                                               #7      FlutterCommand.run. (package:flutter_tools/src/runner/flutter_command.dart:383:33)                                               #8      AppContext.run. (package:flutter_tools/src/base/context.dart:153:29)                                               #9      _rootRun (dart:async/zone.dart:1124:13)                         #10     _CustomZone.run (dart:async/zone.dart:1021:19)                  #11     _runZoned (dart:async/zone.dart:1516:10)                        #12     runZoned (dart:async/zone.dart:1463:12)                         #13     AppContext.run (package:flutter_tools/src/base/context.dart:152:18)                                               #14     FlutterCommand.run (package:flutter_tools/src/runner/flutter_command.dart:375:20)#15     CommandRunner.runCommand (package:args/command_runner.dart:197:27)                                               #16     FlutterCommandRunner.runCommand. (package:flutter_tools/src/runner/flutter_command_runner.dart:396:21)                                               #17     AppContext.run. (package:flutter_tools/src/base/context.dart:153:29)                                               #18     _rootRun (dart:async/zone.dart:1124:13)                         #19     _CustomZone.run (dart:async/zone.dart:1021:19)                  #20     _runZoned (dart:async/zone.dart:1516:10)                        #21     runZoned (dart:async/zone.dart:1463:12)                         #22     AppContext.run (package:flutter_tools/src/base/context.dart:152:18)                                               #23     FlutterCommandRunner.runCommand (package:flutter_tools/src/runner/flutter_command_runner.dart:356:19)                                               #24     CommandRunner.run. (package:args/command_runner.dart:112:25)#25     new Future.sync (dart:async/future.dart:224:31)                 #26     CommandRunner.run (package:args/command_runner.dart:112:14)     #27     FlutterCommandRunner.run (package:flutter_tools/src/runner/flutter_command_runner.dart:242:18)#28     run.. (package:flutter_tools/runner.dart:62:22)                                               #29     _rootRun (dart:async/zone.dart:1124:13)                         #30     _CustomZone.run (dart:async/zone.dart:1021:19)                  #31     _runZoned (dart:async/zone.dart:1516:10)                        #32     runZoned (dart:async/zone.dart:1500:12)                         #33     run. (package:flutter_tools/runner.dart:60:18)                                               #34     AppContext.run. (package:flutter_tools/src/base/context.dart:153:29)                                               #35     _rootRun (dart:async/zone.dart:1124:13)                         #36     _CustomZone.run (dart:async/zone.dart:1021:19)                  #37     _runZoned (dart:async/zone.dart:1516:10)                        #38     runZoned (dart:async/zone.dart:1463:12)                         #39     AppContext.run (package:flutter_tools/src/base/context.dart:152:18)                                               #40     runInContext (package:flutter_tools/src/context_runner.dart:56:24)                                               #41     run (package:flutter_tools/runner.dart:51:10)                   #42     main (package:flutter_tools/executable.dart:62:9)                                                              #43     main (file:///Users/tiancb/Desktop/Android/flutter/packages/flutter_tools/bin/flutter_tools.dart:8:3)#44     _startIsolate. (dart:isolate-patch/isolate_patch.dart:299:32)#45     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:172:12)                                                                                                                                                FAILURE: Build failed with an exception.                                                                                                        * Where:                                                                Script '/Users/tiancb/Desktop/Android/flutter/packages/flutter_tools/gradle/flutter.gradle' line: 638                                                                        * What went wrong:                                                      Execution failed for task ':app:compileflutterBuildReleaseArm'.         > Process 'command '/Users/tiancb/Desktop/Android/flutter/bin/flutter'' finished with non-zero exit value 1                                                                        * Try:                                                                  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

解决方法-执行下面的

flutter doctor --android-licenses

执行完之后会有一个

Accept? (y/N):

直接选择y就行了

Q2 - Could not download …
完整的错误日志是

Could not resolve all files for configuration ':app:releaseCompileClasspath'.                                      > Could not download armeabi_v7a_release.jar (io.flutter:armeabi_v7a_release:1.0.0-af04338413c3ed73316350f64248a152433073b6)   > Could not get resource 'http://download.flutter.io/io/flutter/armeabi_v7a_release/1.0.0-af04338413c3ed73316350f64248a152433073b6/armeabi_v7a_release-1.0.0-af04338413c3ed73316350f64248a152433073b6.jar'.      > Could not HEAD 'http://download.flutter.io/io/flutter/armeabi_v7a_release/1.0.0-af04338413c3ed73316350f64248a152433073b6/armeabi_v7a_release-1.0.0-af04338413c3ed73316350f64248a152433073b6.jar'.         > Connect to download.flutter.io:80 [download.flutter.io/172.217.160.80, download.flutter.io/2404:6800:4012:0:0:0:0:2010] failed: No route to host (connect failed)                                                                                                                   * Try:                                                                                                             Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* What went wrong:                                                                                                 Execution failed for task ':app:lintVitalRelease'.                                                                 > Could not resolve all artifacts for configuration ':app:profileRuntimeClasspath'.                                   > Could not download arm64_v8a_profile.jar (io.flutter:arm64_v8a_profile:1.0.0-af04338413c3ed73316350f64248a152433073b6)      > Could not get resource 'http://download.flutter.io/io/flutter/arm64_v8a_profile/1.0.0-af04338413c3ed73316350f64248a152433073b6/arm64_v8a_profile-1.0.0-af04338413c3ed73316350f64248a152433073b6.jar'.         > Could not GET 'http://download.flutter.io/io/flutter/arm64_v8a_profile/1.0.0-af04338413c3ed73316350f64248a152433073b6/arm64_v8a_profile-1.0.0-af04338413c3ed73316350f64248a152433073b6.jar'.            > Read timed out                                                                                                                                                                                                          * Try:                                                                                                             Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

解决方案

- 你懂的

结语

截止到这里，纯Flutter项目的打包过程就讲述完了。

以下是我的Flutter系列的链接，后续会持续更新，欢迎大家指正。

Flutter 系列文章

Flutter 学习 - 开篇

Flutter 学习 - 基础框架

Flutter 学习 - 网络请求和数据解析

Flutter 学习 - Widget 之 Text

Flutter 学习 - Widget 之 RichText

Flutter 学习 - Widget 之 Image和Icon

Flutter 学习 - Widget 之 TextField

Flutter 学习 - Widget 之菜单按钮

Flutter 学习 - Widget 之布局 Widget

Flutter 学习 - 容器类Widget

Flutter 学习 - 可滚动的 Widget

Flutter 学习 - 功能类Widget

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Flutter 学习之打包 - 纯Flutter项目生成Android包_第1张图片

Flutter 学习之打包 - 纯Flutter项目生成Android包

结语

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