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 package android.annotation; 17 18 import static java.lang.annotation.ElementType.CONSTRUCTOR; 19 import static java.lang.annotation.ElementType.METHOD; 20 import static java.lang.annotation.ElementType.PARAMETER; 21 import static java.lang.annotation.ElementType.TYPE; 22 import static java.lang.annotation.RetentionPolicy.SOURCE; 23 24 import android.os.Looper; 25 26 import java.lang.annotation.Retention; 27 import java.lang.annotation.Target; 28 29 /** 30 * Denotes that the annotated method or constructor should only be called on the 31 * UI thread. If the annotated element is a class, then all methods in the class 32 * should be called on the UI thread. 33 * <p> 34 * Example: 35 * 36 * <pre> 37 * <code> 38 * @UiThread 39 * public abstract void setText(@NonNull String text) { ... } 40 * </code> 41 * </pre> 42 * 43 * @memberDoc This method must be called on the thread that originally created 44 * this UI element. This is typically the 45 * {@linkplain Looper#getMainLooper() main thread} of your app. 46 * @hide 47 */ 48 @Retention(SOURCE) 49 @Target({METHOD,CONSTRUCTOR,TYPE,PARAMETER}) 50 public @interface UiThread { 51 } 52
