我正在开发一个蓝牙应用程序来控制Arduino板，但现在我犯了一些错误：当我尝试通过手机建立连接时，它显示AlertDialog（没关系）很多Toasts（他们从onSensorChanged调用）。
连接到主板的BT模块都可以（与其他应用程序一起测试），所以问题是Java：我无法连接到我的BT模块。不幸的是，Android Studio并没有给我任何logcat或错误。
这是我的代码：
/* imports... */
public class MainActivity extends AppCompatActivity implements SensorEventListener {
/* Bluetooth */
private static final int REQUEST_ENABLE_BT = 1;
private String selectedDevice = "";
static final UUID defaultUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); //This SPP UUID should work for most devices.
//private boolean isConnected = false;
BluetoothAdapter bluetoothAdapter;
BluetoothSocket bluetoothSocket;
/* Is in full screen = ? */
private boolean FullScreenState = true;
/* Views */
private SeekBar steeringWheel;
private SeekBar forwardsSpeed;
private SeekBar backwardsSpeed;
private Toolbar toolbar;
/* Dialogs */
AlertDialog.Builder errorDialog;
AlertDialog.Builder listDialog;
ProgressDialog progressDialog;
/* Accelerometer managers */
Sensor accelerometer;
SensorManager sensorManager;
float Y = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
(...)
/* Views */
steeringWheel = (SeekBar) findViewById(R.id.Steering_wheel);
forwardsSpeed = (SeekBar) findViewById(R.id.Forwards_speed);
backwardsSpeed = (SeekBar) findViewById(R.id.Backwards_speed);
/* listDialogs */
listDialog = new AlertDialog.Builder(this);
listDialog.setCancelable(true);
listDialog.setTitle(R.string.app_name);
//listDialog.setMessage("Select a device:");
listDialog.setIcon(R.drawable.launcher_icon);
//listDialog.setView(devicesListView);
listDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
/* errorDialog */
errorDialog = new AlertDialog.Builder(this);
errorDialog.setCancelable(false);
errorDialog.setTitle(R.string.app_name);
errorDialog.setIcon(R.drawable.error_material);
errorDialog.setPositiveButton("I got it", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
/* Set the full screen and keep the screen always on... */
/* Accelerometer initializer... */
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
...
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
...
if (id == R.id.toolbar_connect) {
initializeBT();
return true;
} else if (id == R.id.toolbar_settings) {
/* Settings activity. Coming soon. */
return true;
} else if (id == R.id.toolbar_disconnect) {
if (bluetoothSocket != null) {
try {
bluetoothSocket.close();
} catch (IOException e) {
errorDialog.setMessage("Disconnection error!");
errorDialog.show();
}
}
return true;
}
...
}
@Override
public void onSensorChanged(SensorEvent event) {
/* Get the axes */
Y = event.values[1];
/* Set the steering wheel position */
steeringWheel.setProgress((int)Y + 10);
send(String.valueOf(steeringWheel.getProgress()));
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
...
}
private class connect extends AsyncTask<Void, Void, Void> {
private boolean connectionSuccess = false;
@Override
protected void onPreExecute() {
progressDialog = ProgressDialog.show(MainActivity.this, "Connecting...", "Creating bluetooth connection");
}
@Override
protected Void doInBackground(Void... devices) {
try {
if (bluetoothSocket == null) {
//if ((bluetoothSocket == null) || (!isConnected)) {
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
BluetoothDevice arduino = bluetoothAdapter.getRemoteDevice(selectedDevice);
bluetoothSocket = arduino.createInsecureRfcommSocketToServiceRecord(defaultUUID);
BluetoothAdapter.getDefaultAdapter().cancelDiscovery();
bluetoothSocket.connect();
connectionSuccess = true;
}
} catch (IOException e) {
connectionSuccess = false;
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (!connectionSuccess) {
errorDialog.setMessage("Connection error!");
errorDialog.show();
bluetoothSocket = null;
} else {
Toast.makeText(getApplicationContext(), "Successfully connected", Toast.LENGTH_LONG).show();
//isConnected = true;
}
progressDialog.dismiss();
}
}
void initializeBT() {
/* Check for Bluetooth support */
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null) {
errorDialog.setMessage("Unfortunately, Bluetooth connection isn't supported on your device.");
errorDialog.show();
} else if (!bluetoothAdapter.isEnabled()) {
/* Bluetooth disables -> enable it */
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
} else {
devicesPrompt();
}
}
void devicesPrompt() {
//final ArrayList<String> devicesList = new ArrayList()<String>;
Set<BluetoothDevice> pairedDevices;
final ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);
pairedDevices = bluetoothAdapter.getBondedDevices();
if (pairedDevices.size() > 0) {
for(BluetoothDevice bluetoothDevice : pairedDevices) {
/* Get the device's name and the address */
//devicesList.add(bt.getName() + "\n" + bt.getAddress());
adapter.add(bluetoothDevice.getName() + "\n" + bluetoothDevice.getAddress());
}
} else {
Toast.makeText(getApplicationContext(), "No paired Bluetooth devices found!", Toast.LENGTH_LONG).show();
}
listDialog.setAdapter(adapter, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//Log.d("RoverBluetooth!!", String.valueOf(which));
//;
String info = adapter.getItem(which);
selectedDevice = info.substring(info.length() - 17);
new connect().execute();
dialog.dismiss();
}
});
listDialog.show();
}
public void send(String message) {
message = message + "/r";
if (bluetoothSocket != null) {
try {
bluetoothSocket.getOutputStream().write(message.getBytes());
} catch (IOException e) {
Toast.makeText(getApplicationContext(), "Error during sending", Toast.LENGTH_SHORT).show();
Log.d("RoverBluetooth errors", e.toString());
}
}
}
public void buttonsActions(View view) {
int viewId = view.getId();
if (viewId == R.id.Forwards_button) { //ON
send(String.valueOf(forwardsSpeed.getProgress() + 1000));
} else if (viewId == R.id.Stop_button) { //OFF
send("21");
} else if (viewId == R.id.Backwards_button) { //Backwards
send(String.valueOf(backwardsSpeed.getProgress() + 1500));
} else if (viewId == R.id.Light_ON) { //Light ON
send("22");
} else if (viewId == R.id.Light_OFF) { //Light OFF
send("23");
}
}
}
答案 0 :(得分：1)
我已经编写了一个类来在Android和Arduino之间建立蓝牙连接。我想你使用的是HC-06（或-05？）。我的代码在github上：
<强> https://github.com/omaflak/Bluetooth-Android
我还在我的博客上写了一个教程，你可能想看看它：
<强> https://causeyourestuck.io/2015/12/14/communication-between-android-and-hc-06-module/
祝你好运！