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Android BLE - 连接到多个设备似乎失败,两个连接的 GATT 响应是否相同?

转载 作者:行者123 更新时间:2023-11-29 01:23:30 24 4
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我正在开发一个连接到 BLE 设备并读取我需要检查的特定 GATT 特性和服务的 Android 应用程序。我使用 Android Dev 站点中的 BluetoothLeGATT 示例作为引用。我可以毫无问题地连接到预定义地址并读取 GATT 属性更新。

我接下来要做的是能够同时连接到两个 BLE 设备。然而,这似乎是一个挑战。

我所做的基本上是复制连接到单个 BLE 设备所需的代码。我有 2 个 BluetoothLeServices、2 个用于 GattCharacteristics 和 Gatt 服务数据的 ArrayLists,以及 2 个服务连接和 2 个用于 GattCallbacks 的广播接收器。

但是,在我的 GattCallback 函数中,我得到了相同的消息——就好像它们连接到同一个区域一样。这是我的代码:

public class MainActivity extends AppCompatActivity {

/*
UUIDs
Dog Block - 20:CD:39:87:DC:AA
Cat Block - 20:CD:39:87:DF:82
*/

private final String TAG = this.getClass().getSimpleName();

private BluetoothAdapter mBluetoothAdapter;
private Handler mHandler;

private static final int REQUEST_ENABLE_BT = 1;
private static final long SCAN_PERIOD = 10000;

private ArrayList<String> addressID = new ArrayList<>();
private ArrayList<BluetoothDevice> deviceList = new ArrayList<>();

private boolean mScanning = false;
private boolean mConnected = false;

private BluetoothLeService mBluetoothLeService;
private BluetoothLeService mBluetoothLeService1;

private ArrayList<ArrayList<BluetoothGattCharacteristic>> mGattCharacteristics =
new ArrayList<ArrayList<BluetoothGattCharacteristic>>();
private ArrayList<ArrayList<BluetoothGattCharacteristic>> mGattCharacteristics1 =
new ArrayList<ArrayList<BluetoothGattCharacteristic>>();


private final String LIST_NAME = "NAME";
private final String LIST_UUID = "UUID";

ArrayList<HashMap<String, String>> gattServiceData = new ArrayList<HashMap<String, String>>();
ArrayList<ArrayList<HashMap<String, String>>> gattCharacteristicData
= new ArrayList<ArrayList<HashMap<String, String>>>();
ArrayList<HashMap<String, String>> gattServiceData1 = new ArrayList<HashMap<String, String>>();
ArrayList<ArrayList<HashMap<String, String>>> gattCharacteristicData1
= new ArrayList<ArrayList<HashMap<String, String>>>();

private BluetoothGattCharacteristic mNotifyCharacteristic;
private BluetoothGattCharacteristic mNotifyCharacteristic1;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

mHandler = new Handler();

// Use this check to determine whether BLE is supported on the device. Then you can
// selectively disable BLE-related features.
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
Toast.makeText(this, R.string.ble_not_supported, Toast.LENGTH_SHORT).show();
finish();
}

// Initializes a Bluetooth adapter. For API level 18 and above, get a reference to
// BluetoothAdapter through BluetoothManager.
final BluetoothManager bluetoothManager =
(BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
mBluetoothAdapter = bluetoothManager.getAdapter();

// Checks if Bluetooth is supported on the device.
if (mBluetoothAdapter == null) {
Toast.makeText(this, R.string.error_bluetooth_not_supported, Toast.LENGTH_SHORT).show();
finish();
return;
}

addressID.add("20:CD:39:87:DC:AA");
addressID.add("20:CD:39:87:DF:82");
}



@Override
protected void onResume() {
super.onResume();

Log.e(TAG, "onResume");

// Ensures Bluetooth is enabled on the device. If Bluetooth is not currently enabled,
// fire an intent to display a dialog asking the user to grant permission to enable it.
if (!mBluetoothAdapter.isEnabled()) {
if (!mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}
}
scanLeDevice(true);

if (mBluetoothLeService != null) {

}

}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// User chose not to enable Bluetooth.
if (requestCode == REQUEST_ENABLE_BT && resultCode == Activity.RESULT_CANCELED) {
finish();
return;
}
super.onActivityResult(requestCode, resultCode, data);
}

@Override
protected void onPause() {
super.onPause();
scanLeDevice(false);
unregisterReceiver(mGattUpdateReceiver);
unregisterReceiver(mGattUpdateReceiver1);

}

@Override
protected void onDestroy() {
super.onDestroy();
unbindService(mServiceConnection);
mBluetoothLeService = null;
mBluetoothLeService1 = null;
}

private void scanLeDevice(final boolean enable) {
if (enable) {
Log.e(TAG, "scanLeDevice true");
// Stops scanning after a pre-defined scan period.
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
mScanning = false;
mBluetoothAdapter.stopLeScan(mLeScanCallback);
invalidateOptionsMenu();
}
}, SCAN_PERIOD);

mScanning = true;
mBluetoothAdapter.startLeScan(mLeScanCallback);
} else {
Log.e(TAG, "scanLeDevice false");
mScanning = false;
mBluetoothAdapter.stopLeScan(mLeScanCallback);
}
invalidateOptionsMenu();
}

// Device scan callback.
private BluetoothAdapter.LeScanCallback mLeScanCallback =
new BluetoothAdapter.LeScanCallback() {

@Override
public void onLeScan(final BluetoothDevice device, int rssi, byte[] scanRecord) {
runOnUiThread(new Runnable() {
@Override
public void run() {

deviceList.add(device);

Log.e(TAG, "deviceList count = " + deviceList.size());

if(deviceList.size() >= 2){
checkDevices();
}
}
});
}
};

private void checkDevices() {

Intent gattServiceIntent = new Intent(this, BluetoothLeService.class);
bindService(gattServiceIntent, mServiceConnection, BIND_AUTO_CREATE);

Intent gattServiceIntent1 = new Intent(this, BluetoothLeService.class);
bindService(gattServiceIntent1, mServiceConnection1, BIND_AUTO_CREATE);

registerReceiver(mGattUpdateReceiver, makeGattUpdateIntentFilter());
registerReceiver(mGattUpdateReceiver1, makeGattUpdateIntentFilter());
}

//TODO -- connect functions here
private static IntentFilter makeGattUpdateIntentFilter() {
final IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(BluetoothLeService.ACTION_GATT_CONNECTED);
intentFilter.addAction(BluetoothLeService.ACTION_GATT_DISCONNECTED);
intentFilter.addAction(BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED);
intentFilter.addAction(BluetoothLeService.ACTION_DATA_AVAILABLE);
return intentFilter;
}

// Code to manage Service lifecycle.
private final ServiceConnection mServiceConnection = new ServiceConnection() {

@Override
public void onServiceConnected(ComponentName componentName, IBinder service) {
mBluetoothLeService = ((BluetoothLeService.LocalBinder) service).getService();
if (!mBluetoothLeService.initialize()) {
Log.e(TAG, "Unable to initialize Bluetooth");
finish();
}
Log.e(TAG, "connecting to " + deviceList.get(0).getAddress());
mBluetoothLeService.connect("20:CD:39:87:DC:AA");
}
@Override
public void onServiceDisconnected(ComponentName componentName) {
mBluetoothLeService = null;
}
};
private final ServiceConnection mServiceConnection1 = new ServiceConnection() {

@Override
public void onServiceConnected(ComponentName componentName, IBinder service) {
mBluetoothLeService1 = ((BluetoothLeService.LocalBinder) service).getService();

if (!mBluetoothLeService1.initialize()) {
Log.e(TAG, "1Unable to initialize Bluetooth");
finish();
}
// Automatically connects to the device upon successful start-up initialization.
Log.e(TAG, "1connecting to " + deviceList.get(1).getAddress());
mBluetoothLeService1.connect("20:CD:39:87:DF:82");
}

@Override
public void onServiceDisconnected(ComponentName componentName) {
mBluetoothLeService = null;
}
};

private final BroadcastReceiver mGattUpdateReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (BluetoothLeService.ACTION_GATT_CONNECTED.equals(action)) {
Log.e(TAG, "connected");
} else if (BluetoothLeService.ACTION_GATT_DISCONNECTED.equals(action)) {
Log.e(TAG, "disconnected");
mConnected = false;
} else if (BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED.equals(action)) {
// Show all the supported services and characteristics on the user interface.
Log.e(TAG, "gatt services discovered");
displayGattServices(mBluetoothLeService.getSupportedGattServices());
} else if (BluetoothLeService.ACTION_DATA_AVAILABLE.equals(action)) {
Log.e(TAG, "data available");
String data = intent.getStringExtra(BluetoothLeService.EXTRA_DATA);
Log.e(TAG, "data is = " + data);
}
}
};

private final BroadcastReceiver mGattUpdateReceiver1 = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (BluetoothLeService.ACTION_GATT_CONNECTED.equals(action)) {
Log.e(TAG, "1connected");
} else if (BluetoothLeService.ACTION_GATT_DISCONNECTED.equals(action)) {
Log.e(TAG, "1disconnected");
mConnected = false;
} else if (BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED.equals(action)) {
// Show all the supported services and characteristics on the user interface.
Log.e(TAG, "1gatt services discovered");
displayGattServices1(mBluetoothLeService1.getSupportedGattServices());
} else if (BluetoothLeService.ACTION_DATA_AVAILABLE.equals(action)) {
Log.e(TAG, "1data available");
String data = intent.getStringExtra(BluetoothLeService.EXTRA_DATA);
Log.e(TAG, "1data is = " + data);
}
}
};

private void displayGattServices(List<BluetoothGattService> gattServices) {
if (gattServices == null) return;
Log.e(TAG, "display gatt services not null.");
String uuid = null;
String unknownServiceString = getResources().getString(R.string.unknown_service);
String unknownCharaString = getResources().getString(R.string.unknown_characteristic);

mGattCharacteristics = new ArrayList<ArrayList<BluetoothGattCharacteristic>>();

// Loops through available GATT Services.
for (BluetoothGattService gattService : gattServices) {
HashMap<String, String> currentServiceData = new HashMap<String, String>();
uuid = gattService.getUuid().toString();
currentServiceData.put(
LIST_NAME, SampleGattAttributes.lookup(uuid, unknownServiceString));
currentServiceData.put(LIST_UUID, uuid);
gattServiceData.add(currentServiceData);

ArrayList<HashMap<String, String>> gattCharacteristicGroupData =
new ArrayList<HashMap<String, String>>();
List<BluetoothGattCharacteristic> gattCharacteristics =
gattService.getCharacteristics();
ArrayList<BluetoothGattCharacteristic> charas =
new ArrayList<BluetoothGattCharacteristic>();

// Loops through available Characteristics.
for (BluetoothGattCharacteristic gattCharacteristic : gattCharacteristics) {
charas.add(gattCharacteristic);
HashMap<String, String> currentCharaData = new HashMap<String, String>();
uuid = gattCharacteristic.getUuid().toString();
currentCharaData.put(
LIST_NAME, SampleGattAttributes.lookup(uuid, unknownCharaString));
currentCharaData.put(LIST_UUID, uuid);
gattCharacteristicGroupData.add(currentCharaData);

if(uuid.equals(SampleGattAttributes.DOG_CHARACTERISTIC_CONFIG)){
Log.e(TAG, "uuid characteristic detected");

final int charaProp = gattCharacteristic.getProperties();
if ((charaProp | BluetoothGattCharacteristic.PROPERTY_READ) > 0) {
Log.e(TAG, "gatt characteristics read!");
// If there is an active notification on a characteristic, clear
// it first so it doesn't update the data field on the user interface.
if (mNotifyCharacteristic != null) {
mBluetoothLeService.setCharacteristicNotification(
mNotifyCharacteristic, false);
mNotifyCharacteristic = null;
}
mBluetoothLeService.readCharacteristic(gattCharacteristic);

}
if ((charaProp | BluetoothGattCharacteristic.PROPERTY_NOTIFY) > 0) {
Log.e(TAG, "gatt characteristics notify!");
mNotifyCharacteristic = gattCharacteristic;
mBluetoothLeService.setCharacteristicNotification(
gattCharacteristic, true);

}
}

}
mGattCharacteristics.add(charas);
gattCharacteristicData.add(gattCharacteristicGroupData);
}

}

private void displayGattServices1(List<BluetoothGattService> gattServices) {
if (gattServices == null) return;
Log.e(TAG, "1display gatt services not null.");
String uuid = null;
String unknownServiceString = getResources().getString(R.string.unknown_service);
String unknownCharaString = getResources().getString(R.string.unknown_characteristic);

mGattCharacteristics1 = new ArrayList<ArrayList<BluetoothGattCharacteristic>>();

// Loops through available GATT Services.
for (BluetoothGattService gattService : gattServices) {
HashMap<String, String> currentServiceData = new HashMap<String, String>();
uuid = gattService.getUuid().toString();
currentServiceData.put(
LIST_NAME, SampleGattAttributes.lookup(uuid, unknownServiceString));
currentServiceData.put(LIST_UUID, uuid);
gattServiceData1.add(currentServiceData);

ArrayList<HashMap<String, String>> gattCharacteristicGroupData =
new ArrayList<HashMap<String, String>>();
List<BluetoothGattCharacteristic> gattCharacteristics =
gattService.getCharacteristics();
ArrayList<BluetoothGattCharacteristic> charas =
new ArrayList<BluetoothGattCharacteristic>();

// Loops through available Characteristics.
for (BluetoothGattCharacteristic gattCharacteristic : gattCharacteristics) {
charas.add(gattCharacteristic);
HashMap<String, String> currentCharaData = new HashMap<String, String>();
uuid = gattCharacteristic.getUuid().toString();
currentCharaData.put(
LIST_NAME, SampleGattAttributes.lookup(uuid, unknownCharaString));
currentCharaData.put(LIST_UUID, uuid);
gattCharacteristicGroupData.add(currentCharaData);

if (uuid.equals(SampleGattAttributes.DOG_CHARACTERISTIC_CONFIG)) {
Log.e(TAG, "1uuid characteristic detected");

final int charaProp = gattCharacteristic.getProperties();
if ((charaProp | BluetoothGattCharacteristic.PROPERTY_READ) > 0) {
Log.e(TAG, "1gatt characteristics read!");
// If there is an active notification on a characteristic, clear
// it first so it doesn't update the data field on the user interface.
if (mNotifyCharacteristic1 != null) {
mBluetoothLeService1.setCharacteristicNotification(
mNotifyCharacteristic1, false);
mNotifyCharacteristic1 = null;
}
mBluetoothLeService1.readCharacteristic(gattCharacteristic);

}
if ((charaProp | BluetoothGattCharacteristic.PROPERTY_NOTIFY) > 0) {
Log.e(TAG, "1gatt characteristics notify!");
mNotifyCharacteristic1 = gattCharacteristic;
mBluetoothLeService1.setCharacteristicNotification(
gattCharacteristic, true);

}
}

}
mGattCharacteristics1.add(charas);
gattCharacteristicData1.add(gattCharacteristicGroupData);
}

}
}

我所做的是,一旦获得我想要连接的 2 个地址,我就会初始化所有必要的连接、服务和广播接收器。但是,我收到的 bluetoothLeGatt 消息是一样的。根据它连接到 Dog 或 Cat block ,我会得到以下几行:

data = dog
1data = dog

来自 LogCat。似乎它们连接到同一台设备。

我检查了我的代码,我什至硬编码了地址,但无济于事。

最佳答案

我已经与多台设备建立了连接并且工作正常。我还制作了一项用于扫描的服务和一项用于每次 ble 通信的服务。

请确保不要在通信部分使用绑定(bind)服务,因为断开连接可能是个问题(在我的情况下)。

对于扫描部分,我制作了一个字符串列表,其中包含 Mac 地址。当我在我的扫描仪中找到一个设备时,我通过 broadcastreceiver 将该设备发送到我的主要 Activity ,然后我将它传输到它的服务。所以每个连接都在自己的服务中运行,有自己的广播接收器和过滤器设置。

为确保这不是您的广播接收器的问题,请在您立即显示输出的每个服务中创建一个控制台日志。我怀疑您的设备与同一服务器有两个连接。

关于Android BLE - 连接到多个设备似乎失败,两个连接的 GATT 响应是否相同?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35406168/

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