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MIT License
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/* * Copyright (C) 2013 The Android Open Source Project */*from www .j a va 2 s. c o m*/ * 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.sample.hrv; 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.BluetoothProfile; import android.content.Context; import android.content.Intent; import android.os.Binder; import android.os.IBinder; import android.util.Log; import java.util.List; import com.sample.hrv.sensor.BleSensor; import com.sample.hrv.sensor.BleSensors; /** * Service for managing connection and data communication with a GATT server hosted on a * given Bluetooth LE device. */ public class BleService extends Service { private final static String TAG = BleService.class.getSimpleName(); private BluetoothManager bluetoothManager; private BluetoothAdapter adapter; private String deviceAddress; private BluetoothGatt gatt; private int connectionState = STATE_DISCONNECTED; private static final int STATE_DISCONNECTED = 0; private static final int STATE_CONNECTING = 1; private static final int STATE_CONNECTED = 2; private final static String INTENT_PREFIX = BleService.class.getPackage().getName(); public final static String ACTION_GATT_CONNECTED = INTENT_PREFIX+".ACTION_GATT_CONNECTED"; public final static String ACTION_GATT_DISCONNECTED = INTENT_PREFIX+".ACTION_GATT_DISCONNECTED"; public final static String ACTION_GATT_SERVICES_DISCOVERED = INTENT_PREFIX+".ACTION_GATT_SERVICES_DISCOVERED"; public final static String ACTION_DATA_AVAILABLE = INTENT_PREFIX+".ACTION_DATA_AVAILABLE"; public final static String EXTRA_SERVICE_UUID = INTENT_PREFIX+".EXTRA_SERVICE_UUID"; public final static String EXTRA_CHARACTERISTIC_UUID = INTENT_PREFIX+".EXTRA_CHARACTERISTIC_UUI"; public final static String EXTRA_DATA = INTENT_PREFIX+".EXTRA_DATA"; public final static String EXTRA_TEXT = INTENT_PREFIX+".EXTRA_TEXT"; // Implements callback methods for GATT events that the app cares about. // For example, connection change and services discovered. private final BluetoothGattExecutor executor = new BluetoothGattExecutor() { @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { super.onConnectionStateChange(gatt, status, newState); String intentAction; if (newState == BluetoothProfile.STATE_CONNECTED) { intentAction = ACTION_GATT_CONNECTED; connectionState = STATE_CONNECTED; broadcastUpdate(intentAction); Log.i(TAG, "Connected to GATT server."); // Attempts to discover services after successful connection. Log.i(TAG, "Attempting to start service discovery:" + BleService.this.gatt.discoverServices()); } else if (newState == BluetoothProfile.STATE_DISCONNECTED) { intentAction = ACTION_GATT_DISCONNECTED; connectionState = STATE_DISCONNECTED; Log.i(TAG, "Disconnected from GATT server."); broadcastUpdate(intentAction); } } @Override public void onServicesDiscovered(BluetoothGatt gatt, int status) { super.onServicesDiscovered(gatt, 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) { super.onCharacteristicRead(gatt, characteristic, status); if (status == BluetoothGatt.GATT_SUCCESS) { final BleSensor<?> sensor = BleSensors.getSensor(characteristic.getService().getUuid().toString()); if (sensor != null) { if (sensor.onCharacteristicRead(characteristic)) { return; } } broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic); } } @Override public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) { super.onCharacteristicChanged(gatt, 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); intent.putExtra(EXTRA_SERVICE_UUID, characteristic.getService().getUuid().toString()); intent.putExtra(EXTRA_CHARACTERISTIC_UUID, characteristic.getUuid().toString()); final BleSensor<?> sensor = BleSensors.getSensor(characteristic.getService().getUuid().toString()); if (sensor != null) { sensor.onCharacteristicChanged(characteristic); final String text = sensor.getDataString(); intent.putExtra(EXTRA_TEXT, text); sendBroadcast(intent); } 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_TEXT, new String(data) + "\n" + stringBuilder.toString()); } } sendBroadcast(intent); } public class LocalBinder extends Binder { public BleService getService() { return BleService.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(); return super.onUnbind(intent); } /** * Enables or disables notification on a give characteristic. * * @param sensor * @param enabled If true, enable notification. False otherwise. */ public void enableSensor(BleSensor<?> sensor, boolean enabled) { if (sensor == null) return; if (adapter == null || gatt == null) { Log.w(TAG, "BluetoothAdapter not initialized"); return; } executor.enable(sensor, enabled); executor.execute(gatt); } 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 (bluetoothManager == null) { bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE); if (bluetoothManager == null) { Log.e(TAG, "Unable to initialize BluetoothManager."); return false; } } adapter = bluetoothManager.getAdapter(); if (adapter == 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 (adapter == null || address == null) { Log.w(TAG, "BluetoothAdapter not initialized or unspecified address."); return false; } // Previously connected device. Try to reconnect. if (deviceAddress != null && address.equals(deviceAddress) && gatt != null) { Log.d(TAG, "Trying to use an existing BluetoothGatt for connection."); if (gatt.connect()) { connectionState = STATE_CONNECTING; return true; } else { return false; } } final BluetoothDevice device = adapter.getRemoteDevice(address); if (device == null) { Log.w(TAG, "Device not found. Unable to connect."); return false; } // We want to directly connect to the device, so we are setting the autoConnect // parameter to false. gatt = device.connectGatt(this, false, executor); Log.d(TAG, "Trying to create a new connection."); deviceAddress = address; connectionState = STATE_CONNECTING; return true; } /** * 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 (adapter == null || gatt == null) { Log.w(TAG, "BluetoothAdapter not initialized"); return; } gatt.disconnect(); } /** * After using a given BLE device, the app must call this method to ensure resources are * released properly. */ public void close() { if (gatt == null) { return; } gatt.close(); gatt = null; } /** * 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 (adapter == null || gatt == null) { Log.w(TAG, "BluetoothAdapter not initialized"); return; } gatt.readCharacteristic(characteristic); } public void updateSensor(BleSensor<?> sensor) { if (sensor == null) return; if (adapter == null || gatt == null) { Log.w(TAG, "BluetoothAdapter not initialized"); return; } executor.update(sensor); executor.execute(gatt); } /** * 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 (gatt == null) return null; return gatt.getServices(); } }