Flutter中的Gson

1l5u6lss  于 2022-11-06  发布在  Flutter
关注(0)|答案(1)|浏览(136)

我正在使用蓝牙开发Flutter应用程序。我正在本机平台中阅读一些特征值,然后将其发送到EventChannel上的Flutter

DeviceInfo deviceInfo = new DeviceInfo(deviceData, value);
            Gson gson = new Gson();
            String json;
            json = gson.toJson(deviceInfo);
            Log.d("GetDeviceInformation", gson.toJson(deviceInfo));
            deviceInformation.success(json);

在调试测试期间,一切都运行得很好。当我构建应用的发布版本时,我得到的唯一结果是空map {}。deviceInfo变量没有问题。我唯一的线索是,它可能与Gson和应用的发布版本有关。你有什么想法?

pvcm50d1

pvcm50d11#

Marcono 1234的回答为我指明了正确的方向。在app/build.gradle中添加了以下代码:

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

        minifyEnabled true
        useProguard true

        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}

并遵循proguard规则访问app/proguard-rules.pro:

-keep class com.example.**{ *; }

# Flutter Wrapper

-keep class io.flutter.app.**{ *; }
-keep class io.flutter.plugin.**{ *; }
-keep class io.flutter.util.**{ *; }
-keep class io.flutter.view.**{ *; }
-keep class io.flutter.**{ *; }
-keep class io.flutter.plugins.**{ *; }

## ---------------Begin: proguard configuration for Gson  ----------

# Gson uses generic type information stored in a class file when working with fields. Proguard

# removes such information by default, so configure it to keep all of it.

-keepattributes Signature

# For using GSON @Expose annotation

-keepattributes *Annotation*

# Gson specific classes

-dontwarn sun.misc.**

# -keep class com.google.gson.stream.**{ *; }

# Application classes that will be serialized/deserialized over Gson

-keep class com.google.gson.examples.android.model.**{ <fields>; }

# Prevent proguard from stripping interface information from TypeAdapter, TypeAdapterFactory,

# JsonSerializer, JsonDeserializer instances (so they can be used in @JsonAdapter)

-keep class * extends com.google.gson.TypeAdapter
-keep class * implements com.google.gson.TypeAdapterFactory
-keep class * implements com.google.gson.JsonSerializer
-keep class * implements com.google.gson.JsonDeserializer

# Prevent R8 from leaving Data object members always null

-keepclassmembers,allowobfuscation class * {
  @com.google.gson.annotations.SerializedName <fields>;
}

# Retain generic signatures of TypeToken and its subclasses with R8 version 3.0 and higher.

-keep,allowobfuscation,allowshrinking class com.google.gson.reflect.TypeToken
-keep,allowobfuscation,allowshrinking class * extends com.google.gson.reflect.TypeToken

## ---------------End: proguard configuration for Gson  ----------

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