On release mode app crash

[bilguunint]

App crashed on release mode

[Michael24884]

You might want to also post your crash log

App crashed on release mode

[soska12]

Same crash here too.
Log:
2020-03-14 19:28:16.811 23607-23607/? E/VLC/LibVLC: Can't load vlcjni library: java.lang.UnsatisfiedLinkError: JNI_ERR returned from JNI_OnLoad in "/data/app/com.example-1/lib/arm/libvlcjni.so"

[vassilux]

Hi,
App work good on debug I got crach in release
this is log

03-30 11:05:22.497 6679 6679 E VLC/JNI/VLCObject: FindClass(org/videolan/libvlc/Media$Track) failed
03-30 11:05:22.497 6679 6679 E VLC/LibVLC: Can't load vlcjni library: java.lang.UnsatisfiedLinkError: JNI_ERR returned from JNI_OnLoad in "/data/app/com.esigroup.spacecontrol-1/lib/arm64/libvlcjni.so"

Any idea

[soska12]

Hi,
App work good on debug I got crach in release
this is log

03-30 11:05:22.497 6679 6679 E VLC/JNI/VLCObject: FindClass(org/videolan/libvlc/Media$Track) failed
03-30 11:05:22.497 6679 6679 E VLC/LibVLC: Can't load vlcjni library: java.lang.UnsatisfiedLinkError: JNI_ERR returned from JNI_OnLoad in "/data/app/com.esigroup.spacecontrol-1/lib/arm64/libvlcjni.so"

Any idea

I managed to solve that issue. Basically it's a flutter side problem, all flutter release mode apps minified and obfuscated by default.
So you have to set

release {
            signingConfig signingConfigs.release
            minifyEnabled true
            useProguard true
            proguardFiles getDefaultProguardFile(
                    'proguard-android-optimize.txt'),
                    'proguard-rules.pro'
        }

and add proguard rules in the file proguard-rules.pro:

#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.**  { *; }
-keep class org.videolan.libvlc.** { *; } 

After this its working fine for me also in release mode :)

[vassilux]

Hi @soska12 ,
Thank for you help it works !!!

[azulmouad]

New Version build.gradle.kts:

 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.getByName("debug")
            isMinifyEnabled = true
            isShrinkResources = false

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

create file android/proguard-rules.pro

# Keep all VLC classes (especially used via JNI)
-keep class org.videolan.libvlc.** { *; }
-keep interface org.videolan.libvlc.** { *; }
-keep class * extends org.videolan.libvlc.** { *; }
-dontwarn org.videolan.libvlc.**

```