WebView optimization

booster-android-instrument-webview/build.gradle

+sourceCompatibility = JavaVersion.VERSION_1_7
+targetCompatibility = JavaVersion.VERSION_1_7
+
+dependencies {
+    compileOnly project(':booster-android-api')
+    compile project(':booster-android-instrument')
+}
\ No newline at end of file

booster-android-instrument-webview/src/main/java/com/didiglobal/booster/instrument/ShadowWebView.java

+package com.didiglobal.booster.instrument;
+
+import android.app.Application;
+import android.os.MessageQueue;
+import android.os.SystemClock;
+import android.util.Log;
+
+import static com.didiglobal.booster.android.bugfix.Constants.TAG;
+import static com.didiglobal.booster.android.bugfix.Reflection.invokeMethod;
+import static com.didiglobal.booster.android.bugfix.Reflection.invokeStaticMethod;
+
+/**
+ * @author neighbWang
+ */
+public class ShadowWebView {
+
+    public static void preloadWebView(final Application app) {
+        try {
+            app.getMainLooper().getQueue().addIdleHandler(new MessageQueue.IdleHandler() {
+                @Override
+                public boolean queueIdle() {
+                    startChromiumEngine();
+                    return false;
+                }
+            });
+        } catch (final Throwable t) {
+            Log.e(TAG, "Oops!", t);
+        }
+    }
+
+    private static void startChromiumEngine() {
+        try {
+            final long t0 = SystemClock.uptimeMillis();
+            final Object provider = invokeStaticMethod(Class.forName("android.webkit.WebViewFactory"), "getProvider");
+            invokeMethod(provider, "startYourEngines", new Class[]{boolean.class}, new Object[]{true});
+            Log.i(TAG, "Start chromium engine complete: " + (SystemClock.uptimeMillis() - t0) + " ms");
+        } catch (final Throwable t) {
+            Log.e(TAG, "Start chromium engine error", t);
+        }
+    }
+}
\ No newline at end of file

booster-transform-all/build.gradle

@@ -6,4 +6,5 @@ dependencies {
     compile project(':booster-transform-toast')
     compile project(':booster-transform-usage')
     compile project(':booster-transform-media-player')
+    compile project(':booster-transform-webview')
 }

booster-transform-webview/build.gradle

+apply from: '../gradle/booster.gradle'
+
+dependencies {
+    kapt "com.google.auto.service:auto-service:1.0-rc4"
+    implementation project(':booster-android-gradle-api')
+    implementation project(':booster-task-spi')
+    implementation project(':booster-transform-asm')
+    compileOnly 'com.android.tools.build:gradle:3.0.0'
+    testCompileOnly 'com.android.tools.build:gradle:3.0.0'
+}

booster-transform-webview/src/main/kotlin/com/didiglobal/booster/transform/webview/WebViewTransformer.kt

+package com.didiglobal.booster.transform.webview
+
+import com.didiglobal.booster.kotlinx.file
+import com.didiglobal.booster.kotlinx.touch
+import com.didiglobal.booster.transform.ArtifactManager
+import com.didiglobal.booster.transform.TransformContext
+import com.didiglobal.booster.transform.asm.ClassTransformer
+import com.didiglobal.booster.transform.asm.className
+import com.didiglobal.booster.transform.asm.findAll
+import com.didiglobal.booster.util.ComponentHandler
+import com.google.auto.service.AutoService
+import org.objectweb.asm.Opcodes.ACC_PUBLIC
+import org.objectweb.asm.Opcodes.ALOAD
+import org.objectweb.asm.Opcodes.ATHROW
+import org.objectweb.asm.Opcodes.INVOKESPECIAL
+import org.objectweb.asm.Opcodes.INVOKESTATIC
+import org.objectweb.asm.Opcodes.RETURN
+import org.objectweb.asm.tree.ClassNode
+import org.objectweb.asm.tree.InsnList
+import org.objectweb.asm.tree.InsnNode
+import org.objectweb.asm.tree.MethodInsnNode
+import org.objectweb.asm.tree.MethodNode
+import org.objectweb.asm.tree.VarInsnNode
+import java.io.PrintWriter
+import javax.xml.parsers.SAXParserFactory
+
+/**
+ * Represents a class transformer for application optimization
+ *
+ * @author neighbWang
+ */
+@AutoService(ClassTransformer::class)
+class WebViewTransformer : ClassTransformer {
+
+    private lateinit var logger: PrintWriter
+    private val applications = mutableSetOf<String>()
+
+    override fun onPreTransform(context: TransformContext) {
+        val parser = SAXParserFactory.newInstance().newSAXParser()
+        context.artifacts.get(ArtifactManager.MERGED_MANIFESTS).forEach { manifest ->
+            val handler = ComponentHandler()
+            parser.parse(manifest, handler)
+            applications.addAll(handler.applications)
+        }
+
+        this.logger = context.reportsDir.file(Build.ARTIFACT).file(context.name).file("report.txt").touch().printWriter()
+    }
+
+    override fun onPostTransform(context: TransformContext) {
+        this.logger.close()
+    }
+
+    override fun transform(context: TransformContext, klass: ClassNode): ClassNode {
+        if (!this.applications.contains(klass.className)) {
+            return klass
+        }
+
+        val method = klass.methods?.find {
+            "${it.name}${it.desc}" == "onCreate()V"
+        } ?: klass.defaultOnCreate()
+
+        method.instructions?.let { insn ->
+            insn.findAll(RETURN, ATHROW).forEach { ret ->
+                insn.insertBefore(ret, VarInsnNode(ALOAD, 0))
+                insn.insertBefore(ret, MethodInsnNode(INVOKESTATIC, SHADOW_WEBVIEW, "preloadWebView", "(Landroid/app/Application;)V", false))
+                logger.println(" + $SHADOW_WEBVIEW.preloadWebView(Landroid/app/Application;)V before @${if (ret.opcode == ATHROW) "athrow" else "return"}: ${klass.name}.${method.name}${method.desc} ")
+            }
+        }
+        return klass
+    }
+}
+
+private fun ClassNode.defaultOnCreate(): MethodNode = MethodNode(ACC_PUBLIC, "onCreate", "()V", null, null).apply {
+    maxStack = 1
+    instructions.add(InsnList().apply {
+        add(VarInsnNode(ALOAD, 0))
+        add(MethodInsnNode(INVOKESPECIAL, superName, name, desc, false))
+        add(InsnNode(RETURN))
+    })
+    methods?.add(this)
+}
+
+private const val SHADOW_WEBVIEW = "com/didiglobal/booster/instrument/ShadowWebView"
\ No newline at end of file

booster-transform-webview/src/main/kotlin/com/didiglobal/booster/transform/webview/WebViewVariantProcessor.kt

+package com.didiglobal.booster.transform.webview
+
+import com.android.build.gradle.api.BaseVariant
+import com.didiglobal.booster.gradle.scope
+import com.didiglobal.booster.task.spi.VariantProcessor
+import com.google.auto.service.AutoService
+
+/**
+ * @author neighbWang
+ */
+@AutoService(VariantProcessor::class)
+class WebViewVariantProcessor : VariantProcessor {
+
+    override fun process(variant: BaseVariant) {
+        variant.scope.globalScope.project.dependencies.add(
+            "implementation",
+            "${Build.GROUP}:booster-android-instrument-webview:${Build.VERSION}"
+        )
+    }
+}
\ No newline at end of file

settings.gradle

@@ -5,6 +5,7 @@ include ':booster-android-instrument-media-player'
 include ':booster-android-instrument-shared-preferences'
 include ':booster-android-instrument-thread'
 include ':booster-android-instrument-toast'
+include ':booster-android-instrument-webview'
 include ':booster-android-gradle-api'
 include ':booster-android-gradle-v3_0'
 include ':booster-android-gradle-v3_2'
@@ -28,4 +29,5 @@ include ':booster-transform-toast'
 include ':booster-transform-usage'
 include ':booster-transform-util'
 include ':booster-kotlinx'
+include ':booster-transform-webview'