New target API requirement from Google

https://developer.android.com/google/play/requirements/target-sdk

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android {
    compileSdkVersion 33
    buildToolsVersion "33.0.2"
    ...
}

android:exported

https://developer.android.com/about/versions/12/behavior-changes-12
For Android 12 or higher, set “android:exported” attribute to “true” in the launch activity.

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<activity android:name=".activity.SplashActivity" android:exported="true">

New bluetooth permissions from Google

https://developer.android.com/guide/topics/connectivity/bluetooth/permissions
For Android 12 lower, ACCESS_FINE_LOCATION & ACCESS_COARSE_LOCATION is required.

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<manifest>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

    ...
</manifest>

For Android 12 or higher, add the new permissions below.

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<manifest>
    <uses-permission android:name="android.permission.BLUETOOTH"
                     android:maxSdkVersion="30" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"
                     android:maxSdkVersion="30" />

    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" />
    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />

    ...
</manifest>

Request for the BLE related permissions
https://developer.android.com/training/permissions/requesting

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if (Build.VERSION.SDK_INT < 31) {
    requestPermissions(arrayOf(Manifest.permission.ACCESS_COARSE_LOCATION,
                                Manifest.permission.ACCESS_FINE_LOCATION),
                        2)
}else{
    requestPermissions(arrayOf(Manifest.permission.BLUETOOTH_CONNECT,
                                Manifest.permission.BLUETOOTH_SCAN,
                                Manifest.permission.BLUETOOTH_ADVERTISE),
                        2)
}

Update DFU lib to the latest version

  • DFU lib to the latest version
    Was using the 1.11.0 and crashed when running on Android 12 phone.
    Solution: Update the Nordic DFU lib to the latest version (current 2.3.0)
    https://github.com/NordicSemiconductor/Android-DFU-Library

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    dependencies {
        
        implementation 'no.nordicsemi.android:dfu:2.3.0'
        ...
    }

  • Kotlin version to 1.7.20
    Was using the ext.kotlin_version = “1.4.32” and got build error after updating the DFU lib to 2.3.0.
    Solution: 

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    buildscript {
        ext.kotlin_version = "1.7.20"
        ...
    }

  • Add foreground service permission to the project’s AndroidManifest.xml
    Android foreground service:
    https://developer.android.com/guide/components/foreground-services

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    <uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>