Java tutorial
/* * Copyright (C) 2013 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.qi.airstat; 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.BluetoothGattDescriptor; import android.bluetooth.BluetoothGattService; import android.bluetooth.BluetoothManager; import android.bluetooth.BluetoothProfile; import android.content.ContentValues; import android.content.Context; import android.content.Intent; import android.database.sqlite.SQLiteDatabase; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.os.Binder; import android.os.Bundle; import android.os.IBinder; import android.util.Log; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import java.text.SimpleDateFormat; import java.util.Date; import java.util.List; import java.util.UUID; /** * Service for managing connection and data communication with a GATT server hosted on a * given Bluetooth LE device. */ public class BluetoothLeService extends Service { private final static String TAG = BluetoothLeService.class.getSimpleName(); private BluetoothManager mBluetoothManager; private BluetoothAdapter mBluetoothAdapter; private String mBluetoothDeviceAddress; private BluetoothGatt mBluetoothGatt; private int mConnectionState = STATE_DISCONNECTED; private LocationManager locationManager = null; private static final int STATE_DISCONNECTED = 0; private static final int STATE_CONNECTING = 1; private static final int STATE_CONNECTED = 2; public final static String ACTION_GATT_CONNECTED = "com.randomcube.bluetoothlesandbox.le.ACTION_GATT_CONNECTED"; public final static String ACTION_GATT_DISCONNECTED = "com.randomcube.bluetoothlesandbox.le.ACTION_GATT_DISCONNECTED"; public final static String ACTION_GATT_SERVICES_DISCOVERED = "com.randomcube.bluetoothlesandbox.le.ACTION_GATT_SERVICES_DISCOVERED"; public final static String ACTION_DATA_AVAILABLE = "com.randomcube.bluetoothlesandbox.le.ACTION_DATA_AVAILABLE"; public final static String EXTRA_DATA = "com.randomcube.bluetoothlesandbox.le.EXTRA_DATA"; public final static UUID UUID_HEART_RATE_MEASUREMENT = UUID .fromString(SampleGattAttributes.HEART_RATE_MEASUREMENT); private double latitude = 0; private double longitude = 0; @Override public void onCreate() { try { locationManager = (LocationManager) getSystemService(LOCATION_SERVICE); locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1, 1, locationListener); } catch (SecurityException exception) { exception.printStackTrace(); } } private final LocationListener locationListener = new LocationListener() { @Override public void onLocationChanged(final Location location) { latitude = location.getLatitude(); longitude = location.getLongitude(); } @Override public void onStatusChanged(String s, int i, Bundle bundle) { } @Override public void onProviderEnabled(String s) { } @Override public void onProviderDisabled(String s) { } }; // Implements callback methods for GATT events that the app cares about. For example, // connection change and services discovered. private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() { @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { String intentAction; if (newState == BluetoothProfile.STATE_CONNECTED) { intentAction = ACTION_GATT_CONNECTED; mConnectionState = STATE_CONNECTED; broadcastUpdate(intentAction); BluetoothState.isBLEConnected(true); Log.i(TAG, "Connected to GATT server."); // Attempts to discover services after successful connection. Log.i(TAG, "Attempting to start service discovery:" + mBluetoothGatt.discoverServices()); try { Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER); latitude = location.getLatitude(); longitude = location.getLongitude(); } catch (SecurityException exception) { exception.printStackTrace(); } JSONObject jsonObject = new JSONObject(); try { jsonObject.put("userID", Constants.UID); jsonObject.put("conCreationTime", new SimpleDateFormat("yyMMddHHmmss").format(new java.util.Date())); jsonObject.put("flagValidCon", 1); jsonObject.put("devMAC", "x'" + Constants.MAC_POLAR.replaceAll(":", "") + "'"); jsonObject.put("devType", Constants.DEVICE_TYPE_POLAR); jsonObject.put("devPortability", 0x01); jsonObject.put("latitude", "x'" + latitude); jsonObject.put("longitude", "x'" + longitude); } catch (JSONException exception) { exception.printStackTrace(); } HttpService httpService = new HttpService(); String res = httpService.executeConn(null, "POST", "http://teamc-iot.calit2.net/IOT/public/Connection", jsonObject); try { JSONObject resJson; resJson = new JSONObject(res); Log.d("BLCService", "Connection sent, response was " + res); Constants.CID_BLE = Integer.parseInt(resJson.getString("connectionID")); } catch (JSONException exception) { exception.printStackTrace(); } } else if (newState == BluetoothProfile.STATE_DISCONNECTED) { intentAction = ACTION_GATT_DISCONNECTED; mConnectionState = STATE_DISCONNECTED; BluetoothState.isBLEConnected(false); try { Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER); latitude = location.getLatitude(); longitude = location.getLongitude(); } catch (SecurityException exception) { exception.printStackTrace(); } JSONObject jsonObject = new JSONObject(); try { jsonObject.put("userID", Constants.UID); jsonObject.put("conCreationTime", new SimpleDateFormat("yyMMddHHmmss").format(new java.util.Date())); jsonObject.put("flagValidCon", 0); jsonObject.put("userID", Constants.UID); jsonObject.put("connectionID", Constants.CID_BLE); jsonObject.put("devMAC", "x'" + Constants.MAC_POLAR.replaceAll(":", "") + "'"); jsonObject.put("devType", Constants.DEVICE_TYPE_POLAR); jsonObject.put("devPortability", 0x01); jsonObject.put("latitude", "x'" + latitude); jsonObject.put("longitude", "x'" + longitude); } catch (JSONException exception) { exception.printStackTrace(); } HttpService httpService = new HttpService(); String response = httpService.executeConn(null, "POST", "http://teamc-iot.calit2.net/IOT/public/Disconnection", jsonObject); Constants.MAC_POLAR = null; Constants.CID_BLE = Constants.CID_NONE; Log.d("BLEService DISC RES", response); Log.i(TAG, "Disconnected from GATT server."); broadcastUpdate(intentAction); } } @Override public void onServicesDiscovered(BluetoothGatt gatt, int status) { if (status == BluetoothGatt.GATT_SUCCESS) { broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED); } else { Log.w(TAG, "onServicesDiscovered received: " + status); } } @Override public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { if (status == BluetoothGatt.GATT_SUCCESS) { broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic); } } @Override public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) { broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic); } }; private void broadcastUpdate(final String action) { final Intent intent = new Intent(action); sendBroadcast(intent); } private void broadcastUpdate(final String action, final BluetoothGattCharacteristic characteristic) { final Intent intent = new Intent(action); int signal = 0; // This is special handling for the Heart Rate Measurement profile. Data parsing is // carried out as per profile specifications: // http://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml if (UUID_HEART_RATE_MEASUREMENT.equals(characteristic.getUuid())) { int flag = characteristic.getProperties(); int format = -1; if ((flag & 0x01) != 0) { format = BluetoothGattCharacteristic.FORMAT_UINT16; Log.d(TAG, "Heart rate format UINT16."); } else { format = BluetoothGattCharacteristic.FORMAT_UINT8; Log.d(TAG, "Heart rate format UINT8."); } final int heartRate = characteristic.getIntValue(format, 1); signal = heartRate; Log.d(TAG, String.format("Received heart rate: %d", heartRate)); intent.putExtra(EXTRA_DATA, String.valueOf(heartRate)); } else { // For all other profiles, writes the data formatted in HEX. final byte[] data = characteristic.getValue(); if (data != null && data.length > 0) { final StringBuilder stringBuilder = new StringBuilder(data.length); for (byte byteChar : data) stringBuilder.append(String.format("%02X ", byteChar)); intent.putExtra(EXTRA_DATA, new String(data) + "\n" + stringBuilder.toString()); signal = Integer.parseInt(new String(data)); } } DatabaseManager databaseManager = new DatabaseManager(BluetoothLeService.this); SQLiteDatabase database = databaseManager.getWritableDatabase(); ContentValues values = new ContentValues(); String date = new SimpleDateFormat("yyMMddHHmmss").format(new java.util.Date()); values.put(Constants.DATABASE_COMMON_COLUMN_TIME_STAMP, date); values.put(Constants.DATABASE_HEART_RATE_COLUMN_HEART_RATE, signal); database.insert(Constants.DATABASE_HEART_RATE_TABLE, null, values); database.close(); try { Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER); latitude = location.getLatitude(); longitude = location.getLongitude(); } catch (SecurityException exception) { exception.printStackTrace(); } JSONObject reformedObject = new JSONObject(); JSONArray reformedArray = new JSONArray(); try { JSONObject item = new JSONObject(); item.put("timeStamp", date); item.put("connectionID", Constants.CID_BLE); item.put("heartrate", signal); item.put("latitude", latitude); item.put("longitude", longitude); reformedArray.put(item); reformedObject.put("HR", reformedArray); } catch (JSONException e) { e.printStackTrace(); } HttpService httpService = new HttpService(); String responseCode = httpService.executeConn(null, "POST", "http://teamc-iot.calit2.net/IOT/public/rcv_json_data", reformedObject); sendBroadcast(intent); } public class LocalBinder extends Binder { BluetoothLeService getService() { return BluetoothLeService.this; } } @Override public IBinder onBind(Intent intent) { return mBinder; } @Override public boolean onUnbind(Intent intent) { // After using a given device, you should make sure that BluetoothGatt.close() is called // such that resources are cleaned up properly. In this particular example, close() is // invoked when the UI is disconnected from the Service. close(); BluetoothState.isBLEConnected(false); return super.onUnbind(intent); } private final IBinder mBinder = new LocalBinder(); /** * Initializes a reference to the local Bluetooth adapter. * * @return Return true if the initialization is successful. */ public boolean initialize() { // For API level 18 and above, get a reference to BluetoothAdapter through // BluetoothManager. if (mBluetoothManager == null) { mBluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE); if (mBluetoothManager == null) { Log.e(TAG, "Unable to initialize BluetoothManager."); return false; } } mBluetoothAdapter = mBluetoothManager.getAdapter(); if (mBluetoothAdapter == null) { Log.e(TAG, "Unable to obtain a BluetoothAdapter."); return false; } return true; } /** * Connects to the GATT server hosted on the Bluetooth LE device. * * @param address The device address of the destination device. * * @return Return true if the connection is initiated successfully. The connection result * is reported asynchronously through the * {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)} * callback. */ public boolean connect(final String address) { if (mBluetoothAdapter == null || address == null) { Log.w(TAG, "BluetoothAdapter not initialized or unspecified address."); BluetoothState.isBLEConnected(false); return false; } // Previously connected device. Try to reconnect. if (mBluetoothDeviceAddress != null && address.equals(mBluetoothDeviceAddress) && mBluetoothGatt != null) { Log.d(TAG, "Trying to use an existing mBluetoothGatt for connection."); if (mBluetoothGatt.connect()) { mConnectionState = STATE_CONNECTING; return true; } else { BluetoothState.isBLEConnected(false); return false; } } final BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address); if (device == null) { Log.w(TAG, "Device not found. Unable to connect."); BluetoothState.isBLEConnected(false); return false; } // We want to directly connect to the device, so we are setting the autoConnect // parameter to false. mBluetoothGatt = device.connectGatt(this, false, mGattCallback); Log.d(TAG, "Trying to create a new connection."); mBluetoothDeviceAddress = address; mConnectionState = STATE_CONNECTING; Constants.MAC_POLAR = mBluetoothDeviceAddress; try { Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER); latitude = location.getLatitude(); longitude = location.getLongitude(); } catch (SecurityException exception) { exception.printStackTrace(); } JSONObject jsonObject = new JSONObject(); try { jsonObject.put("userID", Constants.UID); jsonObject.put("conCreationTime", new SimpleDateFormat("yyMMddHHmmss").format(new java.util.Date())); jsonObject.put("flagValidCon", 1); jsonObject.put("devMAC", "x'" + Constants.MAC_POLAR.replaceAll(":", "") + "'"); jsonObject.put("devType", Constants.DEVICE_TYPE_POLAR); jsonObject.put("devPortability", 0x01); jsonObject.put("latitude", "x'" + latitude); jsonObject.put("longitude", "x'" + longitude); } catch (JSONException exception) { exception.printStackTrace(); } HttpService httpService = new HttpService(); String res = httpService.executeConn(null, "POST", "http://teamc-iot.calit2.net/IOT/public/deviceReg", jsonObject); try { JSONObject resJson; resJson = new JSONObject(res); Log.d("BLEService", "DevReg sent, response was " + res); if (resJson.getInt("status") == 0) { return true; } else { mConnectionState = STATE_DISCONNECTED; Constants.MAC_POLAR = null; BluetoothState.isBLEConnected(false); return false; } } catch (JSONException exception) { exception.printStackTrace(); return false; } } /** * Disconnects an existing connection or cancel a pending connection. The disconnection result * is reported asynchronously through the * {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)} * callback. */ public void disconnect() { if (mBluetoothAdapter == null || mBluetoothGatt == null) { Log.w(TAG, "BluetoothAdapter not initialized"); return; } BluetoothState.isBLEConnected(false); mBluetoothGatt.disconnect(); } /** * After using a given BLE device, the app must call this method to ensure resources are * released properly. */ public void close() { if (mBluetoothGatt == null) { return; } mBluetoothGatt.close(); mBluetoothGatt = null; BluetoothState.isBLEConnected(false); } /** * Request a read on a given {@code BluetoothGattCharacteristic}. The read result is reported * asynchronously through the {@code BluetoothGattCallback#onCharacteristicRead(android.bluetooth.BluetoothGatt, android.bluetooth.BluetoothGattCharacteristic, int)} * callback. * * @param characteristic The characteristic to read from. */ public void readCharacteristic(BluetoothGattCharacteristic characteristic) { if (mBluetoothAdapter == null || mBluetoothGatt == null) { Log.w(TAG, "BluetoothAdapter not initialized"); return; } mBluetoothGatt.readCharacteristic(characteristic); } /** * Enables or disables notification on a give characteristic. * * @param characteristic Characteristic to act on. * @param enabled If true, enable notification. False otherwise. */ public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic, boolean enabled) { if (mBluetoothAdapter == null || mBluetoothGatt == null) { Log.w(TAG, "BluetoothAdapter not initialized"); return; } mBluetoothGatt.setCharacteristicNotification(characteristic, enabled); // This is specific to Heart Rate Measurement. if (UUID_HEART_RATE_MEASUREMENT.equals(characteristic.getUuid())) { BluetoothGattDescriptor descriptor = characteristic .getDescriptor(UUID.fromString(SampleGattAttributes.CLIENT_CHARACTERISTIC_CONFIG)); descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE); mBluetoothGatt.writeDescriptor(descriptor); } } /** * Retrieves a list of supported GATT services on the connected device. This should be * invoked only after {@code BluetoothGatt#discoverServices()} completes successfully. * * @return A {@code List} of supported services. */ public List<BluetoothGattService> getSupportedGattServices() { if (mBluetoothGatt == null) return null; return mBluetoothGatt.getServices(); } }