Java tutorial
//package com.java2s; /* * Copyright (C) 2014 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import android.bluetooth.BluetoothAdapter; public class Main { /** * Ensure Bluetooth is turned on. * * @throws IllegalStateException If {@code adapter} is null or Bluetooth state is not * {@link BluetoothAdapter#STATE_ON}. */ static void checkAdapterStateOn(BluetoothAdapter adapter) { if (adapter == null || adapter.getState() != BluetoothAdapter.STATE_ON) { throw new IllegalStateException("BT Adapter is not turned ON"); } } }