Android的蓝牙无法连接 [英] android bluetooth can't connect
问题描述
我一直有这个问题了一会儿，一直没能找到答案。
I've been having this problem for a while and haven't been able to figure it out.
我有一个Android的应用程序，使在ListView所有配对设备。当您单击列表中的项目之一，它会发起一个请求连接到蓝牙设备。
I have a android application that puts all paired devices in a listview. When you click one of the list items, it will initiate a request to connect to that bluetooth device.
我可以与他们的地址没有问题的设备列表。 现在的问题是，一旦我尝试连接，我得到一个IOException对Socket.connect（）的;
I can get the list of devices with their addresses no problem. The problem is that once I try to connect I get an IOException on socket.connect();
错误信息如下： 连接读取失败，插座可能会关闭或超时，读RET：-1
下面是我的code。 任何建议将是AP preciated。我是pretty的停留在此。
Here is my code. ANY suggestions would be appreciated. I'm pretty stuck on this.
供参考：在的onEvent的方法是简化回调...这部分作品库。 当用户点击列表中的项目该方法被称为公共无效的onEvent（EventMessage.DeviceSelected事件）
fyi: the "onEvent" methods is a library that simplifies callbacks...that part works. When the user clicks on a list items this method is called "public void onEvent(EventMessage.DeviceSelected event)"
public class EcoDashActivity extends BaseActivity {
public static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
private BluetoothAdapter mBluetoothAdapter;
private int REQUEST_ENABLE_BT = 100;
private ArrayList<BluetoothDevice> mDevicesList;
private BluetoothDeviceDialog mDialog;
private ProgressDialog progressBar;
private int progressBarStatus = 0;
private Handler progressBarHandler = new Handler();
@Override
public void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
mDevicesList = new ArrayList<BluetoothDevice>();
// Register the BroadcastReceiver
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mReceiver, filter);
setupBluetooth();
}
private void setupBluetooth() {
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) {
// Device does not support Bluetooth
Toast.makeText(this, "Device does not support Bluetooth", Toast.LENGTH_SHORT).show();
}
if (!mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
} else {
searchForPairedDevices();
mDialog = new BluetoothDeviceDialog(this, mDevicesList);
mDialog.show(getFragmentManager(), "");
}
}
private void searchForPairedDevices() {
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
// If there are paired devices
if (pairedDevices.size() > 0) {
// Loop through paired devices
for (BluetoothDevice device : pairedDevices) {
// Add the name and address to an array adapter to show in a ListView
mDevices.add(device.getName() + "\n" + device.getAddress());
mDevicesList.add(device);
}
}
}
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// When discovery finds a device
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object from the Intent
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// Add the name and address to an array adapter to show in a ListView
mDevicesList.add(device);
}
}
};
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(mReceiver);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_ENABLE_BT) {
if (resultCode == RESULT_OK) {
Toast.makeText(this, "BT turned on!", Toast.LENGTH_SHORT).show();
searchForPairedDevices();
mDialog = new BluetoothDeviceDialog(this, mDevicesList);
mDialog.show(getFragmentManager(), "");
}
}
super.onActivityResult(requestCode, resultCode, data);
}
public void onEvent(EventMessage.DeviceSelected event) {
mDialog.dismiss();
BluetoothDevice device = event.getDevice();
ConnectThread connectThread = new ConnectThread(device);
connectThread.start();
}
public class ConnectThread extends Thread {
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;
public ConnectThread(BluetoothDevice device) {
// Use a temporary object that is later assigned to mmSocket,
// because mmSocket is final
BluetoothSocket tmp = null;
mmDevice = device;
// Get a BluetoothSocket to connect with the given BluetoothDevice
try {
// MY_UUID is the app's UUID string, also used by the server code
tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) { }
mmSocket = tmp;
}
public void run() {
setName("ConnectThread");
// Cancel discovery because it will slow down the connection
mBluetoothAdapter.cancelDiscovery();
try {
// Connect the device through the socket. This will block
// until it succeeds or throws an exception
Log.d("kent", "trying to connect to device");
mmSocket.connect();
Log.d("kent", "Connected!");
} catch (IOException connectException) {
// Unable to connect; close the socket and get out
try {
Log.d("kent", "failed to connect");
mmSocket.close();
} catch (IOException closeException) { }
return;
}
Log.d("kent", "Connected!");
}
/** Will cancel an in-progress connection, and close the socket */
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) { }
}
}
下面是我的logcat的。 pretty的短。
Here is my logcat. Pretty short.
07-22 10:37:05.129: DEBUG/kent(17512): trying to connect to device
07-22 10:37:05.129: WARN/BluetoothAdapter(17512): getBluetoothService() called with no BluetoothManagerCallback
07-22 10:37:05.129: DEBUG/BluetoothSocket(17512): connect(), SocketState: INIT, mPfd: {ParcelFileDescriptor: FileDescriptor[98]}
07-22 10:37:40.757: DEBUG/dalvikvm(17512): GC_CONCURRENT freed 6157K, 9% free 62793K/68972K, paused 7ms+7ms, total 72ms
07-22 10:38:06.975: DEBUG/kent(17512): failed to connect
07-22 10:38:06.975: DEBUG/kent(17512): read failed, socket might closed or timeout, read ret: -1
这是最后一行是在try / catch的捕获一节中......我只是记录错误消息。
That last line is in the "Catch" section of a try/catch...I'm just logging the error message.
请注意，有试图连接到装置和无法连接
Please note, there is about a 20 second gap between "trying to connect to device" and "failed to connect"
推荐答案
果冻豆蓝牙堆栈是从其他版本的明显不同。
The jelly bean bluetooth stack is markedly different from the other versions.
这可能会帮助：<一href="http://wiresareobsolete.com/word$p$pss/2010/11/android-bluetooth-rfcomm/">http://wiresareobsolete.com/word$p$pss/2010/11/android-bluetooth-rfcomm/
在要点： 的UUID是必须指向发布的服务的嵌入式设备上的一个值，它不只是随机生成的。您要访问的RFCOMM SPP连接有它发布到确定服务特定的UUID，当你创建一个套接字必须相同的UUID匹配。
In gist: The UUID is a value that must point to a published service on your embedded device, it is not just randomly generated. The RFCOMM SPP connection you want to access has a specific UUID that it publishes to identify that service, and when you create a socket it must match the same UUID.
如果您的目标4.0.3设备及以上，使用 fetchUuidsWithSdp（）和 getUuids（）找所有已发布的服务和其相关的UUID值。为了向后兼容阅读文章
If you are targeting 4.0.3 device and above , use fetchUuidsWithSdp() and getUuids() to find all the published services and their associated UUID values. For backward compatibility read the article
这篇关于Android的蓝牙无法连接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！
