android app freeze @ manager.adapters().await? - minimal android app example available?

[m0rph3usX]

Hi there, I am new to android apps compiled in rust, so perphaps it's a really silly question, but I didn't get any idea why the app freezes when calling manager.adapters().await?.
I believe it has to do something with missing android permissions, but I am not really sure.
I've granted all permissions in the android app settings:

"Location"
"Nearby devices"
"Notifications"
"Sensors"

Describe the bug
Compiling and starting android app -> the app hangs when calling following function:
manager.adapters().await? So my last log entry is "call....0" here's my code:

debug!("call...");
getAllPermissions(); 
debug!("call...0");
let manager = Manager::new().await?;
debug!("call...1");
let adapters = manager.adapters().await?; // <<<<< app hangs here
debug!("call...2");
let central = adapters.into_iter().nth(0).unwrap();
debug!("call...3");

Expected behavior
Progess this function and view available BLE devices.

Actual behavior

App freezes on :
let adapters = manager.adapters().await?

My android manifest.xml:

<?xml version="1.0" encoding="UTF-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.nonpolynomial.btleplug.android">
 <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
 <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
 <uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS"/>
 <uses-permission android:name="android.permission.BLUETOOTH"/>
 <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
 <uses-permission android:name="android.permission.BLUETOOTH_SCAN"/>
 <uses-permission android:name="android.permission.BLUETOOTH_CONNECT"/>
</manifest>

I request permissions at runtime - I use this code here (not the best but I think it is working)

use jni::objects::{JObject, JValue};
use jni::{JNIEnv, JavaVM};
use ndk_context;

use once_cell::sync::OnceCell;

pub static JAVAVM: OnceCell<JavaVM> = OnceCell::new();

pub fn get_vm() -> JavaVM{
 unsafe{JavaVM::from_raw(ndk_context::android_context().vm().cast()).unwrap() }
}

fn get_activity_ptr() -> jni::sys::jobject{
 ndk_context::android_context().context().cast()
}

fn has_permissions(env: &JNIEnv, permissions: &[&str]) -> bool{
 for &permission in permissions{
 let perm_jstring = env.new_string(permission).unwrap();
 let perm_obj: JObject = perm_jstring.into();
 // Nutze das Activity-Objekt direkt im Methodenaufruf!
 let permission_status = env
 .call_method(
 unsafe{JObject::from(get_activity_ptr()) },
 "checkSelfPermission",
 "(Ljava/lang/String;)I",
 &[JValue::Object(perm_obj)],
 )
 .unwrap()
 .i()
 .unwrap();

 if permission_status != 0{
 // debug!("{} not granted", permissions.join(", "));
 return false;
 }
 }
 // debug!("{} granted", permissions.join(", "));
 true
}

fn request_permissions(env: &JNIEnv, permissions: &[&str]){
 debug!("request_permission{}", permissions.join(", "));
 
 let string_class = env.find_class("java/lang/String").unwrap();
 let default_string = env.new_string("").unwrap();
 let permissions_array = env.new_object_array(permissions.len() as i32, string_class, default_string).unwrap();

 for (i, &permission) in permissions.iter().enumerate(){
 let java_permission = env.new_string(permission).unwrap();
 env.set_object_array_element(permissions_array, i as i32, java_permission).unwrap();
 }

 env.call_method(
 unsafe{JObject::from(get_activity_ptr()) },
 "requestPermissions",
 "([Ljava/lang/String;I)V",
 &[
 JValue::Object(JObject::from(permissions_array)),
 JValue::Int(0),
 ],
 ).unwrap();

 debug!("request_permissions done");
}

pub fn ensure_permissions(env: &JNIEnv, permissions: &[&str]){
 debug!("ensure_permissions{}", permissions.join(", "));

 request_permissions(env, permissions);

 // if !has_permissions(env, permissions){
 // request_permissions(env, permissions);
 // } else{
 // debug!("{} already granted", permissions.join(", "));
 // }
}

pub fn getAllPermissions(){
 let vm = get_vm();
 let env = vm.attach_current_thread().unwrap();

 let permissions = [
 "android.permission.ACCESS_COARSE_LOCATION",
 "android.permission.ACCESS_FINE_LOCATION",
 "android.permission.BLUETOOTH",
 "android.permission.BLUETOOTH_ADMIN",
 "android.permission.BLUETOOTH_SCAN",
 "android.permission.BLUETOOTH_CONNECT",
 ];

 for perm in &permissions{
 ensure_permissions(&env, &[perm]);
 }
}

#[no_mangle]
pub extern "C" fn JNI_OnLoad(vm: jni::JavaVM, _res: *const std::os::raw::c_void) -> jni::sys::jint{
 let env = vm.get_env().unwrap();
 // jni_utils::init(&env).unwrap(); // ggf. entfernen, wenn nicht kompatibel
 // btleplug::platform::init(&env).unwrap(); // Nur falls du btleplug verwendest und es kompatibel ist!
 let _ = JAVAVM.set(vm);
 jni::JNIVersion::V6.into()
}

Additional context
my TOML:

[package]
name = "slint-rust-template"
version = "0.1.0"
edition = "2021"

# android -->
[lib]
crate-type = ["cdylib"]

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
slint ={version = "1.8.2", features = ["backend-android-activity-06"] }
anyhow = "1.0.98"
btleplug = "0.11.8"

futures = "0.3.31"
futures-util = "0.3.31"
tokio ={version = "1.12", features = ["full"] }
tokio-stream = "0.1.17"
uuid = "1.17.0"
once_cell = "1"
chrono = "0.4.41"
strum = "0.27.1"
strum_macros = "0.27.1"
#jni = "0.21.1"
jni = "0.19.0"
android-activity = "0.6.0"
ndk-context = "0.1.1"

#ndk-glue = "0.7.0"
#ndk = "0.9.0"
#ndk = "0.8"
ndk-glue = "0.7"

android_logger = "0.13"
log = "0.4"
android-manifest = "0.2.0"
#simplersble = "0.10.3"
#android-manifest = "0.2.0"
#jni-utils = "0.1.1"


[build-dependencies]
slint-build = "1.8.2"


[package.metadata.android]
# Specifies the package property of the manifest.
package = "com.foo.bar"

# Specifies the array of targets to build for.
build_targets = [ "armv7-linux-androideabi", "aarch64-linux-android", "i686-linux-android", "x86_64-linux-android" ]

# Path to your application's resources folder.
# If not specified, resources will not be included in the APK.
#resources = "path/to/resources_folder"

# Path to the folder containing your application's assets.
# If not specified, assets will not be included in the APK.
#assets = "path/to/assets_folder"

# Name for final APK file.
# Defaults to package name.
apk_name = "myapp"



# See https://developer.android.com/guide/topics/manifest/uses-sdk-element
#
# Defaults to a `min_sdk_version` of 23 and `target_sdk_version` of 30 (or lower if the detected NDK doesn't support this).
[package.metadata.android.sdk]
min_sdk_version = 23
target_sdk_version = 30
max_sdk_version = 29

# See https://developer.android.com/guide/topics/manifest/uses-feature-element
#
# Note: there can be multiple .uses_feature entries.
[[package.metadata.android.uses_feature]]
name = "android.hardware.vulkan.level"
required = true
version = 1

# See https://developer.android.com/guide/topics/manifest/uses-permission-element
#
# Note: there can be multiple .uses_permission entries.
[[package.metadata.android.uses_permission]]
name = "android.permission.ACCESS_COARSE_LOCATION"

[[package.metadata.android.uses_permission]]
name = "android.permission.ACCESS_FINE_LOCATION"
max_sdk_version = 30

[[package.metadata.android.uses_permission]]
name = "android.permission.ACCESS_LOCATION_EXTRA_COMMANDS"

[[package.metadata.android.uses_permission]]
name = "android.permission.BLUETOOTH"
max_sdk_version = 30

[[package.metadata.android.uses_permission]]
name = "android.permission.BLUETOOTH_ADMIN"
max_sdk_version = 30

[[package.metadata.android.uses_permission]]
name = "android.permission.BLUETOOTH_CONNECT"

[[package.metadata.android.uses_permission]]
name = "android.permission.BLUETOOTH_SCAN"





# See https://developer.android.com/guide/topics/manifest/application-element
[package.metadata.android.application]

# See https://developer.android.com/guide/topics/manifest/application-element#debug
#
# Defaults to false.
debuggable = false

# Defaults to the compiled artifact's name.
label = "myApp"

# See https://developer.android.com/guide/topics/manifest/application-element#extractNativeLibs
extract_native_libs = true

# See https://developer.android.com/guide/topics/manifest/application-element#usesCleartextTraffic
uses_cleartext_traffic = true

# See https://developer.android.com/guide/topics/manifest/meta-data-element
#
# Note: there can be several .meta_data entries.
# Note: the `resource` attribute is currently not supported.
[[package.metadata.android.application.meta_data]]
name = "com.samsung.android.vr.application.mode"
value = "vr_only"

# See https://developer.android.com/guide/topics/manifest/activity-element
[package.metadata.android.application.activity]

# See https://developer.android.com/guide/topics/manifest/activity-element#config
#
# Defaults to "orientation|keyboardHidden|screenSize".
config_changes = "orientation"

# See https://developer.android.com/guide/topics/manifest/activity-element#label
#
# Defaults to the application's label.
label = "Activity Name"

# See https://developer.android.com/guide/topics/manifest/activity-element#lmode
#
# Defaults to "standard".
launch_mode = "singleTop"

# See https://developer.android.com/guide/topics/manifest/activity-element#screen
#
# Defaults to "unspecified".
#orientation = "landscape"

# See https://developer.android.com/guide/topics/manifest/activity-element#exported
#
# Unset by default, or true when targeting Android >= 31 (S and up).
exported = true

# See https://developer.android.com/guide/topics/manifest/activity-element#resizeableActivity
#
# Defaults to true on Android >= 24, no effect on earlier API levels
resizeable_activity = false

# See https://developer.android.com/guide/topics/manifest/activity-element#always
always_retain_task_state = true

# See https://developer.android.com/guide/topics/manifest/meta-data-element
#
# Note: there can be several .meta_data entries.
# Note: the `resource` attribute is currently not supported.
[[package.metadata.android.application.activity.meta_data]]
name = "com.oculus.vr.focusaware"
value = "true"

# See https://developer.android.com/guide/topics/manifest/intent-filter-element
#
# Note: there can be several .intent_filter entries.
[[package.metadata.android.application.activity.intent_filter]]
# See https://developer.android.com/guide/topics/manifest/action-element
actions = ["android.intent.action.VIEW", "android.intent.action.WEB_SEARCH"]
# See https://developer.android.com/guide/topics/manifest/category-element
categories = ["android.intent.category.DEFAULT", "android.intent.category.BROWSABLE"]



# Set up reverse port forwarding through `adb reverse`, meaning that if the
# Android device connects to `localhost` on port `1338` it will be routed to
# the host on port `1338` instead. Source and destination ports can differ,
# see the `adb` help page for possible configurations.
[package.metadata.android.reverse_port_forward]
"tcp:1338" = "tcp:1338"

[qdot]

Do you see anything in the adb logs when running this?

[m0rph3usX]

Ok good point!
I already looked at logcat but filtered view (only my package). Now with not filtered logcat view:

2025-12-22 22:19:48.372 17432-17527 RustStdoutStderr app_process64 I 
2025-12-22 22:19:48.372 17432-17527 RustStdoutStderr app_process64 I thread '<unnamed>' panicked at C:\Users\x\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\btleplug-0.11.8\src\droidplug\mod.rs:19:26:
2025-12-22 22:19:48.372 17432-17527 RustStdoutStderr app_process64 I Droidplug has not been initialized. Please initialize it with btleplug::platform::init().
2025-12-22 22:19:48.372 17432-17527 RustStdoutStderr app_process64 I note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

So it seems that the "JNI_OnLoad" and "btleplug::platform::init(&env)" is not called:

#[no_mangle]
pub extern "C" fn JNI_OnLoad(vm: jni::JavaVM, _res: *const std::os::raw::c_void) -> jni::sys::jint{
 debug!("JNI_OnLoad");
 // Env nur hier verwenden, Scope beenden vor set()
{
 let env = vm.get_env().unwrap();
 if let Err(e) = btleplug::platform::init(&env){
 eprintln!("btleplug init failed:{:?}", e);
 return jni::sys::JNI_ERR;
 }
 }
 
 let _ = JAVAVM.set(vm); // vm jetzt frei bewechbar
 jni::JNIVersion::V6.into()
}

I am running the build with:

cargo apk run --target aarch64-linux-android

So I thought the cargo apk will include this function and autoload it... seems not - my bad.

I know the android part is described here already, but I am not sure what to do next.
Would someone be kind to show me a more detailed step by step on how to get this working.

I am using slint and the GUI and other logic is working on android already.
I didn't get the step how to get this running together with gradle / java.

In my opinion the rust part is done, right?

Thanks in advance.

[m0rph3usX]

Ok I am trying now to build the btleplug, so I cloned the btleplug into my src folder:

.\src\btleplug

and tried to compile the library with:
\src\btleplug\droidplug\java>gradlew.bat build

but it seems the io.github.gedgygedgy.rust:jni-utils:0.1.1-SNAPSHOT is no longer available:

...\src\btleplug\droidplug\java>gradlew.bat build
WARNING:We recommend using a newer Android Gradle plugin to use compileSdk = 34

This Android Gradle plugin (7.4.2) was tested up to compileSdk = 33

This warning can be suppressed by adding
 android.suppressUnsupportedCompileSdk=34
to this project's gradle.properties

The build will continue, but you are strongly encouraged to update your project to
use a newer Android Gradle Plugin that has been tested with compileSdk = 34
> Task :generateDebugRFile FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':generateDebugRFile'.
> Could not resolve all files for configuration ':debugCompileClasspath'.
 > Could not find io.github.gedgygedgy.rust:jni-utils:0.1.1-SNAPSHOT.
 Required by:
 project :

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 19s
8 actionable tasks: 1 executed, 7 up-to-date

I tried to change build.grade as follows, as it it recommended here:
https://github.com/gedgygedgy/jni-utils-rs

dependencies{
 // implementation 'io.github.gedgygedgy.rust:jni-utils:0.1.1-SNAPSHOT'
 implementation 'io.github.gedgygedgy.rust:jni-utils:0.1.0'
 //implementation files('c:/Users/qdot/code/jni-utils-rs/java/build/libs/jni-utils-0.1.1-SNAPSHOT.jar')
}

But the same issue remains:

Could not find io.github.gedgygedgy.rust:jni-utils:0.1.0

My JAVA version is:

>>java --version
openjdk 11.0.29 2025-10-21
OpenJDK Runtime Environment Temurin-11.0.29+7 (build 11.0.29+7)
OpenJDK 64-Bit Server VM Temurin-11.0.29+7 (build 11.0.29+7, mixed mode)

Any newer JAVA version caused some incompatible file format errors...

Could someone confirm this issue?
Or am I on the complete wrong path?

[tternes]

Could someone confirm this issue?
Or am I on the complete wrong path?

I can confirm this - I had the same issue. I have some pending PRs to try and help make the Android build setup much easier.

I have submitted a PR to jni-utils-rs to address the issue for my needs. I think this will unblock you on this part.

You'll still need to deal with building the Java parts of btleplug. I've also packaged that up, but don't have a PR for btleplug yet since I was waiting for my jni-utils-rs PR to land.

I have the following entries in my project's gradle file:

dependencies{
...
 implementation "com.github.tternes:btleplug:adb7695"
 implementation "com.github.tternes:jni-utils-rs:14244d5"
...
}

[m0rph3usX]

@tternes : Hey thanks for your information and also the provided dependencies!

To get the gradle build finally running I also had to add maven{url 'https://jitpack.io' } as additional reposetory, on both files:
settings.gradle:

pluginManagement{
 repositories{
 google()
 mavenCentral()
 maven{url 'https://jitpack.io' }
 }
 plugins{
 id 'com.android.library' version '7.4.2'
 }
}



rootProject.name = 'droidplug'

and the build.gradle:

buildscript{
 repositories{
 google()
 mavenCentral()
 maven{url 'https://jitpack.io' }
 }
 dependencies{
 classpath 'com.android.tools.build:gradle:7.4.2'
 }
}


plugins{
 id 'com.android.library'
}


repositories{
 mavenLocal()
 google()
 mavenCentral()
 maven{url 'https://jitpack.io' }
}

android{
 compileSdkVersion 34

 defaultConfig{
 minSdkVersion 23
 versionCode 1
 versionName '0.7.3'
 }

 compileOptions{
 sourceCompatibility JavaVersion.VERSION_1_8
 targetCompatibility JavaVersion.VERSION_1_8
 }
}

dependencies{
 // implementation 'io.github.gedgygedgy.rust:jni-utils:0.1.1-SNAPSHOT'
 implementation "com.github.tternes:btleplug:adb7695"
 implementation "com.github.tternes:jni-utils-rs:14244d5"
 //implementation files('c:/Users/qdot/code/jni-utils-rs/java/build/libs/jni-utils-0.1.1-SNAPSHOT.jar')
}

Ok now I have the blteplug file compiled:
droidplug-debug.aar
droidplug-release.aar

Hm ok trying figuring out, what / how to do next steps...

[m0rph3usX]

Ok, figured it out, there is no need to use other repos...

If you just clone the linked repo from readme:
https://github.com/deviceplug/jni-utils-rs

then run:

cargo build
cd java
./gradlew build

will generate the "missing file":
jni-utils-rs\java\build\libs\jni-utils-0.1.1-SNAPSHOT.jar

Then adjust the build.gradle in btlefolder:
src\btleplug\droidplug\java\build.gradle

dependencies{
 // adjust the path here to just generated jar file -->
 implementation files('C:/Users/foo/src/jni-utils-rs/java/build/libs/jni-utils-0.1.1-SNAPSHOT.jar')
}

After that, the btleplug JAVA stuff also compiles.
So now I have the JNI and bleplug compiled, so I think I have to figure out how to get
cargo-ndk
to merge the stuff together...

[tternes]

To get the gradle build finally running I also had to add maven{url 'https://jitpack.io' } as additional reposetory, on both files:

Oops! Yeah, forgot to mention that part.

If you just clone the linked repo from readme:
https://github.com/deviceplug/jni-utils-rs

Yeah, that's what I'm hoping to avoid - you shouldn't need to clone and glue all this stuff together. In my case, I'm building this in a CI system and don't want all these hard-coded paths that need to be manually updated.

Hopefully I can get my other PRs posted and merged in the next few weeks. I know a lot of folks struggle with this since it's all pretty complicated.

Glad you got it working in your setup!

[m0rph3usX]

Ok in meantime I got a little bit further...

Meaning:

rust part:

1. I compile my rust + slint code to libslint_rust_template.so file: cargo ndk -t aarch64-linux-android build --release

android app part:

2. I copy this so file to my subfolder, called "android": `src/android/app/jniLibs/arm64-v8a/libslint_rust_template.so
3. My previous compilations (JAVA part) are stored in src/android/app/libs/
   and containing:

droidplug-debug.aar
droidplug-release.aar
jni-utils-0.1.1-SNAPSHOT.jar
jni-utils-0.1.1-SNAPSHOT-sources.jar
jni-utils-0.1.1-SNAPSHOT-javadoc.jar

To tell the JAVA part to load my rust stuff, I have my src/android/app/src/main/AndrodiManifest.xml:

<manifest xmlns:android="http://schemas.android.com/apk/res/android">
 <uses-permission android:name="android.permission.BLUETOOTH_SCAN" 
 android:usesPermissionFlags="neverForLocation" />
 <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
 <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
 <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
 <uses-permission android:name="android.permission.BLUETOOTH" />
 <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
 
 <application 
 android:label="BLE App"
 android:theme="@style/Theme.AppCompat.Light.NoActionBar">


 <activity
 android:name="android.app.NativeActivity"
 android:exported="true"
 android:label="BLE App"
 android:configChanges="orientation|keyboardHidden|screenSize"
 android:screenOrientation="portrait">
 <meta-data
 android:name="android.app.lib_name"
 android:value="slint_rust_template" />
 <intent-filter>
 <action android:name="android.intent.action.MAIN" />
 <category android:name="android.intent.category.LAUNCHER" />
 </intent-filter>
 </activity>

 </application>
</manifest>

BTW: With the AndrodiManifest.xml there is no need for a Mainactivity.kt file.
I've tested it, and my rust code was loaded successfully.

5. my /android/app/build.gradle

plugins{
 id "com.android.application"
 id "org.jetbrains.kotlin.android"
}

android{
 namespace "com.example.ble"
 compileSdk 34
 
 defaultConfig{
 applicationId "com.example.ble"
 minSdk 26
 targetSdk 34
 versionCode 1
 versionName "1.0"
 }
 
 buildTypes{
 release{
 signingConfig signingConfigs.debug
 shrinkResources true
 minifyEnabled true
 proguardFiles getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro"
 }
 debug{
 // Debug ohne ProGuard
 }
 }
 
 compileOptions{
 sourceCompatibility JavaVersion.VERSION_1_8
 targetCompatibility JavaVersion.VERSION_1_8
 }
 
 kotlinOptions{
 jvmTarget = "1.8"
 }

 sourceSets{
 main{
 jniLibs.srcDirs = ["jniLibs"]
 }
 }
}

repositories{
 flatDir{
 dirs "libs"
 }
}

dependencies{
 // implementation(name: "jni-utils-0.1.1-SNAPSHOT", ext: "jar")
 // implementation(name: "droidplug-debug", ext: "aar")
 implementation(name: "droidplug-release", ext: "aar") 
 implementation "androidx.appcompat:appcompat:1.6.1"
 implementation "androidx.core:core-ktx:1.12.0"
}

my /android/gradle.properties

android.useAndroidX=true
android.enableJetifier=true

my `/android/settings.gradle

pluginManagement{
 repositories{
 google()
 mavenCentral()
 gradlePluginPortal()
 }
}

plugins{
 id "com.android.application" version "8.2.0" apply false
 id "org.jetbrains.kotlin.android" version "1.9.10" apply false
}

dependencyResolutionManagement{
 repositoriesMode.set(RepositoriesMode.PREFER_SETTINGS)
 repositories{
 google()
 mavenCentral()
 flatDir{dirs "$rootDir/app/libs" }
 }
}

rootProject.name = "BLE App"
include ":app"

```








6) to build finally the apk, I run `/android/gradlew build`


7) In my rust code, I call btleplug::platform::init before doing any other things:


function to get JAVA VM
```
pub fn get_vm() -> JavaVM{
 unsafe{JavaVM::from_raw(ndk_context::android_context().vm().cast()).unwrap() }
}

function where I call the `btleplug::platform::init`

 let vm = get_vm();
 let mut env = vm.attach_current_thread().unwrap();

 log("initialize btle plug");

 let initResult = btleplug::platform::init(&env);

 match initResult{
 Ok(()) =>{
 log("btleplug init OK");
 }
 Err(e) =>{
 log("btleplug NOK!"); // <<< currently I get here
 }
 }

 log("initialize btleplug - done");
```


Now, finally when starting the app on my phone I get a crash. When I comment out `btleplug::platform::init(&env) then there is no crash. 

```

2026-01-01 20:56:16.397 26746-26746 ziparchive com.example.ble W Unable to open '/data/app/~~S8g4rrMEngZI5nQJ9OaSTg==/com.example.ble-LAwAvk_0FzH9FXxXh4-79Q==/base.dm': No such file or directory
2026-01-01 20:56:16.397 26746-26746 ziparchive com.example.ble W Unable to open '/data/app/~~S8g4rrMEngZI5nQJ9OaSTg==/com.example.ble-LAwAvk_0FzH9FXxXh4-79Q==/base.dm': No such file or directory
2026-01-01 20:56:16.470 26746-26746 nativeloader com.example.ble D Configuring clns-4 for other apk /data/app/~~S8g4rrMEngZI5nQJ9OaSTg==/com.example.ble-LAwAvk_0FzH9FXxXh4-79Q==/base.apk. target_sdk_version=34, uses_libraries=, library_path=/data/app/~~S8g4rrMEngZI5nQJ9OaSTg==/com.example.ble-LAwAvk_0FzH9FXxXh4-79Q==/lib/arm64:/data/app/~~S8g4rrMEngZI5nQJ9OaSTg==/com.example.ble-LAwAvk_0FzH9FXxXh4-79Q==/base.apk!/lib/arm64-v8a, permitted_path=/data:/mnt/expand:/data/user/0/com.example.ble
2026-01-01 20:56:16.486 26746-26746 GraphicsEnvironment com.example.ble V Currently set values for:
2026-01-01 20:56:16.486 26746-26746 GraphicsEnvironment com.example.ble V angle_gl_driver_selection_pkgs=[]
2026-01-01 20:56:16.486 26746-26746 GraphicsEnvironment com.example.ble V angle_gl_driver_selection_values=[]
2026-01-01 20:56:16.486 26746-26746 GraphicsEnvironment com.example.ble V Global.Settings values are invalid: number of packages: 0, number of values: 0
2026-01-01 20:56:16.486 26746-26746 GraphicsEnvironment com.example.ble V Updatable production driver is not supported on the device.
2026-01-01 20:56:16.502 26746-26746 Compatibil...geReporter com.example.ble D Compat change id reported: 279646685; UID 10240; state: DISABLED
2026-01-01 20:56:16.560 26746-26746 nativeloader com.example.ble D Load /data/app/~~S8g4rrMEngZI5nQJ9OaSTg==/com.example.ble-LAwAvk_0FzH9FXxXh4-79Q==/base.apk!/lib/arm64-v8a/libslint_rust_template.so using ns clns-4 from class loader (caller=<unknown>): ok
2026-01-01 20:56:16.566 26746-26776 RustStdoutStderr com.example.ble I [20:56:16.565] - initializebtle plug
2026-01-01 20:56:16.566 26746-26776 RustStdoutStderr com.example.ble I [20:56:16.566] - btleplug NOK!
2026-01-01 20:56:16.566 26746-26776 RustStdoutStderr com.example.ble I [20:56:16.566] - initialize btleplug - done
2026-01-01 20:56:16.570 26746-26777 com.example.ble com.example.ble A java_vm_ext.cc:599] JNI DETECTED ERROR IN APPLICATION: JNI GetObjectClass called with pending exception java.lang.ClassNotFoundException: Didn't find class "com.nonpolynomial.btleplug.android.impl.Adapter" on path: DexPathList[[directory "."],nativeLibraryDirectories=[/system/lib64, /system_ext/lib64, /system/lib64, /system_ext/lib64]]
 java_vm_ext.cc:599] at java.lang.Class dalvik.system.BaseDexClassLoader.findClass(java.lang.String) (BaseDexClassLoader.java:259)
 java_vm_ext.cc:599] at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String, boolean) (ClassLoader.java:637)
 java_vm_ext.cc:599] at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String) (ClassLoader.java:573)
 java_vm_ext.cc:599] 
 java_vm_ext.cc:599] in call to GetObjectClass
2026-01-01 20:56:16.679 26746-26777 com.example.ble com.example.ble A runtime.cc:708] Runtime aborting...
 runtime.cc:708] Dumping all threads without mutator lock held
 runtime.cc:708] All threads:
 runtime.cc:708] DALVIK THREADS (17):
 runtime.cc:708] "main" prio=10 tid=1 Native
 runtime.cc:708] | group="" sCount=1 u

2026-01-01 20:56:16.397 26746-26746 ziparchive com.example.ble W Unable to open '/data/app/~~S8g4rrMEngZI5nQJ9OaSTg==/com.example.ble-LAwAvk_0FzH9FXxXh4-79Q==/base.dm': No such file or directory
2026-01-01 20:56:16.397 26746-26746 ziparchive com.example.ble W Unable to open '/data/app/~~S8g4rrMEngZI5nQJ9OaSTg==/com.example.ble-LAwAvk_0FzH9FXxXh4-79Q==/base.dm': No such file or directory
2026-01-01 20:56:16.470 26746-26746 nativeloader com.example.ble D Configuring clns-4 for other apk /data/app/~~S8g4rrMEngZI5nQJ9OaSTg==/com.example.ble-LAwAvk_0FzH9FXxXh4-79Q==/base.apk. target_sdk_version=34, uses_libraries=, library_path=/data/app/~~S8g4rrMEngZI5nQJ9OaSTg==/com.example.ble-LAwAvk_0FzH9FXxXh4-79Q==/lib/arm64:/data/app/~~S8g4rrMEngZI5nQJ9OaSTg==/com.example.ble-LAwAvk_0FzH9FXxXh4-79Q==/base.apk!/lib/arm64-v8a, permitted_path=/data:/mnt/expand:/data/user/0/com.example.ble
2026-01-01 20:56:16.486 26746-26746 GraphicsEnvironment com.example.ble V Currently set values for:
2026-01-01 20:56:16.486 26746-26746 GraphicsEnvironment com.example.ble V angle_gl_driver_selection_pkgs=[]
2026-01-01 20:56:16.486 26746-26746 GraphicsEnvironment com.example.ble V angle_gl_driver_selection_values=[]
2026-01-01 20:56:16.486 26746-26746 GraphicsEnvironment com.example.ble V Global.Settings values are invalid: number of packages: 0, number of values: 0
2026-01-01 20:56:16.486 26746-26746 GraphicsEnvironment com.example.ble V Updatable production driver is not supported on the device.
2026-01-01 20:56:16.502 26746-26746 Compatibil...geReporter com.example.ble D Compat change id reported: 279646685; UID 10240; state: DISABLED
2026-01-01 20:56:16.560 26746-26746 nativeloader com.example.ble D Load /data/app/~~S8g4rrMEngZI5nQJ9OaSTg==/com.example.ble-LAwAvk_0FzH9FXxXh4-79Q==/base.apk!/lib/arm64-v8a/libslint_rust_template.so using ns clns-4 from class loader (caller=<unknown>): ok
2026-01-01 20:56:16.566 26746-26776 RustStdoutStderr com.example.ble I [20:56:16.565] - initializebtle plug
2026-01-01 20:56:16.566 26746-26776 RustStdoutStderr com.example.ble I [20:56:16.566] - btleplug NOK!
2026-01-01 20:56:16.566 26746-26776 RustStdoutStderr com.example.ble I [20:56:16.566] - initialize btleplug - done
2026-01-01 20:56:16.570 26746-26777 com.example.ble com.example.ble A java_vm_ext.cc:599] JNI DETECTED ERROR IN APPLICATION: JNI GetObjectClass called with pending exception java.lang.ClassNotFoundException: Didn't find class "com.nonpolynomial.btleplug.android.impl.Adapter" on path: DexPathList[[directory "."],nativeLibraryDirectories=[/system/lib64, /system_ext/lib64, /system/lib64, /system_ext/lib64]]
 java_vm_ext.cc:599] at java.lang.Class dalvik.system.BaseDexClassLoader.findClass(java.lang.String) (BaseDexClassLoader.java:259)
 java_vm_ext.cc:599] at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String, boolean) (ClassLoader.java:637)
 java_vm_ext.cc:599] at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String) (ClassLoader.java:573)
 java_vm_ext.cc:599] 
 java_vm_ext.cc:599] in call to GetObjectClass
2026-01-01 20:56:16.679 26746-26777 com.example.ble com.example.ble A runtime.cc:708] Runtime aborting...
 runtime.cc:708] Dumping all threads without mutator lock held
 runtime.cc:708] All threads:
 runtime.cc:708] DALVIK THREADS (17):
 runtime.cc:708] "main" prio=10 tid=1 Native
 runtime.cc:708] | group="" sCount=1 u

```

Any ideas what I am doing wrong?