我正试图通过安装在Nexus 5中的应用程序连接设备。我想在android中制作一个类似彩虹联系人的应用程序。在我的应用程序中，我的目标是通过蓝牙连接到另一台设备，并传输一组联系人或文件。我回答了这个问题，但上面提到的变通方法对我不起作用这是我的完整代码。这是我的应用程序中的代码片段，我在其中尝试获取套接字并建立连接。
我可以通过配对设备对话框，但当我尝试配对时，会引发错误
//to create socket
if (secure) {
bluetoothSocket = device.createRfcommSocketToServiceRecord(uuid);
} else {
bluetoothSocket = device.createInsecureRfcommSocketToServiceRecord(uuid);
}
//connection establishment
try {
bluetoothSocket.connect();
success = true;
break;
} catch (IOException e) {
//try the fallback
try {
Class<?> clazz = tmp.getRemoteDevice().getClass();
Class<?>[] paramTypes = new Class<?>[] {Integer.TYPE};
Method m = clazz.getMethod("createRfcommSocket", paramTypes);
Object[] params = new Object[] {Integer.valueOf(1)};
bluetoothSocket = (BluetoothSocket) m.invoke(tmp.getRemoteDevice(), params);
Thread.sleep(500);
bluetoothSocket.connect();
success = true;
break;
} catch (FallbackException e1) {
Log.w("BT", "Could not initialize FallbackBluetoothSocket classes.", e);
} catch (InterruptedException e1) {
Log.w("BT", e1.getMessage(), e1);
} catch (IOException e1) {
Log.w("BT", "Fallback failed. Cancelling.", e1);
}
}
错误我正在获取
09-06 13:44:57.247 27860-27860/com.example.gauravdubey.myapplication I/BT﹕ Attempting to connect to Protocol: 00001101-0000-1000-8000-00805f9b34fb
09-06 13:44:57.247 27860-27860/com.example.gauravdubey.myapplication W/BluetoothAdapter﹕ getBluetoothService() called with no BluetoothManagerCallback
09-06 13:44:57.247 27860-27860/com.example.gauravdubey.myapplication D/BluetoothSocket﹕ connect(), SocketState: INIT, mPfd: {ParcelFileDescriptor: FileDescriptor[56]}
09-06 13:44:58.667 27860-27860/com.example.gauravdubey.myapplication W/BluetoothAdapter﹕ getBluetoothService() called with no BluetoothManagerCallback
09-06 13:44:58.667 27860-27860/com.example.gauravdubey.myapplication D/BluetoothSocket﹕ connect(), SocketState: INIT, mPfd: {ParcelFileDescriptor: FileDescriptor[59]}
09-06 13:45:03.267 27860-27860/com.example.gauravdubey.myapplication W/BT﹕ Fallback failed. Cancelling.
java.io.IOException: read failed, socket might closed or timeout, read ret: -1
at android.bluetooth.BluetoothSocket.readAll(BluetoothSocket.java:505)
at android.bluetooth.BluetoothSocket.waitSocketSignal(BluetoothSocket.java:482)
at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:324)
at com.example.gauravdubey.myapplication.BluetoothConnector$FallbackBluetoothSocket.connect(BluetoothConnector.java:198)
at com.example.gauravdubey.myapplication.BluetoothConnector.connect(BluetoothConnector.java:62)
at com.example.gauravdubey.myapplication.ConnectThread.run(ConnectThread.java:101)
at com.example.gauravdubey.myapplication.MainActivity$1.onItemClick(MainActivity.java:288)
at android.widget.AdapterView.performItemClick(AdapterView.java:299)
at android.widget.AbsListView.performItemClick(AbsListView.java:1113)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:2911)
at android.widget.AbsListView$3.run(AbsListView.java:3645)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
09-06 13:45:03.267 27860-27860/com.example.gauravdubey.myapplication V/connectThread﹕ Could not connect to device: B0:D0:9C:8B:A4:47
09-06 13:45:03.267 27860-27860/com.example.gauravdubey.myapplication I/Choreographer﹕ Skipped 361 frames! The application may be doing too much work on its main thread.
那么我做错了什么？任何帮助都将不胜感激
在BluetoothConnector.java的构造函数中，传递uuidCandidates列表。
public BluetoothConnector(BluetoothDevice device, boolean secure, BluetoothAdapter adapter,
List<UUID> uuidCandidates)
{
this.device = device;
this.secure = secure;
this.adapter = adapter;
this.uuidCandidates = uuidCandidates;
if (this.uuidCandidates == null || this.uuidCandidates.isEmpty()) {
this.uuidCandidates = new ArrayList<UUID>();
this.uuidCandidates.add(UUID.fromString("fa87c0d0-afac-11de-8a39-0800200c9a66"));
}
}
你把它传为null了吗
如果是，请尝试为要连接的蓝牙设备调用device.fetchUuidsWithSdp()，并在接收器中接收BluetoothDevice.ACTION_UUID意向。因为这将获取设备支持的uuid列表。
在try（"//尝试回退"）中使用此：
socket =(BluetoothSocket) device.getClass().getMethod("createRfcommSocket", new Class[] {int.class}).invoke(device,1);
socket.connect();
另一个技巧可能是使用不同的UUID，这可能会解决问题。
我不知道你是否尝试过，但与蓝牙聊天示例中所做的类似，在创建ConnectThread之前，调用以下函数：
public synchronized void connect(BluetoothDevice 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);
}
脏缓存。在设备上找到清除应用程序缓存的位置，然后重新启动。你可能有一个设备流量控制中断器（防火墙、应用墙、安全软件），它会拦截端口并重新发布它——这就是问题所在。根据它在启动时的实例化位置，它现在与你的应用程序想要的不同。因此，通过抓取缓存并重新启动以重新构建缓存/重定向表来重建表。我知道这听起来很短暂，但它对我有效。
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
device = BluetoothAdapter.getDefaultAdapter().getRemoteDevice(Device);
device.createBond();
}
});