Upgrade to AGP 4.2 and use the new transform API

Author: Chao Zhang

build.gradle

@@ -1,19 +1,13 @@
 plugins {
-    id 'org.jetbrains.kotlin.jvm' version '1.4.31'
-    id 'org.jetbrains.dokka' version '1.4.30'
+    id 'org.jetbrains.kotlin.jvm' version '1.4.32'
+    id 'org.jetbrains.dokka' version '1.4.32'
     id 'java-gradle-plugin'
     id 'com.vanniktech.maven.publish' version '0.14.2'
 }
 
 repositories {
     google()
     mavenCentral()
-    jcenter {
-        content {
-            includeGroup "org.jetbrains.trove4j"
-            includeGroup "org.jetbrains.kotlinx"
-        }
-    }
 }
 
 
@@ -35,16 +29,8 @@ compileJava {
 }
 
 dependencies {
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.4.31"
-    constraints {
-        implementation("org.jetbrains.kotlin:kotlin-reflect:1.4.31") {
-            because("Android Gradle Plugin 4.1 depends on Kotlin 1.3.72 but we should not mix 1.3 and 1.4.")
-        }
-        implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.4.31") {
-            because("Android Gradle Plugin 4.1 depends on Kotlin 1.3.72 but we should not mix 1.3 and 1.4.")
-        }
-    }
-    implementation 'com.android.tools.build:gradle-api:4.1.3'
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.4.32"
+    implementation 'com.android.tools.build:gradle-api:4.2.1'
     implementation 'org.ow2.asm:asm:9.1'
-    compileOnly 'com.android.tools.build:gradle:4.1.3'
+    compileOnly 'com.android.tools.build:gradle:4.2.1'
 }

gradle.properties

@@ -2,7 +2,7 @@ kotlin.code.style=official
 
 GROUP=io.github.chao2zhang.livedatadebugger
 POM_ARTIFACT_ID=livedatadebugger
-VERSION_NAME=0.0.3
+VERSION_NAME=0.1.0
 
 POM_NAME=LiveDataDebugger
 POM_DESCRIPTION=The gradle plugin to make LiveData universally debuggable

src/main/kotlin/io/github/chao2zhang/LiveDataClassVisitorFactory.kt

@@ -0,0 +1,14 @@
+package io.github.chao2zhang
+
+import com.android.build.api.instrumentation.*
+import org.objectweb.asm.ClassVisitor
+
+@Suppress("UnstableApiUsage")
+abstract class LiveDataClassVisitorFactory : AsmClassVisitorFactory<InstrumentationParameters> {
+
+    override fun createClassVisitor(classContext: ClassContext, nextClassVisitor: ClassVisitor) =
+        LiveDataClassVisitor(nextClassVisitor)
+
+    override fun isInstrumentable(classData: ClassData) =
+        classData.className == "androidx.lifecycle.LiveData"
+}

src/main/kotlin/io/github/chao2zhang/LiveDataDebuggerPlugin.kt

@@ -1,5 +1,8 @@
 package io.github.chao2zhang
 
+import com.android.build.api.extension.AndroidComponentsExtension
+import com.android.build.api.instrumentation.FramesComputationMode
+import com.android.build.api.instrumentation.InstrumentationScope
 import com.android.build.gradle.AppExtension
 import com.android.build.gradle.AppPlugin
 import org.gradle.api.Plugin
@@ -8,10 +11,14 @@ import org.gradle.api.Project
 class LiveDataDebuggerPlugin : Plugin<Project> {
 
     override fun apply(project: Project) {
-        project.plugins.withType(AppPlugin::class.java) { plugin ->
-            project.extensions.configure(AppExtension::class.java) { appExtension ->
-                appExtension.registerTransform(LiveDataTransform(project.logger))
-            }
+        val androidComponents = project.extensions.getByType(AndroidComponentsExtension::class.java)
+        androidComponents.onVariants {
+            it.transformClassesWith(
+                classVisitorFactoryImplClass = LiveDataClassVisitorFactory::class.java,
+                scope = InstrumentationScope.ALL,
+                instrumentationParamsConfig = { }
+            )
+            it.setAsmFramesComputationMode(FramesComputationMode.COMPUTE_FRAMES_FOR_INSTRUMENTED_METHODS)
         }
     }
 }