private void scanLeDevice(final boolean enable) {
    if (enable) {
        mHandler.postDelayed(new Runnable() {
            @Override
            public void run() {
                mBluetoothAdapter.stopLeScan(mLeScanCallback);
                connectToDevice();
            }
        }, 15000);
        mBluetoothAdapter.startLeScan(mLeScanCallback);
    } else {
        mBluetoothAdapter.stopLeScan(mLeScanCallback);
    }
}