public boolean connect(final String address) {
if (mBluetoothAdapter == null || address == null) {
L.e("BluetoothAdapter not initialized or unspecified address.");
return false;
}

    //如果以前连接过
    if (mBluetoothDeviceAddress != null && address.equals(mBluetoothDeviceAddress)
            && mBluetoothGatt != null) {
        L.e("Trying to use an existing mBluetoothGatt for connection.");
        if (mBluetoothGatt.connect()) {
            mConnectionState = STATE_CONNECTING;
            return true;
        } else {
            return false;
        }
    }
    //没有连接过
    bluetoothDevice = mBluetoothAdapter.getRemoteDevice(address);
    if (bluetoothDevice == null) {
        L.e("Device not found.  Unable to connect.");
        return false;
    }else{
        //false代表自动连接
        mBluetoothGatt = bluetoothDevice.connectGatt(this, false, mGattCallback);
        L.e("Trying to create a new connection.");
        mBluetoothDeviceAddress = address;
        mConnectionState = STATE_CONNECTING;
        return true;
    }
}

请问为什么我的手机蓝牙检测不到从机呢？