Scanning of Bluetooth Low Energy Fails

问题:

I am currently developing an application that will use Bluetooth Low Energy.

I am using the following link,

http://developer.android.com/samples/BluetoothLeGatt/src/com.example.android.bluetoothlegatt/DeviceScanActivity.html

I am not able to scan the surrounding BLE devices.

To scan device,

mBluetoothAdapter.startLeScan(mLeScanCallback); 

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

        @Override
        public void onLeScan(final BluetoothDevice device, int rssi,byte[] scanRecord) 
        {

            runOnUiThread(new Runnable() {
                @Override
                public void run() 
                {

                    mLeDeviceListAdapter.addDevice(device);

                    mLeDeviceListAdapter.notifyDataSetChanged();

                }
            });
        }
    };

回答1:

I had the same problem please add these permissions to your manifest

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

回答2:

If You are using 23 API or higher: You have to add location permission

These all permissions in manifest:

  <uses-feature
    android:name="android.hardware.bluetooth_le"
    android:required="true" />

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />