我想开发像蓝牙 LE 外围设备这样的应用程序,它停止在与蓝牙 LE 中央设备连接时做广告,并限制与多个蓝牙 LE 中央设备连接的蓝牙 LE 外围设备。
一个蓝牙 LE 外围设备一次只能与一个蓝牙 LE 中心连接。 Bluetooth LE peripheral与Bluetooth LE central成功连接后,其他Bluetooth LE central设备无法扫描
直到现在我尝试下面的代码:
private final BluetoothGattServerCallback mGattServerCallback = new BluetoothGattServerCallback() {
@Override
public void onServiceAdded(int status, BluetoothGattService service) {
super.onServiceAdded(status, service);
}
@Override
public void onConnectionStateChange(BluetoothDevice device, final int status, int newState) {
super.onConnectionStateChange(device, status, newState);
if (status == BluetoothGatt.GATT_SUCCESS) {
if (newState == BluetoothGatt.STATE_CONNECTED) {
mBluetoothDevices.add(device);
// Bluetooth LE peripheral stop advertising on connect with Bluetooth LE central device
mAdvertiser.stopAdvertising(mAdvCallback);
Log.v(TAG, "Connected to device: " + device.getAddress());
} else if (newState == BluetoothGatt.STATE_DISCONNECTED) {
mBluetoothDevices.remove(device);
Log.v(TAG, "Disconnected from device");
}
} else {
mBluetoothDevices.remove(device);
// There are too many gatt errors (some of them not even in the documentation) so we just
// show the error to the user.
final String errorMessage = getString(R.string.status_errorWhenConnecting) + ": " + status;
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this, errorMessage, Toast.LENGTH_LONG).show();
}
});
Log.e(TAG, "Error when connecting: " + status);
}
}
@Override
public void onCharacteristicReadRequest(BluetoothDevice device, int requestId, int offset,
BluetoothGattCharacteristic characteristic) {
}
@Override
public void onNotificationSent(BluetoothDevice device, int status) {
super.onNotificationSent(device, status);
Log.v(TAG, "Notification sent. Status: " + status);
}
@Override
public void onCharacteristicWriteRequest(BluetoothDevice device, int requestId,
BluetoothGattCharacteristic characteristic, boolean preparedWrite, boolean responseNeeded, int offset, byte[] value) {
}
@Override
public void onDescriptorWriteRequest(BluetoothDevice device, int requestId,
BluetoothGattDescriptor descriptor, boolean preparedWrite, boolean responseNeeded,
int offset,
byte[] value) {
}
};
我在连接 BLE 中央设备时停止广告 mAdvertiser.stopAdvertising(mAdvCallback);
是断开连接。
请帮我解决这个用例。 提前致谢
最佳答案
在 stopAdvertising
之前将 BluetoothGattServer.connect(BluetoothDevice device, boolean autoConnect)
放在 BluetoothGatt.STATE_CONNECTED
中,因为预期的 Android 框架行为。如果需要继续持有链接,不想再打广告,需要调用额外的connect()
解决方案代码 fragment
//******************* SOLUTION **************************
BluetoothDevice mDevice = BluetoothAdapter.getDefaultAdapter().getRemoteDevice(device.getAddress());
mGattServer.connect(mDevice, false);
//*******************************************************
onConnectionStateChange() 实现的代码 fragment
@Override
public void onConnectionStateChange(BluetoothDevice device, final int status, int newState) {
super.onConnectionStateChange(device, status, newState);
if (status == BluetoothGatt.GATT_SUCCESS) {
if (newState == BluetoothGatt.STATE_CONNECTED) {
mBluetoothDevices.add(device);
//******************* SOLUTION **************************
BluetoothDevice mDevice = BluetoothAdapter.getDefaultAdapter().getRemoteDevice(device.getAddress());
mGattServer.connect(mDevice, false);
//*******************************************************
// Bluetooth LE peripheral stop advertising on connect with Bluetooth LE central device
mAdvertiser.stopAdvertising(mAdvCallback);
Log.v(TAG, "Connected to device: " + device.getAddress());
} else if (newState == BluetoothGatt.STATE_DISCONNECTED) {
mBluetoothDevices.remove(device);
Log.v(TAG, "Disconnected from device");
}
} else {
mBluetoothDevices.remove(device);
// There are too many gatt errors (some of them not even in the documentation) so we just
// show the error to the user.
final String errorMessage = getString(R.string.status_errorWhenConnecting) + ": " + status;
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this, errorMessage, Toast.LENGTH_LONG).show();
}
});
Log.e(TAG, "Error when connecting: " + status);
}
}
关于android - Bluetooth LE 外围设备在与 Bluetooth LE 中央设备连接时停止广告,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41184446/