英文:
Changing target SDK from 28 to 29 results in BLE scan not working
问题
我正在开发一个需要连接到BLE设备的Android应用程序。
应用程序按预期工作，但是现在当我将目标SDK更改为29（之前是API 28）时，应用程序不再获取任何扫描结果。
在API级别28上，当应用程序启动时，我检查权限。如果没有被授予，我会请求权限，然后像往常一样开始扫描BLE设备。然后我会获得包括周围BLE设备的扫描结果。我通过打印日志消息确认这一点。
现在当我将目标SDK更改为29（这是Play Store更新应用程序所需的）时，应用程序停止获取扫描结果。日志中也没有任何消息。
在API 28上工作但在API 29上不工作的设备：搭载Android 10的三星S10。
我在清单中添加的权限：
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<!-- 如果您的应用程序针对Android 9或更低版本，请改为声明ACCESS_COARSE_LOCATION。 -->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />
我在运行时从用户那里请求的权限：
if(ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_COARSE_LOCATION)
!= PackageManager.PERMISSION_GRANTED){
// 这里是向用户请求权限的代码。
ActivityCompat.requestPermissions(MainActivity.this,
new String[] { Manifest.permission.ACCESS_COARSE_LOCATION },
REQUEST_ENABLE_LOCATION);
}
我处理扫描结果的代码：
public void onScanResult(int callbackType, ScanResult result) {
BluetoothDevice device = result.getDevice();
String deviceName = device.getName();
if (deviceName != null) {
if (checkdevicename(deviceName)){
Log.d(TAG, "Connect:" + deviceName);
isConnected = true;
mDevice = device;
// 连接到设备，建立GATT连接。
device.connectGatt(ma, false, mGattCallback);
stopScan();
} else {
Log.d(TAG, "DEVICE NAME =====>" + deviceName);
}
}
}
英文:
I am working on Android app which need to be connected to BLE devices.
The app works as expected but now when I changes the target SDK to 29 (which was previously API 28) the app stops getting any scan results.
At API level 28 when the app starts I check the permission. If not granted I ask for it and then start scanning as usual for BLE devices. Then I get the scan results which include the BLE devices around me. I confirm that by printing log messages.
Now when I changed the target SDK to 29 (which is required by play store to update the app) the app stops getting scan results. I am not getting messages in the logs either.
Device which is working with API 28 and not with API 29: Samsung S10 with Android 10.
Permissions I added in the manifest
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<!-- If your app targets Android 9 or lower, you can declare
ACCESS_COARSE_LOCATION instead. -->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />
Permission I request from user at runtime:
if(ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_COARSE_LOCATION)
!= PackageManager.PERMISSION_GRANTED){
//here code for asking permission from user.
ActivityCompat.requestPermissions(MainActivity.this,
new String[] { Manifest.permission.ACCESS_COARSE_LOCATION },
REQUEST_ENABLE_LOCATION);
}
The code where I interact with scan results:
public void onScanResult(int callbackType, ScanResult result) {
BluetoothDevice device = result.getDevice();
String deviceName = device.getName();
if (deviceName != null) {
if (checkdevicename(deviceName)){
Log.d(TAG, "Connect:" + deviceName);
isConnected = true;
mDevice = device;
// // connecting to device. establishing gatt connection.
device.connectGatt(ma,false,mGattCallback);
stopScan();
} else {
Log.d(TAG,"DEVICE NAME =====>"+deviceName);
}
// super.onScanResult(callbackType, result);
}}
答案1
得分: 4
似乎在SDK 29中，隐私设置更加严格：https://developer.android.com/about/versions/10/privacy/changes，用于使用BLE（低功耗蓝牙）。
因此，基于这个知识，您可能需要更新您的权限，请参阅https://stackoverflow.com/questions/25884129/scanning-of-bluetooth-low-energy-fails。
简而言之（根据29版本的隐私更改），您需要使用ACCESS_FINE_LOCATION权限来使用某些蓝牙功能（以及WiFi和一些其他功能）。
一些电话、蓝牙、Wi-Fi API需要FINE位置权限。
如果您的应用目标是Android 10或更高版本，则必须具备ACCESS_FINE_LOCATION权限，以便使用Wi-Fi、Wi-Fi Aware或蓝牙API中的多种方法。
英文:
It seems the privacy settings got more strict in SDK 29: https://developer.android.com/about/versions/10/privacy/changes for using BLE (Bluetooth Low Energy).
So with that knowledge you might need to update your permissions, see https://stackoverflow.com/questions/25884129/scanning-of-bluetooth-low-energy-fails as well.
In a nutshell (according to the privacy version changes in 29) you need to use ACCESS_FINE_LOCATION permission to use certain Bluetooth functions (and also WiFi and some more).
> Some telephony, Bluetooth, Wi-Fi APIs require FINE location permission
If your app targets Android 10 or higher, it must have the ACCESS_FINE_LOCATION permission in order to use several methods within the Wi-Fi, Wi-Fi Aware, or Bluetooth APIs.
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