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 java.lang.annotation.Retention;
19 import java.lang.annotation.Target;
20 
21 import static java.lang.annotation.ElementType.CONSTRUCTOR;
22 import static java.lang.annotation.ElementType.METHOD;
23 import static java.lang.annotation.ElementType.TYPE;
24 import static java.lang.annotation.RetentionPolicy.SOURCE;
25 
26 /**
27  * Denotes that the annotated method or constructor should only be called on the UI thread.
28  * If the annotated element is a class, then all methods in the class should be called
29  * on the UI thread.
30  * <p>
31  * Example:
32  * <pre>{@code
33  *  &#64;UiThread
34  *  public abstract void setText(&#64;NonNull String text) { ... }
35  * }</pre>
36  *
37  * {@hide}
38  */
39 @Retention(SOURCE)
40 @Target({METHOD,CONSTRUCTOR,TYPE})
41 public @interface UiThread {
42 }