flutter混合开发运行报错：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时，运行host app发生崩溃：

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

找遍了google和flutter github的issue，
目前发现的可行解决办法如下：
1.在flutter module的build文件的android节点添加：

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

2.修改flutter_sdk目录下packages/flutter_tools/gradle/flutter.gradle：

change
variant.outputs[0].processResources.dependsOn(copyFlutterAssetsTask)
to
variant.outputs[0].processResources.dependsOn(flutterTask)

对比apk发现，assets文件夹下缺少flutter_shared或者flutter_assets会导致以上崩溃：

在这里插入图片描述