我的目标是连接已经配对的蓝牙设备。我有所有配对的设备名称，我在列表视图中显示它们。当我点击列表视图中的任何设备名称时，它应该连接到该设备，如果它在范围内。
每当我尝试通过调用mmSocket.connect()连接到设备时，我在下面显示的日志中遇到此系统错误，然后调用mmSocket.close()：
06-22 17:40:50.617: W/System.err(25986): java.io.IOException: read failed, socket might closed or timeout, read ret: -1
06-22 17:40:50.618: W/System.err(25986): at android.bluetooth.BluetoothSocket.readAll(BluetoothSocket.java:510)
06-22 17:40:50.619: W/System.err(25986): at android.bluetooth.BluetoothSocket.readInt(BluetoothSocket.java:521)
06-22 17:40:50.619: W/System.err(25986): at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:320)
06-22 17:40:50.619: W/System.err(25986): at ik.learning.bluetooth.MainActivity$ConnectThread.run(MainActivity.java:233)
我不确定为什么会发生这种情况可以帮助我。以下是我的代码：
public class MainActivity extends Activity implements OnItemClickListener{
ArrayAdapter<String> listAdapter;
Button connectNew;
ListView listView;
BluetoothAdapter btAdapter;
Set<BluetoothDevice> devicesArray;
IntentFilter filter;
BroadcastReceiver receiver;
ArrayList<String> pairedDevices;
ArrayList<BluetoothDevice> devices;
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;
Handler mHandler;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
if(btAdapter == null){
Toast.makeText(this, "No bluetooth detected", Toast.LENGTH_LONG).show();
finish();
} else {
if(!btAdapter.isEnabled()){
turnOnBluetooth();
}
getPairedDevices();
startDiscovery();
}
mHandler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch(msg.what){
case SUCCESS_CONNECT:
ConnectedThread connectedThread = new ConnectedThread((BluetoothSocket) msg.obj);
Toast.makeText(getApplicationContext(), "Connected", Toast.LENGTH_SHORT).show();
String s = "Successfully connected";
connectedThread.write(s.getBytes());
break;
case MESSAGE_READ:
byte[] readBuff = (byte[]) msg.obj;
String string = new String(readBuff);
Toast.makeText(getApplicationContext(), string, Toast.LENGTH_SHORT).show();
break;
}
}
};
}
private void startDiscovery() {
// TODO Auto-generated method stub
btAdapter.cancelDiscovery();
btAdapter.startDiscovery();
}
private void turnOnBluetooth() {
// TODO Auto-generated method stub
Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(intent, 1);
}
private void getPairedDevices() {
// TODO Auto-generated method stub
devicesArray = btAdapter.getBondedDevices();
if(devicesArray.size() > 0){
for(BluetoothDevice device : devicesArray){
//listAdapter.add(device.getName()+"\n"+device.getAddress());
pairedDevices.add(device.getName());//+"\n"+device.getAddress());
}
}
}
private void init() {
connectNew = (Button) findViewById(R.id.btnConnectNew);
listView = (ListView) findViewById(R.id.bluetoothlistView);
listView.setOnItemClickListener(this);
listAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_expandable_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) {
// TODO Auto-generated method stub
String action = intent.getAction();
if(BluetoothDevice.ACTION_FOUND.equals(action)){
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
devices.add(device);
String s = "";
for(int i = 0; i< pairedDevices.size(); i++){
if(device.getName().equals(pairedDevices.get(i))){
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){
turnOnBluetooth();
}
}
}
};
registerReceiver(receiver, filter);
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);
registerReceiver(receiver, filter);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
if(resultCode == RESULT_CANCELED){
Toast.makeText(getApplicationContext(), "Bluetooth must be enabled to continue", Toast.LENGTH_SHORT).show();
}
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
unregisterReceiver(receiver);
}
@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")){
//Object[] o = devicesArray.toArray();
BluetoothDevice selectedDevice = devices.get(arg2);
ConnectThread connect = new ConnectThread(selectedDevice);
connect.start();
Toast.makeText(getApplicationContext(), "Devices Paired", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getApplicationContext(), "Devices Not Paired", Toast.LENGTH_SHORT).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
Log.d("ConnectThread","try connect");
//mHandler.obtainMessage(SUCCESS_CONNECT, mmSocket).sendToTarget();
mmSocket.connect();
} catch (IOException connectException) {
// Unable to connect; close the socket and get out
connectException.printStackTrace();
Log.d("ConnectThread","catch connect: "+connectException);
try {
Log.d("ConnectThread","try soccet close");
mmSocket.close();
} catch (IOException closeException) {
Log.d("ConnectThread","catch close: "+connectException);
}
return;
}
// Do work to manage the connection (in a separate thread)
Log.d("ConnectThread","before manage connected socket");
//manageConnectedSocket(mmSocket);
mHandler.obtainMessage(SUCCESS_CONNECT, mmSocket).sendToTarget();
}
/*private void manageConnectedSocket(BluetoothSocket mmSocket2) {
// TODO Auto-generated method stub
}*/
/** Will cancel an in-progress connection, and close the socket */
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) { }
}
}
private 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;
}
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 {
buffer = new byte[1024]; // buffer store for the stream
// 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(byte[] bytes) {
try {
mmOutStream.write(bytes);
} catch (IOException e) { }
}
/* Call this from the main activity to shutdown the connection */
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) { }
}
}
}
答案 0 :(得分：0)
在点击列表项后，您将获得蓝牙名称，使用该名称，您可以通过调用BluetoothAdapter.getDefaultAdapter（）获取蓝牙设备对象.getRemoteDevice（bluetoothDevice.getAddress（））;
以下是连接蓝牙设备的示例代码..
//global variable
BluetoothSocket mBSocket;
// inside run() function
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if(mBluetoothAdapter.isEnabled()) {
try {
for(BluetoothDevice bt: mBluetoothAdapter.getBondedDevices()) {
if(bt.getName().equalsIgnoreCase(selectedDevice.getName())) {
BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(bt.getAddress());
mBluetoothAdapter.cancelDiscovery();
mBSocket = device.createRfcommSocketToServiceRecord(SPP_UUID);
mBSocket.connect();
return mBSocket;
}
}
} catch(IOException e) {
if(mBSocket != null) {
try {
mBSocket.close();
} catch (IOException e1) {
e1.printStackTrace();
}
mBSocket = null;
}
e.printStackTrace();
return null;
}
}
return null;
希望它有所帮助。