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直到現在我的應用程序可以發現使可發現和所有這些。當我按設備的名稱，例如我的手機附近（我已打開藍牙），它出現在我的listview事實上，我想當我按它，我有經典的錯誤< <「W/BluetoothAdapter：getBluetoothService（）調用沒有BluetoothManagerCallback W/System.err：java.io.IOException：讀取失敗，套接字可能關閉或超時，讀取ret ：-1「>>。它不能在我的代碼中工作bluetoothSocket.connect。 在其他情況下，當我用我的平板電腦（其中包括我的android工作室應用程序）進入我的汽車時，我可以搜索obd2，並且當我按下它時，它會生成債券需求。我鍵入1234密碼並製作債券在平板電腦藍牙功能，我可以看到它。我需要有人做了這樣的事情來幫助我進行下一步。例如，如何發送一個命令轉速或速度，並採取相應的措施。請幫助我！安卓與obd2的藍牙連接
這是我的代碼：
公共類BluetoothActivity延伸AppCompatActivity {
private static final String TAG ="msg" ;
private BluetoothAdapter bluetoothAdapter;
private ToggleButton toggleButton;
private ListView listview;
private ArrayAdapter adapter;
private static final int MESSAGE_READ =1;
private static final int ENABLE_BT_REQUEST_CODE = 1;
private static final int DISCOVERABLE_BT_REQUEST_CODE = 2;
private static final int DISCOVERABLE_DURATION = 300;
private final static UUID uuid = UUID.fromString("8ce255c0-200a-11e0-ac64-0800200c9a66");
// Create a BroadcastReceiver for ACTION_FOUND
private final BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// Whenever a remote Bluetooth device is found
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object from the Intent
BluetoothDevice bluetoothDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// Add the name and address to an array adapter to show in a ListView
adapter.add(bluetoothDevice.getName() + "\n"
+ bluetoothDevice.getAddress());
adapter.notifyDataSetChanged();
}
//uuid=BluetoothDevice.getUuids()[0].getUuid();
}
};
// IntentFilter的過濾器=新的IntentFilter（BluetoothDevice.ACTION_FOUND）;
// registerReceiver（廣播接收器，過濾器）//不要忘記的onDestroy
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bluetooth);
toggleButton = (ToggleButton) findViewById(R.id.toggleButton);
listview = (ListView) findViewById(R.id.listView);
//Listview Item Click Listener
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String itemValue = (String) listview.getItemAtPosition(position);
String MAC = itemValue.substring(itemValue.length() - 17);
BluetoothDevice bluetoothDevice = bluetoothAdapter.getRemoteDevice(MAC);
// Initiate a connection request in a separate thread
ConnectingThread t = new ConnectingThread(bluetoothDevice);
t.start();
}
});
adapter = new ArrayAdapter
(this, android.R.layout.simple_list_item_1);
listview.setAdapter(adapter);
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
}
//Οταν πατάμε το button για να ανοίξει το bluetooth!
public void onToggleClicked(View view) {
adapter.clear();
ToggleButton toggleButton = (ToggleButton) view;
if (bluetoothAdapter == null) {
// Device does not support Bluetooth
Toast.makeText(getApplicationContext(), "Η συσκευή δεν υποστηρίζει bluetooth.",
Toast.LENGTH_SHORT).show();
toggleButton.setChecked(false);
} else {
if (toggleButton.isChecked()){ // to turn on bluetooth
if (!bluetoothAdapter.isEnabled()) {
// A dialog will appear requesting user permission to enable Bluetooth
Intent enableBluetoothIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBluetoothIntent, ENABLE_BT_REQUEST_CODE);
} else {
Toast.makeText(getApplicationContext(), "Η Συσκευή είναι έτοιμη για χρήση." +
"\n" + "Ανίχνευση για Απομακρυσμένες Συσκευές...",
Toast.LENGTH_SHORT).show();
// To discover remote Bluetooth devices
discoverDevices();
// Make local device discoverable by other devices
makeDiscoverable();
}
} else { // Turn off bluetooth
bluetoothAdapter.disable();
adapter.clear();
Toast.makeText(getApplicationContext(), "Η συσκευή έχει Απενεργοποιηθεί.",
Toast.LENGTH_SHORT).show();
}
}
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == ENABLE_BT_REQUEST_CODE) {
// Bluetooth successfully enabled!
if (resultCode == Activity.RESULT_OK) {
Toast.makeText(getApplicationContext(), "Το Bluetooth έχει Ενεργοποιηθεί." +
"\n" + "Ανίχνευση για Απομακρυσμένες Συσκευές...",
Toast.LENGTH_SHORT).show();
// To discover remote Bluetooth devices
discoverDevices();
// Make local device discoverable by other devices
makeDiscoverable();
// Start a thread to create a server socket to listen
// for connection request
ListeningThread t = new ListeningThread();
t.start();
} else { // RESULT_CANCELED as user refused or failed to enable Bluetooth
Toast.makeText(getApplicationContext(), "Το Bluetooth δεν έχει Ενεργοποιηθεί.",
Toast.LENGTH_SHORT).show();
// Turn off togglebutton
toggleButton.setChecked(false);
}
} else if (requestCode == DISCOVERABLE_BT_REQUEST_CODE){
if (resultCode == DISCOVERABLE_DURATION){
Toast.makeText(getApplicationContext(), "Η συσκευή είναι τώρα Ανιχνεύσιμη απο άλλες συσκευές.. " +
DISCOVERABLE_DURATION + " Δευτερόλεπτα",
Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getApplicationContext(), "Αποτυχία να Ενεργοποιηθεί η Ανιχνευσημότητα της Συσκευής.",
Toast.LENGTH_SHORT).show();
}
}
}
protected void discoverDevices(){
// To scan for remote Bluetooth devices
if (bluetoothAdapter.startDiscovery()) {
Toast.makeText(getApplicationContext(), "Ανίχνευση για άλλες Συσκευές Bluetooth...",
Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getApplicationContext(), "Η Ανίχνευση Απέτυχε να αρχίσει.",
Toast.LENGTH_SHORT).show();
}
}
//Συνάρτηση για makeDiscoverable
protected void makeDiscoverable(){
// Make local device discoverable
Intent discoverableIntent = new
Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, DISCOVERABLE_DURATION);
startActivityForResult(discoverableIntent, DISCOVERABLE_BT_REQUEST_CODE);
}
@Override
protected void onResume() {
super.onResume();
// Register the BroadcastReceiver for ACTION_FOUND
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
this.registerReceiver(broadcastReceiver, filter);
}
//on pause an xreiastei na bei kwdikas{}
@Override
protected void onPause() {
super.onPause();
this.unregisterReceiver(broadcastReceiver);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.bluetooth, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
//Thread gia ton server..
private class ListeningThread extends Thread {
private final BluetoothServerSocket bluetoothServerSocket;
//Constructor
public ListeningThread() {
BluetoothServerSocket temp = null;
try {
temp = bluetoothAdapter.listenUsingRfcommWithServiceRecord(getString(R.string.app_name), uuid);
} catch (IOException e) {
e.printStackTrace();
}
bluetoothServerSocket = temp;
}
public void run() {
BluetoothSocket bluetoothSocket = null;
// This will block while listening until a BluetoothSocket is returned
// or an exception occurs
Log.d(TAG, "O kwdikas edw trexei");
while (true) {
try {
bluetoothSocket = bluetoothServerSocket.accept();
} catch (IOException e) {
break;
}
// If a connection is accepted
if (bluetoothSocket != null) {
//!!!!!!!!!!!!!!!!
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(getApplicationContext(), "Επιτυχής Σύνδεση με την συσκευή.",
Toast.LENGTH_SHORT).show();
}
});
ConnectedThread a = new ConnectedThread(bluetoothSocket);
a.start();
try {
bluetoothServerSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
break;
}
}
}
public void cancel() {
try {
bluetoothServerSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
private class ConnectingThread extends Thread{
private final BluetoothSocket bluetoothSocket;
private final BluetoothDevice bluetoothDevice ;
public ConnectingThread(BluetoothDevice device){
BluetoothSocket temp = null;
bluetoothDevice = device;
//Get a BluetoothSocket to connect with the given BluetoothDevice
try{
temp=bluetoothDevice.createInsecureRfcommSocketToServiceRecord(uuid);
}catch (IOException e){
e.printStackTrace();
}
bluetoothSocket = temp;
}
public void run() {
// Cancel discovery as it will slow down the connection
bluetoothAdapter.cancelDiscovery();
try {
bluetoothSocket.connect();
Log.d(TAG, "the code is running");
// This will block until it succeeds in connecting to the device
// through the bluetoothSocket or throws an exception
// bluetoothSocket.connect();
//isConnected = true;
} catch (IOException connectException) {
connectException.printStackTrace();
try {
//unable to connect
bluetoothSocket.close();
} catch (IOException closeException) {
closeException.printStackTrace();
}
}
// Do work to manage the connection (in a separate thread)
//manageConnectedSocket(bluetoothSocket);
ConnectedThread t= new ConnectedThread(bluetoothSocket);
t.start();
}
// Cancel an open connection and terminate the thread
public void cancel() {
try {
bluetoothSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
private class ConnectedThread extends Thread {
private final BluetoothSocket bluetoothSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
private android.os.Handler mHandler;
public ConnectedThread(BluetoothSocket socket) {
bluetoothSocket = 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 = new byte[1024]; // buffer store for the stream
int bytes; // bytes returned from read()
// Keep listening to the InputStream until an exception occurs
while (true) {
try {
// 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 {
bluetoothSocket.close();
mmInStream.close();
mmOutStream.close();
} catch (IOException e) { }
}
public void setmHandler(Handler mHandler) {
this.mHandler = mHandler;
}
}
}