android获取bluetooth的信号强度(RSSI)

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。
                             IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_ACL_CONNECTED);
                             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);

                                }

                        }
                }
        };

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