Flutter项目集成jpush_flutter，安卓端编译失败的问题记录

Flutter项目集成了极光推送官方的flutter版SDK jpush_flutter

按照官方文档，在 /android/app/build.gradle 文件中添加了 ndk、manifestPlaceholders

安卓端编译时总是失败，控制台打印问题如下：

/Users/xxx/xx/flutter_app/android/app/src/main/AndroidManifest.xml:14:9-42 Error:
	Attribute application@name at AndroidManifest.xml:14:9-42 requires a placeholder substitution but no value for <applicationName> is provided.
/Users/xxx/xx/flutter_app/android/app/src/debug/AndroidManifest.xml Error:
	Validation failed, exiting

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:processDebugMainManifest'.
> Manifest merger failed with multiple errors, see logs

* 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 52s
Exception: Gradle task assembleDebug failed with exit code 1

请教了安卓同事大佬后，大佬提出解决方案：

原：
buildTypes {
    release {
        // TODO: Add your own signing config for the release build.
        // Signing with the debug keys for now, so `flutter run --release` works.
        signingConfig signingConfigs.debug
    }
}

buildTypes 中添加 debug、build 项，并且均添加

manifestPlaceholders = [applicationName: "android.app.Application"] 

改：
buildTypes {
    release {
        // TODO: Add your own signing config for the release build.
        // Signing with the debug keys for now, so `flutter run --release` works.
        signingConfig signingConfigs.debug
        manifestPlaceholders = [applicationName: "android.app.Application"]
    }

    debug {
        manifestPlaceholders = [applicationName: "android.app.Application"]
    }

    build {
        manifestPlaceholders = [applicationName: "android.app.Application"]
    }
}

修改后，编译通过。