android ble 蓝牙4.0开发日志（四）

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_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);                                                                                   }                                                           }                 }         };