title: startLeScan replacement to current api
body: <p>Goal is to read the values of a bluetooth LE heart rate monitor.</p>
  
  <p>Using google's sample, I get</p>
  
  <pre><code>private void scanLeDevice(final boolean enable) {
      if (enable) {
          // Stops scanning after a pre-defined scan period.
          mHandler.postDelayed(new Runnable() {
              @Override
              public void run() {
                  mScanning = false;
                  mBluetoothAdapter.stopLeScan(mLeScanCallback);
              }
          }, SCAN_PERIOD);
  
          mScanning = true;
          mBluetoothAdapter.startLeScan(mLeScanCallback);
      } else {
          mScanning = false;
          mBluetoothAdapter.stopLeScan(mLeScanCallback);
      }
  }
  </code></pre>
  
  <p>which causes <code>mBluetoothAdapter.stopLeScan</code> to be shown as deprecated. Startscan is no method of <code>mBluetoothAdapter</code> though.</p>
  
  <p>How to change this for it to work with the current API?</p>