1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.camera.util; 18 19 import android.content.Context; 20 import android.support.annotation.NonNull; 21 22 /** 23 * Initializable singleton for providing the application level context 24 * object instead of initializing each singleton separately. 25 */ 26 public class AndroidContext { 27 private static AndroidContext sInstance; 28 29 /** 30 * The android context object cannot be created until the android 31 * has created the application object. The AndroidContext object 32 * must be initialized before other singletons can use it. 33 */ 34 public static void initialize(@NonNull Context context) { 35 if (sInstance == null) { 36 sInstance = new AndroidContext(context); 37 } 38 } 39 40 /** 41 * Return a previously initialized instance, throw if it has not been 42 * initialized yet. 43 */ 44 public static AndroidContext instance() { 45 if (sInstance == null) { 46 throw new IllegalStateException("Android context was not initialized."); 47 } 48 return sInstance; 49 } 50 51 private final Context mContext; 52 private AndroidContext(Context context) { 53 mContext = context; 54 } 55 56 public Context get() { 57 return mContext; 58 } 59 }
