[英]Connection is not created (failed or aborted) exception thrown during Bluetooth connection in Android
我正在开发一个项目,该项目使用了一个运行于4.1.2上的android平板电脑(iball 3G 7271),该平板电脑由MTK处理器和RN42蓝牙(PCB上的芯片)制成。这两个模块相互通信以进行传输数据通过蓝牙。
我遇到了问题。在某些情况下,我反复遇到异常,指出``未创建连接(失败或中止)''。我发现了如下所述的实例:
我从PlayStation的BlueTerm应用程序中复制了相关代码,并制作了一个示例应用程序来测试BT连接.Blueterm是一款用于测试设备与RN42之间的蓝牙连接的应用程序。
1)我将应用程序连接到RN42或断开了连接,发现它一直在工作,正在正确连接和断开连接。 2)我模拟了电源故障(仅通过关闭RN42模块),然后断开并重新连接了app和RN42之间的BT连接,发现平板电脑已与RN42重新连接,没有太大问题。
3) 重新安装应用程序与BT连接到RN42之间的链接
测试案例1:在重新安装之前,该应用已与RN42断开连接; 结果-重新安装后,在重新安装的应用程序中BT重新连接到RN42的工作正常。
测试案例2:在重新安装之前,该应用程序已与RN42处于连接状态;结果-在重新安装之后,未发生BT与RN42的重新连接。 我跟踪到测试用例2的异常是:
W/System.err(4603): java.io.IOException: [JSR82] connect: Connection is not created (failed or aborted).
W/System.err(4603): at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:395)
这是几天前我一次又一次收到的异常。所以现在我有点知道何时可以抛出该异常。
注意:对于“测试用例2”,此处甚至卸载并重新安装应用程序然后尝试将应用程序连接到RN42均不起作用。我们需要重新启动平板电脑以使应用程序再次连接到BT。此外,我什至尝试连接真正的BlueTerm应用程序(在测试用例2中),但也没有连接。因此我尝试关闭并打开平板电脑的BT。我观察到先关闭然后再打开BT,然后尝试建立BT平板电脑与RN42之间正在建立连接。但是现在,我没有从RN42到平板电脑的任何输入信号,而是能够将数据从平板电脑发送到RN42。
在Samsung S2 / grand / nexus设备上测试:对于上述测试用例2,在重新安装后,即使重新安装应用程序未通过BT将其连接到RN42,在重新安装后,这些应用程序也确实已连接到BT。
以下是我的应用程序代码和log cat异常:
BlueTerm.java
@SuppressLint("HandlerLeak")
public class BlueTerm extends Activity {
BluetoothSocket Socket;
OutputStream DataOut;
InputStream DataIn;
// Intent request codes
private static final int REQUEST_CONNECT_DEVICE = 1;
private static final int REQUEST_ENABLE_BT = 2;
private static TextView mTitle;
// Name of the connected device
private String mConnectedDeviceName = null;
/**
* Set to true to add debugging code and logging.
*/
public static final boolean DEBUG = 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 = DEBUG && false;
/**
* Set to true to log unknown escape sequences.
*/
public static final boolean LOG_UNKNOWN_ESCAPE_SEQUENCES = DEBUG && false;
/**
* The tag we use when logging, so that our messages can be distinguished
* from other messages in the log. Public because it's used by several
* classes.
*/
public static final String LOG_TAG = "BlueTerm";
// 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;
// Key names received from the BluetoothChatService Handler
public static final String DEVICE_NAME = "device_name";
public static final String TOAST = "toast";
private BluetoothAdapter mBluetoothAdapter = null;
private static BluetoothSerialService mSerialService = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (DEBUG)
Log.e(LOG_TAG, "+++ ON CREATE +++");
setContentView(R.layout.main);
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
mSerialService = new BluetoothSerialService(this, mHandlerBT);
Button buzzerOn = (Button) findViewById(R.id.button1);
buzzerOn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Log.v("BlueTerm","Buzzer button clicked");
//send("37".getBytes());
send(bigIntToByteArray(37));
}
});
Button buzzerOff = (Button) findViewById(R.id.button2);
buzzerOff.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Log.v("BlueTerm","Buzzer button clicked");
//send("37".getBytes());
send(bigIntToByteArray(30));
}
});
Button recon = (Button) findViewById(R.id.button3);
recon.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Log.v("BlueTerm","recon button clicked");
BluetoothAdapter iballAdapter = BluetoothAdapter.getDefaultAdapter();
BluetoothDevice RN42_Device = iballAdapter.getRemoteDevice("00:06:66:49:57:5F");
try {
Socket = RN42_Device.createRfcommSocketToServiceRecord(UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"));
DataOut = Socket.getOutputStream();
DataIn = Socket.getInputStream();
} catch (Exception e1) {
e1.printStackTrace();
}
if (DataIn != null) {
Log.d("AppFunctions","DataIn is not null,so making it NULL");
try {DataIn.close();} catch (Exception e) {}
DataIn = null;
}
Log.i("AppFunctions", "DataOut -" + DataOut);
if (DataOut != null) {
Log.d("AppFunctions","DataOut is not null,so making it NULL");
try {DataOut.close();} catch (Exception e) {}
DataOut = null;
}
Log.i("AppFunctions", "Socket -" + Socket);
if (Socket != null) {
Log.d("AppFunctions","Socket is not null,so making it NULL");
try {Socket.close();} catch (Exception e) {}
Socket = null;
}
try {
Socket = RN42_Device.createRfcommSocketToServiceRecord(UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"));
Socket.connect();
} catch (Exception e) {
e.printStackTrace();
}
if (mSerialService != null)
mSerialService.stop();
mSerialService.start();
}
});
if (DEBUG)
Log.e(LOG_TAG, "+++ DONE IN ON CREATE +++");
}
@Override
public void onStart() {
super.onStart();
if (DEBUG)
Log.e(LOG_TAG, "++ ON START ++");
mEnablingBT = false;
}
@Override
public synchronized void onResume() {
super.onResume();
if (DEBUG) {
Log.e(LOG_TAG, "+ ON RESUME +");
}
if (mSerialService != null) {
Log.v("BlueTerm","mSerialService is NOT null");
// Only if the state is STATE_NONE, do we know that we haven't started already
if (mSerialService.getState() == BluetoothSerialService.STATE_NONE) {
// Start the Bluetooth chat services
Log.v("BlueTerm","starting BT chat service");
mSerialService.start();
}
}
}
}
@Override
public synchronized void onPause() {
super.onPause();
if (DEBUG)
Log.e(LOG_TAG, "- ON PAUSE -");
}
@Override
public void onStop() {
super.onStop();
if(DEBUG)
Log.e(LOG_TAG, "-- ON STOP --");
}
@Override
public void onDestroy() {
super.onDestroy();
if (DEBUG)
Log.e(LOG_TAG, "--- ON DESTROY ---");
if (mSerialService != null)
mSerialService.stop();
}
public int getConnectionState() {
return mSerialService.getState();
}
public void send(byte[] out) {
mSerialService.write( out );
}
// The Handler that gets information back from the BluetoothService
private final Handler mHandlerBT = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MESSAGE_STATE_CHANGE:
if(DEBUG) Log.i(LOG_TAG, "MESSAGE_STATE_CHANGE: " + msg.arg1);
switch (msg.arg1) {
case BluetoothSerialService.STATE_CONNECTED:
break;
case BluetoothSerialService.STATE_CONNECTING:
break;
case BluetoothSerialService.STATE_LISTEN:
case BluetoothSerialService.STATE_NONE:
Log.d("BlueTerm","inside STATE_NONE in handler");
break;
}
break;
case MESSAGE_WRITE:
if (mLocalEcho) {
byte[] writeBuf = (byte[]) msg.obj;
}
break;
case MESSAGE_READ:
byte[] readBuf = (byte[]) msg.obj;
Log.d("incoming writebytes",""+readBuf.toString());
break;
case MESSAGE_DEVICE_NAME:
// save the connected device's name
mConnectedDeviceName = msg.getData().getString(DEVICE_NAME);
Toast.makeText(getApplicationContext(), "Connected to "
+ mConnectedDeviceName, Toast.LENGTH_SHORT).show();
break;
case MESSAGE_TOAST:
Toast.makeText(getApplicationContext(), msg.getData().getString(TOAST),
Toast.LENGTH_SHORT).show();
break;
}
}
};
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if(DEBUG) Log.d(LOG_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 = "00:06:66:49:57:5F";
// Get the BLuetoothDevice object
BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
// Attempt to connect to the device
mSerialService.connect(device);
}
break;
case REQUEST_ENABLE_BT:
// When the request to enable Bluetooth returns
if (resultCode == Activity.RESULT_OK) {
Log.d(LOG_TAG, "BT not enabled");
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.option_menu, menu);
mMenuItemConnect = menu.getItem(0);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.connect:
if (getConnectionState() == BluetoothSerialService.STATE_NONE) {
String address = "00:06:66:49:57:5F";
// Get the BLuetoothDevice object
BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
Log.d("BlueTerm","device: " + device);
// Attempt to connect to the device
mSerialService.connect(device);
}
else
if (getConnectionState() == BluetoothSerialService.STATE_CONNECTED) {
mSerialService.stop();
mSerialService.start();
}
return true;
case R.id.preferences:
//doPreferences();
return true;
case R.id.menu_special_keys:
//doDocumentKeys();
return true;
}
return false;
}
private byte[] bigIntToByteArray( final int i ) {
BigInteger bigInt = BigInteger.valueOf(i);
return bigInt.toByteArray();
}
}
蓝牙服务:
/**
* 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 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;
// 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) {
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
*/
private synchronized void setState(int state) {
if (D) Log.d(TAG, "setState() " + mState + " -> " + state);
mState = state;
Log.d("BluetoothSerialService","state : " + state);
// Give the new state to the Handler so the UI Activity can update
mHandler.obtainMessage(BlueTerm.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) {
Log.e("BluetoothSerialService","Inside write fn" + " :" + out.toString());
// 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.
*/
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(SerialPortServiceClass_UUID);
} catch (IOException e) {
Log.e(TAG, "create() failed", e);
}
mmSocket = tmp;
}
public void run() {
Log.e(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.
*/
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket) {
Log.e(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.e(TAG, "BEGIN mConnectedThread");
byte[] buffer = new byte[1024];
int bytes;
// Keep listening to the InputStream while connected
Log.e(TAG, "Entering while");
while (true) {
Log.e(TAG, "Inside while");
try {
// Read from the InputStream
bytes = 0;
Log.d("incoming bytes",""+bytes);
Log.e("BT","Inputstream :" + mmInStream);
//bytes = mmInStream.read(buffer);
bytes = mmInStream.read();
Log.d("incoming bytes",""+bytes);
//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 (Exception e) {
Log.e(TAG, "disconnected", e);
connectionLost();
break;
}
bytes = 0;
}
//Log.e(TAG, "Outside while");
}
/**
* Write to the connected OutStream.
* @param buffer The bytes to write
*/
public void write(byte[] buffer) {
try {
Log.d("writing to outStream byte :", buffer.toString());
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 (Exception e) {
Log.e(TAG, "close() of connect socket failed", e);
}
}
}
}
Logcat错误:
W / System.err(4603):java.io.IOException:[JSR82] connect:未创建连接(失败或中止)。 W / System.err(4603):位于android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:395)
我怀疑可能会引发此错误,因为在上述测试案例中,该应用无法访问活动的BT端口。原因是因为我阅读了以下站点: https : //code.google.com/p/ android / issues / detail?id = 5427 (请参阅dknop的答案#19)我观察到在我测试过的三星s2 / grand / nexus设备上均未发生此问题。我的错误也可能是由于MTK处理器/它的BT固件/ iball自定义android问题。( http://redacacia.me/2012/07/17/overcoming-android-bluetooth-blues-with-reflection-method/ )
有没有人遇到过类似的问题? 任何帮助将不胜感激。非常感谢!
我已经在数十种不同的平板电脑上测试了蓝牙连接性,并且看到了一些非常不稳定的行为。 我的应用程序总是在循环中调用createRfcommSocketToServiceRecord(...)
,因为有时它会由于没有明显的原因而失败,仅在以后的尝试中成功。 而且,API不允许您区分暂时性故障和永久性故障。 有些平板电脑会在错误消息的文本中为您提供线索,而其他平板电脑则不会。
我通常尝试以100ms的间隔连接100次,然后停止并询问用户他们尝试连接的设备是否已打开并且在范围内。 在我测试过的一种特定的平板电脑型号上,连接失败超过300次并不罕见……然后它会突然工作,好像没有任何错误。
我已经使用这段代码来使我与蓝牙设备(即蓝牙打印机)的连接稳定。 现在,它连接10次有9.9次连接。如果仍然出现错误,我将以编程方式再次重置我的蓝牙,再次调用此代码,然后连接10次有10次连接。
public boolean connectToPrinter(String printerName) throws IOException
{
BluetoothAdapter.getDefaultAdapter().cancelDiscovery();
BluetoothDevice device = getPrinterByName(printerName);
if (bluetoothSocket != null)
{
bluetoothSocket.close();
}
try {
Method m=device.getClass().getMethod("createRfcommSocket", new Class[]{int.class});
bluetoothSocket= (BluetoothSocket) m.invoke(device, 1);
} catch (Exception e) {
e.printStackTrace();
}
if (bluetoothSocket == null)
return false;
bluetoothSocket.connect();
return true;
}
这是getPrinterByName()的代码:
private BluetoothDevice getPrinterByName(String printerName)
{
Set<BluetoothDevice> pairedDevices = BluetoothAdapter.getDefaultAdapter().getBondedDevices();
for (BluetoothDevice device : pairedDevices)
{
Log.e("","device name: "+device.getName());
if (device.getName() == null)
continue;
if (device.getName().contains(printerName))
{
remoteDevice = device;
// pairPrinter(printerName);
return remoteDevice;
}
}
return null;
}
bluetoothSocket是BluetoothSocket类的Object。 并且不要忘记在线程中运行此代码,否则将阻塞您的主线程。 :-)
嗨,朋友,只需使用反射将代码替换为连接到蓝牙套接字的代码即可建立连接.....
private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
if(Build.VERSION.SDK_INT >= 10){
try {
final Method m = device.getClass().getMethod("createInsecureRfcommSocketToServiceRecord", new Class[] { UUID.class });
return (BluetoothSocket) m.invoke(device, MY_UUID);
} catch (Exception e) {
Log.e(TAG, "Could not create Insecure RFComm Connection",e);
}
}
return device.createRfcommSocketToServiceRecord(MY_UUID);
}
Quote:我观察到通过关闭BT然后再打开BT,然后试图在平板电脑和RN42之间建立BT连接的方式发生了。但是现在,我没有从RN42到平板电脑的任何输入信号,但是能够发送数据从平板电脑到RN42。
因此,在重新安装应用程序之前,是否有可能从rn42接收输入信号?
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