Как убедиться, что устройство Android было отключено от устройства BLE?
У меня есть приложение для Android, которое используется с устройством BLE (BM70). Я могу подключиться к устройству BLE дважды, но в третий раз требуется некоторое время для фактического обнаружения устройства BLE. Я использовал другие приложения, которые могут последовательно обнаруживать устройство BLE более чем в два раза. Есть ли полезные методы для подключения? и отключить от устройства BLE? Это мой код для услуги:-
public class ServiceBTLE_GATT extends Service {
/**
* Service for managing connection and data communication with a GATT server hosted on a
* given Bluetooth LE device.
*/
private final static String TAG = ServiceBTLE_GATT.class.getSimpleName();
private BluetoothManager mBluetoothManager;
private BluetoothAdapter mBluetoothAdapter;
private String mBluetoothDeviceAddress;
private BluetoothGatt mBluetoothGatt;
private int mConnectionState = STATE_DISCONNECTED;
public static final int STATE_DISCONNECTED = 0;
public static final int STATE_CONNECTING = 1;
public static final int STATE_CONNECTED = 2;
public final static String ACTION_GATT_CONNECTED = "ServiceBTLE_GATT.ACTION_GATT_CONNECTED";
public final static String ACTION_GATT_DISCONNECTED = "ServiceBTLE_GATT.ACTION_GATT_DISCONNECTED";
public final static String ACTION_GATT_SERVICES_DISCOVERED = "ServiceBTLE_GATT.ACTION_GATT_SERVICES_DISCOVERED";
public final static String ACTION_DATA_AVAILABLE = "ServiceBTLE_GATT.ACTION_DATA_AVAILABLE";
public final static String EXTRA_UUID = "ServiceBTLE_GATT.EXTRA_UUID";
public final static String EXTRA_DATA = "ServiceBTLE_GATT.EXTRA_DATA";
// Implements callback methods for GATT events that the app cares about. For example,
// connection change and services discovered.
private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
String intentAction;
if (newState == BluetoothProfile.STATE_CONNECTED) {
intentAction = ACTION_GATT_CONNECTED;
mConnectionState = STATE_CONNECTED;
broadcastUpdate(intentAction);
Log.i(TAG, "Connected to GATT server.");
// Attempts to discover services after successful connection.
Log.i(TAG, "Attempting to start service discovery:" + mBluetoothGatt.discoverServices());
mBluetoothGatt.discoverServices();
} else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
intentAction = ACTION_GATT_DISCONNECTED;
mConnectionState = STATE_DISCONNECTED;
Log.i(TAG, "Disconnected from GATT server.");
broadcastUpdate(intentAction);
}
}
@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED);
} else {
Log.w(TAG, "onServicesDiscovered received: " + status);
}
}
@Override
public void onCharacteristicRead(BluetoothGatt gatt,
BluetoothGattCharacteristic characteristic,
int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
}
}
@Override
public void onCharacteristicChanged(BluetoothGatt gatt,
BluetoothGattCharacteristic characteristic) {
broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
}
// @Override
// public void onCharacteristicWrite(BluetoothGatt gatt,
// BluetoothGattCharacteristic characteristic, int status) {
//
// }
};
public void broadcastUpdate(final String action) {
final Intent intent = new Intent(action);
sendBroadcast(intent);
}
private void broadcastUpdate(final String action, final BluetoothGattCharacteristic characteristic) {
final Intent intent = new Intent(action);
intent.putExtra(EXTRA_UUID, characteristic.getUuid().toString());
// For all other profiles, writes the data formatted in HEX.
final byte[] data = characteristic.getValue();
if (data != null && data.length > 0) {
intent.putExtra(EXTRA_DATA, new String(data) + "\n" + Utils.hexToString(data));
} else {
intent.putExtra(EXTRA_DATA, "0");
}
sendBroadcast(intent);
}
public class BTLeServiceBinder extends Binder {
ServiceBTLE_GATT getService() {
return ServiceBTLE_GATT.this;
}
}
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
@Override
public void onCreate() {
}
@Override
public boolean onUnbind(Intent intent) {
// After using a given device, you should make sure that BluetoothGatt.close() is called
// such that resources are cleaned up properly. In this particular example, close() is
// invoked when the UI is disconnected from the Service.
disconnect();
mBluetoothGatt = null;
return super.onUnbind(intent);
}
private final IBinder mBinder = new BTLeServiceBinder();
/**
* Initializes a reference to the local Bluetooth adapter.
*
* @return Return true if the initialization is successful.
*/
public boolean initialize() {
// For API level 18 and above, get a reference to BluetoothAdapter through
// BluetoothManager.
if (mBluetoothManager == null) {
mBluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
if (mBluetoothManager == null) {
Log.e(TAG, "Unable to initialize BluetoothManager.");
return false;
}
}
mBluetoothAdapter = mBluetoothManager.getAdapter();
if (mBluetoothAdapter == null) {
Log.e(TAG, "Unable to obtain a BluetoothAdapter.");
return false;
}
return true;
}
/**
* Connects to the GATT server hosted on the Bluetooth LE device.
*
* @param address The device address of the destination device.
* @return Return true if the connection is initiated successfully. The connection result
* is reported asynchronously through the
* {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
* callback.
*/
public boolean connect(final String address) {
mBluetoothAdapter.cancelDiscovery();
if (mBluetoothAdapter == null || address == null) {
Log.w(TAG, "BluetoothAdapter not initialized or unspecified address.");
return false;
}
// Previously connected device. Try to reconnect.
if (mBluetoothDeviceAddress != null && address.equals(mBluetoothDeviceAddress) && mBluetoothGatt != null) {
Log.d(TAG, "Trying to use an existing mBluetoothGatt for connection.");
if (mBluetoothGatt.connect()) {
mConnectionState = STATE_CONNECTING;
return true;
} else {
return false;
}
}
final BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
if (device == null) {
Toast.makeText(this, "Device not found. Unable to connect.", Toast.LENGTH_SHORT).show();
return false;
}
// We want to directly connect to the device, so we are setting the autoConnect
// parameter to false.
if (mBluetoothGatt == null) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
mBluetoothGatt = device.connectGatt(this, false, mGattCallback, BluetoothDevice.TRANSPORT_LE);
}
Log.d(TAG, "Trying to create a new connection.");
mBluetoothDeviceAddress = address;
mConnectionState = STATE_CONNECTING;
} else {
mBluetoothGatt.discoverServices();
}
return true;
}
/**
* Disconnects an existing connection or cancel a pending connection. The disconnection result
* is reported asynchronously through the
* {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
* callback.
*/
public void disconnect() {
if (mBluetoothAdapter == null || mBluetoothGatt == null) {
Log.w(TAG, "BluetoothAdapter not initialized");
return;
}
mBluetoothGatt.disconnect();
mBluetoothGatt.close();
mBluetoothGatt = null;
// broadcastUpdate(ACTION_GATT_DISCONNECTED);
}
/**
* After using a given BLE device, the app must call this method to ensure resources are
* released properly.
*/
public void close() {
}
/**
* Request a read on a given {@code BluetoothGattCharacteristic}. The read result is reported
* asynchronously through the {@code BluetoothGattCallback#onCharacteristicRead(android.bluetooth.BluetoothGatt, android.bluetooth.BluetoothGattCharacteristic, int)}
* callback.
*
* @param characteristic The characteristic to read from.
*/
public void readCharacteristic(BluetoothGattCharacteristic characteristic) {
if (mBluetoothAdapter == null || mBluetoothGatt == null) {
Log.w(TAG, "BluetoothAdapter not initialized");
return;
}
mBluetoothGatt.readCharacteristic(characteristic);
}
/**
* Request a write on a given {@code BluetoothGattCharacteristic}. The write result is reported
* asynchronously through the {@code BluetoothGattCallback#onCharacteristicWrite(android.bluetooth.BluetoothGatt, android.bluetooth.BluetoothGattCharacteristic, int)}
* callback.
*
* @param characteristic The characteristic to read from.
*/
public void writeCharacteristic(BluetoothGattCharacteristic characteristic) {
if (mBluetoothAdapter == null || mBluetoothGatt == null) {
Log.w(TAG, "BluetoothAdapter not initialized");
return;
}
// try{
// Thread.sleep(1000);
// }catch (InterruptedException e)
// {
// Log.d("SleepLog",e.toString());
// }
mBluetoothGatt.writeCharacteristic(characteristic);
}
/**
* Enables or disables notification on a give characteristic.
*
* @param characteristic Characteristic to act on.
* @param enabled If true, enable notification. False otherwise.
*/
// public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic, boolean enabled) {
//
// if (mBluetoothAdapter == null || mBluetoothGatt == null) {
// Log.w(TAG, "BluetoothAdapter not initialized");
// return;
// }
//
// mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);
//
// BluetoothGattDescriptor descriptor = characteristic.getDescriptor(
// UUID.fromString(getString(R.string.CLIENT_CHARACTERISTIC_CONFIG)));
//
// if (enabled) {
// descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
// }
// else {
// descriptor.setValue(BluetoothGattDescriptor.DISABLE_NOTIFICATION_VALUE);
// }
//
// mBluetoothGatt.writeDescriptor(descriptor);
// }
/**
* Retrieves a list of supported GATT services on the connected device. This should be
* invoked only after {@code BluetoothGatt#discoverServices()} completes successfully.
*
* @return A {@code List} of supported services.
*/
public List<BluetoothGattService> getSupportedGattServices() {
if (mBluetoothGatt == null) {
return null;
}
return mBluetoothGatt.getServices();
}
}
Любая помощь или предложения приветствуются. Спасибо.