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/* * Copyright (C) 2009 The Android Open Source Project */* ww w. jav a 2s . co 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 transmission; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.bluetooth.BluetoothSocket; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.util.Log; import userinterface.BluetoothViewer; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.util.UUID; /** * 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; // 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 final Handler mHandler; private ConnectThread mConnectThread; private ConnectedThread mConnectedThread; private int mState; private static int mStarter = 0; // Constants that indicate the current connection state public static final int STATE_NONE = 0; // we're doing nothing 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 handler A Handler to send messages back to the UI Activity */ public BluetoothChatService(Handler handler) { mAdapter = BluetoothAdapter.getDefaultAdapter(); mState = STATE_NONE; mHandler = handler; } /** * Set the current state of the chat 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(BluetoothViewer.MESSAGE_STATE_CHANGE, state, -1).sendToTarget(); } /** * Return the current connection state. */ public synchronized int getState() { return mState; } /** * 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 try { mConnectThread = new ConnectThread(device); mConnectThread.start(); setState(STATE_CONNECTING); } catch (SecurityException e) { e.printStackTrace(); } catch (IllegalArgumentException e) { e.printStackTrace(); } catch (NoSuchMethodException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } } /** * 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(BluetoothViewer.MESSAGE_DEVICE_NAME); Bundle bundle = new Bundle(); bundle.putString(BluetoothViewer.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 (mConnectedThread != null) mConnectedThread.shutdown(); if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;} if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = 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); } /** * Indicate that the connection attempt failed and notify the UI Activity. */ private void connectionFailed() { setState(STATE_NONE); // Send a failure message back to the Activity Message msg = mHandler.obtainMessage(BluetoothViewer.MESSAGE_TOAST); Bundle bundle = new Bundle(); bundle.putString(BluetoothViewer.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_NONE); // Send a failure message back to the Activity Message msg = mHandler.obtainMessage(BluetoothViewer.MESSAGE_TOAST); Bundle bundle = new Bundle(); bundle.putString(BluetoothViewer.TOAST, "Device connection was lost"); msg.setData(bundle); mHandler.sendMessage(msg); } /** * 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) throws SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException { mmDevice = device; BluetoothSocket tmp = null; // Get a BluetoothSocket for a connection with the // given BluetoothDevice try { tmp = device.createRfcommSocketToServiceRecord(MY_UUID); Method m = device.getClass().getMethod("createRfcommSocket", new Class[] {int.class}); tmp = (BluetoothSocket) m.invoke(device, 1); } 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) { e.printStackTrace(); connectionFailed(); // Close the socket try { mmSocket.close(); } catch (IOException e2) { Log.e(TAG, "unable to close() socket during connection failure", e2); } return; } // Reset the ConnectThread because we're done synchronized (BluetoothChatService.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 and outgoing transmissions. */ private class ConnectedThread extends Thread { private final BluetoothSocket mmSocket; private final InputStream mmInStream; private final OutputStream mmOutStream; public ConnectedThread(BluetoothSocket socket) { Log.d(TAG, "create ConnectedThread"); 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; } private boolean stop = false; private boolean hasReadAnything = false; public void shutdown() { stop = true; if (! hasReadAnything) return; if (mmInStream != null) { try { mmInStream.close(); } catch (IOException e) { Log.e(TAG, "close() of InputStream failed."); } } } public void run() { Log.i(TAG, "BEGIN mConnectedThread"); //BufferedReader reader = new BufferedReader(new InputStreamReader(mmInStream)); //InputStreamReader isr = new InputStreamReader(mmInStream); byte[] bt = new byte[20]; int bytes; while (! stop) { try { // String line = reader.readLine(); if (mmInStream.available() >= 20) { bytes = mmInStream.read(bt); // for (int i=0;i<20;i++) { // System.out.print(bt[i]); System.out.print(" "); // } // System.out.print("\n"); mHandler.obtainMessage(BluetoothViewer.MESSAGE_READ, bytes, -1, bt).sendToTarget(); } // insert "0" to recover the data loss //////////////////////////////////////// //mHandler.obtainMe6ssage(BluetoothViewer.MESSAGE_READ, bytes, -1, bt).sendToTarget(); //if (mmInStream.available() > 20) { // mmInStream.read(bt, 0, 20); //} //byte bt = (byte)isr.read(); /*if (line != null) { mHandler.obtainMessage(BluetoothViewer.MESSAGE_READ, line.length(), -1, line.getBytes()) .sendToTarget(); } */ //mHandler.obtainMessage(BluetoothViewer.MESSAGE_READ, 1, -1, Byte.toString(bt[0])).sendToTarget(); //mHandler.obtainMessage(BluetoothViewer.MESSAGE_READ, 1, -1, bt).sendToTarget(); } catch (IOException e) { e.printStackTrace(); Log.e(TAG, "disconnected", e); connectionLost(); break; } } } /** * Write to the connected OutStream. * @param buffer The bytes to write */ public void write(byte[] buffer) { try { mmOutStream.write(buffer); // Share the sent message back to the UI Activity mHandler.obtainMessage(BluetoothViewer.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); } } } }