Android的蓝牙连接问题 [英] Android Bluetooth connection issue
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问题描述
我尝试建立如下蓝牙连接：
I try to set up a Bluetooth connection as follow :
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);
}
}
连接似乎是好了，我得到这个日志：
The connection seems to be OK, I get this log :
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**
在 BluetoothSocket.connect（）返回没有错误。
然后我管理这个连接：
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);
}
}
和我收到此错误：
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)**
这个错误清楚地到来，当我这样做：
The error clearly come when I am doing this :
bytes = mmInStream.read(buffer);
我是什么做错了吗？我工作的这个错误了一个星期，我无法通过......
What am I doing wrong ? I'm working on this error for a week and I can't go through...
任何帮助将是非常一个preciated！
Any help would be very apreciated !
推荐答案
我前几天有一个非常类似的问题...
I had a very similar problem some days ago...
尝试增加这个检查你的code：
Try adding this check to your code:
if(mmInStream.available() > 0){
bytes = mmInStream.read(buffer);
mHandler.obtainMessage(MESSAGE_WRITE, -1, -1, buffer).sendToTarget();
}
这固定我的问题...
This fixed my problem...
好运;）
这篇关于Android的蓝牙连接问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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