Launching lib\main.dart on MHA AL00 in debug mode...
Running Gradle task 'assembleDebug'...
FAILURE: Build failed with an exception.
* What went wrong:
Could not determine the dependencies of task ':app:processDebugResources'.
> Could not resolve all task dependencies for configuration ':app:debugRuntimeClasspath'.
> Could not resolve com.github.Polidea:MultiPlatformBleAdapter:0.1.8.
Required by:
project :app > project :flutter_ble_lib
> Could not resolve com.github.Polidea:MultiPlatformBleAdapter:0.1.8.
> Could not get resource 'https://jcenter.bintray.com/com/github/Polidea/MultiPlatformBleAdapter/0.1.8/MultiPlatformBleAdapter-0.1.8.pom'.
> Could not HEAD 'https://jcenter.bintray.com/com/github/Polidea/MultiPlatformBleAdapter/0.1.8/MultiPlatformBleAdapter-0.1.8.pom'.
> 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.
* Get more help at https://help.gradle.org
BUILD FAILED in 1m 36s
Exception: Gradle task assembleDebug failed with exit code 1
我们可以看到 Read timed out，可能是网络的问题，之前还好好的，因为将flutter升级到2.0之后就出现了，第一反应是不是版本问题，可是奇怪的是无论怎么修改都报这个错误。
之后就是一顿折腾代理的问题，发现还是不能解决。其实上面报错很清晰，就是jcenter的问题。
我们可以打开https://status.bintray.com/
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为什么没有更新之前没这个问题？因为你的包已经下载到本地，不会再去jcenter拉取，升级之后upgrade自然要去拉取，然后报错了。
我们知道jcenter只是一个托管中心罢了，我们要怎么解决问题，毕竟工作还得继续。
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在External Libraries --》 Flutter Plugins随便找一个包右键show in Explorer，mac环境有点区别，这里不展开。
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我们可以看到打开了一个文件夹
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继续解决我们的问题，报错的是flutter_ble_lib: ^2.3.0引入的
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进入.cache文件夹，可以发现 包名-versions.json的文件，
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在http://www.bejson.com/格式化后如下(中间删掉了一些版本，其实versions只留需要的版本就可以了，列出来的是因为有一些其他依赖需要不同版本的时候会去拉取)
{
"name": "flutter_ble_lib",
"latest": {
"version": "2.3.2",
"pubspec": {
"name": "flutter_ble_lib",
"description": "FlutterBle Library is a flutter library that supports BLE operations. It uses MultiPlatformBleAdapter as a native backend..",
"version": "2.3.2",
"homepage": "https://github.com/Polidea/FlutterBleLib",
"environment": {
"sdk": ">=2.1.0 <3.0.0",
"flutter": ">=1.10.0 <2.0.0"
},
"dependencies": {
"collection": "^1.14.11",
"async": "^2.2.0",
"flutter": {
"sdk": "flutter"
}
},
"dev_dependencies": {
"test": "^1.5.3",
"mockito": "^4.0.0",
"pedantic": "^1.9.0",
"flutter_test": {
"sdk": "flutter"
}
},
"flutter": {
"plugin": {
"platforms": {
"android": {
"package": "com.polidea.flutter_ble_lib",
"pluginClass": "FlutterBleLibPlugin"
},
"ios": {
"pluginClass": "FlutterBleLibPlugin"
}
}
}
}
},
"archive_url": "https://pub.flutter-io.cn/packages/flutter_ble_lib/versions/2.3.2.tar.gz",
"published": "2021-02-03T18:23:22.088342Z"
},
"versions": [{
"version": "1.0.0",
"pubspec": {
"version": "1.0.0",
"dependencies": {
"protobuf": "^0.6.0",
"convert": "^2.0.1",
"flutter": {
"sdk": "flutter"
}
},
"name": "flutter_ble_lib",
"author": "Polidea",
"flutter": {
"plugin": {
"androidPackage": "com.polidea.flutterblelib",
"pluginClass": "FlutterBleLibPlugin"
}
},
"description": "FlutterBle Library is a flutter library that supports ble connections. It uses RxAndroidBle and RxBluetoothKit as native libs.",
"homepage": "https://github.com/Polidea/FlutterBleLib",
"environment": {
"sdk": ">=1.8.0 <2.0.0"
}
},
"archive_url": "https://pub.flutter-io.cn/packages/flutter_ble_lib/versions/1.0.0.tar.gz",
"published": "2018-03-02T10:29:01.312778Z"
}, {
"version": "2.3.2",
"pubspec": {
"name": "flutter_ble_lib",
"description": "FlutterBle Library is a flutter library that supports BLE operations. It uses MultiPlatformBleAdapter as a native backend..",
"version": "2.3.2",
"homepage": "https://github.com/Polidea/FlutterBleLib",
"environment": {
"sdk": ">=2.1.0 <3.0.0",
"flutter": ">=1.10.0 <2.0.0"
},
"dependencies": {
"collection": "^1.14.11",
"async": "^2.2.0",
"flutter": {
"sdk": "flutter"
}
},
"dev_dependencies": {
"test": "^1.5.3",
"mockito": "^4.0.0",
"pedantic": "^1.9.0",
"flutter_test": {
"sdk": "flutter"
}
},
"flutter": {
"plugin": {
"platforms": {
"android": {
"package": "com.polidea.flutter_ble_lib",
"pluginClass": "FlutterBleLibPlugin"
},
"ios": {
"pluginClass": "FlutterBleLibPlugin"
}
}
}
}
},
"archive_url": "https://pub.flutter-io.cn/packages/flutter_ble_lib/versions/2.3.2.tar.gz",
"published": "2021-02-03T18:23:22.088342Z"
}, {
"version": "3.0.0-beta",
"pubspec": {
"name": "flutter_ble_lib",
"description": "FlutterBle Library is a flutter library that supports BLE operations. It uses MultiPlatformBleAdapter as a native backend..",
"version": "3.0.0-beta",
"homepage": "https://github.com/Polidea/FlutterBleLib",
"environment": {
"sdk": ">=2.1.0 <3.0.0",
"flutter": ">=1.10.0 <2.0.0"
},
"dependencies": {
"collection": "^1.14.11",
"async": "^2.2.0",
"flutter": {
"sdk": "flutter"
}
},
"dev_dependencies": {
"test": "^1.5.3",
"mockito": "^4.0.0",
"pedantic": "^1.9.0",
"flutter_test": {
"sdk": "flutter"
}
},
"flutter": {
"plugin": {
"platforms": {
"android": {
"package": "com.polidea.flutter_ble_lib",
"pluginClass": "FlutterBleLibPlugin"
},
"ios": {
"pluginClass": "FlutterBleLibPlugin"
}
}
}
}
},
"archive_url": "https://pub.flutter-io.cn/packages/flutter_ble_lib/versions/3.0.0-beta.tar.gz",
"published": "2020-12-11T16:50:26.780270Z"
}],
"_fetchedAt": "2021-03-16T11:23:47.729505"
}
查看该插件所引入的Android包，打开build.gradle
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找到了罪魁祸首MultiPlatformBleAdapter包
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那么我们只要手动下载之后放到对应的位置即可（不同人的gradle存放的位置不一样）。之前我是下载过1.0.6版本的，打开.gradle\caches\modules-2\files-2.1\com.github.Polidea\MultiPlatformBleAdapter
0.1.6里面是有aar包的，而0.1.8还没有下载好所以里面只有一个pom文件（pom其实就是aar或者jar依赖的其他第三方工程的一个配置文件），这个也是我们报错的地方。
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从github我们找到了
https://github.com/Polidea/MultiPlatformBleAdapter/releases对应的1.0.8版本，点击下载
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打开.gradle\caches\modules-2\files-2.1，将刚刚下载的包解压出来的是源码，我们需要的是aar文件
Androidstudio打开源码，编译aar
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