# DelegateLastClassLoader Added in[API level 27](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) # DelegateLastClassLoader ``` class DelegateLastClassLoader : PathClassLoader ``` |---|---|---|---|--------------------------------------------------------------------------------------------------------------------------------| | [kotlin.Any](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html) ||||| | ↳ | [java.lang.ClassLoader](https://developer.android.com/reference/kotlin/java/lang/ClassLoader.html#) |||| | | ↳ | [dalvik.system.BaseDexClassLoader](https://developer.android.com/reference/kotlin/dalvik/system/BaseDexClassLoader) ||| | | | ↳ | [dalvik.system.PathClassLoader](https://developer.android.com/reference/kotlin/dalvik/system/PathClassLoader) || | | | | ↳ | [dalvik.system.DelegateLastClassLoader](https://developer.android.com/reference/kotlin/dalvik/system/DelegateLastClassLoader#) | A`ClassLoader`implementation that implements a**delegate last**lookup policy. For every class or resource this loader is requested to load, the following lookup order is employed: - The boot classpath is always searched first - Then, the list of`dex`files associated with this classloaders's`dexPath`is searched. - Finally, this classloader will delegate to the specified`parent`.
## Summary | Public constructors || |--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---| | [DelegateLastClassLoader](https://developer.android.com/reference/kotlin/dalvik/system/DelegateLastClassLoader#DelegateLastClassLoader(kotlin.String,%20java.lang.ClassLoader))`(`dexPath:` `[String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!`, `parent:` `[ClassLoader](https://developer.android.com/reference/kotlin/java/lang/ClassLoader.html#)!`)` Equivalent to calling[DelegateLastClassLoader(java.lang.String,java.lang.String,java.lang.ClassLoader,boolean)](https://developer.android.com/reference/kotlin/dalvik/system/DelegateLastClassLoader#DelegateLastClassLoader(kotlin.String,%20kotlin.String,%20java.lang.ClassLoader,%20kotlin.Boolean))with`librarySearchPath = null, delegateResourceLoading = true`. | | [DelegateLastClassLoader](https://developer.android.com/reference/kotlin/dalvik/system/DelegateLastClassLoader#DelegateLastClassLoader(kotlin.String,%20kotlin.String,%20java.lang.ClassLoader))`(`dexPath:` `[String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!`, `librarySearchPath:` `[String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!`, `parent:` `[ClassLoader](https://developer.android.com/reference/kotlin/java/lang/ClassLoader.html#)!`)` Equivalent to calling[DelegateLastClassLoader(java.lang.String,java.lang.String,java.lang.ClassLoader,boolean)](https://developer.android.com/reference/kotlin/dalvik/system/DelegateLastClassLoader#DelegateLastClassLoader(kotlin.String,%20kotlin.String,%20java.lang.ClassLoader,%20kotlin.Boolean))with`delegateResourceLoading = true`. | | [DelegateLastClassLoader](https://developer.android.com/reference/kotlin/dalvik/system/DelegateLastClassLoader#DelegateLastClassLoader(kotlin.String,%20kotlin.String,%20java.lang.ClassLoader,%20kotlin.Boolean))`(`dexPath:` `[String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)`, `librarySearchPath:` `[String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)?`, `parent:` `[ClassLoader](https://developer.android.com/reference/kotlin/java/lang/ClassLoader.html#)?`, `delegateResourceLoading:` `[Boolean](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html)`)` Creates a`DelegateLastClassLoader`that operates on a given`dexPath`and a`librarySearchPath`. | | Public methods || |-------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [URL](https://developer.android.com/reference/kotlin/java/net/URL.html#)! | [getResource](https://developer.android.com/reference/kotlin/dalvik/system/DelegateLastClassLoader#getResource(kotlin.String))`(`name:` `[String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!`)`
| | [Enumeration](https://developer.android.com/reference/kotlin/java/util/Enumeration.html#)\<[URL](https://developer.android.com/reference/kotlin/java/net/URL.html#)!\>! | [getResources](https://developer.android.com/reference/kotlin/dalvik/system/DelegateLastClassLoader#getResources(kotlin.String))`(`name:` `[String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!`)`
| | Protected methods || |--------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [Class](https://developer.android.com/reference/kotlin/java/lang/Class.html#)\<\*\>! | [loadClass](https://developer.android.com/reference/kotlin/dalvik/system/DelegateLastClassLoader#loadClass(kotlin.String,%20kotlin.Boolean))`(`name:` `[String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!`, `resolve:` `[Boolean](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html)`)`
| ## Public constructors ### DelegateLastClassLoader Added in[API level 27](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` DelegateLastClassLoader(     dexPath: String!,     parent: ClassLoader!) ``` Equivalent to calling[DelegateLastClassLoader(java.lang.String,java.lang.String,java.lang.ClassLoader,boolean)](https://developer.android.com/reference/kotlin/dalvik/system/DelegateLastClassLoader#DelegateLastClassLoader(kotlin.String,%20kotlin.String,%20java.lang.ClassLoader,%20kotlin.Boolean))with`librarySearchPath = null, delegateResourceLoading = true`. ### DelegateLastClassLoader Added in[API level 27](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` DelegateLastClassLoader(     dexPath: String!,     librarySearchPath: String!,     parent: ClassLoader!) ``` Equivalent to calling[DelegateLastClassLoader(java.lang.String,java.lang.String,java.lang.ClassLoader,boolean)](https://developer.android.com/reference/kotlin/dalvik/system/DelegateLastClassLoader#DelegateLastClassLoader(kotlin.String,%20kotlin.String,%20java.lang.ClassLoader,%20kotlin.Boolean))with`delegateResourceLoading = true`. ### DelegateLastClassLoader Added in[API level 29](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` DelegateLastClassLoader(     dexPath: String,     librarySearchPath: String?,     parent: ClassLoader?,     delegateResourceLoading: Boolean) ``` Creates a`DelegateLastClassLoader`that operates on a given`dexPath`and a`librarySearchPath`. The`dexPath`should consist of one or more of the following, separated by`File.pathSeparator`, which is`":"`on Android. - JAR/ZIP/APK files, possibly containing a "classes.dex" file as well as arbitrary resources. - Raw ".dex" files (not inside a zip file). Unlike[PathClassLoader](https://developer.android.com/reference/kotlin/dalvik/system/PathClassLoader), this classloader will attempt to locate classes (or resources) using the following lookup order. - The boot classpath is always searched first. - Then, the list of`dex`files contained in`dexPath`is searched./li\> - Lastly, this classloader will delegate to the specified`parent`. Note that this is in contrast to other standard classloaders that follow the delegation model. In those classloaders, the`parent`is always searched first.`librarySearchPath`specifies one more directories containing native library files, separated by`File.pathSeparator`.
| Parameters || |---------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `dexPath` | [String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html):the list of jar/apk files containing classes and resources, delimited by`File.pathSeparator`, which defaults to`":"`on Android. This value cannot be`null`. | | `librarySearchPath` | [String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)?:the list of directories containing native libraries, delimited by`File.pathSeparator`; may be`null`. | | `parent` | [ClassLoader](https://developer.android.com/reference/kotlin/java/lang/ClassLoader.html#)?:the parent class loader. May be`null`for the boot classloader. | | `delegateResourceLoading` | [Boolean](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html):whether to delegate resource loading to the parent if the resource is not found. This does not affect class loading delegation. | ## Public methods ### getResource Added in[API level 27](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` fun getResource(name: String!): URL! ``` | Parameters || |--------|-----------------------------------------------------------------------------------------------------| | `name` | [String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!:The resource name | | Return || |---------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [URL](https://developer.android.com/reference/kotlin/java/net/URL.html#)! | `URL`object for reading the resource;`null`if the resource could not be found, a`URL`could not be constructed to locate the resource, the resource is in a package that is not opened unconditionally, or access to the resource is denied by the security manager. | | Exceptions || |----------------------------------|------------------| | `java.lang.NullPointerException` | If`name`is`null` | ### getResources Added in[API level 27](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` fun getResources(name: String!): Enumeration! ``` | Parameters || |--------|-----------------------------------------------------------------------------------------------------| | `name` | [String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!:The resource name | | Return || |-----------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [Enumeration](https://developer.android.com/reference/kotlin/java/util/Enumeration.html#)<[URL](https://developer.android.com/reference/kotlin/java/net/URL.html#)!>! | An enumeration of[URL](https://developer.android.com/reference/kotlin/java/net/URL.html#)objects for the resource. If no resources could be found, the enumeration will be empty. Resources for which a`URL`cannot be constructed, are in a package that is not opened unconditionally, or access to the resource is denied by the security manager, are not returned in the enumeration. | | Exceptions || |----------------------------------|---------------------| | `java.io.IOException` | If I/O errors occur | | `java.lang.NullPointerException` | If`name`is`null` | ## Protected methods ### loadClass Added in[API level 27](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` protected fun loadClass(     name: String!,     resolve: Boolean ): Class<*>! ``` | Parameters || |-----------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `name` | [String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!:The[binary name](https://developer.android.com/reference/kotlin/dalvik/system/DelegateLastClassLoader#binary-name)of the class | | `resolve` | [Boolean](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html):If`true`then resolve the class | | Return || |-----------------------------------------------------------------------------------|----------------------------| | [Class](https://developer.android.com/reference/kotlin/java/lang/Class.html#)<*>! | The resulting`Class`object | | Exceptions || |------------------------------------|---------------------------------| | `java.lang.ClassNotFoundException` | If the class could not be found |