Java tutorial
/* * Copyright (C) 2009 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.authorwjf.bounce; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.math.BigInteger; import java.util.concurrent.ConcurrentHashMap; import java.util.ArrayList; import java.util.UUID; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.util.EntityUtils; import org.json.JSONException; import org.json.JSONObject; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.bluetooth.BluetoothServerSocket; import android.bluetooth.BluetoothSocket; import android.content.Context; import android.os.AsyncTask; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.util.Log; /** * This class does all the work for setting up and managing Bluetooth * connections with other devices. It has a thread that listens for * incoming connections, a thread for connecting with a device, and a * thread for performing data transmissions when connected. */ public class BluetoothChatService { // 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_SECURE = "BluetoothChatSecure"; private static final String NAME_INSECURE = "BluetoothChatInsecure"; // Unique UUID for this application public static final UUID MY_UUID_SECURE = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); public static final UUID MY_UUID_INSECURE = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); // Member fields private final BluetoothAdapter mAdapter; private final Handler mHandler; private AcceptThread mSecureAcceptThread; private AcceptThread mInsecureAcceptThread; private ConnectThread mConnectThread; private ConnectedThread mConnectedThread; private int mState; private double MAFval = 0.000001; private double VSS = 0.000001; public static long last_data_collection = 0; public static boolean end_game = false; public static double currentMPG = 0; public static ArrayList<Double> allMPG = new ArrayList<Double>(); private static double averageMPG = 0; private static double milesTraveled = 0; private static double gallonsUsed = 0; private static long lastTime = 0; public static final double KILOMETERS_IN_A_MILE = 1.609344; private static ConcurrentHashMap<String, String> mapValues; // 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 /** * Constructor. Prepares a new BluetoothChat session. * @param context The UI Activity Context * @param handler A Handler to send messages back to the UI Activity */ public BluetoothChatService(Context context, Handler handler) { mAdapter = BluetoothAdapter.getDefaultAdapter(); mState = STATE_NONE; mHandler = handler; mapValues = new ConcurrentHashMap<String, String>(); } /** * Set the current state of the chat connection * @param state An integer defining the current connection state */ private synchronized void setState(int state) { mState = state; // Give the new state to the Handler so the UI Activity can update // mHandler.obtainMessage(BluetoothChat.MESSAGE_STATE_CHANGE, state, -1).sendToTarget(); } /** * Return the current connection state. */ public synchronized int getState() { return mState; } /** * Start the chat service. Specifically start AcceptThread to begin a * session in listening (server) mode. Called by the Activity onResume() */ public synchronized void 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 thread to listen on a BluetoothServerSocket /*if (mSecureAcceptThread == null) { mSecureAcceptThread = new AcceptThread(true); mSecureAcceptThread.start(); }*/ if (mInsecureAcceptThread == null) { mInsecureAcceptThread.start(); } } /** * Start the ConnectThread to initiate a connection to a remote device. * @param device The BluetoothDevice to connect * @param secure Socket Security type - Secure (true) , Insecure (false) */ public synchronized void connect(BluetoothDevice device, boolean secure) { // 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, secure); 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, final String socketType) { // 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; } // Cancel the accept thread because we only want to connect to one device if (mSecureAcceptThread != null) { mSecureAcceptThread.cancel(); mSecureAcceptThread = null; } if (mInsecureAcceptThread != null) { mInsecureAcceptThread.cancel(); mInsecureAcceptThread = null; } // Start the thread to manage the connection and perform transmissions mConnectedThread = new ConnectedThread(socket, socketType); mConnectedThread.start(); // Send the name of the connected device back to the UI Activity Message msg = mHandler.obtainMessage(BluetoothChat.MESSAGE_DEVICE_NAME); Bundle bundle = new Bundle(); bundle.putString(BluetoothChat.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; } if (mSecureAcceptThread != null) { mSecureAcceptThread.cancel(); mSecureAcceptThread = null; } if (mInsecureAcceptThread != null) { mInsecureAcceptThread.cancel(); mInsecureAcceptThread = null; } setState(STATE_NONE); } /** * Write to the ConnectedThread in an unsynchronized manner * @param out The bytes to write * @see ConnectedThread#write(byte[]) */ public void write(byte[] out) { // Create temporary object ConnectedThread r; // Synchronize a copy of the ConnectedThread synchronized (this) { if (mState != STATE_CONNECTED) return; r = mConnectedThread; } // Perform the write unsynchronized r.write(out); } /** * Used to obtain data so other services can calculate quantities. * Valid values to retrieve are the following: * rpm * speed * intakeTemp * MAF * runSec * numWarmup * baro * ambTemp * throttle */ public static String retrieveDatum(String key) { return mapValues.get(key); } /** * Indicate that the connection attempt failed and notify the UI Activity. */ private void connectionFailed() { // Send a failure message back to the Activity Message msg = mHandler.obtainMessage(BluetoothChat.MESSAGE_TOAST); Bundle bundle = new Bundle(); bundle.putString(BluetoothChat.TOAST, "Unable to connect device"); msg.setData(bundle); mHandler.sendMessage(msg); // Start the service over to restart listening mode BluetoothChatService.this.start(); } /** * Indicate that the connection was lost and notify the UI Activity. */ private void connectionLost() { // Send a failure message back to the Activity Message msg = mHandler.obtainMessage(BluetoothChat.MESSAGE_TOAST); Bundle bundle = new Bundle(); bundle.putString(BluetoothChat.TOAST, "Device connection was lost"); msg.setData(bundle); mHandler.sendMessage(msg); // Start the service over to restart listening mode BluetoothChatService.this.start(); } /** * This thread runs while listening for incoming connections. It behaves * like a server-side client. It runs until a connection is accepted * (or until cancelled). */ private class AcceptThread extends Thread { // The local server socket private final BluetoothServerSocket mmServerSocket; private String mSocketType; public AcceptThread(boolean secure) { BluetoothServerSocket tmp = null; mSocketType = secure ? "Secure" : "Insecure"; // Create a new listening server socket try { if (secure) { tmp = mAdapter.listenUsingRfcommWithServiceRecord(NAME_SECURE, MY_UUID_SECURE); } else { tmp = mAdapter.listenUsingInsecureRfcommWithServiceRecord(NAME_INSECURE, MY_UUID_INSECURE); } } catch (IOException e) { Log.e(TAG, "Socket Type: " + mSocketType + "listen() failed", e); } mmServerSocket = tmp; } public void run() { setName("AcceptThread" + mSocketType); BluetoothSocket socket = null; // Listen to the server socket if we're not connected while (mState != STATE_CONNECTED) { try { // This is a blocking call and will only return on a // successful connection or an exception socket = mmServerSocket.accept(); } catch (IOException e) { Log.e(TAG, "Socket Type: " + mSocketType + "accept() failed", e); break; } // If a connection was accepted if (socket != null) { synchronized (BluetoothChatService.this) { switch (mState) { case STATE_LISTEN: case STATE_CONNECTING: // Situation normal. Start the connected thread. connected(socket, socket.getRemoteDevice(), mSocketType); break; case STATE_NONE: case STATE_CONNECTED: // Either not ready or already connected. Terminate new socket. try { socket.close(); } catch (IOException e) { Log.e(TAG, "Could not close unwanted socket", e); } break; } } } } } public void cancel() { try { mmServerSocket.close(); } catch (IOException e) { Log.e(TAG, "Socket Type" + mSocketType + "close() of server failed", e); } } } /** * 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; private String mSocketType; public ConnectThread(BluetoothDevice device, boolean secure) { mmDevice = device; BluetoothSocket tmp = null; mSocketType = secure ? "Secure" : "Insecure"; // Get a BluetoothSocket for a connection with the // given BluetoothDevice try { Method m = device.getClass().getMethod("createInsecureRfcommSocket", new Class[] { int.class }); tmp = (BluetoothSocket) m.invoke(device, 1); } catch (IllegalArgumentException e) { Log.e(TAG, "IllegalArgumentException: " + e); } catch (NoSuchMethodException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (InvocationTargetException e) { // TODO Auto-generated catch block e.printStackTrace(); } mmSocket = tmp; } public void run() { setName("ConnectThread" + mSocketType); // 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(); // THIS LINE IS BROKEN } catch (IOException e) { // Close the socket Log.e(TAG, "Exception at " + e); try { mmSocket.close(); } catch (IOException e2) { Log.e(TAG, "unable to close() " + mSocketType + " socket during connection failure", e2); } connectionFailed(); return; } // Reset the ConnectThread because we're done synchronized (BluetoothChatService.this) { mConnectThread = null; } // Start the connected thread connected(mmSocket, mmDevice, mSocketType); } public void cancel() { try { mmSocket.close(); } catch (IOException e) { Log.e(TAG, "close() of connect " + mSocketType + " socket failed", e); } } } /** * This thread runs during a connection with a remote device. * It handles all incoming and outgoing transmissions. */ private class ConnectedThread extends Thread { private final BluetoothSocket mmSocket; private final InputStream mmInStream; private final OutputStream mmOutStream; private final BufferedReader mmInStreamBuf; public ConnectedThread(BluetoothSocket socket, String socketType) { mmSocket = socket; InputStream tmpIn = null; OutputStream tmpOut = null; // Get the BluetoothSocket input and output streams try { tmpIn = socket.getInputStream(); tmpOut = socket.getOutputStream(); } catch (IOException e) { Log.e(TAG, "temp sockets not created", e); } mmInStream = tmpIn; mmOutStream = tmpOut; mmInStreamBuf = new BufferedReader(new InputStreamReader(tmpIn)); } private double calculateMPG() { double mpg = (710.7 * VSS) / MAFval; return mpg; } private class postDataTask extends AsyncTask<String, Integer, Integer> { @Override protected Integer doInBackground(String... params) { try { HttpClient client = new DefaultHttpClient(); double cur_mpg = calculateMPG(); //String getURL = "http://omnidrive.herokuapp.com/data?fbid=" + Main.fbid + "&highscore=" + cur_mpg; currentMPG = cur_mpg; allMPG.add(currentMPG); /*for(String out: mapValues.keySet()) { getURL += "&" + out + "=" + mapValues.get(out); } System.out.println(getURL);*/ mapValues.clear(); /* Dont send MPG every time; wait until a number of values are accumulated and then send them all at once */ if (allMPG.size() > 30) { String getURL = "http://www.omnidrive.io/api/?fbid=" + Main.fbid + "&mpgs=" + allMPG.toString().replaceAll("\\s", ""); getURL = getURL.replace("[", ""); getURL = getURL.replace("]", ""); HttpGet get = new HttpGet(getURL); HttpResponse responseGet = client.execute(get); } last_data_collection = System.currentTimeMillis(); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return 0; } } private void postData() { (new postDataTask()).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, ""); } private void updateAverageMPG() { if (!mapValues.containsKey("speed")) return; if (lastTime == 0) { lastTime = System.currentTimeMillis(); return; } double instantMPG = calculateMPG(); double travelMiles = Double.parseDouble(mapValues.get("speed")) * (System.currentTimeMillis() - lastTime) / KILOMETERS_IN_A_MILE / 3600 / 1000; double usedGallons = milesTraveled / instantMPG; lastTime = System.currentTimeMillis(); milesTraveled += travelMiles; gallonsUsed += usedGallons; if (gallonsUsed != 0) { averageMPG = milesTraveled / gallonsUsed; } } public void run() { byte[] buffer = new byte[1024]; int bytes = 0; last_data_collection = System.currentTimeMillis(); // Keep listening to the InputStream while connected while (true) { try { // Read from the InputStream String ln = mmInStreamBuf.readLine(); if (System.currentTimeMillis() - last_data_collection > 12000) { end_game = true; try { HttpClient client = new DefaultHttpClient(); String getURL = "http://www.omnidrive.io/api/?fbid=" + Main.fbid + "&mpgs=" + allMPG.toString().replaceAll("\\s", ""); getURL = getURL.replace("[", ""); getURL = getURL.replace("]", ""); HttpGet get = new HttpGet(getURL); HttpResponse responseGet = client.execute(get); } catch (Exception e) { Log.e(TAG, "FAILURE"); } } if (ln.length() > 6) { try { String header = ln.substring(0, 5); String rest = ln.substring(6).replace(" ", ""); long value = new BigInteger(rest, 16).longValue(); if (header.equals("41 04")) { ln = "Load: " + (value * 100 / 255) + " %"; mapValues.put("engine load", Long.toString(value * 100 / 255)); } else if (header.equals("41 0C")) { ln = "Engine RPM: " + (value / 4) + " rpm"; mapValues.put("rpm", Long.toString(value / 4)); } else if (header.equals("41 0D")) { ln = "Speed: " + value + " kph"; mapValues.put("speed", Long.toString(value)); VSS = value; } else if (header.equals("41 0F")) { ln = "Intake air temperature: " + (value - 40) + " deg C"; mapValues.put("intakeTemp", Long.toString(value - 40)); } else if (header.equals("41 10")) { ln = "MAF: " + (value) + "hundreds of g/s"; MAFval = value; mapValues.put("MAF", Long.toString(value)); } else if (header.equals("41 1F")) { ln = "Runtime seconds: " + (value) + " seconds"; mapValues.put("runSec", Long.toString(value)); } else if (header.equals("41 30")) { ln = "Number of warmups: " + value; mapValues.put("numWarmup", Long.toString(value)); } else if (header.equals("41 33")) { ln = "Barometer: " + value + " kPa"; mapValues.put("baro", Long.toString(value)); } else if (header.equals("41 46")) { ln = "Ambient Temp: " + (value - 40) + " deg C"; mapValues.put("ambTemp", Long.toString(value - 40)); } else if (header.equals("41 49")) { ln = "Throttle: " + (value * 100 / 255) + " %"; mapValues.put("throttle", Long.toString(value * 100 / 255)); updateAverageMPG(); postData(); } } catch (NumberFormatException ignored) { } } buffer = ln.getBytes(); bytes = buffer.length; //System.out.println(ln); //bytes = mmInStream.read(buffer); // Send the obtained bytes to the UI Activity mHandler.obtainMessage(BluetoothChat.MESSAGE_READ, bytes, -1, buffer).sendToTarget(); } catch (IOException e) { Log.e(TAG, "disconnected", e); connectionLost(); // Start the service over to restart listening mode BluetoothChatService.this.start(); break; } } } /** * Write to the connected OutStream. * @param buffer The bytes to write */ public void write(byte[] buffer) { try { byte[] actualBuffer = new byte[buffer.length + 1]; for (int i = 0; i < buffer.length; i++) actualBuffer[i] = buffer[i]; actualBuffer[buffer.length] = 0x0d; mmOutStream.write(actualBuffer); mmOutStream.flush(); // Share the sent message back to the UI Activity //mHandler.obtainMessage(BluetoothChat.MESSAGE_WRITE, -1, -1, buffer) //.sendToTarget(); } catch (IOException e) { Log.e(TAG, "Exception during write", e); } } public void cancel() { try { mmSocket.close(); } catch (IOException e) { Log.e(TAG, "close() of connect socket failed", e); } } } }