Question

我正在为Android开发一款具有BLE功能的应用程序，除非我尝试多次连接和断开BLE设备，否则它的工作原理非常好。在连接/断开几次成功尝试后，即使首先连接，BLE设备也会在随机时间间隔后直接调用断开连接功能。

public boolean connect(final String address)
{

  if (mBtAdapter == null || address == null) {
       Log.v("Notification", "BluetoothAdapter not initialized or unspecified address.");
       return false;
   }

   // Previously connected device.  Try to reconnect.
   //mBtDeviceAddress != null && address.equals(mBtDeviceAddress)&&
   if (deviceGatt.get(address) != null) {
       Log.v("Notification", "Trying to use an existing mBluetoothGatt for connection.");
       if (deviceGatt.get(address).connect()) {
           mConnectionState = STATE_CONNECTING;
           Log.v("Notification","Connection State :" +mConnectionState);
           return true;
       } else {
           return false;
       }
   }

   final BluetoothDevice device = mBtAdapter.getRemoteDevice(address);
   pairedDevice = device;
   if (device == null) {
       Log.v("Notification", "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.
   BluetoothGatt mBluetoothGatt = device.connectGatt(this,false,this.mGattCallBack);

   deviceGatt.put(address,mBluetoothGatt);

   Log.v("Notification", "Trying to create a new connection.");
   Log.v("Notification","Size of device gatt "+deviceGatt.size());
   mBtDeviceAddress = address;
   mConnectionState = STATE_CONNECTING;
   return true;
}

public boolean disconnect(BluetoothDevice device) {

   if (mBtAdapter == null || deviceGatt.get(device.getAddress()) == null) {
       Log.v("Notification", "BluetoothAdapter not initialized");
       return false;
   }
   //Log.v("Notification","Device Address : "+device.getAddress());
   deviceGatt.get(device.getAddress()).disconnect();
   //deviceGatt.get(device.getAddress()).close();
   return true;
}

Answer 1

我不确定这是否对您有用但我发现bluetoothGatt在大约4-7分钟后自动断开连接，如果没有调用通知或特征写入。通过每5秒调用一次BluetoothGatt.readRemoteRssi（）来解决这个问题。

@Override
public void onReadRemoteRssi(BluetoothGatt gatt,int rssi, int status){
    if (status == BluetoothGatt.GATT_SUCCESS)     
        System.out.println("onReadRemoteRssi: " + rssi);

    if (mBluetoothGatt != null) 
        myHandler.postDelayed(runnableReadRssi, 5000);
}

您还应确保关闭每个bluetoothGatt，并在不再需要它后设置为null。我已经读过，如果你有超过5个bluetoothGatts处于活动状态，你将收到一个关于无法连接到Gatt服务器的错误。

android 4.3 BLE设备在多次连接尝试后自动断开连接

1 个答案: