Added in API level 1

Summary: Nested Classes | Ctors | Methods | Protected Methods | Inherited Methods

DexFile

public final class DexFile
extends Object

java.lang.Object
↳	dalvik.system.DexFile

Loads DEX files. This class is meant for internal use and should not be used by applications. Applications should not instantiate this class. It will hurt performance in most cases and will lead to incorrect execution of bytecode in the worst case. Applications should use one of the standard classloaders such as PathClassLoader instead. Non-static APIs will be removed in a future Android release.

Summary

Nested classes
`class`	`DexFile.OptimizationInfo` Encapsulates information about the optimizations performed on a dex file.

Public constructors
`DexFile(File file)` This constructor is deprecated. Applications should use one of the standard classloaders such as `PathClassLoader` instead. This API will be removed in a future Android release.
`DexFile(String fileName)` This constructor is deprecated. Applications should use one of the standard classloaders such as `PathClassLoader` instead. This API will be removed in a future Android release.

Public methods
`void`	`close()` This method was deprecated in API level 26. Applications should use one of the standard classloaders such as `PathClassLoader` instead. This API will be removed in a future Android release.
`Enumeration<String>`	`entries()` This method was deprecated in API level 26. Applications should use one of the standard classloaders such as `PathClassLoader` instead. This API will be removed in a future Android release.
`String`	`getName()` This method was deprecated in API level 26. Applications should use one of the standard classloaders such as `PathClassLoader` instead. This API will be removed in a future Android release.
`static boolean`	`isDexOptNeeded(String fileName)` This method was deprecated in API level 26. Use `Artd.getDexoptNeeded` instead.
`Class<T>`	`loadClass(String name, ClassLoader loader)` This method was deprecated in API level 26. Applications should use one of the standard classloaders such as `PathClassLoader` instead. This API will be removed in a future Android release.
`static DexFile`	`loadDex(String sourcePathName, String outputPathName, int flags)` This method was deprecated in API level 26. Applications should use one of the standard classloaders such as `PathClassLoader` instead. This API will be removed in a future Android release.
`String`	`toString()` Returns a string representation of the object.

Protected methods
`void`	`finalize()` Called when the class is finalized.

Inherited methods

From class


        
          java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(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`	`wait(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`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

Public constructors

DexFile

Added in API level 1

public DexFile (File file)

This constructor is deprecated.
Applications should use one of the standard classloaders such as PathClassLoader instead. This API will be removed in a future Android release.

Opens a DEX file from a given File object.

Parameters
`file`	`File`

Throws
`IOException`

DexFile

Added in API level 1

public DexFile (String fileName)

This constructor is deprecated.
Applications should use one of the standard classloaders such as PathClassLoader instead. This API will be removed in a future Android release.

Opens a DEX file from a given filename.

Parameters
`fileName`	`String`

Throws
`IOException`

Public methods

close

Added in API level 1
Deprecated in API level 26

public void close ()

This method was deprecated in API level 26.
Applications should use one of the standard classloaders such as PathClassLoader instead. This API will be removed in a future Android release.

Closes the DEX file.

This may not be able to release all of the resources. If classes from this DEX file are still resident, the DEX file can't be unmapped. In the case where we do not release all the resources, close is called again in the finalizer.

Throws
`IOException`	if an I/O error occurs during closing the file, which normally should not happen

entries

Added in API level 1
Deprecated in API level 26

public Enumeration<String> entries ()

This method was deprecated in API level 26.
Applications should use one of the standard classloaders such as PathClassLoader instead. This API will be removed in a future Android release.

Enumerate the names of the classes in this DEX file.

Returns
`Enumeration<String>`	an enumeration of names of classes contained in the DEX file, in the usual internal form (like "java/lang/String").

getName

Added in API level 1
Deprecated in API level 26

public String getName ()

This method was deprecated in API level 26.
Applications should use one of the standard classloaders such as PathClassLoader instead. This API will be removed in a future Android release.

Gets the name of the (already opened) DEX file.

Returns
`String`	the file name

isDexOptNeeded

Added in API level 1
Deprecated in API level 26

public static boolean isDexOptNeeded (String fileName)

This method was deprecated in API level 26.
Use Artd.getDexoptNeeded instead.

Returns true if the VM believes that the apk/jar file is out of date and should be passed through "dexopt" again.

Parameters
`fileName`	`String`: the absolute path to the apk/jar file to examine.

Returns
`boolean`	true if dexopt should be called on the file, false otherwise.

Throws
`FileNotFoundException`	if fileName is not readable, not a file, or not present.
`IOException`	if fileName is not a valid apk/jar file or if problems occur while parsing it.
`NullPointerException`	if fileName is null.

loadClass

Added in API level 1
Deprecated in API level 26

public Class<T> loadClass (String name, 
                ClassLoader loader)

This method was deprecated in API level 26.
Applications should use one of the standard classloaders such as PathClassLoader instead. This API will be removed in a future Android release.

Loads a class. Returns the class on success, or a null reference on failure.

If you are not calling this from a class loader, this is most likely not going to do what you want. Use Class.forName(String) instead.

The method does not throw ClassNotFoundException if the class isn't found because it isn't reasonable to throw exceptions wildly every time a class is not found in the first DEX file we look at.

Parameters
`name`	`String`: the class name, which should look like "java/lang/String"
`loader`	`ClassLoader`: the class loader that tries to load the class (in most cases the caller of the method

Returns
`Class<T>`	the `Class` object representing the class, or `null` if the class cannot be loaded

loadDex

Added in API level 3
Deprecated in API level 26

public static DexFile loadDex (String sourcePathName, 
                String outputPathName, 
                int flags)

This method was deprecated in API level 26.
Applications should use one of the standard classloaders such as PathClassLoader instead. This API will be removed in a future Android release.

Open a DEX file, specifying the file in which the optimized DEX data should be written. If the optimized form exists and appears to be current, it will be used; if not, the VM will attempt to regenerate it.

Parameters
`sourcePathName`	`String`
`outputPathName`	`String`
`flags`	`int`

Returns
`DexFile`

Throws
`IOException`

toString

Added in API level 1

public String toString ()

Returns a string representation of the object.

Returns
`String`	a string representation of the object.

Protected methods

finalize

Added in API level 1

protected void finalize ()

Called when the class is finalized. Makes sure the DEX file is closed.

Throws
`IOException`	if an I/O error occurs during closing the file, which normally should not happen
`Throwable`

DexFile

Summary

Nested classes

Public constructors

Public methods

Protected methods

Inherited methods

Public constructors

DexFile

DexFile

Public methods

close

entries

getName

isDexOptNeeded

loadClass

loadDex

toString

Protected methods

finalize