我遇到了从我的Android设备向蓝牙设备发送命令的问题。
蓝牙与微控制器相关联。我的努力如下：
public class MainActivity extends AppCompatActivity {
private static final int REQUEST_ENABLE_BT = 2;
private BluetoothAdapter mBluetoothAdapter;
public static final String TAG = "CustomPOC BLEEEEEEE";
private Button btn_send;
private BluetoothDevice mdevice;
private Handler mHandler;
private ConnectThread mConnectThread;
private ConnectedThread mConnectedThread;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
btn_send = (Button)findViewById(R.id.senddata);
if (mBluetoothAdapter == null) {
Toast.makeText(this, "Bluetooth is not available", Toast.LENGTH_LONG).show();
finish();
return;
}
if (!mBluetoothAdapter.isEnabled()) {
Log.i(TAG, "onClick - BT not enabled yet");
Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
}
pairedOrNot();
btn_send.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mConnectThread = new ConnectThread(mdevice);
mConnectThread.start();
// new ConnectAsynk(mdevice).execute();
}
});
}
private void pairedOrNot() {
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
List<String> s = new ArrayList<String>();
for(BluetoothDevice bt : pairedDevices) {
s.add(bt.getAddress());
s.add(bt.getName());
if("08:7C:BE:00:00:01".equals(bt.getAddress())) {
mdevice = bt;
}
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case REQUEST_ENABLE_BT:
// When the request to enable Bluetooth returns
if (resultCode == Activity.RESULT_OK) {
Toast.makeText(this, "Bluetooth has turned on ", Toast.LENGTH_SHORT).show();
} else {
// User did not enable Bluetooth or an error occurred
Log.d(TAG, "BT not enabled");
Toast.makeText(this, "Problem in BT Turning ON ", Toast.LENGTH_SHORT).show();
finish();
}
break;
default:
Log.e(TAG, "wrong request code");
break;
}
}
private class ConnectThread extends Thread {
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;
private final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb");
public ConnectThread(BluetoothDevice device) {
BluetoothSocket tmp = null;
mmDevice = device;
try {
tmp = device.createInsecureRfcommSocketToServiceRecord(MY_UUID);
/*Method m = mmDevice.getClass().getMethod("createRfcommSocket", new Class[] {int.class});
tmp = (BluetoothSocket) m.invoke(device, 1);*/
System.out.println("BTTTTTTTTTTT Address "+mmDevice.getAddress());
BluetoothDevice hxm = BluetoothAdapter.getDefaultAdapter().getRemoteDevice(mmDevice.getAddress());
// Method m;
// m = hxm.getClass().getMethod("createRfcommSocket", new Class[]{int.class});
// tmp = (BluetoothSocket)m.invoke(hxm, Integer.valueOf(1));
}
catch (Exception e){
e.printStackTrace();
}
mmSocket = tmp;
}
public void run() {
mBluetoothAdapter.cancelDiscovery();
try {
mmSocket.connect();
// Reset the ConnectThread because we're done
synchronized (MainActivity.this) {
mConnectThread = null;
}
// Cancel the thread that completed the connection
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
ConnectedThread mConnectedThread = new ConnectedThread(mmSocket);
mConnectedThread.start();
} catch (IOException connectException) {
try {
connectException.printStackTrace();
mmSocket.close();
} catch (IOException closeException) { }
} catch (Exception ex){
ex.printStackTrace();
}
}
public void cancel(){
try {
mmSocket.close();
} catch (IOException e) { e.printStackTrace();}
}
}
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;
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) { e.printStackTrace();}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
byte[] buffer = new byte[1024];
int begin = 0;
int bytes = 0;
while (true) {
try {
bytes += mmInStream.read(buffer, bytes, buffer.length - bytes);
for(int i = begin; i < bytes; i++) {
if(buffer[i] == "1010101100000001000000100000000100001110".getBytes()[0]) {
mHandler.obtainMessage(1, begin, i, buffer).sendToTarget();
begin = i + 1;
if(i == bytes - 1) {
bytes = 0;
begin = 0;
}
}
}
} catch (IOException e) {
e.printStackTrace();
break;
}
}
}
public void write(byte[] bytes) {
try {
mmOutStream.write(bytes);
} catch (IOException e) {
e.printStackTrace();
}
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
当我通过
检查连接状态时，几乎没有提醒tmp.isConnected()
我发现它正在返回
错误
值。
我想将此命令（1010101100000001000000010000000100001110）发送到外部蓝牙。但是我遇到了问题。应用程序启动时的日志跟踪如下：
08-17 07:48:39.718: W/art(14551): Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.
drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList,
android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
点击按钮 btn_send 后，我会在日志跟踪中收到以下消息：
08-17 07:51:32.046: W/BluetoothAdapter(14984): getBluetoothService() called with no BluetoothManagerCallback
08-17 07:51:38.448: W/System.err(14984): java.io.IOException: read failed, socket might closed or timeout, read ret: -1
08-17 07:51:38.449: W/System.err(14984): at android.bluetooth.BluetoothSocket.readAll(BluetoothSocket.java:573)
08-17 07:51:38.449: W/System.err(14984): at android.bluetooth.BluetoothSocket.readInt(BluetoothSocket.java:584)
08-17 07:51:38.449: W/System.err(14984): at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:321)
08-17 07:51:38.449: W/System.err(14984): at com.mahmad.custompoc11aug.MainActivity$ConnectThread.run(MainActivity.java:164)
在调试之后我发现问题就在这一行
mmSocket.connect();
所有必需的权限都在清单文件中给出。请帮我解决这个问题。提前谢谢。
答案 0 :(得分：2)
我试过这个库。你也可以尝试一下 https://github.com/palaima/AndroidSmoothBluetooth
答案 1 :(得分：0)
正如您所提到的那样问题出现在mmSocket.connect();行上，问题不在于您发送命令但是创建连接时，即您无法在打开时检索BluetoothSocket或连接状态。
你应该怎么做？
尝试将以下代码与 UUID 一起使用，它对我的蓝牙加密狗有效。
UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
createInsecureRfcommSocketToServiceRecord(MY_UUID)
如果这对您有用，请告诉我。