S.Sathya Priya
Reputation: 480
How to Scan the BLE device in background service without library?
I am trying to connect BLE device with android application. I am getting the device name,Mac Address and rssi value in foreground. I dont know how to scan the device in background and get the details of that particular device like MAC address,rssi value.
Upvotes: 7
Views: 12912
Answers (2)
j.prashant
Reputation: 77
Use service to scan and connect ble devices when application is in background in android.
package com.example.tracker.service;
import android.app.Service;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattService;
import android.bluetooth.BluetoothManager;
import android.bluetooth.le.BluetoothLeScanner;
import android.bluetooth.le.ScanFilter;
import android.bluetooth.le.ScanSettings;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Handler;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.support.v4.widget.SwipeRefreshLayout;
import android.util.Log;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.SeekBar;
import android.widget.Toast;
import com.google.firebase.auth.FirebaseAuth;
import com.example.tracker.R;
import com.example.tracker.utils.SampleGattAttributes;
import com.example.tracker.utils.SharedPreferencesUtils;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.UUID;
import static com.example.tracker.constant.SharedFreferencesConstant.KEY_SP_MOBILE_NUMBER;
/**
* Created by Jprashant on 12/9/17.
*/
public class BackgroundService extends Service{
private int scanPeriod;
Context context;
String TAG="BackgroundService";
private BluetoothAdapter mBluetoothAdapter;
private boolean mScanning;
private Handler mHandler;
public String[] advDataTypes = new String[256];
ArrayList<BluetoothDevice> bluetoothDeviceArrayList=new ArrayList<>();
ArrayList<BluetoothDevice> bluetoothDeviceArrayListTwo=new ArrayList<>();
private static final int REQUEST_ENABLE_BT = 1;
// Stops scanning after 10 seconds.
private static final long SCAN_PERIOD = 10000;
/*Connect Ble Device*/
String deviceId;
public static String arrayDidOpnSec2;
BluetoothGattService gattService4;
public static ArrayList<BluetoothGattCharacteristic> lastCharacteristic;
// AlertDialog.Builder alertDialog;
private float avgRssi = 0.0f;
// private Dialog dialog;
private BluetoothLeService mBluetoothLeService;
private boolean mConnected = false;
private ArrayList<ArrayList<BluetoothGattCharacteristic>> mGattCharacteristics = new ArrayList();
//service and char uuid
private static final int TRACKER_ON_OFF = 2;
private static final UUID TRACER_TRIPPLE_PRESS_SERVICE=UUID.fromString("edfec62e-9910-0bac-5241-d8bda6932a2f");
private static final UUID TRACKER_TRIPPLE_PRESS_CHAR=UUID.fromString("772ae377-b3d2-4f8e-4042-5481d1e0098c");
private static final UUID IMMEDIATE_ALERT_UUID = UUID.fromString("00001802-0000-1000-8000-00805f9b34fb");
private static final UUID ALERT_LEVEL_UUID = UUID.fromString("00002a06-0000-1000-8000-00805f9b34fb");
private Button btnSMS;
public static String mDeviceName,mDeviceAddress,connectionStatus;
/*-------------------------------------------------------------------------------*/
public static final String PREFS_NAME = "PreferencesFile";
public int deviceCount = 0;
public String[] mData = new String[400];
private Handler mHandler1;
private ListView listItems;
/*--------for > 21--------------*/
private BluetoothLeScanner mLEScanner;
private ScanSettings settings;
private List<ScanFilter> filters;
private BluetoothGatt mGatt;
public BackgroundService() {
}
public BackgroundService(Context context) {
this.context = context;
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// getting systems default ringtone
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),"CALL YOUR METHOD",Toast.LENGTH_LONG).show();
mHandler = new Handler();
// Use this check to determine whether BLE is supported on the device. Then you can
// selectively disable BLE-related features.
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
Toast.makeText(context, R.string.ble_not_supported, Toast.LENGTH_SHORT).show();
}
// Initializes a Bluetooth adapter. For API level 18 and above, get a reference to
// BluetoothAdapter through BluetoothManager.
final BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
mBluetoothAdapter = bluetoothManager.getAdapter();
// Checks if Bluetooth is supported on the device.
if (mBluetoothAdapter == null) {
Toast.makeText(context, R.string.error_bluetooth_not_supported, Toast.LENGTH_SHORT).show();
return;
}
for (int i = 0; i < 256; i += REQUEST_ENABLE_BT) {
advDataTypes[i] = "Unknown Data Type";
}
advDataTypes[REQUEST_ENABLE_BT] = "Flags";
advDataTypes[2] = "Incomplete List of 16-bit Service Class UUIDs";
advDataTypes[3] = "Complete List of 16-bit Service Class UUIDs";
advDataTypes[4] = "Incomplete List of 32-bit Service Class UUIDs";
advDataTypes[5] = "Complete List of 32-bit Service Class UUIDs";
advDataTypes[6] = "Incomplete List of 128-bit Service Class UUIDs";
advDataTypes[7] = "Complete List of 128-bit Service Class UUIDs";
advDataTypes[8] = "Shortened Local Name";
advDataTypes[9] = "Complete Local Name";
advDataTypes[10] = "Tx Power Level";
advDataTypes[13] = "Class of LocalDevice";
advDataTypes[14] = "Simple Pairing Hash";
advDataTypes[15] = "Simple Pairing Randomizer R";
advDataTypes[16] = "LocalDevice ID";
advDataTypes[17] = "Security Manager Out of Band Flags";
advDataTypes[18] = "Slave Connection Interval Range";
advDataTypes[20] = "List of 16-bit Solicitaion UUIDs";
advDataTypes[21] = "List of 128-bit Solicitaion UUIDs";
advDataTypes[22] = "Service Data";
advDataTypes[23] = "Public Target Address";
advDataTypes[24] = "Random Target Address";
advDataTypes[25] = "Appearance";
advDataTypes[26] = "Advertising Interval";
advDataTypes[61] = "3D Information Data";
advDataTypes[255] = "Manufacturer Specific Data";
scanPeriod = getApplicationContext().getSharedPreferences(PREFS_NAME, 0).getInt("scan_interval", 6000);
scanTrackerDevices();
}
}, 10000);
return START_STICKY;
}
@Override
public void onDestroy() {
super.onDestroy();
}
public void scanTrackerDevices(){
Log.e(TAG,"scanTrackerDevices");
if (!mBluetoothAdapter.isEnabled()) {
if (!mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
}
}
scanLeDevice(true);
}
private void scanLeDevice(final boolean enable) {
bluetoothDeviceArrayList.clear();
if (enable) {
// Stops scanning after a pre-defined scan period.
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
mScanning = false;
mBluetoothAdapter.stopLeScan(mLeScanCallback);
int arraySize=bluetoothDeviceArrayListTwo.size();
Log.e(TAG,"bluetoothDeviceArrayListTwo Size in scan :"+arraySize);
for (int i=0;i<bluetoothDeviceArrayListTwo.size();i++){
BluetoothDevice bluetoothDevice=bluetoothDeviceArrayListTwo.get(i);
Log.e(TAG,"Device Name in scan :"+bluetoothDevice.getName());
Log.e(TAG,"Device Address in scan :"+bluetoothDevice.getAddress());
if (i==0){
mBluetoothLeService.connect(bluetoothDevice.getAddress());
}
}
}
}, scanPeriod);
mScanning = true;
mBluetoothAdapter.startLeScan(mLeScanCallback);
} else {
mScanning = false;
mBluetoothAdapter.stopLeScan(mLeScanCallback);
}
}
private BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback() {
public void onLeScan(final BluetoothDevice device, final int rssi, final byte[] scanRecord) {
String d = "";
String rd = "";
String h = "0123456789ABCDEF";
int ln = 0;
int i = 0;
while (i < scanRecord.length) {
int x = scanRecord[i] & 255;
rd = new StringBuilder(String.valueOf(rd)).append(h.substring(x / 16, (x / 16) + REQUEST_ENABLE_BT)).append(h.substring(x % 16, (x % 16) +REQUEST_ENABLE_BT)).toString();
if (i == ln) {
ln = (i + x) + REQUEST_ENABLE_BT;
if (x == 0) {
break;
}
d = new StringBuilder(String.valueOf(d)).append("\r\n Length: ").append(h.substring(x / 16, (x / 16) + REQUEST_ENABLE_BT)).append(h.substring(x % 16, (x % 16) +REQUEST_ENABLE_BT)).toString();
i += REQUEST_ENABLE_BT;
x = scanRecord[i] & 255;
d = new StringBuilder(String.valueOf(d)).append(", Type :").append(h.substring(x / 16, (x / 16) + REQUEST_ENABLE_BT)).append(h.substring(x % 16, (x % 16) + REQUEST_ENABLE_BT)).append(" = ").append(advDataTypes[x]).append(", Value: ").toString();
rd = new StringBuilder(String.valueOf(rd)).append(h.substring(x / 16, (x / 16) + REQUEST_ENABLE_BT)).append(h.substring(x % 16, (x % 16) + REQUEST_ENABLE_BT)).toString();
} else {
d = new StringBuilder(String.valueOf(d)).append(" ").append(h.substring(x / 16, (x / 16) + REQUEST_ENABLE_BT)).append(h.substring(x % 16, (x % 16) +REQUEST_ENABLE_BT)).toString();
}
i += REQUEST_ENABLE_BT;
}
Log.e(TAG,"UUID : "+device.getUuids());
String[] arrayDeviceName=String.valueOf(device.getName()).split(" ");
String deviceName0=arrayDeviceName[0];
bluetoothDeviceArrayListTwo.add(device);
}
};
/*-------------------Connect BLE---------------------------------------------*/
private Handler mHandler2;
public final BroadcastReceiver mGattUpdateReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent)
{
String action = intent.getAction();
if (BluetoothLeService.ACTION_GATT_CONNECTED.equals(action))
{
numberOfRssi = 0;
avgRssi = 0.0f;
mConnected = true;
updateConnectionState(R.string.connected);
mHandler2.postDelayed(startRssi, 300);
Log.e(TAG,"ACTION_GATT_CONNECTED");
}
else if (BluetoothLeService.ACTION_GATT_DISCONNECTED.equals(action)) {
mConnected = false;
updateConnectionState(R.string.disconnected);
Log.e(TAG,"ACTION_GATT_DISCONNECTED");
} else if (BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED.equals(action)) {
displayGattServicesForDimmer(mBluetoothLeService.getSupportedGattServices());// For dimmer
Log.e(TAG,"ACTION_GATT_SERVICES_DISCOVERED");
} else if (BluetoothLeService.ACTION_DATA_AVAILABLE.equals(action)) {
Log.e(TAG,"ACTION_DATA_AVAILABLE");
String unknownServiceString = context.getResources().getString(R.string.unknown_service);
displayDimmerData("<<" + SampleGattAttributes.lookup(intent.getStringExtra(BluetoothLeService.CHARACTERISTIC_UUID), unknownServiceString) + ">> Value: " + intent.getStringExtra(BluetoothLeService.EXTRA_DATA) + "]");
displayDimmer2(intent.getStringExtra(BluetoothLeService.EXTRA_DATA));
} else if (BluetoothLeService.ACTION_GATT_RSSI_UPDATE.equals(action)) {
updateRssi(intent.getIntExtra(BluetoothLeService.EXTRA_DATA, -400));
} else if (BluetoothLeService.ACTION_GATT_WRITE_FAILED.equals(action)) {
Log.e(TAG,"ACTION_GATT_WRITE_FAILED");
}
}
};
/*------------------------------------------------------------------------*/
@Override
public void onCreate() {
super.onCreate();
// -------------------Connect Ble--------------------------------------
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(BluetoothLeService.ACTION_GATT_CONNECTED);
intentFilter.addAction(BluetoothLeService.ACTION_GATT_DISCONNECTED);
intentFilter.addAction(BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED);
intentFilter.addAction(BluetoothLeService.ACTION_DATA_AVAILABLE);
intentFilter.addAction(BluetoothLeService.ACTION_GATT_RSSI_UPDATE);
intentFilter.addAction(BluetoothLeService.ACTION_GATT_WRITE_FAILED);
Log.e(TAG,"OnResume()");
getApplicationContext().registerReceiver(mGattUpdateReceiver, intentFilter);
getApplicationContext().bindService(new Intent(getApplicationContext(), BluetoothLeService.class), mServiceConnection, 1);
mHandler2=new Handler();
}
private BluetoothGattCharacteristic mNotifyCharacteristic;
private final ServiceConnection mServiceConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName componentName, IBinder service) {
mBluetoothLeService = ((BluetoothLeService.LocalBinder) service).getService();
if (!mBluetoothLeService.initialize()) {
Log.e(TAG, "Unable to initialize Bluetooth");
}
}
public void onServiceDisconnected(ComponentName componentName) {
mBluetoothLeService = null;
}
};
private boolean notificationActive = true;
private int numberOfRssi = 0;
private Runnable startRssi = new Runnable() {
public void run() {
if (mConnected) {
mBluetoothLeService.readRemoteRssi();
mHandler2.postDelayed(startRssi, 200);
}
}
};
public BluetoothGatt getmGatt() {
return mGatt;
}
//code from DeviceControlActivity
private void updateConnectionState(final int resourceId) {
connectionStatus= String.valueOf(resourceId);
Log.e(TAG,"Resource ID"+resourceId);
}
private void displayDimmerData(String data){
Log.e(TAG,"Display Data :"+data);
}
private void displayDimmer2(String data){
Log.e(TAG,"display Dimmer2"+data);
String sosString = data.substring(0, Math.min(data.length(), 3));
Log.e(TAG,"SOS String :"+sosString);
if (sosString.equals("SOS")){
Intent callIntent = new Intent(Intent.ACTION_CALL);
callIntent.setData(Uri.parse("tel:"+ SharedPreferencesUtils.getStringFromSharedPreferences(KEY_SP_MOBILE_NUMBER,getApplicationContext())));
callIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
getApplicationContext().startActivity(callIntent);
}
}
private void updateRssi(int data) {
if (data > -400) {
if (this.numberOfRssi > 10) {
this.avgRssi = ((9.0f * this.avgRssi) + ((float) data)) / 10.0f;
} else {
this.avgRssi = (this.avgRssi + ((float) data)) / 2.0f;
this.numberOfRssi++;
}
connectionStatus="Connected, RSSI:" + data + ", Avg:" + Math.round(this.avgRssi);
}
}
/*-------------------------disaplay gatt service for dimmer----------------------*/
private void displayGattServicesForDimmer(List<BluetoothGattService> gattServices) {
if (gattServices != null) {
String unknownServiceString = getResources().getString(R.string.unknown_service);
String unknownCharaString = getResources().getString(R.string.unknown_characteristic);
ArrayList<HashMap<String, String>> gattServiceData = new ArrayList();
ArrayList<ArrayList<HashMap<String, String>>> gattCharacteristicData = new ArrayList();
this.mGattCharacteristics = new ArrayList();
for (BluetoothGattService gattService : gattServices) {
HashMap<String, String> currentServiceData = new HashMap();
String uuid = gattService.getUuid().toString();
currentServiceData.put("NAME", SampleGattAttributes.lookup(uuid, unknownServiceString));
currentServiceData.put("UUID", uuid);
gattServiceData.add(currentServiceData);
ArrayList<HashMap<String, String>> gattCharacteristicGroupData = new ArrayList();
List<BluetoothGattCharacteristic> gattCharacteristics = gattService.getCharacteristics();
ArrayList<BluetoothGattCharacteristic> charas = new ArrayList();
for (BluetoothGattCharacteristic gattCharacteristic : gattCharacteristics) {
charas.add(gattCharacteristic);
HashMap<String, String> currentCharaData = new HashMap();
uuid = gattCharacteristic.getUuid().toString();
currentCharaData.put("NAME", "\t\t\t<<" + SampleGattAttributes.lookup(uuid, unknownCharaString) + ">>");
currentCharaData.put("UUID", "\t\t\tUUID: 0x" + uuid.substring(4, 8) + ", Properties: " + translateProperties(gattCharacteristic.getProperties()));
gattCharacteristicGroupData.add(currentCharaData);
Log.i(TAG,"CUrrent CHARACTERISTIC DATA"+currentCharaData);
Log.i(TAG,"UUID : "+uuid.substring(4, 8));
Log.i(TAG,"Proprties : "+gattCharacteristic.getProperties());
Log.i(TAG,"Translate Proprties : "+translateProperties(gattCharacteristic.getProperties()));
Log.i(TAG,"char list"+gattCharacteristicData.toString());
}
gattService4=gattService;
this.mGattCharacteristics.add(charas);
}
if (mGattCharacteristics.get(3)!=null) {
lastCharacteristic = new ArrayList<>(mGattCharacteristics.get(3));
enableNotifyOfCharcteristicForDimmer(lastCharacteristic);
}
}
}
private String translateProperties(int properties) {
String s = "";
if ((properties & 1) > 0) {
s = new StringBuilder(String.valueOf(s)).append("/Broadcast").toString();
}
if ((properties & 2) > 0) {
s = new StringBuilder(String.valueOf(s)).append("/Read").toString();
}
if ((properties & 4) > 0) {
s = new StringBuilder(String.valueOf(s)).append("/WriteWithoutResponse").toString();
}
if ((properties & 8) > 0) {
s = new StringBuilder(String.valueOf(s)).append("/Write").toString();
}
if ((properties & 16) > 0) {
s = new StringBuilder(String.valueOf(s)).append("/Notify").toString();
}
if ((properties & 32) > 0) {
s = new StringBuilder(String.valueOf(s)).append("/Indicate").toString();
}
if ((properties & 64) > 0) {
s = new StringBuilder(String.valueOf(s)).append("/SignedWrite").toString();
}
if ((properties & 128) > 0) {
s = new StringBuilder(String.valueOf(s)).append("/ExtendedProperties").toString();
}
if (s.length() > 1) {
return s.substring(1);
}
return s;
}
// Enable Characteristic for dimmer
public void enableNotifyOfCharcteristicForDimmer(ArrayList<BluetoothGattCharacteristic> lastCharacteristic){
if(mGattCharacteristics!=null) {
checkCharacteristicPresent(lastCharacteristic.get(0));
mBluetoothLeService.setCharacteristicNotification(lastCharacteristic.get(0), true);
notificationActive = true;
Log.e(TAG,"Characteristic index : "+0+":\nM GATT CHARACTERISTIC AT "+"Service 4 : CHAR"+ 0 +" :" +lastCharacteristic.get(0).toString());
checkCharacteristicPresent(lastCharacteristic.get(1));
mBluetoothLeService.setCharacteristicNotification(lastCharacteristic.get(1), true);
notificationActive = true;
Log.e(TAG,"Characteristic index : "+1+":\nM GATT CHARACTERISTIC AT "+"Service 4 : CHAR"+ 1 +" :" +lastCharacteristic.get(1).toString());
checkCharacteristicPresent(lastCharacteristic.get(2));
mBluetoothLeService.setCharacteristicNotification(lastCharacteristic.get(2), true);
notificationActive = true;
Log.e(TAG,"Characteristic index : "+2+":\nM GATT CHARACTERISTIC AT "+"Service 4 : CHAR"+ 2 +" :" +lastCharacteristic.get(2).toString());
checkCharacteristicPresent(lastCharacteristic.get(3));
mBluetoothLeService.setCharacteristicNotification(lastCharacteristic.get(3), true);
notificationActive = true;
Log.e(TAG,"Characteristic index : "+3+":\nM GATT CHARACTERISTIC AT "+"Service 4 : CHAR"+ 3 +" :" +lastCharacteristic.get(3).toString());
checkCharacteristicPresent(lastCharacteristic.get(4));
mBluetoothLeService.setCharacteristicNotification(lastCharacteristic.get(4), true);
notificationActive = true;
Log.e(TAG,"Characteristic index : "+4+":\nM GATT CHARACTERISTIC AT "+"Service 4 : CHAR"+ 4 +" :" +lastCharacteristic.get(4).toString());
checkCharacteristicPresent(lastCharacteristic.get(5));
mBluetoothLeService.setCharacteristicNotification(lastCharacteristic.get(5), true);
notificationActive = true;
Log.e(TAG,"Characteristic index : "+5+":\nM GATT CHARACTERISTIC AT "+"Service 4 : CHAR"+ 5 +" :" +lastCharacteristic.get(5).toString());
checkCharacteristicPresent(lastCharacteristic.get(2));
mBluetoothLeService.setCharacteristicNotification(lastCharacteristic.get(2), true);
notificationActive = true;
Log.e(TAG,"Characteristic index : "+2+":\nM GATT CHARACTERISTIC AT "+"Service 4 : CHAR"+ 2 +" :" +lastCharacteristic.get(2).toString());
}
}
// Check the type of characteristic i.e READ/WRITE/NOTIFY
public void checkCharacteristicPresent(BluetoothGattCharacteristic characteristic) {
int charaProp = characteristic.getProperties();
Log.e(TAG, "checkCharacteristicPresent Prop : " + charaProp);
mBluetoothLeService.setCurrentCharacteristic(characteristic);
if ((charaProp & 2) > 0) {
Log.e(TAG, "CharProp & 2 : " + charaProp);
mBluetoothLeService.readCharacteristic(characteristic);
}
if ((charaProp & 16) > 0) {
Log.e(TAG, "CharProp & 16 : " + charaProp);
mNotifyCharacteristic = characteristic;
} else {
if (mNotifyCharacteristic != null) {
mBluetoothLeService.setCharacteristicNotification(mNotifyCharacteristic, false);
mNotifyCharacteristic = null;
}
}
if ((charaProp & 8) > 0 || (charaProp & 4) > 0) {
Log.e(TAG, "CharProp & 4 : " + charaProp);
} else {
Log.e(TAG, "Else : " + charaProp);
}
}
}
Write this code in manifest.xml
<service android:name=".service.BackgroundService" />
Upvotes: 0
Ready Android
Reputation: 3622
You have to do all in the background for that start sticky service and in onStartCommand of that services start scanning.
package com.myapp.services;
import java.util.List;
import android.annotation.TargetApi;
import android.app.Service;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCallback;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattService;
import android.bluetooth.BluetoothManager;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Handler;
import android.os.IBinder;
import android.os.Looper;
import android.preference.PreferenceManager;
import android.support.v4.content.LocalBroadcastManager;
import android.text.TextUtils;
import android.widget.Toast;
import com.myapp.R;
/**Both RX and RSSI (Received Signal Strength Indication) are indications of the power level being received
* by an antenna
* The difference between RX and RSSI is that RX is measured in milliWatts (mW) or decibel-milliwatts (dBm)
* whereas RSSI is a signal strength percentage—the higher the RSSI number, the stronger the signal
*
*/
@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
public class BeaconService extends Service implements BluetoothAdapter.LeScanCallback{
private static final String TAG = BeaconService.class.getSimpleName();
private BluetoothGatt btGatt;
private BluetoothAdapter mBluetoothAdapter;
@Override
public void onCreate() {
super.onCreate();
writeLine("Automate service created...");
getBTService();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
writeLine("Automate service start...");
if (!isBluetoothSupported()) {
Toast.makeText(this, R.string.ble_not_supported, Toast.LENGTH_SHORT).show();
stopSelf();
}else{
if(mBluetoothAdapter!=null && mBluetoothAdapter.isEnabled()){
startBLEscan();
}else{
stopSelf();
}
}
return START_STICKY;
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onDestroy() {
writeLine("Automate service destroyed...");
stopBLEscan();
super.onDestroy();
if(btGatt!=null){
btGatt.disconnect();
btGatt.close();
btGatt = null;
}
}
@Override
public boolean stopService(Intent name) {
writeLine("Automate service stop...");
stopSelf();
return super.stopService(name);
}
// Initializes a Bluetooth adapter. For API level 18 and above, get a reference to
// BluetoothAdapter through BluetoothManager.
public BluetoothAdapter getBTService(){
BluetoothManager btManager = (BluetoothManager) getApplicationContext().getSystemService(Context.BLUETOOTH_SERVICE);
mBluetoothAdapter = (BluetoothAdapter) btManager.getAdapter();
return mBluetoothAdapter;
}
public boolean isBluetoothSupported() {
return this.getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE);
}
public void startBLEscan(){
mBluetoothAdapter.startLeScan(this);
}
public void stopBLEscan(){
mBluetoothAdapter.stopLeScan(this);
}
/**
*
* @param enable
*/
public void scanLeDevice(final boolean enable) {
if (enable) {
startBLEscan();
} else {
stopBLEscan();
}
}
public static void enableDisableBluetooth(boolean enable){
BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter != null) {
if(enable) {
bluetoothAdapter.enable();
}else{
bluetoothAdapter.disable();
}
}
}
@Override
public void onLeScan(final BluetoothDevice device, final int rssi, byte[] scanRecord) {
if(device!=null && device.getName()!=null){
//Log.d(TAG + " onLeScan: ", "Name: "+device.getName() + "Address: "+device.getAddress()+ "RSSI: "+rssi);
if(rssi > -90 && rssi <-1){
writeLine("Automate service BLE device in range: "+ device.getName()+ " "+rssi);
if (device.getName().equalsIgnoreCase("NCS_Beacon") || device.getName().equalsIgnoreCase("estimote")) {
//This Main looper thread is main for connect gatt, don't remove it
// Although you need to pass an appropriate context getApplicationContext(),
//Here if you use Looper.getMainLooper() it will stop getting callback and give internal exception fail to register //callback
new Handler(getApplicationContext().getMainLooper()).post(new Runnable() {
@Override
public void run() {
btGatt = device.connectGatt(getApplicationContext(), false, bleGattCallback);
Log.e(TAG, "onLeScan btGatt value returning from connectGatt "+btGatt);
}
});
}
stopBLEscan();
}else{
//Log.v("Device Scan Activity", device.getAddress()+" "+"BT device is still too far - not connecting");
}
}
}
BluetoothGattCallback bleGattCallback = new BluetoothGattCallback() {
@Override
public void onConnectionStateChange(final BluetoothGatt gatt, int status, int newState) {
super.onConnectionStateChange(gatt, status, newState);
writeLine("Automate service connection state: "+ newState);
if (newState == android.bluetooth.BluetoothProfile.STATE_CONNECTED){
writeLine("Automate service connection state: STATE_CONNECTED");
Log.v("BLEService", "BLE Connected now discover services");
Log.v("BLEService", "BLE Connected");
new Thread(new Runnable() {
@Override
public void run() {
writeLine("Automate service go for discover services");
gatt.discoverServices();
}
}).start();
}else if (newState == android.bluetooth.BluetoothProfile.STATE_DISCONNECTED){
writeLine("Automate service connection state: STATE_DISCONNECTED");
Log.v("BLEService", "BLE Disconnected");
}
}
@Override
public void onServicesDiscovered(final BluetoothGatt gatt, int status) {
super.onServicesDiscovered(gatt, status);
if (status == BluetoothGatt.GATT_SUCCESS) {
writeLine("Automate service discover service: GATT_SUCCESS");
Log.v("BLEService", "BLE Services onServicesDiscovered");
//Get service
List<BluetoothGattService> services = gatt.getServices();
writeLine("Automate service discover service imei: " +imei);
}
}
@Override
public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
super.onCharacteristicRead(gatt, characteristic, status);
}
@Override
public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
super.onCharacteristicChanged(gatt, characteristic);
}
};
private void writeLine(final String message) {
Handler h = new Handler(getApplicationContext().getMainLooper());
// Although you need to pass an appropriate context
h.post(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),message,Toast.LENGTH_SHORT).show();
}
});
}
}
In manifest.xml
<uses-feature
android:name="android.hardware.bluetooth_le"
android:required="true" />
<!-- Permission for bluetooth -->
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<service
android:name="com.myapp.services.BeaconService"
android:enabled="true"
android:exported="false" />
Upvotes: 5
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