Flutter_blue: not working in release

[SamiraIhsan]

the prob in Stream to get the state and scan devices, it work fine on debug but in release doesn't work

[bdlukaa]

Make sure you added the right permissions

[SamiraIhsan]

No, I have already added the correct permissions and it was it works fine, and same case for the example existing in this plugin, and it appears in flutter 1.22.5

[sornen]

Fix for this is discussed in #726

Use v0.7.2. In pubspec.yaml change to

 dependencies:
   flutter_blue: '0.7.2'

or for v0.7.3 compile with
flutter build apk --no-shrink

[SamiraIhsan]

Thanks, yes I have fixed the issue by adding
buildTypes {
release {
signingConfig signingConfigs.debug
shrinkResources false
minifyEnabled false
}
}

[jimykhan]

@SamiraIhsan same issue i am facing i try to create apk in release mode but flutter blue not working can you please guide how u fixed this issue please
where u add the following code

[SamiraIhsan]

@jimykhan add this code in [project_name]/android/app/build.gradle

    buildTypes {
        release {
            signingConfig signingConfigs.release
            shrinkResources false    // this line
            minifyEnabled false       // this line
        }
    }

[jimykhan]

thank you sir for ur response i did this but it not work for me
i am using flutter_blue 0.7.3 and flutter version 1.22.6 stable please let
me know if u have solution

On Mon, 22 Feb 2021 at 01:24, SamiraIhsan [e-mail] wrote:

add this code in [project_name]/android/app/build.gradle

buildTypes {
    release {
        signingConfig signingConfigs.release
        shrinkResources false    // this line
        minifyEnabled false       // this line
    }
}

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[meridorkobi]

I have the same issue
Did you try with 0.7.2?

[meridorkobi]

i solved the issue by adding
--no-shrink

to my build command

[jimykhan]

Yes, I did. But not working

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On Tue, Feb 23, 2021 at 1:30 AM Kobi [e-mail] wrote:

I have the same issue
Did you try with 0.7.2?

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[jimykhan]

mDevices size: 1 brother i also face this issue when i connect device it
not show in connected device

On Tue, 23 Feb 2021 at 02:01, Jamshed Khan [e-mail] wrote:

Yes, I did. But not working

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On Tue, Feb 23, 2021 at 1:30 AM Kobi [e-mail] wrote:

I have the same issue
Did you try with 0.7.2?

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[jeroen1602]

I made another issue with some proguard rules that work #784. They may be a bit too broad though.

[spekary]

@pauldemarco
Tried 0.8.0 and still seeing the problem. Building just in release mode, with none of the mods mentioned above:

E/flutter ( 1455): [ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: PlatformException(startScan, Field androidScanMode_ for c.c.a.y not found. Known fields are [private int c.c.a.y.f, private c.a.c.b0$i c.c.a.y.g, private boolean c.c.a.y.h, private static final c.c.a.y c.c.a.y.i, private static volatile c.a.c.a1 c.c.a.y.j], java.lang.RuntimeException: Field androidScanMode_ for c.c.a.y not found. Known fields are [private int c.c.a.y.f, private c.a.c.b0$i c.c.a.y.g, private boolean c.c.a.y.h, private static final c.c.a.y c.c.a.y.i, private static volatile c.a.c.a1 c.c.a.y.j]
E/flutter ( 1455):  at c.a.c.v0.n0(Unknown Source:72)
E/flutter ( 1455):  at c.a.c.v0.T(Unknown Source:697)
E/flutter ( 1455):  at c.a.c.v0.R(Unknown Source:12)
E/flutter ( 1455):  at c.a.c.k0.e(Unknown Source:60)
E/flutter ( 1455):  at c.a.c.k0.a(Unknown Source:49)
E/flutter ( 1455):  at c.a.c.d1.d(Unknown Source:17)
E/flutter ( 1455):  at c.a.c.d1.e(Unknown Source:4)
E/flutter ( 1455):  at c.a.c.z$a.A(Unknown Source:9)
E/flutter ( 1455):  at c.a.c.z$a.z(Unknown Source:4)
E/flutter ( 1455):  at c.a.c.z$a.m(Unknown Source:0)
E/flutter ( 1455):  at c.a.c.a$a.l(Unknown Source:2)
E/flutter ( 1455):  at c.c.a.b.q(Unknown Source:10)
E/flutter ( 1455):  at c.c.a.b.onMethodCall(Unknown Source:1583)
E/flutter ( 1455):  at d.a.c.a.j$a.a(Unknown Source:17)
E/flutter ( 1455):  at io.flutter.embedding.engine.e.b.d(Unknown Source:57)
E/flutter ( 1455):  at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(Unknown Source:4)
E/flutter ( 1455):  at android.os.MessageQueue.nativePollOnce(Native Method)
E/flutter ( 1455):  at android.os.MessageQueue.next(MessageQueue.java:336)
E/flutter ( 1455):  at android.os.Looper.loop(Looper.java:174)
E/flutter ( 1455):  at android.app.ActivityThread.main(ActivityThread.java:7405)
E/flutter ( 1455):  at java.lang.reflect.Method.invoke(Native Method)
E/flutter ( 1455):  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:502)
E/flutter ( 1455):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:980)
E/flutter ( 1455): , null)
E/flutter ( 1455): #0      FlutterBlue.scan (package:flutter_blue/src/flutter_blue.dart:123)

[ayushin]

Same problem, and no-shrink doesn't solve the problem in 0.8.0

[spekary]

I solved this by creating proguard rules on Android:

-keep class com.pauldemarco.flutter_blue.Protos* { *; }

Have yet to test on iOS though

[ayushin]

OK so for me the combination of --no-shrink and -keep class com.pauldemarco.flutter_blue.Protos* { *; }
worked finally.

Would be great to at least document it.

[d-wolf]

        shrinkResources false    // this line
        minifyEnabled false       // this line

@jimykhan add this code in [project_name]/android/app/build.gradle

    buildTypes {
        release {
            signingConfig signingConfigs.release
            shrinkResources false    // this line
            minifyEnabled false       // this line
        }
    }

This solves the problem for me with Version 0.8.0.

[MrCsabaToth]

I solved this by creating proguard rules on Android:

-keep class com.pauldemarco.flutter_blue.Protos* { *; }

Have yet to test on iOS though

1. Does -keep class com.pauldemarco.flutter_blue.* { *; } rule cover -keep class com.pauldemarco.flutter_blue.Protos* { *; } as well? (I think yes)
2. Aren't ProGuard rules Android only?

[alexflav23]

@MrCsabaToth How do you create proguard rules in flutter? apologies, beginner question.

[jeroen1602]

@alexflav23 sure, first you will need to create the proguards rules file at android/app/proguard-rules.pro. In this file add the proguard rules as described by ~@MrCsabaToth~ @d-wolf or in the issue #784. After this we will need to tell gradle that these rules exist.
Go into the android/app/build.gradle file and add the proguardFiles option to the correct build type. For you that would probably be:

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

I've added them to my own project so you can copy what you need from there: https://github.com/jeroen1602/lighthouse_pm/tree/master/android/app

Edit: here is the same link at a specific commit in case it changes in the future and someone still needs help https://github.com/jeroen1602/lighthouse_pm/tree/10eeccbd2200f82dbbff5dee27c18f76ea9151ea/android/app

For more info you can check the developer documentation https://developer.android.com/studio/build/shrink-code