我尝试按如下方式设置蓝牙连接：
private class ConnectThread extends Thread {
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;
BluetoothSocket connection = null;
public ConnectThread(BluetoothDevice device) {
mmDevice = device;
// Get a BluetoothSocket for a connection with the
// given BluetoothDevice
try {
if(D) Log.i(TAG, "createRfcommSocket");
Method m = mmDevice.getClass().getMethod("createRfcommSocket",new Class[] { int.class });
connection = (BluetoothSocket) m.invoke(mmDevice, 1);
Utils.pause(100);
} catch (Exception e) {
Log.e(TAG, "create() failed", e);
}
if(D) Log.i(TAG,"Bluetooth socket initialised");
mmSocket = connection;
}
public void run() {
if(D) Log.i(TAG, "BEGIN mConnectThread on Device : " + mmDevice);
setName("ConnectThread");
if (mmSocket != null) {
// Always cancel discovery because it will slow down a connection
if(mAdapter.isDiscovering()) {
if(D) Log.i(TAG, "stop discovering before trying to connect");
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
if(D) Log.i(TAG, "start Bluetooth socket connection");
mmSocket.connect();
if(D) Log.i(TAG, "end of Bluetooth socket connection");
} catch (Exception e1) {
Log.e(TAG, "connect failed", e1);
connectionFailed();
// Reset the socket
resetConnection(mmSocket);
// Start the service over to restart listening mode
if(D) Log.i(TAG, "restart connection");
BluetoothConnectionService.this.start();
if(D) Log.i(TAG, "return");
return;
}
// Start the connected thread
if(D) Log.i(TAG, "The device is considered as connected, call connected thread");
connected(mmSocket, mmDevice);
} else {
if(D) Log.i(TAG, "connection fail");
connectionFailed();
BluetoothConnectionService.this.start();
}
}
public void cancel() {
if(D) Log.i(TAG,"connect thread cancel");
resetConnection(mmSocket);
}
}
连接似乎没问题，我得到了这个日志：
DEBUG/BluetoothConnectionService(3439): **connect to: 00:18:E4:21:8B:5E**
INFO/BluetoothConnectionService(3439): createRfcommSocket
INFO/BluetoothConnectionService(3439): Bluetooth socket initialised
INFO/BluetoothConnectionService(3439): BEGIN mConnectThread on Device : 00:18:E4:21:8B:5E
INFO/BluetoothConnectionService(3439): **start Bluetooth socket connection**
INFO/BluetoothConnectionService(3439): setState() 1 -> 2
INFO/ProtectionService(3439): MESSAGE_STATE_CHANGE: 1
DEBUG/ProtectionService(3439): STATE_CHANGED to STATE_LISTEN
INFO/ProtectionService(3439): MESSAGE_STATE_CHANGE: 2
DEBUG/abtfilt(2772): **Conn complete**
INFO/bluetoothd(2776): link_key_request (sba=24:21:AB:F4:69:25, dba=00:18:E4:21:8B:5E)
INFO/bluetoothd(2776): link_key_request (sba=24:21:AB:F4:69:25, dba=00:18:E4:21:8B:5E)
INFO/BluetoothConnectionService(3439): **end of Bluetooth socket connection**
INFO/BluetoothConnectionService(3439): **The device is considered as connected, call connected thread**
BluetoothSocket.connect()无误地返回。
然后我用这个来管理连接：
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket) {
if(D) Log.d(TAG, "create ConnectedThread");
mmSocket = socket;
// Get the BluetoothSocket input and output streams
try {
if(D) Log.i(TAG, "Get input stream");
tmpIn = socket.getInputStream();
if(D) Log.i(TAG, "Get output stream");
tmpOut = socket.getOutputStream();
if(D) Log.i(TAG, "isConnected = true");
isConnected = true;
} catch (IOException e) {
Log.e(TAG, "Input and Output sockets not created", e);
isConnected = false;
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
if(D) Log.i(TAG, "BEGIN mConnectedThread");
byte[] buffer = new byte[1024]; //buffer store for the stream
int bytes; //bytes returned from read()
// Keep listening to the InputStream until an exception occurs
while(true) {
try {
// Read from the InputStream
if(D) Log.i(TAG, "start read mmInStream");
bytes = mmInStream.read(buffer);
if(D) Log.i(TAG, "Bytes read : "+bytes);
// Send the obtained bytes to the UI Activity
mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer).sendToTarget();
} catch (IOException e) {
Log.e(TAG, "ConnectedThread : disconnected", e);
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(MESSAGE_WRITE, -1, -1, buffer).sendToTarget();
// mmOutStream.flush();
} catch (IOException e) {
Log.e(TAG, "Exception during write", e);
connectionFailed();
}
}
public void cancel() {
if(D) Log.i(TAG,"connected Thread cancel");
resetConnection(mmSocket);
}
}
我收到此错误：
DEBUG/BluetoothConnectionService(3439): create ConnectedThread
INFO/BluetoothConnectionService(3439): Get input stream
INFO/BluetoothConnectionService(3439): Get output stream
INFO/BluetoothConnectionService(3439): isConnected = true
INFO/BluetoothConnectionService(3439): BEGIN mConnectedThread
INFO/BluetoothConnectionService(3439): start read mmInStream
INFO/BluetoothConnectionService(3439): setState() 2 -> 3
INFO/ProtectionService(3439): MESSAGE_STATE_CHANGE: 3
DEBUG/ProtectionService(3439): connectionEstablished
**ERROR/BluetoothConnectionService(3439): ConnectedThread : disconnected
ERROR/BluetoothConnectionService(3439): java.io.IOException: Software caused connection abort
ERROR/BluetoothConnectionService(3439): at android.bluetooth.BluetoothSocket.readNative(Native Method)
ERROR/BluetoothConnectionService(3439): at android.bluetooth.BluetoothSocket.read(BluetoothSocket.java:307)
ERROR/BluetoothConnectionService(3439): at android.bluetooth.BluetoothInputStream.read(BluetoothInputStream.java:96)
ERROR/BluetoothConnectionService(3439): at java.io.InputStream.read(InputStream.java:133)**
INFO/ProtectionService(3439): Send Bluetooth message
**ERROR/BluetoothConnectionService(3439): Exception during write
ERROR/BluetoothConnectionService(3439): java.io.IOException: Transport endpoint is not connected
ERROR/BluetoothConnectionService(3439): at android.bluetooth.BluetoothSocket.writeNative(Native Method)
ERROR/BluetoothConnectionService(3439): at android.bluetooth.BluetoothSocket.write(BluetoothSocket.java:317)**
当我这样做时，错误显然出现了：
bytes = mmInStream.read(buffer);
我做错了什么？我正在处理这个错误一个星期，我无法通过......
任何帮助都会非常苛刻！
答案 0 :(得分：17)
前几天我遇到了一个非常类似的问题......
尝试将此检查添加到您的代码中：
if(mmInStream.available() > 0){
bytes = mmInStream.read(buffer);
mHandler.obtainMessage(MESSAGE_WRITE, -1, -1, buffer).sendToTarget();
}
这解决了我的问题...
祝你好运;）
答案 1 :(得分：-1)
这就是我解决问题的方法：实现某种超时。在我的情况下3秒。代码不是我的，但效果很好。 基本上发生的是有一个第二个循环等待输入到inputStream中。当inputStream中有东西时，它会继续读取它。这样你应该避免在mmInputstream.read（）方法中阻塞。
我认为这是一个很好的解决方案。它对我很好：我不是作者。
ByteArrayOutputStream baos = new ByteArrayOutputStream();
baos.reset();
while (true) {
treshHold = 0;
try {
try {
while (mmInStream.available() == 0 && treshHold < 3000) { // if there is something in the inputStream or after 3 seconds
Thread.sleep(1);
treshHold++;
}
} catch (IOException e1) {
e1.printStackTrace();
} catch (InterruptedException e1) {
e1.printStackTrace();
}
if (treshHold < 3000) { // if less than 3 seconds timeout
treshHold = 0;
b = mmInStream.read();
readBytes++;
} else {
break;
}
baos.write(b);
Thread.sleep(1);
if (b == 255) {
break; // this is how I know I have got the whole response
}
} catch (IOException e) {
e.printStackTrace();
break;
} catch (InterruptedException e) {
e.printStackTrace();
break;
}
}
while（true）可以更改，具体取决于您希望收到的内容。在我的情况下，当我收到0xFF或255时，我会离开。希望它有所帮助。
至于对outputStream的写入，我使用了以下内容：
if(mmOutStream !=null)
{
try {
mmOutStream.flush();
} catch (IOException e1) {
// log here ...
e1.printStackTrace();
}
try {
mmOutStream.write(send, 0, sendLength);
} catch (IOException e) {
// log here ...
setState(STATE_NONE);
}
}
如果有帮助，请将答案标记为正确:)