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 is tied to a {@link android.view.Display} and can 30 * be used to obtain one via {@link android.content.Context#getDisplay}, but <b>may not</b> be able 31 * to obtain {@link android.view.WindowManager}, {@link android.view.LayoutInflater} or 32 * {@link android.app.WallpaperManager} via 33 * {@link android.content.Context#getSystemService(String)}. If the UI services mentioned above are 34 * required, please use contexts which are marked as {@link UiContext}. 35 * <p> 36 * {@link android.app.Activity}, and the result of 37 * {@link android.content.Context#createWindowContext(int, android.os.Bundle)} or 38 * {@link android.content.Context#createDisplayContext(android.view.Display)} can be used where a 39 * {@link DisplayContext} is required. 40 * <p> 41 * This is a marker annotation and has no specific attributes. 42 * 43 * @see android.content.Context#getDisplay() 44 * @see android.content.Context#getSystemService(String) 45 * @see android.content.Context#getSystemService(Class) 46 * @see android.content.Context#createDisplayContext(Display) 47 * @see android.content.Context#createWindowContext(int, Bundle) 48 * @see UiContext 49 * @hide 50 */ 51 @Retention(SOURCE) 52 @Target({TYPE, METHOD, PARAMETER, FIELD}) 53 public @interface DisplayContext { 54 } 55