如何仅扫描附近的BLE设备

Question

我正在尝试扫描附近的BLE设备，其中我的设备为MOTO E phone，而我附近的BLE设备为CSR 8670 dev Kit，还有NOKIA 525和MOTO G.但它甚至没有扫描任何设备这些设备兼容BLE。我使用以下链接作为扫描我的BLE设备的参考： -

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

清单

<?xml version="1.0" encoding="UTF-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.android.bluetoothlegatt"
    android:versionCode="1"
    android:versionName="1.0">

    <uses-sdk android:minSdkVersion="18"
        android:targetSdkVersion="18"/>

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

    <application android:label="@string/app_name"
        android:icon="@drawable/ic_launcher"
        android:theme="@android:style/Theme.Holo.Light">
        <activity android:name=".DeviceScanActivity"
            android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
        <activity android:name=".DeviceControlActivity"/>
        <service android:name=".BluetoothLeService" android:enabled="true"/>
    </application>

</manifest>

扫描设备

private void scanLeDevice(final boolean enable)
    {
     if (enable) 
    {
      // Stops scanning after a pre-defined scan period.
            mHandler.postDelayed(new Runnable() {
                @Override
                public void run() {
                    mScanning = false;
                    mBluetoothAdapter.stopLeScan(mLeScanCallback);
                    invalidateOptionsMenu();
                }
            }, SCAN_PERIOD);

            mScanning = true;
            mBluetoothAdapter.startLeScan(mLeScanCallback);
        } else {
            mScanning = false;
            mBluetoothAdapter.stopLeScan(mLeScanCallback);
        }
        invalidateOptionsMenu();
    }