嘿，我想将我的应用程序与arduino设备连接... 为此，我将arduino蓝牙名称保存在字符串中，并且在发现期间我与蓝牙名称匹配，如果发现了该名称的任何设备，则可以 现在，我想与发现的设备连接，我已经尝试了代码，但是没有成功...我是一名学生初学者
public class MainActivity extends AppCompatActivity {
Button turn_on, discover, turn_off, connect;
private static final int REQUEST_ENABLE_BT = 99;
private static final int DISCOVERY_REQUEST = 1;
BluetoothAdapter mBluetoothAdapter;
BluetoothDevice bluetoothDevice;
String deviceName = "DESKTOP-ACSUIFS";
AlertDialog alertDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
turn_on = (Button) findViewById(R.id.turn_on);
turn_off = (Button) findViewById(R.id.turn_off);
discover = (Button) findViewById(R.id.Discover);
connect = (Button) findViewById(R.id.connect);
turn_on.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
Toast.makeText(MainActivity.this, "Bluetooth not Supported on this device", Toast.LENGTH_SHORT).show();
} else {
initializeBluetooth();
}
}
});
discover.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
discovery();
}
});
turn_off.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mBluetoothAdapter.isEnabled()) {
mBluetoothAdapter.disable();
}else{
Toast.makeText(MainActivity.this, "Bluetooth is already off", Toast.LENGTH_SHORT).show();
}
}
});
connect.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mBluetoothAdapter != null ) {
IntentFilter intent = new IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
registerReceiver(mPairReceiver, intent);
//pairDevice();
} else{
Toast.makeText(MainActivity.this, "Turn On bluetooth", Toast.LENGTH_SHORT).show();
}}
});
}
private final BroadcastReceiver mPairReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_BOND_STATE_CHANGED.equals(action)) {
final int state = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE, BluetoothDevice.ERROR);
final int prevState = intent.getIntExtra(BluetoothDevice.EXTRA_PREVIOUS_BOND_STATE, BluetoothDevice.ERROR);
if (state == BluetoothDevice.BOND_BONDED && prevState == BluetoothDevice.BOND_BONDING) {
Toast.makeText(context, "Paired", Toast.LENGTH_SHORT).show();
//showToast("Paired");
} else if (state == BluetoothDevice.BOND_NONE && prevState == BluetoothDevice.BOND_BONDED){
Toast.makeText(context, "Unpaired", Toast.LENGTH_SHORT).show();
//showToast("Unpaired");
}
}
}
};
private void initializeBluetooth() {
BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
mBluetoothAdapter = bluetoothManager.getAdapter();
if (mBluetoothAdapter == null || !mBluetoothAdapter.isEnabled()) {
Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
}else{
Toast.makeText(this, "Bluetooth already on!", Toast.LENGTH_SHORT).show();
}
}
private void discovery() {
if (mBluetoothAdapter != null ) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION}, 1001); //Any number
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
if (pairedDevices.size() > 0) {
// There are paired devices. Get the name and address of each paired device.
for (BluetoothDevice device : pairedDevices) {
String deviceNames = device.getName();
String deviceHardwareAddresses = device.getAddress(); // MAC address
}
}
IntentFilter filter = new IntentFilter();
filter.addAction(BluetoothDevice.ACTION_FOUND);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
registerReceiver(mReceiver, filter);
mBluetoothAdapter.startDiscovery();
Toast.makeText(MainActivity.this, "Scanning Arduino Devices", Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(this, "Please turn on the bluetooth", Toast.LENGTH_SHORT).show();
}
}
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) {
//discovery starts, we can show progress dialog or perform other tasks
//pd.setMessage("Please Wait Scanning your Arduino device");
//pd.show();
} else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
//discovery finishes, dismis progress dialog
// if(pd.isShowing()){
// pd.dismiss();
Toast.makeText(context, "No Arduino device. Please make sure that your device is switched on and Try Again! ", Toast.LENGTH_LONG).show();
//}
} else if (BluetoothDevice.ACTION_FOUND.equals(action)) {
//bluetooth device found
// if(pd.isShowing()){
// pd.dismiss();
// }
BluetoothDevice device = (BluetoothDevice) intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if(device.getName().equals(deviceName)) {
Toast.makeText(context, "Arduino device found " + device.getName(), Toast.LENGTH_SHORT).show();
// BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action);
}else if(!device.getName().equals(deviceName)){
Toast.makeText(context, "No Arduino device. Please make sure that your device is switched on and Try Again! ", Toast.LENGTH_LONG).show();
}
}
}
};
private void pairDevice(BluetoothDevice device) {
try {
Method method = device.getClass().getMethod("createBond", (Class[]) null);
method.invoke(device, (Object[]) null);
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void onDestroy() {
unregisterReceiver(mReceiver);
super.onDestroy();
}
}