official SDK demo release crash

[uiiang]

Excuse me, I have a question. In the official Brother Print SDK demo, I added the following code to the build.gradle.kts file and signed it:

getByName("debug") {
  isMinifyEnabled = true
  isShrinkResources = true
      proguardFiles(
        getDefaultProguardFile("proguard-android-optimize.txt"),
        "proguard-rules.pro",
      )
  signingConfig = signingConfigs.getByName("release")
}
getByName("release") {
  isMinifyEnabled = true
  isShrinkResources = true
      proguardFiles(
        getDefaultProguardFile("proguard-android-optimize.txt"),
        "proguard-rules.pro",
      )
  signingConfig = signingConfigs.getByName("release")
}

After performing assembleRelease, The demo app crashes when call PrinterDriverGenerator.openChannel

PrinterDriverGenerator.openChannel(channel)

etc: PrinterInfoFragment.kt line 68-69
Here's the error log:

16:01:28.370  A  Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0 in tid 27372 (DefaultDispatch), pid 27298 (h.sdk.printdemo)
pid: 27298, tid: 27372, name: DefaultDispatch  >>> com.brother.ptouch.sdk.printdemo <<<
#01 pc 000000000010d464  /data/app/~~ETEnF5_f0w4xMzEwHj2CkA==/com.brother.ptouch.sdk.printdemo-C0gyqpilYkM-CwZTae0xFQ==/base.apk!libcreatedata.so (offset 0x108000) (Java_com_brother_ptouch_sdk_JNIWrapper_sendLogToGlobalLoggingV3JNI+268) (BuildId: 64beb171e60467fd60220ae07d11632b0472b453)
#02 pc 000000000001f7e0  /data/app/~~ETEnF5_f0w4xMzEwHj2CkA==/com.brother.ptouch.sdk.printdemo-C0gyqpilYkM-CwZTae0xFQ==/oat/arm64/base.odex (art_jni_trampoline+224)
#09 pc 00000000000878e6  /data/app/~~ETEnF5_f0w4xMzEwHj2CkA==/com.brother.ptouch.sdk.printdemo-C0gyqpilYkM-CwZTae0xFQ==/oat/arm64/base.vdex (B0.c.f0+1434)
#12 pc 000000000010fe1a  /data/app/~~ETEnF5_f0w4xMzEwHj2CkA==/com.brother.ptouch.sdk.printdemo-C0gyqpilYkM-CwZTae0xFQ==/oat/arm64/base.vdex (b2.a.X+78)
#15 pc 00000000001777b4  /data/app/~~ETEnF5_f0w4xMzEwHj2CkA==/com.brother.ptouch.sdk.printdemo-C0gyqpilYkM-CwZTae0xFQ==/oat/arm64/base.vdex (q2.b.x+150)
#18 pc 00000000001846da  /data/app/~~ETEnF5_f0w4xMzEwHj2CkA==/com.brother.ptouch.sdk.printdemo-C0gyqpilYkM-CwZTae0xFQ==/oat/arm64/base.vdex (s0.p.g+308)
#21 pc 000000000010efde  /data/app/~~ETEnF5_f0w4xMzEwHj2CkA==/com.brother.ptouch.sdk.printdemo-C0gyqpilYkM-CwZTae0xFQ==/oat/arm64/base.vdex (b1.f.f+16)
#24 pc 0000000000191e20  /data/app/~~ETEnF5_f0w4xMzEwHj2CkA==/com.brother.ptouch.sdk.printdemo-C0gyqpilYkM-CwZTae0xFQ==/oat/arm64/base.vdex (x2.t.run+258)
#27 pc 00000000001535f8  /data/app/~~ETEnF5_f0w4xMzEwHj2CkA==/com.brother.ptouch.sdk.printdemo-C0gyqpilYkM-CwZTae0xFQ==/oat/arm64/base.vdex (kotlinx.coroutines.scheduling.a.run+152)

I tried adding the following rules to the proguard-rules.pro file:

-keep class com.brother.ptouch.sdk.JNIWrapper { *; }
-keep class com.brother.** { *; }
-keep class com.brother.ptouch.sdk.** { *; }

But the issue remains unresolved.

However, when using the same configuration with assembleDebug, it runs normally.

I've emailed the official technical support but haven't received any response yet.

Android Studio 2025.1.4
compileSdk = "36"
targetSdk = "34"
minSdk = "28"
agp = "8.13.0"
gradle = 8.13

[CodeMinion]

Hello @uiiang ,

Thanks for reaching out about this and apologies for the late response. From the looks of the error log the crash seems to be originating on the native C/C++ side of the Brother SDK. Based on your additional details my first guess would be it's related to the Android permissions.

Have you tried running that release version on older Android devices, and if so what version of Android where they running and what was the outcome?

Thanks in advance,

[uiiang]

Hello @uiiang ,

Thanks for reaching out about this and apologies for the late response. From the looks of the error log the crash seems to be originating on the native C/C++ side of the Brother SDK. Based on your additional details my first guess would be it's related to the Android permissions.

Have you tried running that release version on older Android devices, and if so what version of Android where they running and what was the outcome?

Thanks in advance,

Thank you very much for your idea. I tried running the APK on an Android 7.x device, and the program did not crash.
Or modify the code
minSdk = 25
The program still didn't crash, on an Android 10.x,12.x device.
But if the minSdk is set to 26 or higher, the program crashes.