When using the annotation-experimental artifact as a dependency, the Lint rules provided by the annotation-experimental-lint artifact will be enforced automatically.
The commits included in this version can be found here. The full list of commits included in this version can be found here. Content and code samples on this page are subject to the licenses described in the Content License. Explore the libraries Library Releases. Release Notes. If your parameter is a float or double, and must be in a certain range, you can use the FloatRange annotation:. If somebody is under the impression that your API takes a value from 0 - and tries to call setAlpha , the tools will catch this:.
Similarly, if your parameter is an int or long, you can use the IntRange annotation to constrain the value to a particular integer range:. This annotation is most useful when applied to parameters where users are likely to get the range wrong, such as the example above where some APIs take alpha to be a value from and others a float from Finally, for arrays, collections and Strings, you can use the Size parameter to specify constraints on the size of the collection or in the case of Strings, the length of the strings.
If your method call requires the caller to hold precisely one permission, you can use the RequiresPermission annotation like this:. RequiresPermission Manifest. For permissions on intents, place the permission requirement on the String field which defines the intent constant these normally are already annotated with SdkConstant :. RequiresPermission android. For permissions on content providers, you probably need separate permissions for read and write access, so wrap each permission requirement in a Read or Write annotation:.
If your API allows callers to override a method, but you need your own method to be invoked from any overriding methods as well, you can annotate the method with CallSuper:. With this, the tools will immediately flag overriding code that fails to invoke the super method:. That bug has been fixed in Preview 2, now available in the canary channel. If your method is returning a value that callers are expected to do something with, annotate the method with CheckResult. For example, many new Java developers are confused by String.
If that method is annotated with CheckResult, the tools will flag uses of String. This is important because some developers were calling context.
Anyone calling that method without looking at the return value probably intended to call Context enforcePermission instead. This annotation lets you declare that a class, method or field is more visible than necessary, in order to be able to access it from tests.
We've also added Keep to the support annotations. You can use this annotation to indicate that a given class or method should not be removed when shrinking the application with ProGuard. Any classes or methods or fields annotated with Keep will automatically be kept. Note that you need to use Gradle plugin version 2. If you annotate your own libraries with these annotations, and use Gradle to build an AAR artifact, at build time the Android Gradle plugin will extract annotation information and ship it inside your AAR file for use by clients of your library.
You can take a look at the annotations. This is necessary because. The Android Gradle plugin will run the extract annotations task as part of the build if and only if your project depends on the annotations support library. Note that only the source-retention annotations are placed in the. Viewed 7k times. The following line shows error stating 'Cannot find symbol annotation' import android. NonNull; Where do I download the android-support-annotations jar that contains this annotation?
I'm new to Android studio, can you please list the steps to include the same? Is it some external jar I need to download? Why do you need jar in case you are using android studio you can just add this line compile 'com. This will do everything under the hood. Add a comment. Active Oldest Votes. Open annotation folder Your required jar is in annotation folder.
MonoAndroid 8. MonoAndroid 9. Annotations: Package Downloads Xamarin. Compat Xamarin. Android bindings for Android Support Library - support-compat Utils Xamarin. Android bindings for Android Support Library - support-core-utils UI Xamarin. Android bindings for Android Support Library - support-core-ui AppCompat Xamarin. Android bindings for Android Support Library - appcompat-v7
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