1 /* 2 * Copyright (C) 2018 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.annotation; 17 18 import static java.lang.annotation.ElementType.CONSTRUCTOR; 19 import static java.lang.annotation.ElementType.FIELD; 20 import static java.lang.annotation.ElementType.METHOD; 21 import static java.lang.annotation.ElementType.TYPE; 22 import static java.lang.annotation.RetentionPolicy.SOURCE; 23 24 import java.lang.annotation.Retention; 25 import java.lang.annotation.Target; 26 27 /** 28 * Denotes that the annotated element requires one or more device features. This 29 * is used to auto-generate documentation. 30 * 31 * @hide 32 */ 33 @Retention(SOURCE) 34 @Target({TYPE,FIELD,METHOD,CONSTRUCTOR}) 35 public @interface RequiresFeature { 36 /** 37 * The name of the device feature that is required. 38 */ value()39 String value(); 40 41 /** 42 * Defines the name of the method that should be called to check whether the feature is 43 * available, using the same signature format as javadoc. The feature checking method can have 44 * multiple parameters, but the feature name parameter must be of type String and must also be 45 * the first String-type parameter. 46 * <p> 47 * By default, the enforcement is 48 * {@link android.content.pm.PackageManager#hasSystemFeature(String)}. 49 */ enforcement()50 String enforcement() default("android.content.pm.PackageManager#hasSystemFeature"); 51 } 52