我正在创建一个程序，用于通过平板电脑/手机连接到嵌入式蓝牙设备。我的代码主要由我得到和发现的不同代码组成。处理蓝牙设备连接的代码主要来自BlueTerm程序的源代码。我试图消除对给定类之一的需要，并开始遇到一些我不知道如何修复的错误。这是我开始活动的代码：
public class AndroidBluetooth extends Activity {
/** Called when the activity is first created. */
private static BluetoothAdapter myBtAdapter;
private static BluetoothDevice myBtDevice;
private ArrayAdapter<String> btArrayAdapter;
private ArrayList<BluetoothDevice> btDevicesFound = new ArrayList<BluetoothDevice>();
private Button btnScanDevice;
private TextView stateBluetooth;
private ListView listDevicesFound;
private InputStream iStream;
private OutputStream oStream;
private BluetoothSocket btSocket;
private String newDeviceAddress;
private BroadcastReceiver mReceiver;
private static BluetoothSerialService mSerialService = null;
// Intent request codes
private static final int REQUEST_CONNECT_DEVICE = 1;
private static TextView mTitle;
// Message types sent from the BluetoothReadService Handler
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;
// Name of the connected device
private String mConnectedDeviceName = null;
/**
* Set to true to add debugging code and logging.
*/
public static final boolean D = true;
/**
* Set to true to log each character received from the remote process to the
* android log, which makes it easier to debug some kinds of problems with
* emulating escape sequences and control codes.
*/
public static final boolean LOG_CHARACTERS_FLAG = D && false;
/**
* Set to true to log unknown escape sequences.
*/
public static final boolean LOG_UNKNOWN_ESCAPE_SEQUENCES = D && false;
private static final String TAG = "ANDROID BLUETOOTH";
private static final int REQUEST_ENABLE_BT = 2;
// Member fields
//private final Handler mHandler;
private ConnectThread mConnectThread;
private ConnectedThread mConnectedThread;
private int mState;
//private EmulatorView mEmulatorView;
// 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 int currentState;
public boolean customTitleSupported;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
currentState = 0;
customTitleSupported = requestWindowFeature( Window.FEATURE_CUSTOM_TITLE );
// Set up window View
setContentView(R.layout.main);
stateBluetooth = new TextView(this);
myBtAdapter = null;
startBluetooth();
CheckBlueToothState();
customTitleBar( getText( R.string.app_name).toString(), stateBluetooth.getText().toString() );
}
public void customTitleBar( String left, String right ) {
if( right.length() > 30 ) right = right.substring( 0, 20 );
if( customTitleSupported ) {
getWindow().setFeatureInt( Window.FEATURE_CUSTOM_TITLE, R.layout.customlayoutbar );
TextView titleTvLeft = (TextView) findViewById( R.id.titleTvLeft );
TextView titleTvRight = (TextView) findViewById( R.id.titleTvRight );
titleTvLeft.setText( left );
titleTvRight.setText( right );
}
}
public boolean onCreateOptionsMenu( Menu menu ) {
MenuInflater inflater = getMenuInflater();
inflater.inflate( R.menu.option_menu, menu );
return true;
}
public boolean onOptionsItemSelected( MenuItem item ) {
switch( item.getItemId() ) {
case R.id.connect:
startActivityForResult( new Intent( this, DeviceList.class ), REQUEST_CONNECT_DEVICE );
return true;
case R.id.preferences:
return true;
default:
return super.onContextItemSelected( item );
}
}
private void CheckBlueToothState() {
if( myBtAdapter == null ) {
stateBluetooth.setText("Bluetooth NOT supported" );
} else {
if( myBtAdapter.isEnabled() ) {
if( myBtAdapter.isDiscovering() ) {
stateBluetooth.setText( "Bluetooth is currently " +
"in device discovery process." );
} else {
stateBluetooth.setText( "Bluetooth is Enabled." );
}
} else {
stateBluetooth.setText( "Bluetooth is NOT enabled" );
Intent enableBtIntent = new Intent( BluetoothAdapter.ACTION_REQUEST_ENABLE );
startActivityForResult( enableBtIntent, REQUEST_ENABLE_BT );
}
}
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if(D) Log.d( TAG, "onActivityResult " + resultCode);
switch (requestCode) {
case REQUEST_CONNECT_DEVICE:
// When DeviceListActivity returns with a device to connect
if (resultCode == Activity.RESULT_OK) {
// Get the device MAC address
String address = data.getExtras()
.getString(DeviceList.EXTRA_DEVICE_ADDRESS);
// Get the BLuetoothDevice object
BluetoothDevice device = myBtAdapter.getRemoteDevice(address);
// Attempt to connect to the device
connect(device);
}
break;
case REQUEST_ENABLE_BT:
// When the request to enable Bluetooth returns
CheckBlueToothState();
}
}
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();
mSerialService.setState(STATE_CONNECTING);
}
//In SDK15 (4.0.3) this method is now public as
//Bluetooth.fetchUuisWithSdp() and BluetoothDevice.getUuids()
public ParcelUuid[] servicesFromDevice(BluetoothDevice device) {
try {
Class cl = Class.forName("android.bluetooth.BluetoothDevice");
Class[] par = {};
Method method = cl.getMethod("getUuids", par);
Object[] args = {};
ParcelUuid[] retval = (ParcelUuid[]) method.invoke(device, args);
return retval;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
private final BroadcastReceiver ActionFoundReceiver = new BroadcastReceiver() {
public void onReceive( Context context, Intent intent ) {
String action = intent.getAction();
if( BluetoothDevice.ACTION_FOUND.equals( action ) ) {
BluetoothDevice btDevice = intent.getParcelableExtra( BluetoothDevice.EXTRA_DEVICE );
btDevicesFound.add( btDevice );
btArrayAdapter.add( btDevice.getName() + "\n" + btDevice.getAddress() );
btArrayAdapter.notifyDataSetChanged();
}
}
};
public static void startBluetooth(){
try {
myBtAdapter = BluetoothAdapter.getDefaultAdapter();
myBtAdapter.enable();
} catch ( NullPointerException ex ) {
Log.e( "Bluetooth", "Device not available" );
}
}
public static void stopBluetooth() {
myBtAdapter.disable();
}
}
从底部开始，该方法中大约有三十行connect()是发生错误的地方。该行 mConnectThread = new ConnectThread( device ); 带有下划线，错误消息如下：
无法访问 BluetoothSerialService 类型的封闭实例。必须使用 BluetoothSerialService 类型的封闭实例来限定分配（例如 xnew A()，其中 x 是 BluetoothSerialService 的实例）。
这是我目前拥有的 BluetoothSerialService 代码：
public class BluetoothSerialService {
// Debugging
private static final String TAG = "BluetoothReadService";
private static final boolean D = true;
private static final UUID SerialPortServiceClass_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
// Member fields
private final BluetoothAdapter mAdapter;
private final Handler mHandler;
private ConnectThread mConnectThread;
private ConnectedThread mConnectedThread;
private int mState;
//private EmulatorView mEmulatorView;
// 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 BluetoothSerialService(Context context, Handler handler ) { //EmulatorView emulatorView) {
mAdapter = BluetoothAdapter.getDefaultAdapter();
mState = STATE_NONE;
mHandler = handler;
//mEmulatorView = emulatorView;
}
/**
* Set the current state of the chat connection
* @param state An integer defining the current connection state
*/
public 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(AndroidBluetooth.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() {
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_NONE);
}
/**
* 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(BlueTerm.MESSAGE_DEVICE_NAME);
Bundle bundle = new Bundle();
//bundle.putString(BlueTerm.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);
}
/**
* 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(BlueTerm.MESSAGE_TOAST);
Bundle bundle = new Bundle();
//bundle.putString(BlueTerm.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(BlueTerm.MESSAGE_TOAST);
Bundle bundle = new Bundle();
//bundle.putString(BlueTerm.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.
*/
public 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(SerialPortServiceClass_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
//BluetoothSerialService.this.start();
return;
}
// Reset the ConnectThread because we're done
synchronized (BluetoothSerialService.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.
*/
public 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;
}
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);
//mEmulatorView.write(buffer, bytes);
// Send the obtained bytes to the UI Activity
//mHandler.obtainMessage(BlueTerm.MESSAGE_READ, bytes, -1, buffer).sendToTarget();
String a = buffer.toString();
a = "";
} catch (IOException e) {
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(BlueTerm.MESSAGE_WRITE, buffer.length, -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);
}
}
}
}