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Flutter蓝牙在发布模式下无法正常工作。

flutterdartbluetoothflutter-dependencies
6
flutter run --release
Launching lib/main.dart on motorola one vision in release mode...
Running Gradle task 'assembleRelease'...                            3.6s
✓  Built build/app/outputs/flutter-apk/app-release.apk (6.6MB).

Flutter run key commands.
h List all available interactive commands.
c Clear the screen
q Quit (terminate the application on the device).
D/FlutterBluePlugin(20889): onAttachedToEngine
D/FlutterBluePlugin(20889): setup
D/FlutterBluePlugin(20889): onAttachedToActivity
E/flutter (20889): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: PlatformException(startScan, Field androidScanMode_ for j.e0 not found. Known fields are [private int j.e0.h, private k.b0$i j.e0.i, private boolean j.e0.j, private static final j.e0 j.e0.k, private static volatile k.a1 j.e0.l], java.lang.RuntimeException: Field androidScanMode_ for j.e0 not found. Known fields are [private int j.e0.h, private k.b0$i j.e0.i, private boolean j.e0.j, private static final j.e0 j.e0.k, private static volatile k.a1 j.e0.l]
E/flutter (20889):      at k.v0.n0(Unknown Source:72)
E/flutter (20889):      at k.v0.T(Unknown Source:655)
E/flutter (20889):      at k.v0.R(Unknown Source:12)
E/flutter (20889):      at k.k0.e(Unknown Source:60)
E/flutter (20889):      at k.k0.a(Unknown Source:49)
E/flutter (20889):      at k.d1.d(Unknown Source:17)
E/flutter (20889):      at k.d1.e(Unknown Source:4)
E/flutter (20889):      at k.z$a.z(Unknown Source:9)
E/flutter (20889):      at k.z$a.y(Unknown Source:4)
E/flutter (20889):      at k.z$a.o(Unknown Source:0)
E/flutter (20889):      at k.a$a.n(Unknown Source:2)
E/flutter (20889):      at j.h.K(Unknown Source:10)
E/flutter (20889):      at j.h.C(Unknown Source:2)
E/flutter (20889):      at j.h.i(Unknown Source:0)
E/flutter (20889):      at j.d.a(Unknown Source:6)
E/flutter (20889):      at j.h.v(Unknown Source:49)
E/flutter (20889):      at j.h.d(Unknown Source:1544)
E/flutter (20889):      at y.j$a.a(Unknown Source:17)
E/flutter (20889):      at m.c.j(Unknown Source:18)
E/flutter (20889):      at m.c.k(Unknown Source:20)
E/flutter (20889):      at m.c.g(Unknown Source:0)
E/flutter (20889):      at m.b.run(Unknown Source:12)
E/flutter (20889):      at android.os.Handler.handleCallback(Handler.java:938)
E/flutter (20889):      at android.os.Handler.dispatchMessage(Handler.java:99)
E/flutter (20889):      at android.os.Looper.loop(Looper.java:250)
E/flutter (20889):      at android.app.ActivityThread.main(ActivityThread.java:7806)
E/flutter (20889):      at java.lang.reflect.Method.invoke(Native Method)
E/flutter (20889):      at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
E/flutter (20889):      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:958)
E/flutter (20889): , null)
E/flutter (20889): #0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:607)
E/flutter (20889): #1      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:177)
E/flutter (20889): <asynchronous suspension>
E/flutter (20889): #2      FlutterBluePlus.scan (package:flutter_blue_plus/src/flutter_blue_plus.dart:145)
E/flutter (20889): <asynchronous suspension>
E/flutter (20889): #3      _httpConnectionHook.<anonymous closure> (dart:_http/embedder_config.dart:21)
E/flutter (20889): <asynchronous suspension>
E/flutter (20889):

当我尝试扫描设备时，我遇到了这个错误

但是当我在调试模式下运行应用程序时，它可以正常运行 我只使用了flutter_blue_plus插件 flutter_blue_plus：^1.1.2

这是我的Flutter doctor：

/opt/homebrew/Caskroom/flutter/2.8.1/flutter/bin/flutter doctor --verbose
[✓] Flutter (Channel stable, 2.10.2, on macOS 12.2 21D49 darwin-arm, locale en-GB)
    • Flutter version 2.10.2 at /opt/homebrew/Caskroom/flutter/2.8.1/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 097d3313d8 (9 days ago), 2022-02-18 19:33:08 -0600
    • Engine revision a83ed0e5e3
    • Dart version 2.16.1
    • DevTools version 2.9.2

[✓] Android toolchain - develop for Android devices (Android SDK version 32.0.0)
    • Android SDK at /Users/shaikmuzammilahmed/Library/Android/sdk
    • Platform android-32, build-tools 32.0.0
    • ANDROID_HOME = /Users/shaikmuzammilahmed/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.11+0-b60-7772763)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 13.2.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • CocoaPods version 1.11.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2021.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
       https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
       https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.11+0-b60-7772763)

[✓] VS Code (version 1.64.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension can be installed from:
       https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[✓] Connected device (2 available)
    • motorola one vision (mobile) • adb-ZF6224N9MH-ZBFJSA._adb-tls-connect._tcp. • android-arm64  • Android 11 (API 30)
    • Chrome (web)                 • chrome                                       • web-javascript • Google Chrome 98.0.4758.109

[✓] HTTP Host Availability
    • All required HTTP hosts are available

• No issues found!
在调试模式下是否出现任何异常？ - Rohith Nambiar
不，我在调试模式下没有遇到任何异常，一切都在调试模式下正常工作。 - afran muzammil
好的，shrinkResources 在 android/app/build.gradle 中启用了吗？ - Rohith Nambiar
签名配置 signingConfigs.debug 缩小资源 false - afran muzammil
你是否已经添加了Proguard? 请在此处检查 https://github.com/boskokg/flutter_blue_plus/issues/7 - kiyosuke
2个回答
14
告诉ProGuard忽略flutter_blue(_plus)文件。

  1. 在您的应用程序文件夹中添加proguard-rules.pro文件

  2. 确保在您的应用程序build.gradle文件中引用该文件，例如：

android {
  buildTypes {
    release {
      minifyEnabled true
      shrinkResources true
      proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
    }
  }
}
  1. 在 pro guard-rules.pro 文件中明确告诉 ProGuard 忽略什么。选取你实际使用的库所在的那一行。
# for flutter_blue_plus
-keep class com.boskokg.flutter_blue_plus.** { *; }

# for flutter_blue
-keep class com.pauldemarco.flutter_blue.** { *; }
谢谢@Christian。有没有iOS的建议？我在iOS上遇到了类似的问题，而且这是随机的情况。 - CoDe
0
在你的项目 build.gradle 文件中添加以下行：
=> [项目名称]/android/app/build.gradle 
buildTypes {
        release {
            signingConfig signingConfigs.release
            minifyEnabled true
            shrinkResources true
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
3
如果禁用代码压缩和缩小，您将不会混淆发布的代码。您不应该建议禁用这些功能而不发出警告。对于生产应用程序，即使它似乎可以工作，这对绝大多数人来说仍然不足够 - 应该修复潜在问题而不是忽略它。 - Saik Caskey
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