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安卓 Native+Flutter 应用开发实战

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安装完Flutter插件及Flutter SDK后,执行flutter doctor一直不动问题
这是因为被墙了,参阅官方文档《Using Flutter in China》:https://flutter.dev/community/china
其实也就是添加两个系统环境变量,Windows系统桌面右键点击我的电脑->属性->高级系统设置->环境变量:
PUB_HOSTED_URL=https://pub.flutter-io.cn
FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn
设置好上面两个环境变量后重启flutter_console.bat,再次执行`flutter doctor --verbose`即可。
在Android Studio中准备好Dart & Flutter插件及SDK后,无法连接模拟器。
因为Android SDK的位置不是默认的C:\Users\Administrator\AppData\Local\Android\Sdk导致的,新增系统环境变量“ANDROID_HOME”指向自己的Android SDK的位置,在系统环境变量“Path”增加“%ANDROID_HOME%\platform-tools”,重启Android Studio即可。
运行提示“Android dependency 'androidx...' has different version for the compile...”。
这是多个安卓模块依赖的androidx版本冲突导致的,问题讨论参见 https://github.com/flutter/flutter/issues/27254#issuecomment-525616582
解决办法一:
Upgrade Android Gradle Plugin and Gradle to the latest version can solve this problem. For Android Studio 3.5, modify these:

android/build.gradle:
com.android.tools.build:gradle:3.5.0

android/gradle/wrapper/gradle-wrapper.properties:
distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip
解决办法二:
Of course, you should manually set the same version via DependencyResolution. So, the following resolution strategy can also be used to resolve the conflicts of dependency :

android/gradle.properties:
androidxCoreVersion=1.0.0
androidxLifecycleVersion=2.0.0

android/build.gradle:
subprojects {
    project.configurations.all {
        resolutionStrategy {
            force "androidx.core:core:${androidxCoreVersion}"
            force "androidx.lifecycle:lifecycle-common:${androidxLifecycleVersion}"
        }
    }
}
构建正式包报错提示“Conflicting configuration : '...' in ndk abiFilters cannot be present when splits abi filters are set : ...”
这是因为使用带“--split-per-abi”参数(如flutter build apk --release --split-per-abi --target-platform android-arm)的构建命令和安卓原生的build.gradle里配置的“ndk.abiFilters”或“splits.abi”冲突,删掉“ndk.abiFilters”或“splits.abi”节点即可。
目测截止2019.8.28,Flutter的发布包貌似只支持armeabi-v7a及arm64-v8a,使用“--target-platform android-x86”参数构建会报错"android-x86" is not an allowed value for option "target-platform"。
Flutter I18N插件生成的“generated/i18n.dart”未包含arb中设置的语言?
可能是arb文件内容格式或命名不正确。必须是JSON格式,只能是一个层级的键值对,键名不能含下划线(最好用小驼峰命名法)

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