Added in [API level 14](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels) Summary: [Ctors](https://developer.android.com/reference/dalvik/system/BaseDexClassLoader#pubctors) \| [Methods](https://developer.android.com/reference/dalvik/system/BaseDexClassLoader#pubmethods) \| [Protected Methods](https://developer.android.com/reference/dalvik/system/BaseDexClassLoader#promethods) \| [Inherited Methods](https://developer.android.com/reference/dalvik/system/BaseDexClassLoader#inhmethods)

# BaseDexClassLoader

` public class BaseDexClassLoader `   
` ` ` extends https://developer.android.com/reference/java/lang/ClassLoader ` ` `

|---|---|---|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object) |||
| ↳ | [java.lang.ClassLoader](https://developer.android.com/reference/java/lang/ClassLoader) ||
|   | ↳ | dalvik.system.BaseDexClassLoader |

Known direct subclasses [DexClassLoader](https://developer.android.com/reference/dalvik/system/DexClassLoader), [InMemoryDexClassLoader](https://developer.android.com/reference/dalvik/system/InMemoryDexClassLoader), [PathClassLoader](https://developer.android.com/reference/dalvik/system/PathClassLoader) [DexClassLoader](https://developer.android.com/reference/dalvik/system/DexClassLoader) A class loader that loads classes from `.jar` and `.apk` files containing a `classes.dex` entry. [InMemoryDexClassLoader](https://developer.android.com/reference/dalvik/system/InMemoryDexClassLoader) A `https://developer.android.com/reference/java/lang/ClassLoader` implementation that loads classes from a buffer containing a DEX file. [PathClassLoader](https://developer.android.com/reference/dalvik/system/PathClassLoader) Provides a simple `https://developer.android.com/reference/java/lang/ClassLoader` implementation that operates on a list of files and directories in the local file system, but does not attempt to load classes from the network. Known indirect subclasses [DelegateLastClassLoader](https://developer.android.com/reference/dalvik/system/DelegateLastClassLoader) [DelegateLastClassLoader](https://developer.android.com/reference/dalvik/system/DelegateLastClassLoader) A `ClassLoader` implementation that implements a **delegate last** lookup policy.   

*** ** * ** ***

Base class for common functionality between various dex-based `https://developer.android.com/reference/java/lang/ClassLoader` implementations.

## Summary

| ### Public constructors ||
|---|---|
| ` https://developer.android.com/reference/dalvik/system/BaseDexClassLoader#BaseDexClassLoader(java.lang.String,%20java.io.File,%20java.lang.String,%20java.lang.ClassLoader)(https://developer.android.com/reference/java/lang/String dexPath, https://developer.android.com/reference/java/io/File optimizedDirectory, https://developer.android.com/reference/java/lang/String librarySearchPath, https://developer.android.com/reference/java/lang/ClassLoader parent) ` Constructs an instance. |

| ### Public methods ||
|---|---|
| ` https://developer.android.com/reference/java/lang/String` | ` https://developer.android.com/reference/dalvik/system/BaseDexClassLoader#findLibrary(java.lang.String)(https://developer.android.com/reference/java/lang/String name) ` Returns the absolute path name of a native library. |
| ` https://developer.android.com/reference/java/lang/String` | ` https://developer.android.com/reference/dalvik/system/BaseDexClassLoader#toString()() ` Returns a string representation of the object. |

| ### Protected methods ||
|---|---|
| ` https://developer.android.com/reference/java/lang/Class<?>` | ` https://developer.android.com/reference/dalvik/system/BaseDexClassLoader#findClass(java.lang.String)(https://developer.android.com/reference/java/lang/String name) ` Finds the class with the specified [binary name](https://developer.android.com/reference/dalvik/system/BaseDexClassLoader#binary-name). |
| ` https://developer.android.com/reference/java/net/URL` | ` https://developer.android.com/reference/dalvik/system/BaseDexClassLoader#findResource(java.lang.String)(https://developer.android.com/reference/java/lang/String name) ` Finds the resource with the given name. |
| ` https://developer.android.com/reference/java/util/Enumeration<https://developer.android.com/reference/java/net/URL>` | ` https://developer.android.com/reference/dalvik/system/BaseDexClassLoader#findResources(java.lang.String)(https://developer.android.com/reference/java/lang/String name) ` Returns an enumeration of `https://developer.android.com/reference/java/net/URL` objects representing all the resources with the given name. |
| ` https://developer.android.com/reference/java/lang/Package` | ` https://developer.android.com/reference/dalvik/system/BaseDexClassLoader#getPackage(java.lang.String)(https://developer.android.com/reference/java/lang/String name) ` *This method is deprecated. See `https://developer.android.com/reference/java/lang/ClassLoader#getPackage(java.lang.String)`* |

### Inherited methods

From class ` https://developer.android.com/reference/java/lang/ClassLoader ` ` void` ` https://developer.android.com/reference/java/lang/ClassLoader#clearAssertionStatus()() `

Sets the default assertion status for this class loader to `false` and discards any package defaults or class assertion status settings associated with the class loader.
` final https://developer.android.com/reference/java/lang/Class<?>` ` https://developer.android.com/reference/java/lang/ClassLoader#defineClass(java.lang.String,%20byte[],%20int,%20int,%20java.security.ProtectionDomain)(https://developer.android.com/reference/java/lang/String name, byte[] b, int off, int len, https://developer.android.com/reference/java/security/ProtectionDomain protectionDomain) `

Converts an array of bytes into an instance of class `Class`, with a given `ProtectionDomain`.
` final https://developer.android.com/reference/java/lang/Class<?>` ` https://developer.android.com/reference/java/lang/ClassLoader#defineClass(java.lang.String,%20java.nio.ByteBuffer,%20java.security.ProtectionDomain)(https://developer.android.com/reference/java/lang/String name, https://developer.android.com/reference/java/nio/ByteBuffer b, https://developer.android.com/reference/java/security/ProtectionDomain protectionDomain) `

Converts a `https://developer.android.com/reference/java/nio/ByteBuffer` into an instance of class `Class`, with the given `ProtectionDomain`.
` final https://developer.android.com/reference/java/lang/Class<?>` ` https://developer.android.com/reference/java/lang/ClassLoader#defineClass(byte[],%20int,%20int)(byte[] b, int off, int len) `

*This method was deprecated in API level 15. Replaced by `https://developer.android.com/reference/java/lang/ClassLoader#defineClass(java.lang.String,%20byte[],%20int,%20int)`*
` final https://developer.android.com/reference/java/lang/Class<?>` ` https://developer.android.com/reference/java/lang/ClassLoader#defineClass(java.lang.String,%20byte[],%20int,%20int)(https://developer.android.com/reference/java/lang/String name, byte[] b, int off, int len) `

Converts an array of bytes into an instance of class `Class`.
` https://developer.android.com/reference/java/lang/Package` ` https://developer.android.com/reference/java/lang/ClassLoader#definePackage(java.lang.String,%20java.lang.String,%20java.lang.String,%20java.lang.String,%20java.lang.String,%20java.lang.String,%20java.lang.String,%20java.net.URL)(https://developer.android.com/reference/java/lang/String name, https://developer.android.com/reference/java/lang/String specTitle, https://developer.android.com/reference/java/lang/String specVersion, https://developer.android.com/reference/java/lang/String specVendor, https://developer.android.com/reference/java/lang/String implTitle, https://developer.android.com/reference/java/lang/String implVersion, https://developer.android.com/reference/java/lang/String implVendor, https://developer.android.com/reference/java/net/URL sealBase) `

Defines a package by [name](https://developer.android.com/reference/dalvik/system/BaseDexClassLoader#binary-name) in this `ClassLoader`.
` https://developer.android.com/reference/java/lang/Class<?>` ` https://developer.android.com/reference/java/lang/ClassLoader#findClass(java.lang.String)(https://developer.android.com/reference/java/lang/String name) `

Finds the class with the specified [binary name](https://developer.android.com/reference/dalvik/system/BaseDexClassLoader#binary-name).
` https://developer.android.com/reference/java/lang/String` ` https://developer.android.com/reference/java/lang/ClassLoader#findLibrary(java.lang.String)(https://developer.android.com/reference/java/lang/String libname) `

Returns the absolute path name of a native library.
` final https://developer.android.com/reference/java/lang/Class<?>` ` https://developer.android.com/reference/java/lang/ClassLoader#findLoadedClass(java.lang.String)(https://developer.android.com/reference/java/lang/String name) `

Returns the class with the given [binary name](https://developer.android.com/reference/dalvik/system/BaseDexClassLoader#binary-name) if this loader has been recorded by the Java virtual machine as an initiating loader of a class with that [binary name](https://developer.android.com/reference/dalvik/system/BaseDexClassLoader#binary-name).
` https://developer.android.com/reference/java/net/URL` ` https://developer.android.com/reference/java/lang/ClassLoader#findResource(java.lang.String)(https://developer.android.com/reference/java/lang/String name) `

Finds the resource with the given name.
` https://developer.android.com/reference/java/util/Enumeration<https://developer.android.com/reference/java/net/URL>` ` https://developer.android.com/reference/java/lang/ClassLoader#findResources(java.lang.String)(https://developer.android.com/reference/java/lang/String name) `

Returns an enumeration of `https://developer.android.com/reference/java/net/URL` objects representing all the resources with the given name.
` final https://developer.android.com/reference/java/lang/Class<?>` ` https://developer.android.com/reference/java/lang/ClassLoader#findSystemClass(java.lang.String)(https://developer.android.com/reference/java/lang/String name) `

Finds a class with the specified [binary name](https://developer.android.com/reference/dalvik/system/BaseDexClassLoader#binary-name), loading it if necessary.
` https://developer.android.com/reference/java/lang/Package` ` https://developer.android.com/reference/java/lang/ClassLoader#getPackage(java.lang.String)(https://developer.android.com/reference/java/lang/String name) `

*This method was deprecated in API level 35. If multiple class loaders delegate to each other and define classes with the same package name, and one such loader relies on the lookup behavior of `getPackage` to return a `Package` from a parent loader, then the properties exposed by the `Package` may not be as expected in the rest of the program. For example, the `Package` will only expose annotations from the `package-info.class` file defined by the parent loader, even if annotations exist in a `package-info.class` file defined by a child loader.*
` https://developer.android.com/reference/java/lang/Package` ` https://developer.android.com/reference/java/lang/ClassLoader#getPackages()() `

Returns all of the `Package`s that have been defined by this class loader and its ancestors.
` final https://developer.android.com/reference/java/lang/ClassLoader` ` https://developer.android.com/reference/java/lang/ClassLoader#getParent()() `

Returns the parent class loader for delegation.
` https://developer.android.com/reference/java/net/URL` ` https://developer.android.com/reference/java/lang/ClassLoader#getResource(java.lang.String)(https://developer.android.com/reference/java/lang/String name) `

Finds the resource with the given name.
` https://developer.android.com/reference/java/io/InputStream` ` https://developer.android.com/reference/java/lang/ClassLoader#getResourceAsStream(java.lang.String)(https://developer.android.com/reference/java/lang/String name) `

Returns an input stream for reading the specified resource.
` https://developer.android.com/reference/java/util/Enumeration<https://developer.android.com/reference/java/net/URL>` ` https://developer.android.com/reference/java/lang/ClassLoader#getResources(java.lang.String)(https://developer.android.com/reference/java/lang/String name) `

Finds all the resources with the given name.
` static https://developer.android.com/reference/java/lang/ClassLoader` ` https://developer.android.com/reference/java/lang/ClassLoader#getSystemClassLoader()() `

Returns the system class loader.
` static https://developer.android.com/reference/java/net/URL` ` https://developer.android.com/reference/java/lang/ClassLoader#getSystemResource(java.lang.String)(https://developer.android.com/reference/java/lang/String name) `

Find a resource of the specified name from the search path used to load classes.
` static https://developer.android.com/reference/java/io/InputStream` ` https://developer.android.com/reference/java/lang/ClassLoader#getSystemResourceAsStream(java.lang.String)(https://developer.android.com/reference/java/lang/String name) `

Open for reading, a resource of the specified name from the search path used to load classes.
` static https://developer.android.com/reference/java/util/Enumeration<https://developer.android.com/reference/java/net/URL>` ` https://developer.android.com/reference/java/lang/ClassLoader#getSystemResources(java.lang.String)(https://developer.android.com/reference/java/lang/String name) `

Finds all resources of the specified name from the search path used to load classes.
` https://developer.android.com/reference/java/lang/Class<?>` ` https://developer.android.com/reference/java/lang/ClassLoader#loadClass(java.lang.String,%20boolean)(https://developer.android.com/reference/java/lang/String name, boolean resolve) `

Loads the class with the specified [binary name](https://developer.android.com/reference/dalvik/system/BaseDexClassLoader#binary-name).
` https://developer.android.com/reference/java/lang/Class<?>` ` https://developer.android.com/reference/java/lang/ClassLoader#loadClass(java.lang.String)(https://developer.android.com/reference/java/lang/String name) `

Loads the class with the specified [binary name](https://developer.android.com/reference/dalvik/system/BaseDexClassLoader#binary-name).
` static boolean` ` https://developer.android.com/reference/java/lang/ClassLoader#registerAsParallelCapable()() `

Registers the caller as `#isRegisteredAsParallelCapable() parallel capable`.
` final void` ` https://developer.android.com/reference/java/lang/ClassLoader#resolveClass(java.lang.Class<?>)(https://developer.android.com/reference/java/lang/Class<?> c) `

Links the specified class.
` void` ` https://developer.android.com/reference/java/lang/ClassLoader#setClassAssertionStatus(java.lang.String,%20boolean)(https://developer.android.com/reference/java/lang/String className, boolean enabled) `

Sets the desired assertion status for the named top-level class in this class loader and any nested classes contained therein.
` void` ` https://developer.android.com/reference/java/lang/ClassLoader#setDefaultAssertionStatus(boolean)(boolean enabled) `

Sets the default assertion status for this class loader.
` void` ` https://developer.android.com/reference/java/lang/ClassLoader#setPackageAssertionStatus(java.lang.String,%20boolean)(https://developer.android.com/reference/java/lang/String packageName, boolean enabled) `

Sets the package default assertion status for the named package.
` final void` ` https://developer.android.com/reference/java/lang/ClassLoader#setSigners(java.lang.Class<?>,%20java.lang.Object[])(https://developer.android.com/reference/java/lang/Class<?> c, https://developer.android.com/reference/java/lang/Object signers) `

Sets the signers of a class.
From class ` https://developer.android.com/reference/java/lang/Object ` ` https://developer.android.com/reference/java/lang/Object` ` https://developer.android.com/reference/java/lang/Object#clone()() `

Creates and returns a copy of this object.
` boolean` ` https://developer.android.com/reference/java/lang/Object#equals(java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj) `

Indicates whether some other object is "equal to" this one.
` void` ` https://developer.android.com/reference/java/lang/Object#finalize()() `

Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
` final https://developer.android.com/reference/java/lang/Class<?>` ` https://developer.android.com/reference/java/lang/Object#getClass()() `

Returns the runtime class of this `Object`.
` int` ` https://developer.android.com/reference/java/lang/Object#hashCode()() `

Returns a hash code value for the object.
` final void` ` https://developer.android.com/reference/java/lang/Object#notify()() `

Wakes up a single thread that is waiting on this object's monitor.
` final void` ` https://developer.android.com/reference/java/lang/Object#notifyAll()() `

Wakes up all threads that are waiting on this object's monitor.
` https://developer.android.com/reference/java/lang/String` ` https://developer.android.com/reference/java/lang/Object#toString()() `

Returns a string representation of the object.
` final void` ` https://developer.android.com/reference/java/lang/Object#wait(long,%20int)(long timeoutMillis, int nanos) `

Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*, or until a certain amount of real time has elapsed.
` final void` ` https://developer.android.com/reference/java/lang/Object#wait(long)(long timeoutMillis) `

Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*, or until a certain amount of real time has elapsed.
` final void` ` https://developer.android.com/reference/java/lang/Object#wait()() `

Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*.

## Public constructors

### BaseDexClassLoader

Added in [API level 14](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public BaseDexClassLoader (String dexPath, 
                File optimizedDirectory, 
                String librarySearchPath, 
                ClassLoader parent)
```

Constructs an instance. Note that all the \*.jar and \*.apk files from `dexPath` might be first extracted in-memory before the code is loaded. This can be avoided by passing raw dex files (\*.dex) in the `dexPath`.

<br />

| Parameters ||
|---|---|
| `dexPath` | `String`: the list of jar/apk files containing classes and resources, delimited by `File.pathSeparator`, which defaults to `":"` on Android. <br /> |
| `optimizedDirectory` | `File`: this parameter is deprecated and has no effect since API level 26. <br /> |
| `librarySearchPath` | `String`: the list of directories containing native libraries, delimited by `File.pathSeparator`; may be `null` <br /> |
| `parent` | `ClassLoader`: the parent class loader <br /> |

## Public methods

### findLibrary

Added in [API level 14](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public String findLibrary (String name)
```

Returns the absolute path name of a native library. The VM invokes this method to locate the native libraries that belong to classes loaded with this class loader. If this method returns `null`, the VM searches the library along the path specified as the "`java.library.path`" property.

<br />

| Parameters ||
|---|---|
| `name` | `String`: The library name <br /> |

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/String` | The absolute path of the native library <br /> |

### toString

Added in [API level 14](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public String toString ()
```

Returns a string representation of the object.

<br />

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/String` | a string representation of the object. <br /> |

## Protected methods

### findClass

Added in [API level 14](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
protected Class<?> findClass (String name)
```

Finds the class with the specified [binary name](https://developer.android.com/reference/dalvik/system/BaseDexClassLoader#binary-name). This method should be overridden by class loader implementations that follow the delegation model for loading classes, and will be invoked by the `https://developer.android.com/reference/java/lang/ClassLoader#loadClass(java.lang.String)` method after checking the parent class loader for the requested class.

<br />

| Parameters ||
|---|---|
| `name` | `String`: The [binary name](https://developer.android.com/reference/dalvik/system/BaseDexClassLoader#binary-name) of the class <br /> |

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/Class<?>` | The resulting `Class` object <br /> |

| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ClassNotFoundException` |   |

### findResource

Added in [API level 14](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
protected URL findResource (String name)
```

Finds the resource with the given name. Class loader implementations should override this method.

<br />

| Parameters ||
|---|---|
| `name` | `String`: The resource name <br /> |

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/net/URL` | `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. <br /> |

### findResources

Added in [API level 14](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
protected Enumeration<URL> findResources (String name)
```

Returns an enumeration of `https://developer.android.com/reference/java/net/URL` objects representing all the resources with the given name. Class loader implementations should override this method.

<br />

| Parameters ||
|---|---|
| `name` | `String`: The resource name <br /> |

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/util/Enumeration<https://developer.android.com/reference/java/net/URL>` | An enumeration of `https://developer.android.com/reference/java/net/URL` 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. <br /> |

### getPackage

Added in [API level 14](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
protected Package getPackage (String name)
```

<br />

**This method is deprecated.**   

See `https://developer.android.com/reference/java/lang/ClassLoader#getPackage(java.lang.String)`

Returns package information for the given package. Unfortunately, instances of this class don't really have this information, and as a non-secure `ClassLoader`, it isn't even required to, according to the spec. Yet, we want to provide it, in order to make all those hopeful callers of `myClass.getPackage().getName()` happy. Thus we construct a `Package` object the first time it is being requested and fill most of the fields with fake values. The `Package` object is then put into the `ClassLoader`'s package cache, so we see the same one next time. We don't create `Package` objects for `null` arguments or for the default package.

There is a limited chance that we end up with multiple `Package` objects representing the same package: It can happen when when a package is scattered across different JAR files which were loaded by different `ClassLoader` instances. This is rather unlikely, and given that this whole thing is more or less a workaround, probably not worth the effort to address.

<br />

| Parameters ||
|---|---|
| `name` | `String`: the name of the class <br /> |

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/Package` | the package information for the class, or `null` if there is no package information available for it <br /> |