我使用以下方法连接到蓝牙设备：
/**
* 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) {
if (mBluetoothAdapter == null || address == null) {
Log.e(TAG, "BluetoothAdapter not initialized or unspecified address.");
return false;
}
// Previously connected device. Try to reconnect.
if (mBluetoothDeviceAddress != null && address.equals(mBluetoothDeviceAddress)
&& mBluetoothGatt != null) {
Log.e(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) {
Log.e(TAG, "Device not found. Unable to connect.");
return false;
}
// We want to directly connect to the device, so we are setting the autoConnect
// parameter to false.
mBluetoothGatt = device.connectGatt(this, false, mGattCallback);
Log.e(TAG, "Trying to create a new connection.");
mBluetoothDeviceAddress = address;
mConnectionState = STATE_CONNECTING;
return true;
}
这是我的BluetoothGattCallback：
private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
String intentAction;
Log.e(TAG, "In onConnectionStateChange and there has been a change of :" +newState);
if (newState == BluetoothProfile.STATE_CONNECTED) {
intentAction = ACTION_GATT_CONNECTED;
mConnectionState = STATE_CONNECTED;
broadcastUpdate(intentAction);
Log.e(TAG, "Connected to GATT server.");
// Attempts to discover services after successful connection.
Log.e(TAG, "Attempting to start service discovery:");
try {
sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
Boolean discover = mBluetoothGatt.discoverServices();
if (discover == true) {
//Raise flag
unstableBluetoothBehaviour = true;
Log.e(TAG, "Service discovery returns true and is started");
} else {
Log.e(TAG, "Service discovery returns false and has stopped unexpectedly");
}
} else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
intentAction = ACTION_GATT_DISCONNECTED;
mConnectionState = STATE_DISCONNECTED;
if (unstableBluetoothBehaviour == true) {
Log.e(TAG, "Unstable behaviour detected");
}
Log.e(TAG, "Disconnected from GATT server.");
broadcastUpdate(intentAction);
close();
}
}
@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
Log.e(TAG, "In onServicesDiscovered");
if (status == BluetoothGatt.GATT_SUCCESS) {
Log.e(TAG, "mBluetoothGatt = " + mBluetoothGatt);
broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED);
} else {
Log.e(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);
Log.e(TAG, "Characteristic has been updated = " + characteristic);
}
};
问题在于，当我调用Connect（）时，将使用STATE_CONNECTED调用onConnectionChange（）。然后使用STATE_DISCONNECTED再次调用它！
这是 Logcat 的印刷品，它可能有助于您解决问题：
11-01 12:42:29.082 17969-17969/com.bluemaestro.tempo_utility D/ViewRootImpl: #3 mView = null
11-01 12:42:29.172 17969-17969/com.bluemaestro.tempo_utility D/ViewRootImpl: MSG_RESIZED_REPORT: ci=Rect(0, 24 - 0, 0) vi=Rect(0, 24 - 0, 0) or=1
11-01 12:42:29.242 17969-17969/com.bluemaestro.tempo_utility E/BlueMaestro: onServiceConnected mService= com.bluemaestro.tempo_utility.delivery_monitor.MyUARTService@dd6c856
11-01 12:42:29.242 17969-17969/com.bluemaestro.tempo_utility D/BluetoothGatt: connect() - device: ED:90:ED:F9:4C:60, auto: false
registerApp()
registerApp() - UUID=b3664342-0b17-427b-b32b-048726bc32de
11-01 12:42:29.282 17969-17987/com.bluemaestro.tempo_utility D/BluetoothGatt: onClientRegistered() - status=0 clientIf=7
11-01 12:42:29.292 17969-17969/com.bluemaestro.tempo_utility E/MyUARTService: Trying to create a new connection.
11-01 12:42:29.322 17969-17969/com.bluemaestro.tempo_utility I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@574a141 time:88055063
Timeline: Activity_idle id: android.os.BinderProxy@c3710fb time:88055065
11-01 12:42:29.512 17969-17969/com.bluemaestro.tempo_utility V/ActivityThread: updateVisibility : ActivityRecord{2870b81 token=android.os.BinderProxy@c3710fb {com.bluemaestro.tempo_utility/com.bluemaestro.tempo_utility.delivery_monitor.ConnectSensorActivity}} show : false
11-01 12:42:30.482 17969-17981/com.bluemaestro.tempo_utility D/BluetoothGatt: onClientConnectionState() - status=0 clientIf=7 device=ED:90:ED:F9:4C:60
11-01 12:42:30.492 17969-17981/com.bluemaestro.tempo_utility E/MyUARTService: In onConnectionStateChange and there has been a change of :2
Connected to GATT server.
Attempting to start service discovery:
11-01 12:42:30.502 17969-17969/com.bluemaestro.tempo_utility E/BlueMaestro: UART_CONNECT_MSG
11-01 12:42:32.502 17969-17981/com.bluemaestro.tempo_utility D/BluetoothGatt: discoverServices() - device: ED:90:ED:F9:4C:60
11-01 12:42:32.502 17969-17981/com.bluemaestro.tempo_utility E/MyUARTService: Service discovery returns true and is started
11-01 12:42:32.502 17969-17981/com.bluemaestro.tempo_utility D/BluetoothGatt: onClientConnParamsChanged() - Device=ED:90:ED:F9:4C:60 interval=6 status=0
onClientConnParamsChanged() - Device=ED:90:ED:F9:4C:60 interval=39 status=0
11-01 12:42:32.512 17969-17981/com.bluemaestro.tempo_utility D/BluetoothGatt: onSearchComplete() = Device=ED:90:ED:F9:4C:60 Status=0
11-01 12:42:32.512 17969-17981/com.bluemaestro.tempo_utility E/MyUARTService: In onServicesDiscovered
mBluetoothGatt = android.bluetooth.BluetoothGatt@e01b0d7
11-01 12:42:32.512 17969-17969/com.bluemaestro.tempo_utility E/BlueMaestro: ENABLETXNOTIFICATION
11-01 12:42:36.092 17969-17980/com.bluemaestro.tempo_utility D/BluetoothGatt: onClientConnParamsChanged() - Device=ED:90:ED:F9:4C:60 interval=159 status=0
11-01 12:42:56.842 17969-17969/com.bluemaestro.tempo_utility D/BluetoothAdapter: stopLeScan()
STATE_ON
STATE_ON
scan not started yet
11-01 12:43:00.762 17969-17981/com.bluemaestro.tempo_utility D/BluetoothGatt: onClientConnectionState() - status=19 clientIf=7 device=ED:90:ED:F9:4C:60
11-01 12:43:00.762 17969-17981/com.bluemaestro.tempo_utility E/MyUARTService: In onConnectionStateChange and there has been a change of :0
Unstable behaviour detected
Disconnected from GATT server.
mBluetoothGatt closed
11-01 12:43:00.762 17969-17981/com.bluemaestro.tempo_utility D/BluetoothGatt: close()
11-01 12:43:00.762 17969-17969/com.bluemaestro.tempo_utility E/BlueMaestro: UART_DISCONNECT_MSG
11-01 12:43:00.762 17969-17969/com.bluemaestro.tempo_utility E/MyUARTService: mBluetoothGatt closed
11-01 12:43:00.762 17969-17969/com.bluemaestro.tempo_utility D/BluetoothGatt: close()
11-01 12:43:00.772 17969-17981/com.bluemaestro.tempo_utility D/BluetoothGatt: unregisterApp() - mClientIf=7
11-01 12:43:00.772 17969-17969/com.bluemaestro.tempo_utility D/BluetoothGatt: unregisterApp() - mClientIf=7
11-01 12:44:28.422 17969-17969/com.bluemaestro.tempo_utility V/ActivityThread: updateVisibility : ActivityRecord{7e3fdc4 token=android.os.BinderProxy@574a141 {com.bluemaestro.tempo_utility/com.bluemaestro.tempo_utility.delivery_monitor.DashboardActivity}} show : true
11-01 12:49:51.792 17969-17969/com.bluemaestro.tempo_utility I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@574a141 time:88497537
另一只日志猫，我却未更改任何代码：
11-01 14:07:25.892 21448-21448/com.bluemaestro.tempo_utility E/MyUARTService: Trying to create a new connection.
11-01 14:07:25.892 21448-21462/com.bluemaestro.tempo_utility D/BluetoothGatt: onClientRegistered() - status=0 clientIf=7
11-01 14:07:25.902 21448-21448/com.bluemaestro.tempo_utility I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@3cd6867 time:93151645
Timeline: Activity_idle id: android.os.BinderProxy@a2ac28a time:93151645
11-01 14:07:26.112 21448-21448/com.bluemaestro.tempo_utility V/ActivityThread: updateVisibility : ActivityRecord{258b2e1 token=android.os.BinderProxy@a2ac28a {com.bluemaestro.tempo_utility/com.bluemaestro.tempo_utility.delivery_monitor.ConnectSensorActivity}} show : false
11-01 14:07:30.902 21448-21462/com.bluemaestro.tempo_utility D/BluetoothGatt: onClientConnectionState() - status=133 clientIf=7 device=ED:90:ED:F9:4C:60
11-01 14:07:30.902 21448-21462/com.bluemaestro.tempo_utility E/MyUARTService: In onConnectionStateChange and there has been a change of :0
11-01 14:07:30.902 21448-21462/com.bluemaestro.tempo_utility E/MyUARTService: Disconnected from GATT server.
mBluetoothGatt closed
11-01 14:07:30.902 21448-21462/com.bluemaestro.tempo_utility D/BluetoothGatt: close()
unregisterApp() - mClientIf=7
11-01 14:07:30.902 21448-21448/com.bluemaestro.tempo_utility E/BlueMaestro: UART_DISCONNECT_MSG
11-01 14:07:30.902 21448-21448/com.bluemaestro.tempo_utility E/MyUARTService: mBluetoothGatt closed
11-01 14:07:30.902 21448-21448/com.bluemaestro.tempo_utility D/BluetoothGatt: close()
11-01 14:07:30.912 21448-21448/com.bluemaestro.tempo_utility D/BluetoothGatt: unregisterApp() - mClientIf=7
11-01 14:07:50.572 21448-21448/com.bluemaestro.tempo_utility D/BluetoothAdapter: stopLeScan()
STATE_ON
STATE_ON
scan not started yet
答案 0 :(得分：0)
1-确保连接到正确的设备。蓝牙扫描器将扫描许多设备，并可能找到无法连接的设备（以与我们连接到BLE设备相同的方式）
2-确保在尝试连接之前或之后不要呼叫-std=c++11。在成功获得连接状态2（已连接）之后，请拨打电话