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A library jar that provides APIs for Applications written for the Google Android Platform.
/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.multidex;
import android.app.Application;
import android.app.Instrumentation;
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.os.Build;
import android.util.Log;
import dalvik.system.DexFile;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.ListIterator;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.zip.ZipFile;
/**
* MultiDex patches {@link Context#getClassLoader() the application context class
* loader} in order to load classes from more than one dex file. The primary
* {@code classes.dex} must contain the classes necessary for calling this
* class methods. Secondary dex files named classes2.dex, classes3.dex... found
* in the application apk will be added to the classloader after first call to
* {@link #install(Context)}.
*
*
* This library provides compatibility for platforms with API level 4 through 20. This library does
* nothing on newer versions of the platform which provide built-in support for secondary dex files.
*/
public final class MultiDex {
static final String TAG = "MultiDex";
private static final String OLD_SECONDARY_FOLDER_NAME = "secondary-dexes";
private static final String CODE_CACHE_NAME = "code_cache";
private static final String CODE_CACHE_SECONDARY_FOLDER_NAME = "secondary-dexes";
private static final int MAX_SUPPORTED_SDK_VERSION = 20;
private static final int MIN_SDK_VERSION = 4;
private static final int VM_WITH_MULTIDEX_VERSION_MAJOR = 2;
private static final int VM_WITH_MULTIDEX_VERSION_MINOR = 1;
private static final String NO_KEY_PREFIX = "";
private static final Set installedApk = new HashSet();
private static final boolean IS_VM_MULTIDEX_CAPABLE =
isVMMultidexCapable(System.getProperty("java.vm.version"));
private MultiDex() {}
/**
* Patches the application context class loader by appending extra dex files
* loaded from the application apk. This method should be called in the
* attachBaseContext of your {@link Application}, see
* {@link MultiDexApplication} for more explanation and an example.
*
* @param context application context.
* @throws RuntimeException if an error occurred preventing the classloader
* extension.
*/
public static void install(Context context) {
Log.i(TAG, "Installing application");
if (IS_VM_MULTIDEX_CAPABLE) {
Log.i(TAG, "VM has multidex support, MultiDex support library is disabled.");
return;
}
if (Build.VERSION.SDK_INT < MIN_SDK_VERSION) {
throw new RuntimeException("MultiDex installation failed. SDK " + Build.VERSION.SDK_INT
+ " is unsupported. Min SDK version is " + MIN_SDK_VERSION + ".");
}
try {
ApplicationInfo applicationInfo = getApplicationInfo(context);
if (applicationInfo == null) {
Log.i(TAG, "No ApplicationInfo available, i.e. running on a test Context:"
+ " MultiDex support library is disabled.");
return;
}
doInstallation(context,
new File(applicationInfo.sourceDir),
new File(applicationInfo.dataDir),
CODE_CACHE_SECONDARY_FOLDER_NAME,
NO_KEY_PREFIX,
true);
} catch (Exception e) {
Log.e(TAG, "MultiDex installation failure", e);
throw new RuntimeException("MultiDex installation failed (" + e.getMessage() + ").");
}
Log.i(TAG, "install done");
}
/**
* Patches the instrumentation context class loader by appending extra dex files
* loaded from the instrumentation apk and the application apk. This method should be called in
* the onCreate of your {@link Instrumentation}, see
* {@link com.android.test.runner.MultiDexTestRunner} for an example.
*
* @param instrumentationContext instrumentation context.
* @param targetContext target application context.
* @throws RuntimeException if an error occurred preventing the classloader
* extension.
*/
public static void installInstrumentation(Context instrumentationContext,
Context targetContext) {
Log.i(TAG, "Installing instrumentation");
if (IS_VM_MULTIDEX_CAPABLE) {
Log.i(TAG, "VM has multidex support, MultiDex support library is disabled.");
return;
}
if (Build.VERSION.SDK_INT < MIN_SDK_VERSION) {
throw new RuntimeException("MultiDex installation failed. SDK " + Build.VERSION.SDK_INT
+ " is unsupported. Min SDK version is " + MIN_SDK_VERSION + ".");
}
try {
ApplicationInfo instrumentationInfo = getApplicationInfo(instrumentationContext);
if (instrumentationInfo == null) {
Log.i(TAG, "No ApplicationInfo available for instrumentation, i.e. running on a"
+ " test Context: MultiDex support library is disabled.");
return;
}
ApplicationInfo applicationInfo = getApplicationInfo(targetContext);
if (applicationInfo == null) {
Log.i(TAG, "No ApplicationInfo available, i.e. running on a test Context:"
+ " MultiDex support library is disabled.");
return;
}
String instrumentationPrefix = instrumentationContext.getPackageName() + ".";
File dataDir = new File(applicationInfo.dataDir);
doInstallation(targetContext,
new File(instrumentationInfo.sourceDir),
dataDir,
instrumentationPrefix + CODE_CACHE_SECONDARY_FOLDER_NAME,
instrumentationPrefix,
false);
doInstallation(targetContext,
new File(applicationInfo.sourceDir),
dataDir,
CODE_CACHE_SECONDARY_FOLDER_NAME,
NO_KEY_PREFIX,
false);
} catch (Exception e) {
Log.e(TAG, "MultiDex installation failure", e);
throw new RuntimeException("MultiDex installation failed (" + e.getMessage() + ").");
}
Log.i(TAG, "Installation done");
}
/**
* @param mainContext context used to get filesDir, to save preference and to get the
* classloader to patch.
* @param sourceApk Apk file.
* @param dataDir data directory to use for code cache simulation.
* @param secondaryFolderName name of the folder for storing extractions.
* @param prefsKeyPrefix prefix of all stored preference keys.
* @param reinstallOnPatchRecoverableException if set to true, will attempt a clean extraction
* if a possibly recoverable exception occurs during classloader patching.
*/
private static void doInstallation(Context mainContext, File sourceApk, File dataDir,
String secondaryFolderName, String prefsKeyPrefix,
boolean reinstallOnPatchRecoverableException) throws IOException,
IllegalArgumentException, IllegalAccessException, NoSuchFieldException,
InvocationTargetException, NoSuchMethodException, SecurityException,
ClassNotFoundException, InstantiationException {
synchronized (installedApk) {
if (installedApk.contains(sourceApk)) {
return;
}
installedApk.add(sourceApk);
if (Build.VERSION.SDK_INT > MAX_SUPPORTED_SDK_VERSION) {
Log.w(TAG, "MultiDex is not guaranteed to work in SDK version "
+ Build.VERSION.SDK_INT + ": SDK version higher than "
+ MAX_SUPPORTED_SDK_VERSION + " should be backed by "
+ "runtime with built-in multidex capabilty but it's not the "
+ "case here: java.vm.version=\""
+ System.getProperty("java.vm.version") + "\"");
}
/* The patched class loader is expected to be a ClassLoader capable of loading DEX
* bytecode. We modify its pathList field to append additional DEX file entries.
*/
ClassLoader loader = getDexClassloader(mainContext);
if (loader == null) {
return;
}
try {
clearOldDexDir(mainContext);
} catch (Throwable t) {
Log.w(TAG, "Something went wrong when trying to clear old MultiDex extraction, "
+ "continuing without cleaning.", t);
}
File dexDir = getDexDir(mainContext, dataDir, secondaryFolderName);
// MultiDexExtractor is taking the file lock and keeping it until it is closed.
// Keep it open during installSecondaryDexes and through forced extraction to ensure no
// extraction or optimizing dexopt is running in parallel.
MultiDexExtractor extractor = new MultiDexExtractor(sourceApk, dexDir);
IOException closeException = null;
try {
List files =
extractor.load(mainContext, prefsKeyPrefix, false);
try {
installSecondaryDexes(loader, dexDir, files);
// Some IOException causes may be fixed by a clean extraction.
} catch (IOException e) {
if (!reinstallOnPatchRecoverableException) {
throw e;
}
Log.w(TAG, "Failed to install extracted secondary dex files, retrying with "
+ "forced extraction", e);
files = extractor.load(mainContext, prefsKeyPrefix, true);
installSecondaryDexes(loader, dexDir, files);
}
} finally {
try {
extractor.close();
} catch (IOException e) {
// Delay throw of close exception to ensure we don't override some exception
// thrown during the try block.
closeException = e;
}
}
if (closeException != null) {
throw closeException;
}
}
}
/**
* Returns a {@link Classloader} from the {@link Context} that is capable of reading dex
* bytecode or null if the Classloader is not dex-capable e.g: when running on a JVM testing
* environment such as Robolectric.
*/
private static ClassLoader getDexClassloader(Context context) {
ClassLoader loader;
try {
loader = context.getClassLoader();
} catch (RuntimeException e) {
/* Ignore those exceptions so that we don't break tests relying on Context like
* a android.test.mock.MockContext or a android.content.ContextWrapper with a
* null base Context.
*/
Log.w(TAG, "Failure while trying to obtain Context class loader. "
+ "Must be running in test mode. Skip patching.", e);
return null;
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
if (loader instanceof dalvik.system.BaseDexClassLoader) {
return loader;
}
} else if (loader instanceof dalvik.system.DexClassLoader
|| loader instanceof dalvik.system.PathClassLoader) {
return loader;
}
Log.e(TAG, "Context class loader is null or not dex-capable. "
+ "Must be running in test mode. Skip patching.");
return null;
}
private static ApplicationInfo getApplicationInfo(Context context) {
try {
/* Due to package install races it is possible for a process to be started from an old
* apk even though that apk has been replaced. Querying for ApplicationInfo by package
* name may return information for the new apk, leading to a runtime with the old main
* dex file and new secondary dex files. This leads to various problems like
* ClassNotFoundExceptions. Using context.getApplicationInfo() should result in the
* process having a consistent view of the world (even if it is of the old world). The
* package install races are eventually resolved and old processes are killed.
*/
return context.getApplicationInfo();
} catch (RuntimeException e) {
/* Ignore those exceptions so that we don't break tests relying on Context like
* a android.test.mock.MockContext or a android.content.ContextWrapper with a null
* base Context.
*/
Log.w(TAG, "Failure while trying to obtain ApplicationInfo from Context. " +
"Must be running in test mode. Skip patching.", e);
return null;
}
}
/**
* Identifies if the current VM has a native support for multidex, meaning there is no need for
* additional installation by this library.
* @return true if the VM handles multidex
*/
/* package visible for test */
static boolean isVMMultidexCapable(String versionString) {
boolean isMultidexCapable = false;
if (versionString != null) {
StringTokenizer tokenizer = new StringTokenizer(versionString, ".");
String majorToken = tokenizer.hasMoreTokens() ? tokenizer.nextToken() : null;
String minorToken = tokenizer.hasMoreTokens() ? tokenizer.nextToken() : null;
if (majorToken != null && minorToken != null) {
try {
int major = Integer.parseInt(majorToken);
int minor = Integer.parseInt(minorToken);
isMultidexCapable = (major > VM_WITH_MULTIDEX_VERSION_MAJOR)
|| ((major == VM_WITH_MULTIDEX_VERSION_MAJOR)
&& (minor >= VM_WITH_MULTIDEX_VERSION_MINOR));
} catch (NumberFormatException e) {
// let isMultidexCapable be false
}
}
}
Log.i(TAG, "VM with version " + versionString +
(isMultidexCapable ?
" has multidex support" :
" does not have multidex support"));
return isMultidexCapable;
}
private static void installSecondaryDexes(ClassLoader loader, File dexDir,
List files)
throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException,
InvocationTargetException, NoSuchMethodException, IOException, SecurityException,
ClassNotFoundException, InstantiationException {
if (!files.isEmpty()) {
if (Build.VERSION.SDK_INT >= 19) {
V19.install(loader, files, dexDir);
} else if (Build.VERSION.SDK_INT >= 14) {
V14.install(loader, files);
} else {
V4.install(loader, files);
}
}
}
/**
* Locates a given field anywhere in the class inheritance hierarchy.
*
* @param instance an object to search the field into.
* @param name field name
* @return a field object
* @throws NoSuchFieldException if the field cannot be located
*/
private static Field findField(Object instance, String name) throws NoSuchFieldException {
for (Class clazz = instance.getClass(); clazz != null; clazz = clazz.getSuperclass()) {
try {
Field field = clazz.getDeclaredField(name);
if (!field.isAccessible()) {
field.setAccessible(true);
}
return field;
} catch (NoSuchFieldException e) {
// ignore and search next
}
}
throw new NoSuchFieldException("Field " + name + " not found in " + instance.getClass());
}
/**
* Locates a given method anywhere in the class inheritance hierarchy.
*
* @param instance an object to search the method into.
* @param name method name
* @param parameterTypes method parameter types
* @return a method object
* @throws NoSuchMethodException if the method cannot be located
*/
private static Method findMethod(Object instance, String name, Class... parameterTypes)
throws NoSuchMethodException {
for (Class clazz = instance.getClass(); clazz != null; clazz = clazz.getSuperclass()) {
try {
Method method = clazz.getDeclaredMethod(name, parameterTypes);
if (!method.isAccessible()) {
method.setAccessible(true);
}
return method;
} catch (NoSuchMethodException e) {
// ignore and search next
}
}
throw new NoSuchMethodException("Method " + name + " with parameters " +
Arrays.asList(parameterTypes) + " not found in " + instance.getClass());
}
/**
* Replace the value of a field containing a non null array, by a new array containing the
* elements of the original array plus the elements of extraElements.
* @param instance the instance whose field is to be modified.
* @param fieldName the field to modify.
* @param extraElements elements to append at the end of the array.
*/
private static void expandFieldArray(Object instance, String fieldName,
Object[] extraElements) throws NoSuchFieldException, IllegalArgumentException,
IllegalAccessException {
Field jlrField = findField(instance, fieldName);
Object[] original = (Object[]) jlrField.get(instance);
Object[] combined = (Object[]) Array.newInstance(
original.getClass().getComponentType(), original.length + extraElements.length);
System.arraycopy(original, 0, combined, 0, original.length);
System.arraycopy(extraElements, 0, combined, original.length, extraElements.length);
jlrField.set(instance, combined);
}
private static void clearOldDexDir(Context context) throws Exception {
File dexDir = new File(context.getFilesDir(), OLD_SECONDARY_FOLDER_NAME);
if (dexDir.isDirectory()) {
Log.i(TAG, "Clearing old secondary dex dir (" + dexDir.getPath() + ").");
File[] files = dexDir.listFiles();
if (files == null) {
Log.w(TAG, "Failed to list secondary dex dir content (" + dexDir.getPath() + ").");
return;
}
for (File oldFile : files) {
Log.i(TAG, "Trying to delete old file " + oldFile.getPath() + " of size "
+ oldFile.length());
if (!oldFile.delete()) {
Log.w(TAG, "Failed to delete old file " + oldFile.getPath());
} else {
Log.i(TAG, "Deleted old file " + oldFile.getPath());
}
}
if (!dexDir.delete()) {
Log.w(TAG, "Failed to delete secondary dex dir " + dexDir.getPath());
} else {
Log.i(TAG, "Deleted old secondary dex dir " + dexDir.getPath());
}
}
}
private static File getDexDir(Context context, File dataDir, String secondaryFolderName)
throws IOException {
File cache = new File(dataDir, CODE_CACHE_NAME);
try {
mkdirChecked(cache);
} catch (IOException e) {
/* If we can't emulate code_cache, then store to filesDir. This means abandoning useless
* files on disk if the device ever updates to android 5+. But since this seems to
* happen only on some devices running android 2, this should cause no pollution.
*/
cache = new File(context.getFilesDir(), CODE_CACHE_NAME);
mkdirChecked(cache);
}
File dexDir = new File(cache, secondaryFolderName);
mkdirChecked(dexDir);
return dexDir;
}
private static void mkdirChecked(File dir) throws IOException {
dir.mkdir();
if (!dir.isDirectory()) {
File parent = dir.getParentFile();
if (parent == null) {
Log.e(TAG, "Failed to create dir " + dir.getPath() + ". Parent file is null.");
} else {
Log.e(TAG, "Failed to create dir " + dir.getPath() +
". parent file is a dir " + parent.isDirectory() +
", a file " + parent.isFile() +
", exists " + parent.exists() +
", readable " + parent.canRead() +
", writable " + parent.canWrite());
}
throw new IOException("Failed to create directory " + dir.getPath());
}
}
/**
* Installer for platform versions 19.
*/
private static final class V19 {
static void install(ClassLoader loader,
List additionalClassPathEntries,
File optimizedDirectory)
throws IllegalArgumentException, IllegalAccessException,
NoSuchFieldException, InvocationTargetException, NoSuchMethodException,
IOException {
/* The patched class loader is expected to be a descendant of
* dalvik.system.BaseDexClassLoader. We modify its
* dalvik.system.DexPathList pathList field to append additional DEX
* file entries.
*/
Field pathListField = findField(loader, "pathList");
Object dexPathList = pathListField.get(loader);
ArrayList suppressedExceptions = new ArrayList();
expandFieldArray(dexPathList, "dexElements", makeDexElements(dexPathList,
new ArrayList(additionalClassPathEntries), optimizedDirectory,
suppressedExceptions));
if (suppressedExceptions.size() > 0) {
for (IOException e : suppressedExceptions) {
Log.w(TAG, "Exception in makeDexElement", e);
}
Field suppressedExceptionsField =
findField(dexPathList, "dexElementsSuppressedExceptions");
IOException[] dexElementsSuppressedExceptions =
(IOException[]) suppressedExceptionsField.get(dexPathList);
if (dexElementsSuppressedExceptions == null) {
dexElementsSuppressedExceptions =
suppressedExceptions.toArray(
new IOException[suppressedExceptions.size()]);
} else {
IOException[] combined =
new IOException[suppressedExceptions.size() +
dexElementsSuppressedExceptions.length];
suppressedExceptions.toArray(combined);
System.arraycopy(dexElementsSuppressedExceptions, 0, combined,
suppressedExceptions.size(), dexElementsSuppressedExceptions.length);
dexElementsSuppressedExceptions = combined;
}
suppressedExceptionsField.set(dexPathList, dexElementsSuppressedExceptions);
IOException exception = new IOException("I/O exception during makeDexElement");
exception.initCause(suppressedExceptions.get(0));
throw exception;
}
}
/**
* A wrapper around
* {@code private static final dalvik.system.DexPathList#makeDexElements}.
*/
private static Object[] makeDexElements(
Object dexPathList, ArrayList files, File optimizedDirectory,
ArrayList suppressedExceptions)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException {
Method makeDexElements =
findMethod(dexPathList, "makeDexElements", ArrayList.class, File.class,
ArrayList.class);
return (Object[]) makeDexElements.invoke(dexPathList, files, optimizedDirectory,
suppressedExceptions);
}
}
/**
* Installer for platform versions 14, 15, 16, 17 and 18.
*/
private static final class V14 {
private interface ElementConstructor {
Object newInstance(File file, DexFile dex)
throws IllegalArgumentException, InstantiationException,
IllegalAccessException, InvocationTargetException, IOException;
}
/**
* Applies for ICS and early JB (initial release and MR1).
*/
private static class ICSElementConstructor implements ElementConstructor {
private final Constructor elementConstructor;
ICSElementConstructor(Class elementClass)
throws SecurityException, NoSuchMethodException {
elementConstructor =
elementClass.getConstructor(File.class, ZipFile.class, DexFile.class);
elementConstructor.setAccessible(true);
}
@Override
public Object newInstance(File file, DexFile dex)
throws IllegalArgumentException, InstantiationException,
IllegalAccessException, InvocationTargetException, IOException {
return elementConstructor.newInstance(file, new ZipFile(file), dex);
}
}
/**
* Applies for some intermediate JB (MR1.1).
*
* See Change-Id: I1a5b5d03572601707e1fb1fd4424c1ae2fd2217d
*/
private static class JBMR11ElementConstructor implements ElementConstructor {
private final Constructor elementConstructor;
JBMR11ElementConstructor(Class elementClass)
throws SecurityException, NoSuchMethodException {
elementConstructor = elementClass
.getConstructor(File.class, File.class, DexFile.class);
elementConstructor.setAccessible(true);
}
@Override
public Object newInstance(File file, DexFile dex)
throws IllegalArgumentException, InstantiationException,
IllegalAccessException, InvocationTargetException {
return elementConstructor.newInstance(file, file, dex);
}
}
/**
* Applies for latest JB (MR2).
*
* See Change-Id: Iec4dca2244db9c9c793ac157e258fd61557a7a5d
*/
private static class JBMR2ElementConstructor implements ElementConstructor {
private final Constructor elementConstructor;
JBMR2ElementConstructor(Class elementClass)
throws SecurityException, NoSuchMethodException {
elementConstructor = elementClass
.getConstructor(File.class, Boolean.TYPE, File.class, DexFile.class);
elementConstructor.setAccessible(true);
}
@Override
public Object newInstance(File file, DexFile dex)
throws IllegalArgumentException, InstantiationException,
IllegalAccessException, InvocationTargetException {
return elementConstructor.newInstance(file, Boolean.FALSE, file, dex);
}
}
private static final int EXTRACTED_SUFFIX_LENGTH =
MultiDexExtractor.EXTRACTED_SUFFIX.length();
private final ElementConstructor elementConstructor;
static void install(ClassLoader loader,
List additionalClassPathEntries)
throws IOException, SecurityException, IllegalArgumentException,
ClassNotFoundException, NoSuchMethodException, InstantiationException,
IllegalAccessException, InvocationTargetException, NoSuchFieldException {
/* The patched class loader is expected to be a descendant of
* dalvik.system.BaseDexClassLoader. We modify its
* dalvik.system.DexPathList pathList field to append additional DEX
* file entries.
*/
Field pathListField = findField(loader, "pathList");
Object dexPathList = pathListField.get(loader);
Object[] elements = new V14().makeDexElements(additionalClassPathEntries);
try {
expandFieldArray(dexPathList, "dexElements", elements);
} catch (NoSuchFieldException e) {
// dexElements was renamed pathElements for a short period during JB development,
// eventually it was renamed back shortly after.
Log.w(TAG, "Failed find field 'dexElements' attempting 'pathElements'", e);
expandFieldArray(dexPathList, "pathElements", elements);
}
}
private V14() throws ClassNotFoundException, SecurityException, NoSuchMethodException {
ElementConstructor constructor;
Class elementClass = Class.forName("dalvik.system.DexPathList$Element");
try {
constructor = new ICSElementConstructor(elementClass);
} catch (NoSuchMethodException e1) {
try {
constructor = new JBMR11ElementConstructor(elementClass);
} catch (NoSuchMethodException e2) {
constructor = new JBMR2ElementConstructor(elementClass);
}
}
this.elementConstructor = constructor;
}
/**
* An emulation of {@code private static final dalvik.system.DexPathList#makeDexElements}
* accepting only extracted secondary dex files.
* OS version is catching IOException and just logging some of them, this version is letting
* them through.
*/
private Object[] makeDexElements(List files)
throws IOException, SecurityException, IllegalArgumentException,
InstantiationException, IllegalAccessException, InvocationTargetException {
Object[] elements = new Object[files.size()];
for (int i = 0; i < elements.length; i++) {
File file = files.get(i);
elements[i] = elementConstructor.newInstance(
file,
DexFile.loadDex(file.getPath(), optimizedPathFor(file), 0));
}
return elements;
}
/**
* Converts a zip file path of an extracted secondary dex to an output file path for an
* associated optimized dex file.
*/
private static String optimizedPathFor(File path) {
// Any reproducible name ending with ".dex" should do but lets keep the same name
// as DexPathList.optimizedPathFor
File optimizedDirectory = path.getParentFile();
String fileName = path.getName();
String optimizedFileName =
fileName.substring(0, fileName.length() - EXTRACTED_SUFFIX_LENGTH)
+ MultiDexExtractor.DEX_SUFFIX;
File result = new File(optimizedDirectory, optimizedFileName);
return result.getPath();
}
}
/**
* Installer for platform versions 4 to 13.
*/
private static final class V4 {
static void install(ClassLoader loader,
List additionalClassPathEntries)
throws IllegalArgumentException, IllegalAccessException,
NoSuchFieldException, IOException {
/* The patched class loader is expected to be a descendant of
* dalvik.system.DexClassLoader. We modify its
* fields mPaths, mFiles, mZips and mDexs to append additional DEX
* file entries.
*/
int extraSize = additionalClassPathEntries.size();
Field pathField = findField(loader, "path");
StringBuilder path = new StringBuilder((String) pathField.get(loader));
String[] extraPaths = new String[extraSize];
File[] extraFiles = new File[extraSize];
ZipFile[] extraZips = new ZipFile[extraSize];
DexFile[] extraDexs = new DexFile[extraSize];
for (ListIterator iterator = additionalClassPathEntries.listIterator();
iterator.hasNext();) {
File additionalEntry = iterator.next();
String entryPath = additionalEntry.getAbsolutePath();
path.append(':').append(entryPath);
int index = iterator.previousIndex();
extraPaths[index] = entryPath;
extraFiles[index] = additionalEntry;
extraZips[index] = new ZipFile(additionalEntry);
extraDexs[index] = DexFile.loadDex(entryPath, entryPath + ".dex", 0);
}
pathField.set(loader, path.toString());
expandFieldArray(loader, "mPaths", extraPaths);
expandFieldArray(loader, "mFiles", extraFiles);
expandFieldArray(loader, "mZips", extraZips);
expandFieldArray(loader, "mDexs", extraDexs);
}
}
}