Use built-in DelegateLastClassLoader for extensions (#3874)

Assisted-by: Claude:claude-opus-5
2026-08-29 22:07:51 +06:00
parent b695940114
commit 7f342ca076
3 changed files with 72 additions and 88 deletions
@@ -0,0 +1,70 @@
+package mihon.data.dalvik
+
+import android.os.Build
+import dalvik.system.DelegateLastClassLoader
+import dalvik.system.PathClassLoader
+import java.net.URL
+import java.util.Collections
+import java.util.Enumeration
+
+@Suppress("FunctionName")
+fun DelegateLastClassLoaderCompat(
+    dexPath: String,
+    librarySearchPath: String?,
+    parent: ClassLoader,
+): ClassLoader {
+    return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
+        DelegateLastClassLoader(dexPath, librarySearchPath, parent)
+    } else {
+        DelegateLastPathClassLoader(dexPath, librarySearchPath, parent)
+    }
+}
+
+/**
+ * Backport of [DelegateLastClassLoader], which was added in API 27.
+ */
+private class DelegateLastPathClassLoader(
+    dexPath: String,
+    librarySearchPath: String?,
+    parent: ClassLoader,
+) : PathClassLoader(dexPath, librarySearchPath, parent) {
+
+    private val bootClassLoader: ClassLoader? = Any::class.java.classLoader
+
+    override fun loadClass(name: String?, resolve: Boolean): Class<*> {
+        findLoadedClass(name)?.let { return it }
+
+        if (bootClassLoader != null) {
+            try {
+                return bootClassLoader.loadClass(name)
+            } catch (_: ClassNotFoundException) {}
+        }
+
+        val fromSuper = try {
+            return findClass(name)
+        } catch (e: ClassNotFoundException) {
+            e
+        }
+
+        return try {
+            parent.loadClass(name)
+        } catch (_: ClassNotFoundException) {
+            throw fromSuper
+        }
+    }
+
+    override fun getResource(name: String?): URL? {
+        return bootClassLoader?.getResource(name)
+            ?: findResource(name)
+            ?: parent?.getResource(name)
+    }
+
+    override fun getResources(name: String?): Enumeration<URL> {
+        val resources = buildList {
+            bootClassLoader?.getResources(name)?.let { addAll(it.toList()) }
+            findResources(name)?.let { addAll(it.toList()) }
+            parent?.getResources(name)?.let { addAll(it.toList()) }
+        }
+        return Collections.enumeration(resources)
+    }
+}