BluetoothLeScanner on android 6.0.1 (ss s6 edge) cannot found device android >= 6.0.1

[trongkhanh]

Hi all,
this code for scanning BLE device:

if (mBluetoothLEScanner == null) {
// create bluetoothLE scanner if it is null
mBluetoothLEScanner = mBluetoothAdapter.getBluetoothLeScanner();
}
// start scan bluetooth
mBluetoothLEScanner.startScan(
null,
buildScanSettings(),
mProxyScanCallback);

private ScanSettings buildScanSettings() {
ScanSettings.Builder builder = new ScanSettings.Builder();
builder.setScanMode(ScanSettings.SCAN_MODE_LOW_POWER);
builder.setReportDelay(0);
return builder.build();
}

Setting:

I cannot found device android >= 6.0.1, but can scan other device

There are any problem?Thank you.

[philips77]

Hi, Since Marshmallow you have to request Location permission (fine or coarse) in order to scan for Bluetooth LE devices. This is a Runtime permission, so you have to ask user to allow.
Check out this link: https://developer.android.com/training/permissions/requesting

Bluetooth LE devices, like beacons, can reveal phone's location. That's why user needs to allow it. Also, on most devices the Location must be enabled in the phone.

[trongkhanh]

Thanks you for response, philips77. But in AndroidManifest file, i requested Location permission as following:
uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
uses-permission android:name="android.permission.BLUETOOTH" />
uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

But App only scan device android < 6.0.1, cannot scan device Sony Xperia Z3 android 6.0.1.

[philips77]

That's a Runtime permission. You have to request it from the app, not only in the manifest. Read the link i have above.