DeviceScanner.java

package com.example.bluetooth.le;

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;

public class DeviceScanner {
	/**
	 * @author Jongseok Choi
	 */
	public static final String MIO_DEVICE_NAME = "MIO GLOBAL LINK";
	public static final String MSG_KEY_DEVICE_NAME = "deviceName";
	public static final String MSG_KEY_DEVICE_ADDRESS = "deviceAddress";

	private BluetoothManager mBluetoothManager;
	private BluetoothAdapter mBluetoothAdapter;
	private boolean mScanning;
	private Handler mHandler;
	private Runnable scanningDelayChecker;
	private Handler scannerMsgHandler;

	// Stops scanning after 10 seconds.
	private static final long SCAN_PERIOD = 10000;

	public DeviceScanner(BluetoothManager bluetoothManager, Handler scannerMsgHandler){
		this.scannerMsgHandler = scannerMsgHandler;
		mBluetoothManager = bluetoothManager;
	}

	public BluetoothAdapter initialize() {
		mHandler = new Handler();
		mBluetoothAdapter = mBluetoothManager.getAdapter();
		return mBluetoothAdapter;
	}

	public boolean isScanning(){
		return mScanning;
	}

	/**
	 * @author Jongseok Choi
	 * @param device
	 */
	private void selectDevice(BluetoothDevice device){
		if(null == device)
			return;
		Message msg = Message.obtain();
		Bundle data = new Bundle();
		data.putString(MSG_KEY_DEVICE_NAME, device.getName());
		data.putString(MSG_KEY_DEVICE_ADDRESS, device.getAddress());
		msg.setData(data);
		scannerMsgHandler.sendMessage(msg);
	}

	public void close(){
		if (mScanning) {
			mBluetoothAdapter.stopLeScan(mLeScanCallback);
			mScanning = false;
			mHandler.removeCallbacks(scanningDelayChecker);
		}
	}

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

	// Device scan callback.
	private BluetoothAdapter.LeScanCallback mLeScanCallback =  new BluetoothAdapter.LeScanCallback() {
		@Override
		public void onLeScan(final BluetoothDevice device, int rssi, byte[] scanRecord) {
			if(null!=device && null!=device.getName()){
				if(device.getName().startsWith(MIO_DEVICE_NAME)){
					Log.i(null, "SCANNED " + device.getName() + " : " + device.getAddress());
					selectDevice(device);
				}
			}
		}
	};
}