Flutter问题解决之Waitingforanotherfluttercommandtoreleasethestartuplock.

前段时间系统重装了一次之后&＃xff0c;执行Flutter的Packages get一直卡在这里&＃xff0c;再执行一次报这个问题Waiting for another flutter command to release the startup lock.查看了一下资料&＃xff0c;找到了以下方法&＃xff1a;

1&＃xff1a;关闭 as

2&＃xff1a;CTRL&＃43;ALT&＃43;DEL 关闭所有 dart进程和android进程,注意adb这个别忘了关

3&＃xff1a;打开 flutter 安装目录  如&＃xff1a;...\flutter\bin\cache

　　　　删除里面的 lockfile

4&＃xff1a;打开 as 先点击下面的 Invalidate 再打开此窗口 点击 Just Restart。

执行以上操作&＃xff0c;然后有反应了&＃xff0c;报了以下问题&＃xff1a;

OS Error: 信号灯超时时间已到

, errno &＃61; 121, address &＃61; pub.dartlang.org, port &＃61; 53249

 虽然遇到了新问题&＃xff0c;但也算一种进展吗&＃xff1f;不怕它有反应&＃xff0c;就怕它没反应啊!继续查询相关问题~

Google搜索一下&＃xff0c;原来flutter 已经有对策了。

Using Flutter in China 。

大概意思就是 把默认的 package 获取地址改为访问没有问题的镜像站就可以了。

具体操作

• Linux 或 Mac

export PUB_HOSTED_URL&＃61;https://pub.flutter-io.cn

export FLUTTER_STORAGE_BASE_URL&＃61;https://storage.flutter-io.cn

• Windows

新增两个环境变量即可

PUB_HOSTED_URL &＃61;&＃61;&＃61;&＃61;&＃61; https://pub.flutter-io.cn

FLUTTER_STORAGE_BASE_URL &＃61;&＃61;&＃61;&＃61;&＃61; https://storage.flutter-io.cn

执行一下 flutter doctor命令

下载在 package get 应该就没有问题了。

flutter混合开发运行报错&＃xff1a;VM snapshot must be valid. /Check failed: vm. Must be able to initialize the VM.

在现有android项目中集成flutter_boost时&＃xff0c;运行host app发生崩溃&＃xff1a;

VM snapshot must be valid.
Check failed: vm. Must be able to initialize the VM.


查找资料得知&＃xff0c;需要将flutter_sdk目录下packages/flutter_tools/gradle/flutter.gradle&＃xff1a;
这句话
variant.outputs[0].processResources.dependsOn(copyFlutterAssetsTask)
改为
variant.outputs[0].processResources.dependsOn(flutterTask)

另外需要在fluttermodule的build文件Flutter/build.gradle的android{}节点添加&＃xff1a;

project.android.libraryVariants.all { variant ->def targetAssets &＃61; "${project.buildDir}/intermediates/flutter/${variant.name}"def customSourceSet &＃61; variant.getSourceSets()[0]if (customSourceSet instanceof com.android.build.gradle.internal.api.DefaultAndroidSourceSet) {customSourceSet &＃61; (com.android.build.gradle.internal.api.DefaultAndroidSourceSet)customSourceSetcustomSourceSet.getAssets().srcDirs(targetAssets)}
}

对比项目&＃xff0c;fluttermodule/.android/Flutter/Build/intermediates/flutter文件夹下&＃xff0c;如果缺少debug/flutter_assets会导致主项目Flutter下也缺少这个文件夹&＃xff0c;导致项目崩溃。

对比apk发现&＃xff0c;assets文件夹下缺少flutter_shared或者flutter_assets会导致以上崩溃。

Flutter 打包问题 Could not resolve io.flutter:arm64_v8a_release解决

问题日志

Running Gradle task &＃39;assembleRelease&＃39;...
FAILURE: Build failed with an exception.
* What went wrong:
Could not determine the dependencies of task &＃39;:app:processReleaseResources&＃39;.
> Could not resolve all task dependencies for configuration &＃39;:app:releaseRuntimeClasspath&＃39;.> Could not resolve io.flutter:arm64_v8a_release:1.0.0-b851c718295a896918dc93cb1ff14f2f895a1b90.Required by:project :app> Could not resolve io.flutter:arm64_v8a_release:1.0.0-b851c718295a896918dc93cb1ff14f2f895a1b90.> Could not get resource &＃39;https://storage.googleapis.com/download.flutter.io/io/flutter/arm64_v8a_release/1.0.0-b851c718295a896918dc93cb1ff14f2f895a1b90/arm64_v8a_release-1.0.0-b851c718295a896918dc93cb1ff14f2f895a1b90.pom&＃39;.> Could not GET &＃39;https://storage.googleapis.com/download.flutter.io/io/flutter/arm64_v8a_release/1.0.0-b851c718295a896918dc93cb1ff14f2f895a1b90/arm64_v8a_release-1.0.0-b851c718295a896918dc93cb1ff14f2f895a1b90.pom&＃39;.> Connect to storage.googleapis.com:443 [storage.googleapis.com/34.64.4.16] failed: Connection timed out: connect> Could not resolve io.flutter:arm64_v8a_release:1.0.0-b851c718295a896918dc93cb1ff14f2f895a1b90.> Could not get resource &＃39;https://storage.googleapis.com/download.flutter.io/io/flutter/arm64_v8a_release/1.0.0-b851c718295a896918dc93cb1ff14f2f895a1b90/arm64_v8a_release-1.0.0-b851c718295a896918dc93cb1ff14f2f895a1b90.pom&＃39;.> Could not GET &＃39;https://storage.googleapis.com/download.flutter.io/io/flutter/arm64_v8a_release/1.0.0-b851c718295a896918dc93cb1ff14f2f895a1b90/arm64_v8a_release-1.0.0-b851c718295a896918dc93cb1ff14f2f895a1b90.pom&＃39;.> Connect to storage.googleapis.com:443 [storage.googleapis.com/34.64.4.80] failed: Connection timed out: connect> Could not resolve io.flutter:arm64_v8a_release:1.0.0-b851c718295a896918dc93cb1ff14f2f895a1b90.> Could not get resource &＃39;https://storage.googleapis.com/download.flutter.io/io/flutter/arm64_v8a_release/1.0.0-b851c718295a896918dc93cb1ff14f2f895a1b90/arm64_v8a_release-1.0.0-b851c718295a896918dc93cb1ff14f2f895a1b90.pom&＃39;.> Could not GET &＃39;https://storage.googleapis.com/download.flutter.io/io/flutter/arm64_v8a_release/1.0.0-b851c718295a896918dc93cb1ff14f2f895a1b90/arm64_v8a_release-1.0.0-b851c718295a896918dc93cb1ff14f2f895a1b90.pom&＃39;.> Connect to storage.googleapis.com:443 [storage.googleapis.com/34.64.4.80] failed: Connection timed out: connect* 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 8m 15s
Running Gradle task &＃39;assembleRelease&＃39;...
Running Gradle task &＃39;assembleRelease&＃39;... Done 496.8s (!)
Gradle task assembleRelease failed with exit code 1


解决办法

1.你自己的磁盘:\flutter\packages\flutter_tools\gradle\flutter.gradle

buildscript {repositories {//注释以前的//google()// jcenter()///增加这段代码maven { url&＃39;https://maven.aliyun.com/repository/google&＃39;}maven { url&＃39;https://maven.aliyun.com/repository/jcenter&＃39;}maven { url&＃39;http://maven.aliyun.com/nexus/content/groups/public&＃39;}}dependencies {classpath &＃39;com.android.tools.build:gradle:3.5.0&＃39;}
}
class FlutterPlugin implements Plugin {//原下载路径//private static final String MAVEN_REPO &＃61; "https://storage.googleapis.com/download.flutter.io";//修改后的下载路径private static final String MAVEN_REPO &＃61; "https://storage.flutter-io.cn/download.flutter.io"project.rootProject.allprojects {repositories {maven {url repository}///增加这段代码maven { url&＃39;https://maven.aliyun.com/repository/google&＃39;}maven { url&＃39;https://maven.aliyun.com/repository/jcenter&＃39;}maven { url&＃39;http://maven.aliyun.com/nexus/content/groups/public&＃39;}
}


2.项目位置:项目名/android/build.gradle

buildscript {ext.kotlin_version &＃61; &＃39;1.3.50&＃39;repositories {/* google()jcenter()*/maven{ url &＃39;https://maven.aliyun.com/repository/google&＃39; }maven{ url &＃39;https://maven.aliyun.com/repository/jcenter&＃39; }maven{ url &＃39;https://maven.aliyun.com/repository/public&＃39;}maven{ url &＃39;https://maven.aliyun.com/repository/gradle-plugin&＃39;}}dependencies {classpath &＃39;com.android.tools.build:gradle:3.5.0&＃39;classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"}
}allprojects {repositories {/* google()jcenter()*/maven{ url &＃39;https://maven.aliyun.com/repository/google&＃39; }maven{ url &＃39;https://maven.aliyun.com/repository/jcenter&＃39; }maven{ url &＃39;https://maven.aliyun.com/repository/public&＃39;}maven{ url &＃39;https://maven.aliyun.com/repository/gradle-plugin&＃39;}}
}rootProject.buildDir &＃61; &＃39;../build&＃39;
subprojects {project.buildDir &＃61; "${rootProject.buildDir}/${project.name}"
}
subprojects {project.evaluationDependsOn(&＃39;:app&＃39;)
}task clean(type: Delete) {delete rootProject.buildDir
}

解决成功日志

G:\workspaces\intelligent-logistics-app>flutter build apk
You 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&＃39;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-x64Learn more on: https://developer.android.com/guide/app-bundleTo split the APKs per ABI, run:flutter build apk --target-platform android-arm,android-arm64,android-x64 --split-per-abiLearn more on: https://developer.android.com/studio/build/configure-apk-splits#configure-abi-split
Running Gradle task &＃39;assembleRelease&＃39;...
Removed unused resources: Binary resource data reduced from 894KB to 884KB: Removed 1%
Running Gradle task &＃39;assembleRelease&＃39;...
Running Gradle task &＃39;assembleRelease&＃39;... Done 216.2s (!)
√ Built build\app\outputs\apk\release\app-release.apk (27.0MB).

解决Error: Unable to ‘pub upgrade‘ flutter tool

运行 flutter doctor时终端报错信息如下&＃xff1a;

Updating flutter tool...
The system cannot find the path specified.
Error: Unable to &＃39;pub upgrade&＃39; flutter tool. Retrying in five seconds...

删除 flutter&＃39;\bin 目录下的 cache 文件夹&＃xff0c;重新运行flutter doctor