Android 不连接蓝牙设备获取信号强度

原文：https://blog.csdn.net/uyy203/article/details/50771105

要拿到蓝牙信号指示值 rssi 分为两个步骤。

1.在oncreate方法里面增加 注册扫描广播

    public void onCreate(Bundle savedInstanceState) { 


        // 注册开始发现广播                        
        //当设备扫描得到蓝牙设备时触发，如果需要在连接设备后触发可使用ACTION_ACL_CONNECTED
        IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
        this.registerReceiver(mReceiver, filter); 
        }

2.新建BroadcastReceiver广播对象，并实现里面的onreceive方法,在onreceive得到rssi（信号强度）

private final BroadcastReceiver mReceiver = new BroadcastReceiver() { 


                @Override 
                public void onReceive(Context context, Intent intent) { 
                        String action = intent.getAction(); 

                        //当设备开始扫描时。 
                        if (BluetoothDevice.ACTION_FOUND.equals(action)) { 

                                //从Intent得到blueDevice对象 
                                BluetoothDevice device = intent 
                               .getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); 


if (device.getBondState() != BluetoothDevice.BOND_BONDED) { 

//信号强度。 
         short rssi = intent.getExtras().getShort( BluetoothDevice.EXTRA_RSSI); 
              } 
          }  
       } 
   };