ConstLayntLayout内でmatchParentを使用した場合に警告するカスタムLintを作成する

package com.example.lint.checks.detector

import com.android.SdkConstants.*
import com.android.resources.ResourceFolderType
import com.android.tools.lint.detector.api.*
import com.android.utils.forEach
import org.w3c.dom.Element
import org.w3c.dom.Node

class ConstraintLayoutDetector : LayoutDetector() {

    // layoutファイルだけ検出するように設定
    override fun appliesTo(folderType: ResourceFolderType) =
        (folderType == ResourceFolderType.LAYOUT)

    // ConstraintLayoutの要素だけ検出するように設定
    override fun getApplicableElements() = setOf(
        CONSTRAINT_LAYOUT.oldName(),
        CONSTRAINT_LAYOUT.newName()
    )

    // 検出したConstraintLayoutに対してLintCheckを実行
    override fun visitElement(context: XmlContext, element: Element) {
        var child = element.firstChild
        while (child != null) {
            if (child.nodeType != Node.ELEMENT_NODE) {
                child = child.nextSibling
                continue
            }
            // ConstraintLayout内の子Viewの設定をチェックしていく
            child.attributes.forEach { attribute ->
                val name = attribute.localName ?: return@forEach
                val value = attribute.nodeValue
                // android:layout_width or android:layout_heightにmatch_parentが含まれているかチェック
                if (name != ATTR_LAYOUT_WIDTH && name != ATTR_LAYOUT_HEIGHT) return@forEach
                if (value != VALUE_MATCH_PARENT) return@forEach
                // Lintチェックに引っかかったのでreportする
                context.report(
                    issue = ISSUE_USE_MATCH_PARENT_IN_CONSTRAINT_LAYOUT,
                    location = context.getLocation(element),
                    message = ISSUE_USE_MATCH_PARENT_IN_CONSTRAINT_LAYOUT.getExplanation(TextFormat.TEXT)
                )
                return
            }
            child = child.nextSibling
        }
    }

    companion object {
        // Lintで検知した際に表示する内容などを設定する
        @JvmStatic
        internal val ISSUE_USE_MATCH_PARENT_IN_CONSTRAINT_LAYOUT = Issue.create(
            id = "UseMatchParentInConstraintLayout",
            briefDescription = "Similar behavior can be defined by using MATCH_CONSTRAINT with the corresponding left/right or top/bottom constraints being set to \"parent\"",
            explanation = "MATCH_PARENT is not recommended for widgets contained in a ConstraintLayout.",
            category = Category.CORRECTNESS,
            priority = 6,
            severity = Severity.ERROR,
            implementation = Implementation(
                ConstraintLayoutDetector::class.java,
                Scope.RESOURCE_FILE_SCOPE
            ),
            androidSpecific = true
        ).addMoreInfo("https://developer.android.com/reference/androidx/constraintlayout/widget/ConstraintLayout")
    }
}

package com.example.lint.checks

import com.android.tools.lint.checks.infrastructure.TestFiles.xml
import com.android.tools.lint.checks.infrastructure.TestLintTask.lint
import com.example.lint.checks.detector.ConstraintLayoutDetector
import org.junit.Test

@Suppress("UnstableApiUsage")
class XmlDetectorTest {
    @Test
    fun testXML() {
        lint()
            .files(
                xml(
                    "res/layout/sample.xml",
                    """
                <?xml version="1.0" encoding="utf-8"?>
                <layout xmlns:android="http://schemas.android.com/apk/res/android"
                    xmlns:app="http://schemas.android.com/apk/res-auto"
                    xmlns:tools="http://schemas.android.com/tools">

                    <data>

                    </data>

                    <androidx.constraintlayout.widget.ConstraintLayout
                        android:id="@+id/main"
                        android:layout_width="match_parent"
                        android:layout_height="match_parent"
                        tools:context=".ui.main.MainFragment">

                        <EditText
                            android:id="@+id/message_1"
                            android:layout_width="wrap_content"
                            android:layout_height="match_parent"
                            android:text="MainFragment"
                            app:layout_constraintBottom_toBottomOf="parent"
                            app:layout_constraintEnd_toEndOf="parent"
                            app:layout_constraintStart_toStartOf="parent"
                            app:layout_constraintTop_toTopOf="parent" />

                        <EditText
                            android:id="@+id/message_2"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:text="MainFragment"
                            app:layout_constraintBottom_toBottomOf="parent"
                            app:layout_constraintEnd_toEndOf="parent"
                            app:layout_constraintStart_toStartOf="parent"
                            app:layout_constraintTop_toTopOf="parent" />

                    </androidx.constraintlayout.widget.ConstraintLayout>
                </layout>
            """.trimIndent()
                ).indented()
            )
            .issues(ConstraintLayoutDetector.ISSUE_USE_MATCH_PARENT_IN_CONSTRAINT_LAYOUT)
            .allowMissingSdk()
            .run()
            .expectErrorCount(1)
    }
}