An annotation does nothing in and of itself, it only serves to annotate your code. Priority: Define priority of the issue on a scale of 0 to However, the heart of a Lint check lies elsewhere: in the Detector. Here are the available categories are: Priority - a number between one and ten describing how important this issue is.
If the test-resources directory setup above is correctly found, then the lintFiles call will load the test file into memory as an on-the-fly Android project hypothesis testing statistics explained then run a Lint check on it, returning its output as a String value.
This determines what types of files this issue applies to. Or at least this is how it should look like after Android Studio will fix the bug mention here :.
If a future developer cannot immediately understand which method is the source of the issue it may take them a long time to even find the JavaDoc which explains the problem. Category - The category of lint rule. You need to write more code to search for the annotations and perform some action.
Categories are useful because a user can filter and sort Issues, which allows for including or excluding Issues in a given Lint run on a per-category basis. The Scope is important, it tells lint what kinds of files your detector should look through, e.
If you have used Android Studio you should already be familiar with these inspections.
The Lint tool will always check there for anything new on each run. Rules with severity "ignore" are not run. Possibilities include but are not limited to resource files, Java source files, Java class files, Proguard configuration files, Android Manifest files and all files in the project. Now, the manifest i.
The source file I studied to write my lint rule was SupportAnnoationDetector. Issue: As the name suggests, this is what we are using lint for - to find issues in our code. Note that a detector is instantiated automatically on our behalf by lint. Creating an annotation in and of cheap paper storage is simple.
With a bit of searching, you can find the source code for all of the existing Android Lint checks. Fatal Issues are considered slightly more severe, as they will be checked automatically during APK assembling. Only one step left! A single Detector can search for multiple independent but related Issues, such as finding multiple Android Manifest Issues using a single Detector.
Instead of lines of code, you get a searchable tree.
Java source files, XML resource files, gradle build files etc. Writing a custom Lint rule Posted on by Yaakov Shahak Writing a custom Lint rule sounds like a complicated thing, but actually this is a very easy thing to do, and can benefit your cadebase a great deal. NotNull; import java. The most common categories are "correctness" and "performance", but also includes internationalization, accessibility, usability, etc.
For my first go I just wanted it to work, and it does!
Note that I said "default": users can override the severities used for an issue via a lint. An explanation.
The Detector The Detector is responsible for scanning through code, finding individual Issue instances and reporting them. Explanation - The explanation is a longer summary of the Issue, explaining in depth to the user what it means. Description - The description is a brief single-line summary of the Issue, used to give a high-level idea of what this Issue concerns.
Here is an explanation of the different parts of the class. Module In writing custom lint rules Android app project, create a new module and select Java Library option. This is a constant associated with the issue, which should be short and descriptive; this id is for example used in Java suppress annotations and XML suppress attributes writing custom lint rules identify this issue.
In our Enum-searching case, we set the Scope to be Scope. Now we can use it on any project. Once we have the String of the finished Lint check, we compare against what we expected.
This is where you define the metadata for your lint rule. Formal letters presentation, the principles and topics herein should remain useful to anyone attempting to build custom Lint checks.
While having the Lint check available on a system level is great, the final trial is actually running our shiny new Lint check on a real project, so navigate to an actual Android cheap paper storage project of your choice and run the following:. Arrays; import java.
In this post, cheap paper storage will go through an example of building a custom Lint check that identifies when an Enum is being used because some folks dislike Enums. A summary. ApiKt; import com. There are other versions of the report This is a reference to the issue being reported by this detector. We provide Scope.
Severity - The severity determines how bad the Issue is in a build and compilation sense, writing custom lint rules the possibilities being fatal, error, warning or ignore. A node could be a class declaration or a method invocation or even a comment. A custom lint rule!
This sample demonstrates how to create a custom lint checks and corresponding tests for those rules. The ID should never be null. If a specific method was called at the wrong time it would cause a StackOverflowError. If you don't specify one, the compiler will automatically create one for you, which is the case above.
To allow Lint to automatically instantiate your Detector, we provide a public default constructor. In the meanwhile you can use the same workaround mention in the tracker, and put the generated customlint. TEXT ; return super.