通知，如果蓝牙在Android应用程序关闭

Question

即时通讯目前正在对一个Android应用程序.. 我有，而应用程序是 当前运行.. 如何通知每当设备的蓝牙 关闭用户要通知远程设备达到BT是否关闭了 ？ 在此先感谢

Answer 1

注册广播接收器意图动作BluetoothAdapter.ACTION_STATE_CHANGED和移动你的notifiyng代码到onReceive方法。不要忘记检查，如果新的状态为OFF

if(BluetoothAdapter.ACTION_STATE_CHANGED.equals(intent.getAction())) { 
    if(intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, -1) 
     == BluetoothAdapter.STATE_OFF) 
     // Bluetooth was disconnected 
} 

Answer 2

如果你想在用户连接断开了蓝牙，后来检测，检测用户何时有自己的蓝牙断开连接，你应该做以下步骤：

1）获取用户BluetoothAdapter：

BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();  

2）创建和配置接收器，一个代码为这样：

private final BroadcastReceiver mReceiver = new BroadcastReceiver() { 

    @Override 
    public void onReceive(Context context, Intent intent) { 

     String action = intent.getAction(); 

     // It means the user has changed his bluetooth state. 
     if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) { 

      if (btAdapter.getState() == BluetoothAdapter.STATE_TURNING_OFF) { 
       // The user bluetooth is turning off yet, but it is not disabled yet. 
       return; 
      } 

      if (btAdapter.getState() == BluetoothAdapter.STATE_OFF) { 
       // The user bluetooth is already disabled. 
       return; 
      } 

     } 
    } 
};  

3）注册您的广播接收器到你的活动：

this.registerReceiver(mReceiver, new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED));