我尝试使用 Phonegap 为 Android 开发一个简约的蓝牙聊天。该插件基于 BluetoothChat 的 Android SDK 示例，如示例代码中所示。
native 蓝牙聊天工作正常。 问题是，当我调用“write”函数时，尽管已建立连接，但“ConnectedThread”始终为空。
在 State 设置为 3 (STATE_CONNECTED) 后，我无法识别它在哪里再次设置为 null。
所以当我在android上运行 native 程序时，它工作正常并且写入期间的状态始终为3，但是当我使用我的phonegap插件'r'(ConnectedThread)时变为null:
public void write(byte[] out) {
// Create temporary object
ConnectedThread r;
// Synchronize a copy of the ConnectedThread
synchronized (this) {
Log.i(TAG, "State "+mState);
if (mState != STATE_CONNECTED) return;
Log.i(TAG, "Connected Thread "+mConnectedThread);
r = mConnectedThread;
}
// Perform the write unsynchronized
r.write(out);
}
我使用了很多调试消息，但我从未被告知状态再次为空。
完整源代码:
PLUGIN.java
public class BluetoothConnection extends CordovaPlugin {
//Android specific tag-messages
private static final String TAG ="BluetoothConnection";
private static final boolean D = true;
// Member-Variables
public BluetoothAdapter mBluetoothAdapter;
public JSONArray mListOfDiscoveredDevices;
public String mConnectedDeviceName;
public ConnectionHandler mConnectionHandler;
// Phonegap-specific actions, which call the function
public String ACTION_ENABLEBLUETOOTH = "enableBluetooth";
public String ACTION_DISABLEBLUETOOTH = "disableBluetooth";
public String ACTION_DISCOVERDECIVES = "discoverDevices";
public String ACTION_STOPDISCOVERDEVICES = "stopDiscoverDevices";
public String ACTION_CREATEBOND = "createBond";
public String ACTION_WRITEMESSAGE = "writeMessage";
// not usable, this moment
public String ACTION_DISCONNECT = "disconnect";
//Message types sent from the ConnectionHandler
public static final int MESSAGE_STATE_CHANGE = 1;
public static final int MESSAGE_READ = 2;
public static final int MESSAGE_WRITE = 3;
public static final int MESSAGE_DEVICE_NAME = 4;
public static final int MESSAGE_TOAST = 5;
public static final String DEVICE_NAME = "device_name";
public static final String TOAST = "toast";
@Override
public boolean execute(String action, JSONArray args,
CallbackContext callbackContext) throws JSONException {
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter.equals(null)) {
Log.i(TAG, "no adapter was found");
}
mConnectionHandler = new ConnectionHandler(mHandler);
if (action.equals(ACTION_ENABLEBLUETOOTH)) {
enableBluetooth();
}
else if (action.equals(ACTION_DISABLEBLUETOOTH)) {
disableBluetooth();
}
else if (action.equals(ACTION_DISCOVERDECIVES)) {
discoverDevices();
}
else if (action.equals(ACTION_STOPDISCOVERDEVICES)) {
stopDiscovering(callbackContext);
}
else if (action.equals(ACTION_CREATEBOND)) {
try {
BluetoothDevice remoteBtDevice = createBond(args, callbackContext);
connect(remoteBtDevice, callbackContext);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else if(action.equals(ACTION_WRITEMESSAGE)){
writeMessage(args.getString(0));
}
else if (action.equals(ACTION_DISCONNECT)) {
disconnect();
}
return false;
}
public void enableBluetooth() {
if (!mBluetoothAdapter.equals(null)) {
mBluetoothAdapter.enable();
Log.i(TAG, "bluetooth on");
}
}
public void disableBluetooth() {
if (mBluetoothAdapter.isEnabled()) {
mBluetoothAdapter.disable();
Log.i(TAG, "bluetooth off");
}
}
public void discoverDevices() {
mListOfDiscoveredDevices = new JSONArray();
Log.i("Log", "in the start searching method");
IntentFilter intentFilter = new IntentFilter(
BluetoothDevice.ACTION_FOUND);
cordova.getActivity().registerReceiver(mFoundDevices, intentFilter);
mBluetoothAdapter.startDiscovery();
}
private void stopDiscovering(CallbackContext callbackContext) {
if (mBluetoothAdapter.isDiscovering()) {
mBluetoothAdapter.cancelDiscovery();
}
PluginResult res = new PluginResult(PluginResult.Status.OK,
mListOfDiscoveredDevices);
res.setKeepCallback(true);
callbackContext.sendPluginResult(res);
Log.i("Info", "Stopped discovering Devices !");
}
public BluetoothDevice createBond(JSONArray args, CallbackContext callbackContext) throws Exception {
String macAddress = args.getString(0);
Log.i(TAG, "Connect to MacAddress "+macAddress);
BluetoothDevice btDevice = mBluetoothAdapter.getRemoteDevice(macAddress);
Log.i("Device","Device "+btDevice);
Class class1 = Class.forName("android.bluetooth.BluetoothDevice");
Method createBondMethod = class1.getMethod("createBond");
Boolean returnValue = (Boolean) createBondMethod.invoke(btDevice);
if(btDevice.equals(null))
throw new NullPointerException("Remote BluetoothDevice could not be paired !");
return btDevice;
}
public void removeBond(BluetoothDevice btDevice) throws Exception {
Class btClass = Class.forName("android.bluetooth.BluetoothDevice");
Method removeBondMethod = btClass.getMethod("removeBond");
Boolean returnValue = (Boolean) removeBondMethod.invoke(btDevice);
}
public void connect(BluetoothDevice btDevice, CallbackContext callbackContext) {
if(!btDevice.equals(null)){
mConnectionHandler.connect(btDevice, false);
PluginResult result = new PluginResult(PluginResult.Status.NO_RESULT);
result.setKeepCallback(true);
callbackContext.sendPluginResult(result);
Log.i(TAG, "Status after connecting "+mConnectionHandler.getState());
}
else {
callbackContext.error("Could not connect to "+btDevice.getAddress());
}
}
public void disconnect(){
}
public void writeMessage(String message){
if(mConnectionHandler.getState() != ConnectionHandler.STATE_CONNECTED){
Log.i(TAG, "Could not write to device");
Log.i(TAG, "State "+mConnectionHandler.getState());
}
if(message.length() > 0) {
byte[] send = message.getBytes();
mConnectionHandler.write(send);
Log.i(TAG, "sending "+message);
}
else {
Log.i(TAG, "There is nothing to send.");
}
}
private BroadcastReceiver mFoundDevices = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Message msg = Message.obtain();
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
Toast.makeText(context, "found Device !", Toast.LENGTH_SHORT).show();
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
Log.i("FOUND", "Name " + device.getName() + "-" + device.getAddress());
JSONObject discoveredDevice = new JSONObject();
try {
discoveredDevice.put("name", device.getName());
discoveredDevice.put("adress", device.getAddress());
if (!isJSONInArray(discoveredDevice)) {
mListOfDiscoveredDevices.put(discoveredDevice);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
};
private 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 ConnectionHandler.STATE_CONNECTED:
Log.i(TAG, "ConnectionHandler.STATE_CONNECTED !");
break;
case ConnectionHandler.STATE_CONNECTING:
Log.i(TAG, "ConnectionHandler.STATE_CONNECTING !");
break;
case ConnectionHandler.STATE_LISTEN:
Log.i(TAG, "ConnectionHandler.STATE_LISTEN !");
break;
case ConnectionHandler.STATE_NONE:
Log.i(TAG, "ConnectionHandler.STATE_NONE !");
break;
}
break;
case MESSAGE_WRITE:
byte[] writeBuf = (byte[]) msg.obj;
// construct a string from the buffer
String writeMessage = new String(writeBuf);
Log.i(TAG, "Write "+writeMessage);
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);
Log.i(TAG, "Read "+readMessage);
break;
case MESSAGE_DEVICE_NAME:
// save the connected device's name
mConnectedDeviceName = msg.getData().getString(DEVICE_NAME);
Log.i(TAG, mConnectedDeviceName);
break;
case MESSAGE_TOAST:
String message = msg.getData().getString(TOAST);
Log.i(TAG, "Connection lost : " +message);
break;
}
}
};}
连接处理程序
public class ConnectionHandler {
// 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
private static final UUID MY_UUID_SECURE =
UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
private 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;
// 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
public ConnectionHandler(Handler handler) {
mAdapter = BluetoothAdapter.getDefaultAdapter();
mState = STATE_NONE;
mHandler = handler;
}
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(BluetoothConnection.MESSAGE_STATE_CHANGE, state, -1).sendToTarget();
}
public synchronized int getState() {
return mState;
}
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 thread to listen on a BluetoothServerSocket
if (mSecureAcceptThread == null) {
mSecureAcceptThread = new AcceptThread(true);
mSecureAcceptThread.start();
}
if (mInsecureAcceptThread == null) {
mInsecureAcceptThread = new AcceptThread(false);
mInsecureAcceptThread.start();
}
}
public synchronized void connect(BluetoothDevice device, boolean secure) {
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, secure);
mConnectThread.start();
setState(STATE_CONNECTING);
}
public synchronized void connected(BluetoothSocket socket, BluetoothDevice
device, final String socketType) {
if (D) Log.d(TAG, "connected, Socket Type:" + 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(BluetoothConnection.MESSAGE_DEVICE_NAME);
Bundle bundle = new Bundle();
bundle.putString(BluetoothConnection.DEVICE_NAME, device.getName());
msg.setData(bundle);
mHandler.sendMessage(msg);
setState(STATE_CONNECTED);
}
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);
}
public void write(byte[] out) {
// Create temporary object
ConnectedThread r;
// Synchronize a copy of the ConnectedThread
synchronized (this) {
Log.i(TAG, "State "+mState);
if (mState != STATE_CONNECTED) return;
Log.i(TAG, "Connected Thread "+mConnectedThread);
r = mConnectedThread;
}
// Perform the write unsynchronized
r.write(out);
}
private void connectionFailed() {
// Send a failure message back to the Activity
Message msg = mHandler.obtainMessage(BluetoothConnection.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString(BluetoothConnection.TOAST, "Unable to connect device");
msg.setData(bundle);
mHandler.sendMessage(msg);
// Start the service over to restart listening mode
ConnectionHandler.this.start();
}
private void connectionLost() {
// Send a failure message back to the Activity
Message msg = mHandler.obtainMessage(BluetoothConnection.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString(BluetoothConnection.TOAST, "Device connection was lost");
msg.setData(bundle);
mHandler.sendMessage(msg);
// Start the service over to restart listening mode
ConnectionHandler.this.start();
}
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() {
if (D) Log.d(TAG, "Socket Type: " + mSocketType +
"BEGIN mAcceptThread" + this);
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 (ConnectionHandler.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;
}
}
}
}
if (D) Log.i(TAG, "END mAcceptThread, socket Type: " + mSocketType);
}
public void cancel() {
if (D) Log.d(TAG, "Socket Type" + mSocketType + "cancel " + this);
try {
mmServerSocket.close();
} catch (IOException e) {
Log.e(TAG, "Socket Type" + mSocketType + "close() of server failed", e);
}
}
}
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 {
if (secure) {
tmp = device.createRfcommSocketToServiceRecord(
MY_UUID_SECURE);
} else {
tmp = device.createInsecureRfcommSocketToServiceRecord(
MY_UUID_INSECURE);
}
} catch (IOException e) {
Log.e(TAG, "Socket Type: " + mSocketType + "create() failed", e);
}
mmSocket = tmp;
}
public void run() {
Log.i(TAG, "BEGIN mConnectThread SocketType:" + mSocketType);
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();
} catch (IOException e) {
// Close the socket
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 (ConnectionHandler.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);
}
}
}
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket, String socketType) {
Log.d(TAG, "create ConnectedThread: " + 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;
}
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(BluetoothConnection.MESSAGE_READ, bytes, -1, buffer)
.sendToTarget();
} catch (IOException e) {
Log.e(TAG, "disconnected", e);
connectionLost();
// Start the service over to restart listening mode
ConnectionHandler.this.start();
break;
}
}
}
public void write(byte[] buffer) {
try {
mmOutStream.write(buffer);
// Share the sent message back to the UI Activity
mHandler.obtainMessage(BluetoothConnection.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);
}
}
}}
谢谢!!!
最佳答案
我在一个新项目中再次实现 - 现在它可以工作了，不知道为什么 - 但它现在可以工作了。
关于java - 电话间隙 : BluetoothChatExample [Android]，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/21072148/