1 /* 2 * Copyright (C) 2014 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 package android.support.annotation; 17 18 import java.lang.annotation.Retention; 19 import java.lang.annotation.Target; 20 21 import static java.lang.annotation.ElementType.ANNOTATION_TYPE; 22 import static java.lang.annotation.ElementType.FIELD; 23 import static java.lang.annotation.ElementType.METHOD; 24 import static java.lang.annotation.ElementType.PARAMETER; 25 import static java.lang.annotation.RetentionPolicy.SOURCE; 26 27 /** 28 * Denotes that the annotated String element, represents a logical 29 * type and that its value should be one of the explicitly named constants. 30 * <p> 31 * Example: 32 * <pre><code> 33 * @Retention(SOURCE) 34 * @StringDef({ 35 * POWER_SERVICE, 36 * WINDOW_SERVICE, 37 * LAYOUT_INFLATER_SERVICE 38 * }) 39 * public @interface ServiceName {} 40 * public static final String POWER_SERVICE = "power"; 41 * public static final String WINDOW_SERVICE = "window"; 42 * public static final String LAYOUT_INFLATER_SERVICE = "layout_inflater"; 43 * ... 44 * public abstract Object getSystemService(@ServiceName String name); 45 * </code></pre> 46 */ 47 @Retention(SOURCE) 48 @Target({ANNOTATION_TYPE}) 49 public @interface StringDef { 50 /** Defines the allowed constants for this element */ value()51 String[] value() default {}; 52 } 53