VM snapshot must be valid.
解决方式，在 flutter module 执行 flutter clean，然后 flutter run，就行了
- Import flutter module to your HOST app(set binding, implementation, and instantiate view/fragment)
- When you clean/rebuild from HOST app, flutter module does not generate properly
- You need to open your flutter module in a separate AS
- flutter clean
- cd .android
- ./gradlew clean
- ./gradlew assembleDebug
- Return to host app and run app(do not sync or rebuild) :)
https://github.com/flutter/flutter/issues/24268
send image form android to flutter by channel
You can't pass a raw bitmap to Image.memory because it doesn't contain enough information, notably width and height. The Image constructors need a recognized file format: JPEG, PNG, GIF, Animated GIF, WebP, Animated WebP, BMP, and WBMP.
直接把bitmap传给flutter是不行的，那边没有足够的信息来decode，所以需要拼接
(stackoverflow)[https://stackoverflow.com/questions/51516310/sending-bitmap-to-flutter-from-android-platform]
so库兼容问题
ndk {
abiFilters 'armeabi', 'armeabi-v7a', 'arm64-v8a'
}
在上述情况下，libflutter.so库默认只会打包进armeabi-v7a的包中，导致其余两种ABI架构的手机崩溃，如果只有armeabi-v7a包的情况下，arm64-v8a可以向下兼容，无特殊需求的情况下，可以将上述配置改为如下，快速规避问题
ndk {
abiFilters 'armeabi-v7a'
}
通过修改flutter框架，规避解决so库问题
修改 packages/flutter_tools/gradle/flutter.gradle，给缺少libflutter.so的架构加上libflutter.so，步骤如下：
在flutter.gradle中加入如下方法：
//==========================================arm64-v8 & armeabi支持=====================================================
private void initv8FlutterJar(Project project) {
String targetArch = 'arm64'
Path baseEnginePath = Paths.get(flutterRoot.absolutePath, "bin", "cache", "artifacts", "engine")
debugFlutterJar_V8 = baseEnginePath.resolve("android-${targetArch}").resolve("flutter.jar").toFile()
profileFlutterJar_V8 = baseEnginePath.resolve("android-${targetArch}-profile").resolve("flutter.jar").toFile()
releaseFlutterJar_V8 = baseEnginePath.resolve("android-${targetArch}-release").resolve("flutter.jar").toFile()
dynamicProfileFlutterJar_V8 = baseEnginePath.resolve("android-${targetArch}-dynamic-profile").resolve("flutter.jar").toFile()
dynamicReleaseFlutterJar_V8 = baseEnginePath.resolve("android-${targetArch}-dynamic-release").resolve("flutter.jar").toFile()
}
private File v8flutterJarFor(buildMode) {
if (buildMode == "profile") {
return profileFlutterJar_V8
} else if (buildMode == "dynamicProfile") {
return dynamicProfileFlutterJar_V8
} else if (buildMode == "dynamicRelease") {
return dynamicReleaseFlutterJar_V8
} else if (buildMode == "debug") {
return debugFlutterJar_V8
}
return releaseFlutterJar_V8
}
private void addv8FlutterArmeabiJarApiDependency(Project project, def buildType) {
File chosenFlutterJar = v8flutterJarFor(buildModeFor(buildType))
File flutterARM64Jar = project.file("${project.buildDir}/${AndroidProject.FD_INTERMEDIATES}/flutter/arm64/${buildType.name}/flutter-arm64.jar")
Task flutterARM64JarTask = project.tasks.create("${flutterBuildPrefix}${buildType.name.capitalize()}ARM64V8Jar", Jar) {
destinationDir flutterARM64Jar.parentFile
archiveName flutterARM64Jar.name
from(project.zipTree(chosenFlutterJar).matching{
include "lib/arm64-v8a/libflutter.so"
}) {
eachFile {def fcp ->
if (fcp.relativePath.pathString.contains("lib/arm64-v8a/libflutter.so")) {
fcp.path = "lib/arm64-v8a/libflutter.so"
} else {
fcp.exclude()
}
}
}
}
if (flutterARM64JarTask == null) {
return
}
Task javacTask = project.tasks.findByName("compile${buildType.name.capitalize()}JavaWithJavac")
if (javacTask) {
javacTask.dependsOn flutterARM64JarTask
}
Task kotlinTask = project.tasks.findByName("compile${buildType.name.capitalize()}Kotlin")
if (kotlinTask) {
kotlinTask.dependsOn flutterARM64JarTask
}
project.dependencies {
String configuration;
if (project.getConfigurations().findByName("api")) {
configuration = buildType.name + "Api";
} else {
configuration = buildType.name + "Compile";
}
add(configuration, project.files {
flutterARM64JarTask
})
}
}
//==========================================armeabi支持=====================================================
/**
* create armeabi task
*/
private Task createArmeabiTask(Project project, String taskName, File flutterJar, File flutterArmV7Jar) {
def flutterArmeabiJarTask = project.tasks.create(taskName, Jar) {
destinationDir flutterArmV7Jar.parentFile
archiveName flutterArmV7Jar.name
from(project.zipTree(flutterJar).matching {
//仅包含armeabi-v7a的so
include "lib/armeabi-v7a/libflutter.so"
}) {
eachFile {def fcp ->
if (fcp.relativePath.pathString.contains("lib/armeabi-v7a/libflutter.so")) {
//重命名路径，否则会拷贝到v7a目录
fcp.path = "lib/armeabi/libflutter.so"
} else {
//非so排除
fcp.exclude()
}
}
}
}
return flutterArmeabiJarTask
}
/**
* add armeabi so for prebuilt engine
*/
private void addFlutterArmeabiJarApiDependency(Project project, def buildType, String targetArch) {
def flutterArmeabiJarTask = null
if (targetArch == 'arm') {
File flutterJar = flutterJarFor(buildModeFor(buildType))
File flutterArmV7Jar = project.file("${project.buildDir}/${AndroidProject.FD_INTERMEDIATES}/flutter/armeabi/${buildType.name}/flutter-armeabi.jar")
flutterArmeabiJarTask = createArmeabiTask(project, "${flutterBuildPrefix}${buildType.name.capitalize()}ArmeabiJar", flutterJar, flutterArmV7Jar)
}
if (flutterArmeabiJarTask == null) {
return
}
Task javacTask = project.tasks.findByName("compile${buildType.name.capitalize()}JavaWithJavac")
if (javacTask) {
javacTask.dependsOn flutterArmeabiJarTask
}
Task kotlinTask = project.tasks.findByName("compile${buildType.name.capitalize()}Kotlin")
if (kotlinTask) {
kotlinTask.dependsOn flutterArmeabiJarTask
}
project.dependencies {
String configuration;
if (project.getConfigurations().findByName("api")) {
configuration = buildType.name + "Api";
} else {
configuration = buildType.name + "Compile";
}
add(configuration, project.files {
flutterArmeabiJarTask
})
}
}
//==========================================arm64-v8 & armeabi支持=====================================================
/**
在如下位置加上对应代码
project.android.buildTypes.each {
addFlutterJarApiDependency(project, it, flutterX86JarTask)
//==========================================arm64-v8 & armeabi支持=====================================================
addFlutterArmeabiJarApiDependency(project, it, targetArch)
addv8FlutterArmeabiJarApiDependency(project, it)
//==========================================arm64-v8 & armeabi支持=====================================================
}
project.android.buildTypes.whenObjectAdded {
addFlutterJarApiDependency(project, it, flutterX86JarTask)
//==========================================arm64-v8 & armeabi支持=====================================================
addFlutterArmeabiJarApiDependency(project, it, targetArch)
addv8FlutterArmeabiJarApiDependency(project, it)
//==========================================arm64-v8 & armeabi支持=====================================================
}
参考链接
flutter-engin指北
Flutter原理与实践