我正在从事您必须通过蓝牙RFCOMM与其他设备连接的项目。我写了一些代码(主要基于YouTube上的Mitch Tabian教程(，但我被困住了。
我可以连接到笔记本电脑，但我无法发送和接收任何数据。我要求你们看看我的代码，告诉我哪一部分是不正确的
第二项活动
package com.example.mgr;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.content.LocalBroadcastManager;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.UUID;
public class pulpit2kod extends AppCompatActivity {
private static final String TAG = "pulpit2kod";
BluetoothAdapter mBluetoothAdapter;
private Spinner spinnerlist;
private ArrayList<String> mDeviceList = new ArrayList<>();
private ArrayList<BluetoothDevice> bttDeviceList = new ArrayList<>();
private ImageView btton;
private ImageView bttoff;
BluetoothDevice mBTDevice;
Button btconnect;
Button btsearch;
Button btgoto1screen;
Button btONOFF;
Button btvisibility;
Button btsend;
Button btpair;
EditText etsend;
BluetoothConnectionService mBluetoothConnection;
private static final UUID MY_UUID_INSECURE = UUID.fromString("8ce255c0-200a-11e0-ac64-0800200c9a66");//{0000110e-0000-1000-8000-00805f9b34fb}
StringBuilder messages;
TextView etreceive;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.pulpit2);
spinnerlist = (Spinner) findViewById(R.id.spinner);
Log.d(TAG, "onCreate: Starting");
btconnect = (Button) findViewById(R.id.polacz);
btsearch = (Button) findViewById(R.id.search) ;
btgoto1screen = (Button) findViewById(R.id.goto1screen);
btONOFF = (Button) findViewById(R.id.ONOFF);
btvisibility = (Button) findViewById(R.id.widocznosc);
btsend = (Button) findViewById(R.id.btsend);
btpair = (Button) findViewById(R.id.pair);
btton = (ImageView) findViewById(R.id.btton);
bttoff = (ImageView) findViewById(R.id.bttoff);
etsend = (EditText) findViewById(R.id.etsend);
etreceive = (TextView) findViewById(R.id.etreceive);
messages = new StringBuilder();
LocalBroadcastManager.getInstance(this).registerReceiver(mBroadcastReceiver4, new IntentFilter("incomingMessage"));
//-------------------BT ON logo ---------------------------------------------------------------
int logobtton = getResources().getIdentifier("@drawable/btton", null, this.getPackageName());
btton.setImageResource(logobtton);
//-------------------BT OFF logo --------------------------------------------------------------
int logobttoff = getResources().getIdentifier("@drawable/bttoff", null, this.getPackageName());
bttoff.setImageResource(logobttoff);
//---------------------lista position click--------------------------------
spinnerlist.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, final int position, long id) {
btpair.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
registerReceiver(mBroadcastReceiver3,filter);
if (Build.VERSION.SDK_INT>Build.VERSION_CODES.JELLY_BEAN_MR2){
bttDeviceList.get(position).createBond();
mBTDevice = bttDeviceList.get(position);
mBluetoothConnection = new BluetoothConnectionService(pulpit2kod.this);
}
}
});
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
Toast.makeText(pulpit2kod.this,"Wybierz pozycję, aby polaczyc", Toast.LENGTH_SHORT).show();
}
});
btconnect.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startConnection();
}
});
btsend.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
byte [] bytes = etsend.getText().toString().getBytes(Charset.defaultCharset());
mBluetoothConnection.write(bytes);
etsend.setText("");
}
});
//---------------------BT wyszikiwanie przycisk-----------------------------
btsearch.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
wyszukiwanie();
}
});
//---------------------BT widocznosc przycisk-------------------------------
btvisibility.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
Log.d(TAG, "onCreate: discoverability bt");
widocznosc();
}
});
//----------------------bluetooth przycisk----------------------------------
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
btONOFF.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d(TAG, "onClick: enabling/disabling bt");
enabledDisableBT();
}});
//--------------------- przycisk powrot do glownego menu----------------------
btgoto1screen.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d(TAG, "onClick: Powrot do menu");
Intent intent = new Intent(pulpit2kod.this, MainActivity.class);
startActivity(intent);
}
});
logobt();
}
public void startConnection(){
startBTConnection(mBTDevice,MY_UUID_INSECURE);
}
public void startBTConnection(BluetoothDevice device, UUID uuid){
Log.d(TAG, "startBTConnection: Initializing RFCOM Bluetooth Connection.");
mBluetoothConnection.startClient(device,uuid);
}
private void logobt() {
if (!mBluetoothAdapter.isEnabled()){
bttoff.setVisibility(View.VISIBLE);
btton.setVisibility(View.INVISIBLE);
}
if (mBluetoothAdapter.isEnabled()){
bttoff.setVisibility(View.INVISIBLE);
btton.setVisibility(View.VISIBLE);
}
}
private void wyszukiwanie() {
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
mBluetoothAdapter.startDiscovery();
if (mBluetoothAdapter.isDiscovering()){
mBluetoothAdapter.cancelDiscovery();
mBluetoothAdapter.startDiscovery();
}
if (!mBluetoothAdapter.isDiscovering()) {
mBluetoothAdapter.startDiscovery();
}
bttDeviceList.clear();
mDeviceList.clear();
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mReceiver,filter);
}
//------------------------- metoda widocznosc ----------------------------------------
private void widocznosc() {
Log.d(TAG, "widocznosc: Making device discoverable for 120 seconds");
Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
startActivity(discoverableIntent);
IntentFilter intentFilter = new IntentFilter(mBluetoothAdapter.ACTION_SCAN_MODE_CHANGED);
registerReceiver(mBroadcastReceiver2,intentFilter);
}
//-------------------------kompatybilność z BT i ON/OFF-------------------------------------
private void enabledDisableBT() {
if(mBluetoothAdapter ==null){
Log.d(TAG, "enabledDisableBT: BT not supported");
}
if(!mBluetoothAdapter.isEnabled()){
Intent enableBTIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivity(enableBTIntent);
IntentFilter BTIntent = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
registerReceiver(mBroadcastReceiver1, BTIntent);
bttDeviceList.clear();
mDeviceList.clear();
spinnerlist.setAdapter(null);
btton.setVisibility(View.VISIBLE);
bttoff.setVisibility(View.INVISIBLE);
}
if(mBluetoothAdapter.isEnabled()){
mBluetoothAdapter.disable();
IntentFilter BTInent = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
registerReceiver(mBroadcastReceiver1, BTInent);
bttoff.setVisibility(View.VISIBLE);
btton.setVisibility(View.INVISIBLE);
}
}
//----------------------------------------------------------------------------------------------
private final BroadcastReceiver mReceiver = 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);
bttDeviceList.add(device);
mDeviceList.add(device.getName()+": "+device.getAddress());
Log.d(TAG, "onReceive: Dodano"+device.getName()+": "+device.getAddress());
spinnerlist.setAdapter(new ArrayAdapter<String>(context,android.R.layout.simple_spinner_item,mDeviceList));
}
}
};
//---------------------------stan BT-------------------------------------------------------
private final BroadcastReceiver mBroadcastReceiver1 = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (action.equals(mBluetoothAdapter.ACTION_STATE_CHANGED)){
final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE,mBluetoothAdapter.ERROR);
switch (state){
case BluetoothAdapter.STATE_OFF:
Log.d(TAG, "onReceive: STATE OFF");
Toast.makeText(pulpit2kod.this ,"Turned off",Toast.LENGTH_SHORT).show();
break;
case BluetoothAdapter.STATE_TURNING_OFF:
Log.d(TAG, "onReceive: STATE TURNING OFF");
Toast.makeText(pulpit2kod.this ,"Turning off",Toast.LENGTH_SHORT).show();
break;
case BluetoothAdapter.STATE_TURNING_ON:
Log.d(TAG, "onReceive:STATE TURNING ON");
Toast.makeText(pulpit2kod.this ,"Turning on",Toast.LENGTH_SHORT).show();
break;
case BluetoothAdapter.STATE_ON:
Log.d(TAG, "onReceive: STATE ON");
Toast.makeText(pulpit2kod.this ,"Turned on",Toast.LENGTH_SHORT).show();
break;
}
}
}
};
private final BroadcastReceiver mBroadcastReceiver2 = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (action.equals(mBluetoothAdapter.ACTION_SCAN_MODE_CHANGED)){
int mode = intent.getIntExtra(BluetoothAdapter.EXTRA_SCAN_MODE,mBluetoothAdapter.ERROR);
switch (mode){
case BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE:
Log.d(TAG, "onReceive: Discoverability Enabled");
break;
case BluetoothAdapter.SCAN_MODE_CONNECTABLE:
Log.d(TAG, "onReceive: Discoverability Disabled. Able to recieve connections");
break;
case BluetoothAdapter.SCAN_MODE_NONE:
Log.d(TAG, "onReceive:Discoverability Disabled. Not able to recieve connections");
break;
case BluetoothAdapter.STATE_CONNECTING:
Log.d(TAG, "onReceive: Connecting");
break;
case BluetoothAdapter.STATE_CONNECTED:
Log.d(TAG, "onReceive: Connected");
break;
}
}
}
};
private final BroadcastReceiver mBroadcastReceiver3 = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (action.equals(BluetoothDevice.ACTION_BOND_STATE_CHANGED)){
BluetoothDevice mDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if (mDevice.getBondState()==BluetoothDevice.BOND_BONDED){
Toast.makeText(pulpit2kod.this,"Bonded",Toast.LENGTH_SHORT).show();
mBTDevice = mDevice;
}
if (mDevice.getBondState()==BluetoothDevice.BOND_BONDING){
Toast.makeText(pulpit2kod.this,"Bonding",Toast.LENGTH_SHORT).show();
}
if (mDevice.getBondState()==BluetoothDevice.BOND_NONE){
Toast.makeText(pulpit2kod.this,"Not bonded",Toast.LENGTH_SHORT).show();
}
}
}
};
BroadcastReceiver mBroadcastReceiver4 = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String text = intent.getStringExtra("theMessage");
messages.append(text +"n");
etreceive.setText(messages);
}
};
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(mBroadcastReceiver1);
unregisterReceiver(mBroadcastReceiver2);
unregisterReceiver(mBroadcastReceiver3);
unregisterReceiver(mBroadcastReceiver4);
unregisterReceiver(mReceiver);
}}
蓝牙连接服务
package com.example.mgr;
import android.app.ProgressDialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothServerSocket;
import android.bluetooth.BluetoothSocket;
import android.content.Context;
import android.content.Intent;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.util.UUID;
/**
* Created by User on 12/21/2016.
*/
public class BluetoothConnectionService {
private static final String TAG = "BluetoothConnectionServ";
private static final String appName = "MYAPP";
private static final UUID MY_UUID_INSECURE =
UUID.fromString("8ce255c0-200a-11e0-ac64-0800200c9a66");
private final BluetoothAdapter mBluetoothAdapter;
Context mContext;
private AcceptThread mInsecureAcceptThread;
private ConnectThread mConnectThread;
private BluetoothDevice mmDevice;
private UUID deviceUUID;
ProgressDialog mProgressDialog;
private ConnectedThread mConnectedThread;
public BluetoothConnectionService(Context context) {
mContext = context;
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
start();
}
/**
* This thread runs while listening for incoming connections. It behaves
* like a server-side client. It runs until a connection is accepted
* (or until cancelled).
*/
private class AcceptThread extends Thread {
// lokalny serwer
private final BluetoothServerSocket mmServerSocket;
public AcceptThread(){
BluetoothServerSocket tmp = null;
// nasluchiwanie
try{
tmp = mBluetoothAdapter.listenUsingInsecureRfcommWithServiceRecord(appName, MY_UUID_INSECURE);
Log.d(TAG, "AcceptThread: Setting up Server using: " + MY_UUID_INSECURE);
}catch (IOException e){
Log.e(TAG, "AcceptThread: IOException: " + e.getMessage() );
}
mmServerSocket = tmp;
}
public void run(){
Log.d(TAG, "run: AcceptThread Running.");
BluetoothSocket socket = null;
try{
Log.d(TAG, "run: RFCOM server socket start.....");
socket = mmServerSocket.accept();
Log.d(TAG, "run: RFCOM server socket accepted connection.");
}catch (IOException e){
Log.e(TAG, "AcceptThread: IOException: " + e.getMessage() );
}
if(socket != null){
connected(socket,mmDevice);
}
Log.i(TAG, "END mAcceptThread ");
}
public void cancel() {
Log.d(TAG, "cancel: Canceling AcceptThread.");
try {
mmServerSocket.close();
} catch (IOException e) {
Log.e(TAG, "cancel: Close of AcceptThread ServerSocket failed. " + e.getMessage() );
}
}
}
private class ConnectThread extends Thread {
private BluetoothSocket mmSocket;
public ConnectThread(BluetoothDevice device, UUID uuid) {
Log.d(TAG, "ConnectThread: started.");
mmDevice = device;
deviceUUID = uuid;
}
public void run(){
BluetoothSocket tmp = null;
Log.i(TAG, "RUN mConnectThread ");
// Get a BluetoothSocket for a connection with the
// given BluetoothDevice
try {
Log.d(TAG, "ConnectThread: Trying to create InsecureRfcommSocket using UUID: "
+MY_UUID_INSECURE );
tmp = mmDevice.createRfcommSocketToServiceRecord(deviceUUID);
} catch (IOException e) {
Log.e(TAG, "ConnectThread: Could not create InsecureRfcommSocket " + e.getMessage());
}
mmSocket = tmp;
mBluetoothAdapter.cancelDiscovery();
try {
mmSocket.connect();
Log.d(TAG, "run: ConnectThread connected.");
} catch (IOException e) {
try {
mmSocket.close();
Log.d(TAG, "run: Closed Socket.");
} catch (IOException e1) {
Log.e(TAG, "mConnectThread: run: Unable to close connection in socket " + e1.getMessage());
}
Log.d(TAG, "run: ConnectThread: Could not connect to UUID: " + MY_UUID_INSECURE );
}
connected(mmSocket,mmDevice);
}
public void cancel() {
try {
Log.d(TAG, "cancel: Closing Client Socket.");
mmSocket.close();
} catch (IOException e) {
Log.e(TAG, "cancel: close() of mmSocket in Connectthread failed. " + e.getMessage());
}
}
}
public synchronized void start() {
Log.d(TAG, "start");
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
if (mInsecureAcceptThread == null) {
mInsecureAcceptThread = new AcceptThread();
mInsecureAcceptThread.start();
}
}
public void startClient(BluetoothDevice device,UUID uuid){
Log.d(TAG, "startClient: Started.");
mProgressDialog = ProgressDialog.show(mContext,"Connecting Bluetooth"
,"Please Wait...",true);
mConnectThread = new ConnectThread(device, uuid);
mConnectThread.start();
}
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket) {
Log.d(TAG, "ConnectedThread: Starting.");
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
try{
mProgressDialog.dismiss();
}catch (NullPointerException e){
e.printStackTrace();
}
try {
tmpIn = mmSocket.getInputStream();
tmpOut = mmSocket.getOutputStream();
} catch (IOException e) {
e.printStackTrace();
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run(){
byte[] buffer = new byte[1024];
int bytes;
while (true) {
try {
bytes = mmInStream.read(buffer);
String incomingMessage = new String(buffer, 0, bytes);
Intent IncomingMessageIntent = new Intent("incomingMessage");
IncomingMessageIntent.putExtra("theMessage",incomingMessage);
LocalBroadcastManager.getInstance(mContext).sendBroadcast(IncomingMessageIntent);
} catch (IOException e) {
Log.e(TAG, "write: Error reading Input Stream. " + e.getMessage() );
break;
}
}
}
public void write(byte[] bytes) {
String text = new String(bytes, Charset.defaultCharset());
Log.d(TAG, "write: Writing to outputstream: " + text);
try {
mmOutStream.write(bytes);
} catch (IOException e) {
Log.e(TAG, "write: Error writing to output stream. " + e.getMessage() );
}
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) { }
}
}
private void connected(BluetoothSocket mmSocket, BluetoothDevice mmDevice) {
Log.d(TAG, "connected: Starting.");
// Start the thread to manage the connection and perform transmissions
mConnectedThread = new ConnectedThread(mmSocket);
mConnectedThread.start();
}
/**
* Write to the ConnectedThread in an unsynchronized manner
*
* @param out The bytes to write
* @see ConnectedThread#write(byte[])
*/
public void write(byte[] out) {
// Create temporary object
ConnectedThread r;
// Synchronize a copy of the ConnectedThread
Log.d(TAG, "write: Write Called.");
//perform the write
mConnectedThread.write(out);
}
}
您的代码似乎基于蓝牙聊天示例，具体取决于您尝试发送的代码，您的代码可能是正确的或完全不正确的。
如果您尝试将文本发送到笔记本电脑，则必须为rfcomm连接创建一个Windows应用程序(UWP，.NET，Win32，MFC，无论您想使用什么(。
如果您尝试发送文件，您有 2 个选项。
- 通过 OBEX 发送到笔记本电脑，您不必制作 Windows 程序。
- 通过RFCOMM发送文件，您必须制作一个Windows程序并制作自己的实现，以便在移动和PC软件中发送和接收文件。
如果您尝试发送自定义数据，则必须为rfcomm连接创建一个Windows应用程序(UWP，.NET，Win32，MFC，无论您要使用的任何内容(。