1 /* 2 * Copyright (C) 2020 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 android.annotation; 18 19 import static java.lang.annotation.ElementType.FIELD; 20 import static java.lang.annotation.ElementType.METHOD; 21 import static java.lang.annotation.ElementType.PARAMETER; 22 import static java.lang.annotation.ElementType.TYPE; 23 import static java.lang.annotation.RetentionPolicy.SOURCE; 24 25 import java.lang.annotation.Retention; 26 import java.lang.annotation.Target; 27 28 /** 29 * Denotes a {@link android.content.Context} that can be used to create UI, meaning that it can 30 * provide a {@link android.view.Display} via {@link android.content.Context#getDisplay} and can be 31 * used to obtain a {@link android.view.WindowManager}, {@link android.view.LayoutInflater} or 32 * {@link android.app.WallpaperManager} via 33 * {@link android.content.Context#getSystemService(String)}. A {@link android.content.Context} 34 * which is marked as {@link UiContext} implies that the {@link android.content.Context} is also a 35 * {@link android.view.DisplayContext}. 36 * <p> 37 * This kind of {@link android.content.Context} is usually an {@link android.app.Activity} or 38 * created via {@link android.content.Context#createWindowContext(int, android.os.Bundle)}. 39 * </p> 40 * This is a marker annotation and has no specific attributes. 41 * 42 * @see android.content.Context#getDisplay() 43 * @see android.content.Context#getSystemService(String) 44 * @see android.content.Context#getSystemService(Class) 45 * @see android.content.Context#createWindowContext(int, android.os.Bundle) 46 * @see DisplayContext 47 * @hide 48 */ 49 @Retention(SOURCE) 50 @Target({TYPE, METHOD, PARAMETER, FIELD}) 51 public @interface UiContext { 52 } 53