自从我从 1.5.2 升级到 1.32.8 以来，蓝色颤动加上没有扫描结果

问题描述 投票：0回答：1
我的应用程序在 1.5.2 中运行良好，可获取附近的所有 BLE 设备。

自从升级后，

我没有得到扫描结果。 （此升级是强制性的，因为按照 Google 的要求，在 2024 年 8 月之前针对 Android 14 时 1.5.2 会崩溃）。

查看日志，听起来

turnOn()

 可能是问题所在。

（我的主要平台是Android，所以问题与Android版本有关，我还没有尝试在iOS上升级）。

我听开/关状态：

// handle bluetooth on & off // note: for iOS the initial state is typically BluetoothAdapterState.unknown // note: if you have permissions issues you will get stuck at BluetoothAdapterState.unauthorized // _bluetoothOnOffStreamSubscription?.cancel(); _bluetoothOnOffStreamSubscription ??= FlutterBluePlus.adapterState.listen((BluetoothAdapterState state) { debugPrint("Bluetooth is: $state"); if (state == BluetoothAdapterState.on) { // usually start scanning, connecting, etc } else { // show an error to the user, etc } }); // == Add read values listeners _scanResultsStreamSubscription ??= FlutterBluePlus.scanResults.listen( (List<ScanResult> results) { debugPrint('Scanning devices nearby: found ${results.length}'); if (!mounted) return; // == Add source devices to the list for (ScanResult result in results) { debugPrint( 'Device [${result.device.name}] found nearby! rssi: ${result.rssi}'); _addDeviceTolist(result); } if (results.length > 0) if (mounted) setState(() { // Force the refresh scanResultsCount += results.length; }); }, onError: (e) => print(e), ); // turn on bluetooth ourself if we can // for iOS, the user controls bluetooth enable/disable if (Platform.isAndroid) { await FlutterBluePlus.turnOn(); } FlutterBluePlus.startScan( // androidScanMode: AndroidScanMode.lowLatency, timeout: duration, ).catchError((e) { debugPrint("startScan exception: $e"); }); 
正如我所见，首先我得到状态，但在 FBP 记录后，turnOn 返回 false：


D/[FBP-Android](14379): [FBP] onMethodCall: turnOn
I/flutter (14379): Bluetooth is: BluetoothAdapterState.on
I/flutter (14379): [FBP] <turnOn> result: false

有什么想法吗？


完整日志：


I/flutter (14379): Location permission is granted
I/flutter (14379): Read the information 1.3.16
I/flutter (14379): Geolocator status: inital value for _isLocationEnabled is true
I/flutter (14379): WiFi scanner: CanGetScannedResults.yes
I/flutter (14379): [FBP] <setLogLevel> result: true
I/flutter (14379): [FBP] <isSupported> args: null
D/[FBP-Android](14379): [FBP] onMethodCall: isSupported
I/flutter (14379): Location when in use permission is granted
I/flutter (14379): [FBP] <isSupported> result: true
I/flutter (14379): [FBP] <getAdapterState> args: null
D/[FBP-Android](14379): [FBP] onMethodCall: getAdapterState
I/flutter (14379): [FBP] <getAdapterState> result: {adapter_state: 4}
I/flutter (14379): [FBP] <turnOn> args: null
D/[FBP-Android](14379): [FBP] onMethodCall: turnOn
I/flutter (14379): Bluetooth is: BluetoothAdapterState.on
I/flutter (14379): [FBP] <turnOn> result: false
I/flutter (14379): Geolocator status: subscribing to stream
I/flutter (14379): Reading package information…
I/flutter (14379): [FBP] <setLogLevel> args: 5
I/flutter (14379): Read the information 1.3.16
D/[FBP-Android](14379): [FBP] onMethodCall: setLogLevel
I/flutter (14379): Start scanning ble devices nearby…
I/flutter (14379): SCANNING: false
I/flutter (14379): Location permission is granted
I/flutter (14379): Geolocator status: inital value for _isLocationEnabled is true
I/flutter (14379): [FBP] <setLogLevel> result: true
I/flutter (14379): [FBP] <isSupported> args: null
D/[FBP-Android](14379): [FBP] onMethodCall: isSupported
I/flutter (14379): Location when in use permission is granted
I/flutter (14379): [FBP] <isSupported> result: true
I/flutter (14379): [FBP] <turnOn> args: null
D/[FBP-Android](14379): [FBP] onMethodCall: turnOn
I/flutter (14379): Dispose (Geolocator status: )
I/flutter (14379): Stop scanning ble devices nearby
W/WindowOnBackDispatcher(14379): sendCancelIfRunning: isInProgress=falsecallback=io.flutter.embedding.android.FlutterActivity$1@c3801c4
I/flutter (14379): [FBP] stopScan: already stopped
I/flutter (14379): Done stopScan()
I/flutter (14379): [FBP] <turnOn> result: false
I/flutter (14379): [FBP] <turnOn> args: null
D/[FBP-Android](14379): [FBP] onMethodCall: turnOn
I/flutter (14379): isScanning: true
I/flutter (14379): [FBP] <turnOn> result: false
I/flutter (14379): [FBP] <startScan> args: {with_services: [], with_remote_ids: [], with_names: [], with_keywords: [], with_msd: [], with_service_data: [], continuous_updates: false, continuous_divisor: 1, android_scan_mode: 2, android_uses_fine_location: false}
D/[FBP-Android](14379): [FBP] onMethodCall: startScan
D/WifiScanPlugin(14379): onRequestPermissionsResult: arguments (1454, [Ljava.lang.String;@b45ef43, [I@c7f79c0)
D/WifiScanPlugin(14379): requestPermissionCookie: {}
I/flutter (14379): isScanning: false
I/flutter (14379): Scanning devices nearby: found 0
I/flutter (14379): [FBP] stopScan: already stopped

[更新]


我做了几件事：




    首先我像以前一样将targetSdkVersion降级到33，仍然没有扫描结果；
  1. 

    2. 仍然在 targetSdkVersion 33 中，我用 flutter_blue_plus 团队提供的演示应用程序替换了主应用程序小部件，并获得了相同的 0 扫描结果。
  2. 

    3. 

日志如下。


Connecting to VM Service at ws://127.0.0.1:49838/IV8Mmm-MLFw=/ws
D/[FBP-Android](11231): [FBP] onMethodCall: flutterRestart
D/[FBP-Android](11231): [FBP] initializing BluetoothAdapter
I/flutter (11231): [FBP] <setLogLevel> args: 5
D/[FBP-Android](11231): [FBP] disconnectAllDevices(flutterRestart)
D/[FBP-Android](11231): [FBP] connectedPeripherals: 0
D/[FBP-Android](11231): [FBP] onMethodCall: setLogLevel
I/flutter (11231): [FBP] <setLogLevel> result: true
I/flutter (11231): [FBP] <getAdapterState> args: null
D/[FBP-Android](11231): [FBP] onMethodCall: getAdapterState
I/flutter (11231): [FBP] <getAdapterState> result: {adapter_state: 4}
I/flutter (11231): [FBP] <getSystemDevices> args: null
D/[FBP-Android](11231): [FBP] onMethodCall: getSystemDevices
I/flutter (11231): [FBP] <getSystemDevices> result: {devices: []}
I/flutter (11231): [FBP] <startScan> args: {with_services: [], with_remote_ids: [], with_names: [], with_keywords: [], with_msd: [], with_service_data: [], continuous_updates: false, continuous_divisor: 1, android_scan_mode: 2, android_uses_fine_location: false}
D/[FBP-Android](11231): [FBP] onMethodCall: startScan
D/BluetoothAdapter(11231): isLeEnabled(): ON
D/BluetoothLeScanner(11231): onScannerRegistered() - status=0 scannerId=3 mScannerId=0
I/flutter (11231): [FBP] <startScan> result: true
I/flutter (11231): [FBP] <stopScan> args: null
D/[FBP-Android](11231): [FBP] onMethodCall: stopScan
D/BluetoothAdapter(11231): isLeEnabled(): ON
I/flutter (11231): [FBP] <stopScan> result: true

我的清单：


<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.olenpepsmobile">

    <!-- Enables BLE communications -->
         <!-- Request legacy Bluetooth permissions on older devices. -->
    <uses-permission android:name="android.permission.BLUETOOTH"
    android:maxSdkVersion="30" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"
        android:maxSdkVersion="30" />

    <!-- Needed only if your app looks for Bluetooth devices.
    If your app doesn't use Bluetooth scan results to derive physical
    location information, you can
    <a href="#assert-never-for-location">strongly assert that your app
    doesn't derive physical location</a>. -->
    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />

    <!-- Needed only if your app makes the device discoverable to Bluetooth
    devices. -->
    <!-- <uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" /> -->

    <!-- Needed only if your app communicates with already-paired Bluetooth
    devices. -->
    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />

    <!-- Needed only if your app uses Bluetooth scan results to derive physical location. -->
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <!-- <uses-permission android:name="android.permission.BLUETOOTH" />  
    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />   -->

    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>  
    <uses-permission android:name="android.permission.READ_INTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 

    <application
        android:label="Olenergies Batteries"
        android:name="${applicationName}"
        android:icon="@mipmap/ic_launcher"
        android:enableOnBackInvokedCallback="true"
        >
        <activity
            android:name=".MainActivity"
            android:exported="true"
            android:launchMode="singleTop"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize">
            <!-- Specifies an Android theme to apply to this Activity as soon as
                 the Android process has started. This theme is visible to the user
                 while the Flutter UI initializes. After that, this theme continues
                 to determine the Window background behind the Flutter UI. -->
            <meta-data
              android:name="io.flutter.embedding.android.NormalTheme"
              android:resource="@style/NormalTheme"
              />
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
        <!-- Don't delete the meta-data below.
             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
        <meta-data
            android:name="flutterEmbedding"
            android:value="2" />
    </application>
</manifest>

我的build.gradle：


def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
apply plugin: 'com.google.gms.google-services'


def keystoreProperties = new Properties()
   def keystorePropertiesFile = rootProject.file('key.properties')
   if (keystorePropertiesFile.exists()) {
       keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
   }

android {
    compileSdkVersion 33//34 //flutter.compileSdkVersion

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    kotlinOptions {
        jvmTarget = '1.8'
    }

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    defaultConfig {
        applicationId "com.olenergies.olenpepsmobile"
        minSdkVersion 21
        targetSdkVersion 34
        // Fix to 34 to comply with Google injonction by July 4th 2024
        // Fix to 33 to comply with Google injonction by August 31st 2023
        //31 // Fix to Android 12 to solve permission issue on Android 13 https://stackoverflow.com/questions/76092585/filepicker-missing-permission-on-android-13-pixel-7/76092681#76092681
        //flutter.targetSdkVersion
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    }

    signingConfigs {
        release {
            keyAlias keystoreProperties['keyAlias']
            keyPassword keystoreProperties['keyPassword']
            storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
            storePassword keystoreProperties['storePassword']
        }
    }
    buildTypes {
        release {
            signingConfig signingConfigs.release
            // Sdl on Thursday May 12th 2022: remove shriking to let flutter blue plus scan working
            //signingConfig signingConfigs.debug
            shrinkResources false
            minifyEnabled false
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'com.android.support:multidex:1.0.3'
}

    

	


flutter

bluetooth-lowenergy


1个回答




    
    
    

        

            

                

                    
0
投票

                    
                

            

        

        
我终于成功地通过在 
targetSdkVersion
 中对齐 
compileSdkVersion
 和 
build.gradle
 的版本来使其工作。

    

	

    

    


  

  

    
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