问题
I seem to be facing this weird error on a socket.connect():
09-18 14:41:22.968: W/System.err(2593): java.lang.NullPointerException
09-18 14:41:22.968: W/System.err(2593): at android.sec.enterprise.BluetoothUtils.**isSocketAllowedBySecurityPolicy**(BluetoothUtils.java:106)
09-18 14:41:22.968: W/System.err(2593): at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:220)
09-18 14:41:22.968: W/System.err(2593): at com._._.android._._.bluetoothmodule.BluetoothController.connectToDevice(BluetoothController.java:136)
09-18 14:41:22.976: W/System.err(2593): at com._._.android._._.controllermodule.ControllerModule.connectToDevice(ControllerModule.java:235)
09-18 14:41:22.976: W/System.err(2593): at com._._.android._._.controllermodule.ControllerModule.connectToDevice(ControllerModule.java:263)
09-18 14:41:22.976: W/System.err(2593): at com._._.android._._.service.ConnectionService.onHandleIntent(ConnectionService.java:70)
09-18 14:41:22.976: W/System.err(2593): at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:65)
09-18 14:41:22.976: W/System.err(2593): at android.os.Handler.dispatchMessage(Handler.java:99)
09-18 14:41:22.976: W/System.err(2593): at android.os.Looper.loop(Looper.java:137)
09-18 14:41:22.976: W/System.err(2593): at android.os.HandlerThread.run(HandlerThread.java:60)
Yes, I am checking if the socket is null before connecting to it. I seem to be only facing this issue on the Galaxy Tab 2 running 4.0.4. My code works fine on other devices/android versions [including JB]. Not sure what might be going on here. Listed below is a small chunk demonstrating how i initialize my socket:
Method m = bluetoothDevice.getClass().getMethod(
"createInsecureRfcommSocket", new Class[] { int.class });
Logging.getInstance().logMessage(this.getClass().getSimpleName(), "Returned the Reflection method successfully..",Logging.LOG_ERROR);
// get readSocket
mreadSocket = (BluetoothSocket) m.invoke(bluetoothDevice, 1);
assert (mreadSocket != null) : "readSocket is Null";
if (mreadSocket != null) {
mreadSocket.connect();
}
Any help would be greatly appreciated!
回答1:
Warning: the code below may be insecure, use at your own risk
In my case I was able to connect using createInsecureRfcommSocketToServiceRecord
rather than createRfcommSocketToServiceRecord
but I see you were already doing that. My code looks more like this (error/exception checking removed):
BluetoothDevice device;
String deviceName = ... selected or hardcoded device name. See Android HDR sample code
BluetoothDevice[] mAllBondedDevices = (BluetoothDevice[]) mBluetoothAdapter.getBondedDevices().toArray(new BluetoothDevice[0]);
for (BluetoothDevice d : mAllBondedDevices) {
if (deviceName.equals(d.getName())) {
device = d;
break;
}
}
UUID uuid = device.getUuids()[0].getUuid();
//FAILED: socket = device.createRfcommSocketToServiceRecord(uuid);
// Succeeds: Warning, INSECURE!
socket = device.createInsecureRfcommSocketToServiceRecord(uuid);
socket.connect();
this.dos = new DataOutputStream(new BufferedOutputStream(socket.getOutputStream()));
this.dis = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
//etc
Note that while an insecure connection is not perfect, in our case an insecure connection is preferable to no connection. I posted this an an answer so that you could try the alternate code.
回答2:
I had the same problem with the Galaxy tab 2 and I solved with:
BluetoothSocket tmp = null;
try {
tmp = device.createRfcommSocketToServiceRecord(SPP_UUID);
// for others devices its works with:
// Method m = device.getClass().getMethod("createRfcommSocket", new Class[] {int.class});
// for galaxy tab 2 with:
Method m = device.getClass().getMethod("createInsecureRfcommSocket", new Class[] {int.class});
tmp = (BluetoothSocket) m.invoke(device, 1);
} catch (IOException e) {
Log.e(TAG, "failed! error: " + e.getMessage());
}
socket = tmp;
socket.connect();
Log.i(TAG, "Client Connected!");
Hope this helps =D
来源:https://stackoverflow.com/questions/12485785/nullpointer-exception-on-socket-connect-galaxy-tab-2-running-android-4-04