Java tutorial
/* * Copyright (C) 2014 Health Bracelet Team * * 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.netlinks.healthbracelet.service; import android.app.Notification; import android.app.PendingIntent; import android.app.Service; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.bluetooth.BluetoothServerSocket; import android.bluetooth.BluetoothSocket; import android.content.Context; import android.content.Intent; import android.os.Binder; import android.os.Bundle; import android.os.Handler; import android.os.IBinder; import android.os.Message; import android.support.v4.app.NotificationCompat; import android.util.Log; import android.widget.Toast; import com.netlinks.healthbracelet.MainActivity; import com.netlinks.healthbracelet.R; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.UUID; /* * Copyright (C) 2014 Health Bracelet Team * * 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. */ /** * @author Saif Chaouachi(ch.saiff35@gmail.com) * 1/28/14 */ public class HeartRateService extends Service { private final IBinder binder = new HeartRateServiceBinder(); float heartRate = 0; private void showOnGoingNotification() { final int NOTIFICATION_ID = 1; // Create an Intent that will open the main Activity // if the notification is clicked. // Set the Notification UI parameters final String name = getString(R.string.app_name); final NotificationCompat.Builder builder = new NotificationCompat.Builder(this); //TODO replace with implicit intent final Intent intent = new Intent(this, MainActivity.class); final PendingIntent pi = PendingIntent.getActivity(this, 0, intent, 0); builder.setSmallIcon(R.drawable.ic_launcher).setContentTitle("Heart Rate Monitor").setTicker(name) .setContentIntent(pi).setOngoing(true); final Notification notification = builder.build(); // Move the Service to the Foreground startForeground(NOTIFICATION_ID, notification); } @Override public int onStartCommand(Intent intent, int flags, int startId) { mState = STATE_NONE; BluetoothConfig(); showOnGoingNotification(); //restart the service ASAP in case it was killed by the system // ( resource critical situations) return START_STICKY; } public float getHeartRate() { return heartRate; } @Override public IBinder onBind(Intent intent) { return binder; } /** * Bluetooth Configuration * 1- Establishing the connection with the bracelet * 2- Create the socket */ public void BluetoothConfig() { final String address = "04:1B:BA:97:1A:33"; //Health Bracelet MAC address // If the adapter is null, then Bluetooth is not supported if (mAdapter == null) { Toast.makeText(this, "Bluetooth is not available", Toast.LENGTH_LONG).show(); stopSelf(); return; } else { if (mAdapter.isEnabled()) { Log.d(TAG, "...Bluetooth is ON..."); } else { Log.d(TAG, "...Bluetooth is OFF..."); //TODO Requesting to open bluetooth (in a proper way) Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); enableBtIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); //int REQUEST_ENABLE_BT = 404; getApplication().startActivity(enableBtIntent); } } Log.d(TAG, "...trying to connect..."); if (!BluetoothAdapter.checkBluetoothAddress(address)) { Log.d(TAG, "Fatal Error : Incorrect MAC-address"); } else { // Set up a pointer to the remote node using it's address. final BluetoothDevice device = mAdapter.getRemoteDevice(address); if (mState != STATE_CONNECTED) { this.connect(device); } } } public class HeartRateServiceBinder extends Binder { public HeartRateService getService() { return HeartRateService.this; } } // Debugging private static final String TAG = "BluetoothChatService"; private static final boolean D = true; // Name for the SDP record when creating server socket private static final String NAME = "BluetoothChat"; // Unique UUID for this application private static final UUID MY_UUID = UUID.fromString("fa87c0d0-afac-11de-8a39-0800200c9a66"); // Member fields private final BluetoothAdapter mAdapter; private ConnectThread mConnectThread; private ConnectedThread mConnectedThread; private int mState; // Constants that indicate the current connection state public static final int STATE_NONE = 0; // we're doing nothing public static final int STATE_LISTEN = 1; // now listening for incoming connections public static final int STATE_CONNECTING = 2; // now initiating an outgoing connection public static final int STATE_CONNECTED = 3; // now connected to a remote device // Message types sent from the BluetoothChatService Handler public static final int MESSAGE_STATE_CHANGE = 1; public static final int MESSAGE_READ = 2; public static final int MESSAGE_DEVICE_NAME = 3; public static final int MESSAGE_TOAST = 4; // Key names received from the BluetoothChatService Handler public static final String DEVICE_NAME = "device_name"; public static final String TOAST = "toast"; // The Handler that gets information back from the BluetoothChatService public final Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case MESSAGE_STATE_CHANGE: if (D) Log.i(TAG, "MESSAGE_STATE_CHANGE: " + msg.arg1); switch (msg.arg1) { case STATE_CONNECTED: Toast.makeText(getApplicationContext(), "BT State Changed " + "Connected !", Toast.LENGTH_SHORT) .show(); break; case STATE_CONNECTING: Toast.makeText(getApplicationContext(), "BT State Changed " + "Connecting ...", Toast.LENGTH_SHORT).show(); break; case STATE_LISTEN: case STATE_NONE: Toast.makeText(getApplicationContext(), "BT State changed :" + " not connected", Toast.LENGTH_SHORT).show(); break; } break; case MESSAGE_READ: byte[] readBuf = (byte[]) msg.obj; // construct a string from the valid bytes in the buffer String readMessage = new String(readBuf, 0, msg.arg1); Toast.makeText(getApplicationContext(), "Msg received : " + readMessage, Toast.LENGTH_LONG).show(); heartRate = Float.parseFloat(readMessage); //.obtainMessage(MESSAGE_READ, heartRate) // .sendToTarget(); break; case MESSAGE_DEVICE_NAME: // save the connected device's name String ConnectedDeviceName = msg.getData().getString(DEVICE_NAME); Toast.makeText(getApplicationContext(), "Connected to " + ConnectedDeviceName, Toast.LENGTH_SHORT) .show(); break; case MESSAGE_TOAST: Toast.makeText(getApplicationContext(), msg.getData().getString(TOAST), Toast.LENGTH_SHORT).show(); break; } } }; /** * Constructor. */ public HeartRateService() { mAdapter = BluetoothAdapter.getDefaultAdapter(); } /** * Set the current state of the BLUETOOTH connection * @param state An integer defining the current connection state */ private synchronized void setState(int state) { if (D) Log.d(TAG, "setState() " + mState + " -> " + state); mState = state; // Give the new state to the Handler so the UI Activity can update mHandler.obtainMessage(MESSAGE_STATE_CHANGE, state, -1).sendToTarget(); } /** * Return the current connection state. */ public synchronized int getState() { return mState; } /** * Start the heartRate service. */ public synchronized void start() { if (D) Log.d(TAG, "start"); // Cancel any thread attempting to make a connection if (mConnectThread != null) { mConnectThread.cancel(); mConnectThread = null; } // Cancel any thread currently running a connection if (mConnectedThread != null) { mConnectedThread.cancel(); mConnectedThread = null; } setState(STATE_LISTEN); } /** * Start the ConnectThread to initiate a connection to a remote device. * @param device The BluetoothDevice to connect */ public synchronized void connect(BluetoothDevice device) { if (D) Log.d(TAG, "connect to: " + device); // Cancel any thread attempting to make a connection if (mState == STATE_CONNECTING) { if (mConnectThread != null) { mConnectThread.cancel(); mConnectThread = null; } } // Cancel any thread currently running a connection if (mConnectedThread != null) { mConnectedThread.cancel(); mConnectedThread = null; } // Start the thread to connect with the given device mConnectThread = new ConnectThread(device); mConnectThread.start(); setState(STATE_CONNECTING); } /** * Start the ConnectedThread to begin managing a Bluetooth connection * @param socket The BluetoothSocket on which the connection was made * @param device The BluetoothDevice that has been connected */ public synchronized void connected(BluetoothSocket socket, BluetoothDevice device) { if (D) Log.d(TAG, "connected"); // Cancel the thread that completed the connection if (mConnectThread != null) { mConnectThread.cancel(); mConnectThread = null; } // Cancel any thread currently running a connection if (mConnectedThread != null) { mConnectedThread.cancel(); mConnectedThread = null; } // Start the thread to manage the connection and perform transmissions mConnectedThread = new ConnectedThread(socket); mConnectedThread.start(); // Send the name of the connected device back to the UI Activity Message msg = mHandler.obtainMessage(MESSAGE_DEVICE_NAME); Bundle bundle = new Bundle(); bundle.putString(DEVICE_NAME, device.getName()); msg.setData(bundle); mHandler.sendMessage(msg); setState(STATE_CONNECTED); } /** * Stop all threads */ public synchronized void stop() { if (D) Log.d(TAG, "stop"); if (mConnectThread != null) { mConnectThread.cancel(); mConnectThread = null; } if (mConnectedThread != null) { mConnectedThread.cancel(); mConnectedThread = null; } setState(STATE_NONE); } /** * Indicate that the connection attempt failed and notify the UI Activity. */ private void connectionFailed() { setState(STATE_LISTEN); // Send a failure message back to the Activity Message msg = mHandler.obtainMessage(MESSAGE_TOAST); Bundle bundle = new Bundle(); bundle.putString(TOAST, "Unable to connect device"); msg.setData(bundle); mHandler.sendMessage(msg); } /** * Indicate that the connection was lost and notify the UI Activity. */ private void connectionLost() { setState(STATE_LISTEN); // Send a failure message back to the Activity Message msg = mHandler.obtainMessage(MESSAGE_TOAST); Bundle bundle = new Bundle(); bundle.putString(TOAST, "Device connection was lost"); msg.setData(bundle); mHandler.sendMessage(msg); this.stop(); this.BluetoothConfig(); } /** * This thread runs while attempting to make an outgoing connection * with a device. It runs straight through; the connection either * succeeds or fails. */ private class ConnectThread extends Thread { private final BluetoothSocket mmSocket; private final BluetoothDevice mmDevice; public ConnectThread(BluetoothDevice device) { mmDevice = device; BluetoothSocket tmp = null; // Get a BluetoothSocket for a connection with the // given BluetoothDevice try { tmp = device.createRfcommSocketToServiceRecord(MY_UUID); } catch (IOException e) { Log.e(TAG, "create() failed", e); } mmSocket = tmp; } public void run() { Log.i(TAG, "BEGIN mConnectThread"); setName("ConnectThread"); // Always cancel discovery because it will slow down a connection mAdapter.cancelDiscovery(); // Make a connection to the BluetoothSocket try { // This is a blocking call and will only return on a // successful connection or an exception mmSocket.connect(); } catch (IOException e) { connectionFailed(); // Close the socket try { mmSocket.close(); } catch (IOException e2) { Log.e(TAG, "unable to close() socket during connection failure", e2); } // Start the service over to restart listening mode HeartRateService.this.start(); return; } // Reset the ConnectThread because we're done synchronized (HeartRateService.this) { mConnectThread = null; } // Start the connected thread connected(mmSocket, mmDevice); } public void cancel() { try { mmSocket.close(); } catch (IOException e) { Log.e(TAG, "close() of connect socket failed", e); } } } /** * This thread runs during a connection with a remote device. * It handles all incoming transmissions. */ private class ConnectedThread extends Thread { private final BluetoothSocket mmSocket; private final InputStream mmInStream; public ConnectedThread(BluetoothSocket socket) { Log.d(TAG, "create ConnectedThread"); mmSocket = socket; InputStream tmpIn = null; // Get the BluetoothSocket input stream try { tmpIn = socket.getInputStream(); } catch (IOException e) { Log.e(TAG, "temp sockets not created", e); } mmInStream = tmpIn; } public void run() { Log.i(TAG, "BEGIN mConnectedThread"); byte[] buffer = new byte[1024]; int bytes; // Keep listening to the InputStream while connected while (true) { try { // Read from the InputStream bytes = mmInStream.read(buffer); // Send the obtained bytes to the UI Activity mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer).sendToTarget(); } catch (IOException e) { Log.e(TAG, "disconnected", e); connectionLost(); break; } } } public void cancel() { try { mmSocket.close(); } catch (IOException e) { Log.e(TAG, "close() of connect socket failed", e); } } } }