蓝牙错误(Error with bluetooth)

 我的应用程序使用蓝牙有问题。 该应用程序工作正常，除了几次，但我无法确定问题。 这是蓝牙的活动： 
 
public class Bluetooth extends Activity implements OnItemClickListener{

public static void disconnect(){
    if (connectedThread != null) {
        connectedThread.cancel(); 
        connectedThread = null;
    }
}

public static void gethandler(Handler handler){//Bluetooth handler
    mHandler = handler;
}
static Handler mHandler = new Handler();

static ConnectedThread connectedThread;
public static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
protected static final int SUCCESS_CONNECT = 0;
protected static final int MESSAGE_READ = 1;
ArrayAdapter<String> listAdapter;
ListView listView;
static BluetoothAdapter btAdapter;
Set<BluetoothDevice> devicesArray;
ArrayList<String> pairedDevices;
ArrayList<BluetoothDevice> devices;
IntentFilter filter;
BroadcastReceiver receiver;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_bluetooth);
    init();
    if (btAdapter==null){
        Toast.makeText(getApplicationContext(), "No bluetooth detected", 0).show();
        finish();
    }else{
        if (!btAdapter.isEnabled()){
            turnOnBT();
        }
        getPairedDevices();
        startDiscovery();
    }

}


private void startDiscovery() {
    // TODO Auto-generated method stub
    btAdapter.cancelDiscovery();
    btAdapter.startDiscovery();
}

private void turnOnBT() {
    Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
    startActivityForResult(intent, 1);
}

private void getPairedDevices() {
    devicesArray = btAdapter.getBondedDevices();
    if (devicesArray.size()>0){
        for(BluetoothDevice device:devicesArray){
            pairedDevices.add(device.getName());
        }
    }
}

private void init(){
    listView = (ListView)findViewById(R.id.listView);
    listView.setOnItemClickListener(this);
    listAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,0);
    listView.setAdapter(listAdapter);
    btAdapter = BluetoothAdapter.getDefaultAdapter();
    pairedDevices = new ArrayList<String>();
    filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
    devices = new ArrayList<BluetoothDevice>(); 
    receiver = new BroadcastReceiver(){
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (BluetoothDevice.ACTION_FOUND.equals(action)){
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                devices.add(device);
                String s = "";
                for(int a=0;a<pairedDevices.size();a++){
                    if (device.getName().equals(pairedDevices.get(a))){
                        //append
                        s = "(Paired)";
                        break;
                    }
                }
                listAdapter.add(device.getName()+" "+s+" "+"\n"+device.getAddress());

            }else if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)){

            }else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)){

            }else if (BluetoothAdapter.ACTION_STATE_CHANGED.equals(action)){
                if (btAdapter.getState() == btAdapter.STATE_OFF){
                    turnOnBT();
                }
            }  
        }

    };

    registerReceiver(receiver, filter);
    IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
    registerReceiver(receiver, filter);
    filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
    registerReceiver(receiver, filter);
    filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
}

@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    unregisterReceiver(receiver);
}

protected void onActivityResult(int requestCode, int resultCode, Intent data){
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == RESULT_CANCELED){
        Toast.makeText(getApplicationContext(), "Bluetooth must be enabled to continue", Toast.LENGTH_SHORT).show();
        finish();
    }
}

@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
    // TODO Auto-generated method stub
    if (btAdapter.isDiscovering()){
        btAdapter.cancelDiscovery();
    }
    if (listAdapter.getItem(arg2).contains("(Paired)")){

        BluetoothDevice selectedDevice = devices.get(arg2);
        ConnectThread connect = new ConnectThread(selectedDevice);
        connect.start();
    }else {
        Toast.makeText(getApplicationContext(), "device is not paired", 0).show();
    }
}

private 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() {
        // Cancel discovery because it will slow down the connection
        btAdapter.cancelDiscovery();

        try {
            // Connect the device through the socket. This will block
            // until it succeeds or throws an exception
            mmSocket.connect();
            //connectedThread = new ConnectedThread(mmSocket);
        } catch (IOException connectException) {
            // Unable to connect; close the socket and get out
            try {
                mmSocket.close();
            } catch (IOException closeException) { }
            return;
        }

        // Do work to manage the connection (in a separate thread)
        mHandler.obtainMessage(SUCCESS_CONNECT, mmSocket).sendToTarget();
    }

    /** Will cancel an in-progress connection, and close the socket */
    public void cancel() {
        try {
            mmSocket.close();
        } catch (IOException e) { }
    }
}

static class ConnectedThread extends Thread {
    private final BluetoothSocket mmSocket;
    private final InputStream mmInStream;
    private final OutputStream mmOutStream;

    public ConnectedThread(BluetoothSocket socket) {
        mmSocket = socket;
        InputStream tmpIn = null;
        OutputStream tmpOut = null;

        // Get the input and output streams, using temp objects because
        // member streams are final
        try {
            tmpIn = socket.getInputStream();
            tmpOut = socket.getOutputStream();
        } catch (IOException e) { }

        mmInStream = tmpIn;
        mmOutStream = tmpOut;
    }
    StringBuffer sbb = new StringBuffer();
    public void run() {

        byte[] buffer;  // buffer store for the stream
        int bytes; // bytes returned from read()

        // Keep listening to the InputStream until an exception occurs
        while (true) {
            try {
                try {
                    sleep(30);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

                buffer = new byte[1024];
                // Read from the InputStream
                bytes = mmInStream.read(buffer);
                // Send the obtained bytes to the UI activity
                mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer).sendToTarget();
            } catch (IOException e) {
                break;
            }
        }
    }

    /* Call this from the main activity to send data to the remote device */
    public void write(String income) {

        try {
            mmOutStream.write(income.getBytes());
            for(int i=0;i<income.getBytes().length;i++)
            Log.v("outStream"+Integer.toString(i),Character.toString((char)(Integer.parseInt(Byte.toString(income.getBytes()[i])))));
            try {
                Thread.sleep(20);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        } catch (IOException e) { }
    }

    /* Call this from the main activity to shutdown the connection */
    public void cancel() {
        try {
            mmSocket.close();
        } catch (IOException e) { }
    }
}

}
 
 这是logcat： 
 
08-04 17:54:52.859: D/AndroidRuntime(12302): Shutting down VM
08-04 17:54:52.859: W/dalvikvm(12302): threadid=1: thread exiting with uncaught exception (group=0x4161ace0)
08-04 17:54:52.869: E/AndroidRuntime(12302): FATAL EXCEPTION: main
08-04 17:54:52.869: E/AndroidRuntime(12302): Process: com.example.tut1, PID: 12302
08-04 17:54:52.869: E/AndroidRuntime(12302): java.lang.RuntimeException: Unable to pause activity {com.example.tut1/com.example.tut1.Bluetooth}: java.lang.IllegalArgumentException: Receiver not registered: com.example.tut1.Bluetooth$1@41e4a9e0
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3079)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3034)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:3012)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.ActivityThread.access$1000(ActivityThread.java:144)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1222)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.os.Handler.dispatchMessage(Handler.java:102)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.os.Looper.loop(Looper.java:136)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.ActivityThread.main(ActivityThread.java:5139)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at java.lang.reflect.Method.invokeNative(Native Method)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at java.lang.reflect.Method.invoke(Method.java:515)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:796)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:612)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:132)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at dalvik.system.NativeStart.main(Native Method)
08-04 17:54:52.869: E/AndroidRuntime(12302): Caused by: java.lang.IllegalArgumentException: Receiver not registered: com.example.tut1.Bluetooth$1@41e4a9e0
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.LoadedApk.forgetReceiverDispatcher(LoadedApk.java:665)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.ContextImpl.unregisterReceiver(ContextImpl.java:1517)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.content.ContextWrapper.unregisterReceiver(ContextWrapper.java:489)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at com.example.tut1.Bluetooth.onPause(Bluetooth.java:145)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.Activity.performPause(Activity.java:5335)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.Instrumentation.callActivityOnPause(Instrumentation.java:1233)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3065)
-04 17:54:52.869: E/AndroidRuntime(12302):  ... 13 more
 
 编辑。 
 
 我注意到当Activity为“Bluetooth”时我崩溃，然后我按下后退按钮。 即使它并非总是如此。 有人能帮我吗？ 谢谢。 

I have a problem with an app that uses bluetooth. The app works fine except on a few occasions but I can not identify the problem. This is the activity of bluetooth:
 
public class Bluetooth extends Activity implements OnItemClickListener{

public static void disconnect(){
    if (connectedThread != null) {
        connectedThread.cancel(); 
        connectedThread = null;
    }
}

public static void gethandler(Handler handler){//Bluetooth handler
    mHandler = handler;
}
static Handler mHandler = new Handler();

static ConnectedThread connectedThread;
public static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
protected static final int SUCCESS_CONNECT = 0;
protected static final int MESSAGE_READ = 1;
ArrayAdapter<String> listAdapter;
ListView listView;
static BluetoothAdapter btAdapter;
Set<BluetoothDevice> devicesArray;
ArrayList<String> pairedDevices;
ArrayList<BluetoothDevice> devices;
IntentFilter filter;
BroadcastReceiver receiver;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_bluetooth);
    init();
    if (btAdapter==null){
        Toast.makeText(getApplicationContext(), "No bluetooth detected", 0).show();
        finish();
    }else{
        if (!btAdapter.isEnabled()){
            turnOnBT();
        }
        getPairedDevices();
        startDiscovery();
    }

}


private void startDiscovery() {
    // TODO Auto-generated method stub
    btAdapter.cancelDiscovery();
    btAdapter.startDiscovery();
}

private void turnOnBT() {
    Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
    startActivityForResult(intent, 1);
}

private void getPairedDevices() {
    devicesArray = btAdapter.getBondedDevices();
    if (devicesArray.size()>0){
        for(BluetoothDevice device:devicesArray){
            pairedDevices.add(device.getName());
        }
    }
}

private void init(){
    listView = (ListView)findViewById(R.id.listView);
    listView.setOnItemClickListener(this);
    listAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,0);
    listView.setAdapter(listAdapter);
    btAdapter = BluetoothAdapter.getDefaultAdapter();
    pairedDevices = new ArrayList<String>();
    filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
    devices = new ArrayList<BluetoothDevice>(); 
    receiver = new BroadcastReceiver(){
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (BluetoothDevice.ACTION_FOUND.equals(action)){
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                devices.add(device);
                String s = "";
                for(int a=0;a<pairedDevices.size();a++){
                    if (device.getName().equals(pairedDevices.get(a))){
                        //append
                        s = "(Paired)";
                        break;
                    }
                }
                listAdapter.add(device.getName()+" "+s+" "+"\n"+device.getAddress());

            }else if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)){

            }else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)){

            }else if (BluetoothAdapter.ACTION_STATE_CHANGED.equals(action)){
                if (btAdapter.getState() == btAdapter.STATE_OFF){
                    turnOnBT();
                }
            }  
        }

    };

    registerReceiver(receiver, filter);
    IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
    registerReceiver(receiver, filter);
    filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
    registerReceiver(receiver, filter);
    filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
}

@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    unregisterReceiver(receiver);
}

protected void onActivityResult(int requestCode, int resultCode, Intent data){
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == RESULT_CANCELED){
        Toast.makeText(getApplicationContext(), "Bluetooth must be enabled to continue", Toast.LENGTH_SHORT).show();
        finish();
    }
}

@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
    // TODO Auto-generated method stub
    if (btAdapter.isDiscovering()){
        btAdapter.cancelDiscovery();
    }
    if (listAdapter.getItem(arg2).contains("(Paired)")){

        BluetoothDevice selectedDevice = devices.get(arg2);
        ConnectThread connect = new ConnectThread(selectedDevice);
        connect.start();
    }else {
        Toast.makeText(getApplicationContext(), "device is not paired", 0).show();
    }
}

private 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() {
        // Cancel discovery because it will slow down the connection
        btAdapter.cancelDiscovery();

        try {
            // Connect the device through the socket. This will block
            // until it succeeds or throws an exception
            mmSocket.connect();
            //connectedThread = new ConnectedThread(mmSocket);
        } catch (IOException connectException) {
            // Unable to connect; close the socket and get out
            try {
                mmSocket.close();
            } catch (IOException closeException) { }
            return;
        }

        // Do work to manage the connection (in a separate thread)
        mHandler.obtainMessage(SUCCESS_CONNECT, mmSocket).sendToTarget();
    }

    /** Will cancel an in-progress connection, and close the socket */
    public void cancel() {
        try {
            mmSocket.close();
        } catch (IOException e) { }
    }
}

static class ConnectedThread extends Thread {
    private final BluetoothSocket mmSocket;
    private final InputStream mmInStream;
    private final OutputStream mmOutStream;

    public ConnectedThread(BluetoothSocket socket) {
        mmSocket = socket;
        InputStream tmpIn = null;
        OutputStream tmpOut = null;

        // Get the input and output streams, using temp objects because
        // member streams are final
        try {
            tmpIn = socket.getInputStream();
            tmpOut = socket.getOutputStream();
        } catch (IOException e) { }

        mmInStream = tmpIn;
        mmOutStream = tmpOut;
    }
    StringBuffer sbb = new StringBuffer();
    public void run() {

        byte[] buffer;  // buffer store for the stream
        int bytes; // bytes returned from read()

        // Keep listening to the InputStream until an exception occurs
        while (true) {
            try {
                try {
                    sleep(30);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

                buffer = new byte[1024];
                // Read from the InputStream
                bytes = mmInStream.read(buffer);
                // Send the obtained bytes to the UI activity
                mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer).sendToTarget();
            } catch (IOException e) {
                break;
            }
        }
    }

    /* Call this from the main activity to send data to the remote device */
    public void write(String income) {

        try {
            mmOutStream.write(income.getBytes());
            for(int i=0;i<income.getBytes().length;i++)
            Log.v("outStream"+Integer.toString(i),Character.toString((char)(Integer.parseInt(Byte.toString(income.getBytes()[i])))));
            try {
                Thread.sleep(20);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        } catch (IOException e) { }
    }

    /* Call this from the main activity to shutdown the connection */
    public void cancel() {
        try {
            mmSocket.close();
        } catch (IOException e) { }
    }
}

}
 
and this is the logcat:
 
08-04 17:54:52.859: D/AndroidRuntime(12302): Shutting down VM
08-04 17:54:52.859: W/dalvikvm(12302): threadid=1: thread exiting with uncaught exception (group=0x4161ace0)
08-04 17:54:52.869: E/AndroidRuntime(12302): FATAL EXCEPTION: main
08-04 17:54:52.869: E/AndroidRuntime(12302): Process: com.example.tut1, PID: 12302
08-04 17:54:52.869: E/AndroidRuntime(12302): java.lang.RuntimeException: Unable to pause activity {com.example.tut1/com.example.tut1.Bluetooth}: java.lang.IllegalArgumentException: Receiver not registered: com.example.tut1.Bluetooth$1@41e4a9e0
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3079)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3034)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:3012)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.ActivityThread.access$1000(ActivityThread.java:144)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1222)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.os.Handler.dispatchMessage(Handler.java:102)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.os.Looper.loop(Looper.java:136)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.ActivityThread.main(ActivityThread.java:5139)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at java.lang.reflect.Method.invokeNative(Native Method)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at java.lang.reflect.Method.invoke(Method.java:515)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:796)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:612)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:132)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at dalvik.system.NativeStart.main(Native Method)
08-04 17:54:52.869: E/AndroidRuntime(12302): Caused by: java.lang.IllegalArgumentException: Receiver not registered: com.example.tut1.Bluetooth$1@41e4a9e0
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.LoadedApk.forgetReceiverDispatcher(LoadedApk.java:665)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.ContextImpl.unregisterReceiver(ContextImpl.java:1517)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.content.ContextWrapper.unregisterReceiver(ContextWrapper.java:489)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at com.example.tut1.Bluetooth.onPause(Bluetooth.java:145)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.Activity.performPause(Activity.java:5335)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.Instrumentation.callActivityOnPause(Instrumentation.java:1233)
08-04 17:54:52.869: E/AndroidRuntime(12302):    at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3065)
-04 17:54:52.869: E/AndroidRuntime(12302):  ... 13 more
 
EDIT.
 
I have noticed that crashes when the Activity is "Bluetooth" and I press the back button. Even if it does not always. can someone help me? Thank you.

原文：https://stackoverflow.com/questions/25122905