In leScanCallback device.getName() returns null on

问题:

Checked following post but not helpful on my case :

BluetoothDevice always returns null on getName()

My problem

I am developing an application that scans the nearby Bluetooth device and displays in the home screen.But on few devices(i.e moto G,samsung note2) the device name is null on leScanCallback.

My code

private BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback() {

    @Override
    public void onLeScan(final BluetoothDevice device, final int rssi,
                         byte[] scanRecord) {
       if (device.getName() != null){//<<- Here it null on few device
           //my process          
        }
  }
};

Note: I need to throw an alert if it return null but i can't do it inside the onlescan because the scanning continuously. Before that i need to throw alert to user based on the bluetooth version is it possible and why on few devices i wont get the device name ? Thanks in advance.

回答1:

The name field is not populated on the first detections of the advertisement because it comes from a separate ScanResponse packet, which does not arrive until later than the advertisement callback you get.

This means you must hold a reference to the BluetoothDevice object returned by the scan and wait a few seconds to see if the name is populated.