Android onLeScan函数在尝试检测可扩展设备时未调用
我正在尝试检测服务上附近的蓝牙低能设备。 当服务启动时,调用startedscan(),然后在10秒后调用stopLeScan()。 尽管startedscan()返回true,并且我没有得到任何错误,但是lescallback上的onLeScan没有被调用。 服务:Android onLeScan函数在尝试检测可扩展设备时未调用,android,android-service,bluetooth-lowenergy,Android,Android Service,Bluetooth Lowenergy,我正在尝试检测服务上附近的蓝牙低能设备。 当服务启动时,调用startedscan(),然后在10秒后调用stopLeScan()。 尽管startedscan()返回true,并且我没有得到任何错误,但是lescallback上的onLeScan没有被调用。 服务: . . . // Device scan callback. private BluetoothAdapter.LeScanCallback mLeScanCallb
.
.
.
// Device scan callback.
private BluetoothAdapter.LeScanCallback mLeScanCallback =
new BluetoothAdapter.LeScanCallback() {
public void onLeScan(final BluetoothDevice device, final int rssi, final byte[] scanRecord) {
Log.i(TAG, "New LE Device: " + device.getName() + " @ " + rssi);
if (DEVICE_NAME.equals(device.getName()) && deviceAddress.equals(device.getAddress())) {
mDevice = device;
BleScan(false);
connectBluetoothDevice();
}
}
};
/**
* Starts and stops Bluetooth LE scanning for BLE devices.
*
* @param enable true to start scanning, false to stop scanning.
*/
public void scanLeDevice(final boolean enable) {
if (enable) {
// Stops scanning after a pre-defined scan period.
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
if (mScanning) {
BleScan(false);
}
}
}, SCAN_PERIOD);
BleScan(true);
} else {
BleScan(false);
}
}
/**
* @param scan true to scan, and false to stop scanning for Bluetooth LE devices.
*/
private void BleScan(boolean scan) {
if (scan) {
mScanning = true;
boolean temp = mBluetoothAdapter.startLeScan(mLeScanCallback);
Log.i(TAG, "Started LE scan: " + temp);
} else {
mScanning = false;
mBluetoothAdapter.stopLeScan(mLeScanCallback);
}
}
我尝试使用BluetoothLeScannerstartScan()和stopScan(),并改用ScanCallback,但没有任何帮助:
ScanCallback mScanCallback = new ScanCallback() {
@Override
public void onScanResult(int callbackType, ScanResult result) {
Log.i(TAG, "New LE Device: " + result.getDevice().getName() + " @ " + result.getRssi());
}
@Override
public void onScanFailed(int errorCode) {
Log.i(TAG, "Scan Faild!!");
}
};
/**
* Starts and stops Bluetooth LE scanning for BLE devices.
*
* @param enable true to start scanning, false to stop scanning.
*/
public void scanLeDevice(final boolean enable) {
if (enable) {
// Stops scanning after a pre-defined scan period.
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
if (mScanning) {
BleScan(false);
}
}
}, SCAN_PERIOD);
BleScan(true);
} else {
BleScan(false);
}
}
/**
* @param scan true to scan, and false to stop scanning for Bluetooth LE devices.
*/
private void BleScan(boolean scan) {
if (scan) {
mScanning = true;
mBluetoothLeScanner.startScan(mScanCallback);
Log.i(TAG, "Started LE scan");
} else {
mScanning = false;
mBluetoothLeScanner.stopScan(mScanCallback);
}
}
( uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" )
有人说需要打开GPS,所以我打开了GPS。
我试着重新启动android设备。
另一个BLE检测应用程序可以看到BLE设备
为什么不调用扫描回调
编辑
我在运行安卓6.0.1的Nexus5设备上运行这个应用程序 我尝试添加位置权限,但没有帮助:
ScanCallback mScanCallback = new ScanCallback() {
@Override
public void onScanResult(int callbackType, ScanResult result) {
Log.i(TAG, "New LE Device: " + result.getDevice().getName() + " @ " + result.getRssi());
}
@Override
public void onScanFailed(int errorCode) {
Log.i(TAG, "Scan Faild!!");
}
};
/**
* Starts and stops Bluetooth LE scanning for BLE devices.
*
* @param enable true to start scanning, false to stop scanning.
*/
public void scanLeDevice(final boolean enable) {
if (enable) {
// Stops scanning after a pre-defined scan period.
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
if (mScanning) {
BleScan(false);
}
}
}, SCAN_PERIOD);
BleScan(true);
} else {
BleScan(false);
}
}
/**
* @param scan true to scan, and false to stop scanning for Bluetooth LE devices.
*/
private void BleScan(boolean scan) {
if (scan) {
mScanning = true;
mBluetoothLeScanner.startScan(mScanCallback);
Log.i(TAG, "Started LE scan");
} else {
mScanning = false;
mBluetoothLeScanner.stopScan(mScanCallback);
}
}
( uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" )
我也有类似的问题。
同样的代码,一个平板电脑不能工作,但另一个可以。
我没有解决方案,但当我重置平板电脑并重新安装apk时,它可以再次正常工作
我找到了这个
当我打开gps时,它工作了…尝试打开应用程序设置(设置->应用程序->你的应用程序->规则->位置数据)中的位置数据访问功能。谷歌文档的后续操作: 1.将这些行添加到清单中
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<!-- Required only if your app isn't using the Device Companion Manager. -->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
你能告诉我们,你使用的是哪款手机和安卓版本吗?Android 6需要位置权限才能获得扫描结果。我正在运行Android 6.0.1的nexus 5设备上运行此应用程序。我尝试添加位置权限,但没有任何帮助。@AmitaiFensterheim您的目标SDK是什么?如果您的目标是>=23,您也必须在运行时明确请求权限。只需添加到SJoshis注释中,请看一下,这将解释如何请求适当的权限谢谢!它起作用了!为什么蓝牙LE需要位置许可?我应该使用哪种BLE扫描功能,startScan还是startScan?