我正在尝试使用带有这些代码的Bluetooth
意向服务发送数据,但是我无法将消息发送到设备。我正在调试此代码,但DataSend类元素似乎为空。我该如何解决该问题,或者如何使用Intent服务正确编写发送消息的代码?
我这样称呼片段:
最终意图sendData = new Intent(getActivity(),DataSend.class);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String s = editText.getText().toString();
sendData.putExtra("test",s);
}
});
这是我的DataSend服务代码:
public class DataSend extends IntentService{
private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
private static final String TAG = "DataTransmissionService";
private BluetoothAdapter btAdapter = null;
private BluetoothSocket btSocket = null;
private OutputStream outStream = null;
private BluetoothDevice device = null;
private Log log;
public DataSend() {
super("DataSend");
}
@Override
protected void onHandleIntent(Intent intent) {
cleanup();
if (intent != null){
btAdapter = BluetoothAdapter.getDefaultAdapter();
String pairedDeviceAddress = "38:1B:4B:98:E7:ED";
try {
log.d(TAG, pairedDeviceAddress);
device = btAdapter.getRemoteDevice(pairedDeviceAddress);
log.d(TAG, "Device bond state : " + device.getBondState());
} catch (Exception e) {
log.e(TAG, "Invalid address: " + e.getMessage());
return;
}
try {
btSocket = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) {
log.e(TAG, "Socket creation failed: " + e.getMessage());
return;
}
try {
if (!btSocket.isConnected()) {
btSocket.connect();
log.d(TAG, "Connected");
} else {
log.d(TAG, "Already Connected"); //flow never reaches here for any use case
}
} catch (IOException e) {
log.e(TAG, "btSocket.connect() failed : " + e.getMessage());
return;
}
try {
outStream = btSocket.getOutputStream();
} catch (IOException e) {
log.e(TAG, "Failed to get output stream:" + e.getMessage());
return;
}
sendData("test");
//cleanup(); called in onDestroy()
}
}
private void cleanup(){
try {
if (outStream != null) {
outStream.close();
outStream = null;
}
} catch (Exception e) {
log.e(TAG, "Failed to close output stream : " + e.getMessage());
}
try {
if (btSocket != null) {
btSocket.close();
btSocket = null;
}
}catch (Exception e) {
log.e(TAG, "Failed to close connection : " + e.getMessage());
}
}
private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
if(Build.VERSION.SDK_INT >= 10){
try {
final Method m = device.getClass().getMethod("createInsecureRfcommSocketToServiceRecord", new Class[] { UUID.class });
return (BluetoothSocket) m.invoke(device, MY_UUID);
} catch (Exception e) {
log.e(TAG, "Could not create Insecure RFComm Connection",e);
}
}
return device.createRfcommSocketToServiceRecord(MY_UUID);
}
private void sendData(String message) {
byte[] msgBuffer = message.getBytes();
log.d(TAG, "Sending : " + message);
try {
outStream.write(msgBuffer);
} catch (IOException e) {
log.e(TAG, "failed to write " + message);
}
}
}
答案 0 :(得分:1)
我将使用您连接的设备初始化BluetoothConnection,然后以这种方式发送数据。看起来像这样:
BluetoothConnection connection = new BluetoothConnection(connectedDevice);
public void sendData(){
String s = editText.getText().toString();
byte[] b = s.getBytes();
connection.write(b);
//System.out.println("Bytes Sent");
}// end sendData
答案 1 :(得分:0)
您是否致电startService(sendData);
以启动蓝牙发送服务?看来您只是在创建意图并用数据填充它,而没有启动它。