2.Eclipse版本android 65535解决方案(原理等同android studio现在的分包方式)
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Ant介绍
什么是Ant
Apache Ant算是一个将软件编译、测试、部署等步骤联系在一起加以优化的一个构建（就是把代码从某个地方拿来、编译、再拷贝到某个地方去等操作）工具，常用语Java环境中的软件开发。ANt的默认配置文件是build.xml。
在项目中添加build.xml文件 然后文件内容如下所示
<project name="helloWorld"> <target name="sayHelloWorld"> <echo message="Hello,Amigo"/> </target></project>然后进入Cmd 定位到当前项目的路径 然后输入
ant sayHelloWorld // ant 后面为target标签下面 name属性里面的值结果截图为
Eclipse版本android 65535解决方案(原理等同android studio现在的分包方式)
由于工作的需要看了下Eclipse下android65535的解决方案，查了好多文档，真心的发自内心的说一句请不要再拷贝别人的博客了，害人，真害人。
接下来我说下我的实现方式，首先说下65535的最可能的触发原因(三方jar用的太多了)
1. 首先：合并jar
这里合并到jar使用的事ant的脚本，如何你电脑安装了ant，那ok，如果没有安装这里也不啰嗦告诉你怎么安装了，百度一下吧，安装总的来说没啥技术含量。安装ant之后配置如下脚本文件。
<?xml version="1.0" encoding="utf-8"?> <project name="b" basedir="D:\zytecwork_4\Android65535\libs" default="makeSuperJar"> <target name="makeSuperJar" description="description"> <jar destfile="all.jar"> <zipfileset src="eventbus-3.0.0-beta1.jar"/> <zipfileset src="glide-3.7.0.jar"/> <zipfileset src="gson-2.4.jar"/> <zipfileset src="httpmime-4.0.1.jar"/> <zipfileset src="jobqueue-1.1.2.jar"/> <zipfileset src="ksoap2-android-assembly-2.5.8-jar-with-dependencies.jar"/> <zipfileset src="logger.jar"/> <zipfileset src="mqtt3.jar"/> <zipfileset src="okhttp-3.4.1.jar"/> <zipfileset src="okio-1.10.0.jar"/> <zipfileset src="photo_view_library.jar"/> <zipfileset src="umeng_sdk.jar"/> <zipfileset src="universal-image-loader-1.9.3.jar"/> <zipfileset src="zxing.jar"/> </jar> </target> </project>这里你只需要改下你的basedir目录地址,destfile输出文件的名字和zipfileset你需要合并的jar即可。
其结果 ![这里写图片描述]
然后将合并的jar转换成dex文件，怎么找到dx工具，见图 
直接在当前路径下执行cmd命令，然后输入
dx --dex --output=D:\zytecwork_4\Android65535\libs\classes.dex D:\zytecwork_4\Android65535\libs\all.jar，'这里我写的是我自己的路径。输出文件为classes.dex,由于apk默认会将项目中的class文件编译成classes.dex，所以这里你需要更改下你的输出文件名，这里这个名字要有规范，严格的命名classes2.dex,classes3.dex…..,至于为什么，这是MultiDex的自己要求的，这里是仿Android sutudio的分包方式，请严格执行。 
之后将classes.dex文件放置到项目的src目录下即可。 现在执行你还差最后一步导入MutiDex类库，你可以在网上去下载，或者直接copy我下边的代码，这里最主要想说的是如何使用 在你的项目的Application类中配置如下代码：
一、在manifest文件中指定Application为MultiDexApplication,如下所示： 
二、让应用的Application继承MultiDexApplication,如下所示： 
三、如果不想让应用的Application继承MultiDexApplication，还可以选择重写Application的 
attachBaseContext方法，这个方法比Application的onCreate要先执行，如下所示：
public class App extends Application { @Override protected void attachBaseContext(Context base) { super.attachBaseContext(base); MultiDex.install(this); }}到这里基本上配置算是完成了，this all over. 一下是类库MultiDex的类库Code，有需要的直接拷贝即可，这里不作为关键点来分析 MultiDex类：
/* * 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 com.wisdozzh.android65535;import android.app.Application;import android.content.Context;import android.content.pm.ApplicationInfo;import android.content.pm.PackageManager;import android.content.pm.PackageManager.NameNotFoundException;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.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.regex.Matcher;import java.util.regex.Pattern;import java.util.zip.ZipFile;/** * Monkey 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)}. * * <p/> * 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 { public static final String TAG = "MultiDex"; private static final String OLD_SECONDARY_FOLDER_NAME = "secondary-dexes"; private static final String SECONDARY_FOLDER_NAME = "code_cache" + File.separator + "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 Set<String> installedApk = new HashSet<String>(); 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, "install"); 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("Multi dex installation failed. SDK " + Build.VERSION.SDK_INT + " is unsupported. Min SDK version is " + MIN_SDK_VERSION + "."); } try { ApplicationInfo applicationInfo = getApplicationInfo(context); if (applicationInfo == null) { // Looks like running on a test Context, so just return without patching. return; } synchronized (installedApk) { String apkPath = applicationInfo.sourceDir; if (installedApk.contains(apkPath)) { return; } installedApk.add(apkPath); 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 descendant of * dalvik.system.BaseDexClassLoader. We modify its * dalvik.system.DexPathList pathList field to append additional DEX * file entries. */ 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; } if (loader == null) { // Note, the context class loader is null when running Robolectric tests. Log.e(TAG, "Context class loader is null. Must be running in test mode. " + "Skip patching."); return; } try { clearOldDexDir(context); } catch (Throwable t) { Log.w(TAG, "Something went wrong when trying to clear old MultiDex extraction, " + "continuing without cleaning.", t); } File dexDir = new File(applicationInfo.dataDir, SECONDARY_FOLDER_NAME); List<File> files = MultiDexExtractor.load(context, applicationInfo, dexDir, false); if (checkValidZipFiles(files)) { installSecondaryDexes(loader, dexDir, files); } else { Log.w(TAG, "Files were not valid zip files. Forcing a reload."); // Try again, but this time force a reload of the zip file. files = MultiDexExtractor.load(context, applicationInfo, dexDir, true); if (checkValidZipFiles(files)) { installSecondaryDexes(loader, dexDir, files); } else { // Second time didn't work, give up throw new RuntimeException("Zip files were not valid."); } } } } catch (Exception e) { Log.e(TAG, "Multidex installation failure", e); throw new RuntimeException("Multi dex installation failed (" + e.getMessage() + ")."); } Log.i(TAG, "install done"); } private static ApplicationInfo getApplicationInfo(Context context) throws NameNotFoundException { PackageManager pm; String packageName; try { pm = context.getPackageManager(); packageName = context.getPackageName(); } 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; } if (pm == null || packageName == null) { // This is most likely a mock context, so just return without patching. return null; } ApplicationInfo applicationInfo = pm.getApplicationInfo(packageName, PackageManager.GET_META_DATA); return applicationInfo; } /** * 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) { Matcher matcher = Pattern.compile("(\\d+)\\.(\\d+)(\\.\\d+)?").matcher(versionString); if (matcher.matches()) { try { int major = Integer.parseInt(matcher.group(1)); int minor = Integer.parseInt(matcher.group(2)); 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<File> files) throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, InvocationTargetException, NoSuchMethodException, IOException { 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, dexDir); } else { V4.install(loader, files); } } } /** * Returns whether all files in the list are valid zip files. If {@code files} is empty, then * returns true. */ private static boolean checkValidZipFiles(List<File> files) { for (File file : files) { if (!MultiDexExtractor.verifyZipFile(file)) { return false; } } return true; } /** * 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()); } } } /** * Installer for platform versions 19. */ private static final class V19 { private static void install(ClassLoader loader, List<File> additionalClassPathEntries, File optimizedDirectory) throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, InvocationTargetException, NoSuchMethodException { /* 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<IOException> suppressedExceptions = new ArrayList<IOException>(); expandFieldArray(dexPathList, "dexElements", makeDexElements(dexPathList, new ArrayList<File>(additionalClassPathEntries), optimizedDirectory, suppressedExceptions)); if (suppressedExceptions.size() > 0) { for (IOException e : suppressedExceptions) { Log.w(TAG, "Exception in makeDexElement", e); } Field suppressedExceptionsField = findField(loader, "dexElementsSuppressedExceptions"); IOException[] dexElementsSuppressedExceptions = (IOException[]) suppressedExceptionsField.get(loader); 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(loader, dexElementsSuppressedExceptions); } } /** * A wrapper around * {@code private static final dalvik.system.DexPathList#makeDexElements}. */ private static Object[] makeDexElements( Object dexPathList, ArrayList<File> files, File optimizedDirectory, ArrayList<IOException> 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 static void install(ClassLoader loader, List<File> additionalClassPathEntries, File optimizedDirectory) throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, InvocationTargetException, NoSuchMethodException { /* 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); expandFieldArray(dexPathList, "dexElements", makeDexElements(dexPathList, new ArrayList<File>(additionalClassPathEntries), optimizedDirectory)); } /** * A wrapper around * {@code private static final dalvik.system.DexPathList#makeDexElements}. */ private static Object[] makeDexElements( Object dexPathList, ArrayList<File> files, File optimizedDirectory) throws IllegalAccessException, InvocationTargetException, NoSuchMethodException { Method makeDexElements = findMethod(dexPathList, "makeDexElements", ArrayList.class, File.class); return (Object[]) makeDexElements.invoke(dexPathList, files, optimizedDirectory); } } /** * Installer for platform versions 4 to 13. */ private static final class V4 { private static void install(ClassLoader loader, List<File> 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<File> 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); } }}MultiDexApplication类：
/* * Copyright (C) 2014 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 com.wisdozzh.android65535;import android.app.Application;import android.content.Context;/** * Minimal MultiDex capable application. To use the legacy multidex library there is 3 possibility: * <ul> * <li>Declare this class as the application in your AndroidManifest.xml.</li> * <li>Have your {@link Application} extends this class.</li> * <li>Have your {@link Application} override attachBaseContext starting with<br> * <code> protected void attachBaseContext(Context base) {<br> super.attachBaseContext(base);<br> MultiDex.install(this); </code></li> * <ul> */public class MultiDexApplication extends Application { @Override protected void attachBaseContext(Context base) { super.attachBaseContext(base); MultiDex.install(this); }}MultiDexExtractor类：/* * 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 com.wisdozzh.android65535;import android.content.Context;import android.content.SharedPreferences;import android.content.pm.ApplicationInfo;import android.os.Build;import android.util.Log;import java.io.BufferedOutputStream;import java.io.Closeable;import java.io.File;import java.io.FileFilter;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.util.ArrayList;import java.util.List;import java.util.zip.ZipEntry;import java.util.zip.ZipException;import java.util.zip.ZipFile;import java.util.zip.ZipOutputStream;/** * Exposes application secondary dex files as files in the application data * directory. */final class MultiDexExtractor { private static final String TAG = MultiDex.TAG; /** * We look for additional dex files named {@code classes2.dex}, * {@code classes3.dex}, etc. */ private static final String DEX_PREFIX = "classes"; private static final String DEX_SUFFIX = ".dex"; private static final String EXTRACTED_NAME_EXT = ".classes"; private static final String EXTRACTED_SUFFIX = ".zip"; private static final int MAX_EXTRACT_ATTEMPTS = 3; private static final String PREFS_FILE = "multidex.version"; private static final String KEY_TIME_STAMP = "timestamp"; private static final String KEY_CRC = "crc"; private static final String KEY_DEX_NUMBER = "dex.number"; /** * Size of reading buffers. */ private static final int BUFFER_SIZE = 0x4000; /* Keep value away from 0 because it is a too probable time stamp value */ private static final long NO_VALUE = -1L; /** * Extracts application secondary dexes into files in the application data * directory. * * @return a list of files that were created. The list may be empty if there * are no secondary dex files. * @throws IOException if encounters a problem while reading or writing * secondary dex files */ static List<File> load(Context context, ApplicationInfo applicationInfo, File dexDir, boolean forceReload) throws IOException { Log.i(TAG, "MultiDexExtractor.load(" + applicationInfo.sourceDir + ", " + forceReload + ")"); final File sourceApk = new File(applicationInfo.sourceDir); long currentCrc = getZipCrc(sourceApk); List<File> files; if (!forceReload && !isModified(context, sourceApk, currentCrc)) { try { files = loadExistingExtractions(context, sourceApk, dexDir); } catch (IOException ioe) { Log.w(TAG, "Failed to reload existing extracted secondary dex files," + " falling back to fresh extraction", ioe); files = performExtractions(sourceApk, dexDir); putStoredApkInfo(context, getTimeStamp(sourceApk), currentCrc, files.size() + 1); } } else { Log.i(TAG, "Detected that extraction must be performed."); files = performExtractions(sourceApk, dexDir); putStoredApkInfo(context, getTimeStamp(sourceApk), currentCrc, files.size() + 1); } Log.i(TAG, "load found " + files.size() + " secondary dex files"); return files; } private static List<File> loadExistingExtractions(Context context, File sourceApk, File dexDir) throws IOException { Log.i(TAG, "loading existing secondary dex files"); final String extractedFilePrefix = sourceApk.getName() + EXTRACTED_NAME_EXT; int totalDexNumber = getMultiDexPreferences(context).getInt(KEY_DEX_NUMBER, 1); final List<File> files = new ArrayList<File>(totalDexNumber); for (int secondaryNumber = 2; secondaryNumber <= totalDexNumber; secondaryNumber++) { String fileName = extractedFilePrefix + secondaryNumber + EXTRACTED_SUFFIX; File extractedFile = new File(dexDir, fileName); if (extractedFile.isFile()) { files.add(extractedFile); if (!verifyZipFile(extractedFile)) { Log.i(TAG, "Invalid zip file: " + extractedFile); throw new IOException("Invalid ZIP file."); } } else { throw new IOException("Missing extracted secondary dex file '" + extractedFile.getPath() + "'"); } } return files; } private static boolean isModified(Context context, File archive, long currentCrc) { SharedPreferences prefs = getMultiDexPreferences(context); return (prefs.getLong(KEY_TIME_STAMP, NO_VALUE) != getTimeStamp(archive)) || (prefs.getLong(KEY_CRC, NO_VALUE) != currentCrc); } private static long getTimeStamp(File archive) { long timeStamp = archive.lastModified(); if (timeStamp == NO_VALUE) { // never return NO_VALUE timeStamp--; } return timeStamp; } private static long getZipCrc(File archive) throws IOException { long computedValue = ZipUtil.getZipCrc(archive); if (computedValue == NO_VALUE) { // never return NO_VALUE computedValue--; } return computedValue; } private static List<File> performExtractions(File sourceApk, File dexDir) throws IOException { final String extractedFilePrefix = sourceApk.getName() + EXTRACTED_NAME_EXT; // Ensure that whatever deletions happen in prepareDexDir only happen if the zip that // contains a secondary dex file in there is not consistent with the latest apk. Otherwise, // multi-process race conditions can cause a crash loop where one process deletes the zip // while another had created it. prepareDexDir(dexDir, extractedFilePrefix); List<File> files = new ArrayList<File>(); final ZipFile apk = new ZipFile(sourceApk); try { int secondaryNumber = 2; ZipEntry dexFile = apk.getEntry(DEX_PREFIX + secondaryNumber + DEX_SUFFIX); while (dexFile != null) { String fileName = extractedFilePrefix + secondaryNumber + EXTRACTED_SUFFIX; File extractedFile = new File(dexDir, fileName); files.add(extractedFile); Log.i(TAG, "Extraction is needed for file " + extractedFile); int numAttempts = 0; boolean isExtractionSuccessful = false; while (numAttempts < MAX_EXTRACT_ATTEMPTS && !isExtractionSuccessful) { numAttempts++; // Create a zip file (extractedFile) containing only the secondary dex file // (dexFile) from the apk. extract(apk, dexFile, extractedFile, extractedFilePrefix); // Verify that the extracted file is indeed a zip file. isExtractionSuccessful = verifyZipFile(extractedFile); // Log the sha1 of the extracted zip file Log.i(TAG, "Extraction " + (isExtractionSuccessful ? "success" : "failed") + " - length " + extractedFile.getAbsolutePath() + ": " + extractedFile.length()); if (!isExtractionSuccessful) { // Delete the extracted file extractedFile.delete(); if (extractedFile.exists()) { Log.w(TAG, "Failed to delete corrupted secondary dex '" + extractedFile.getPath() + "'"); } } } if (!isExtractionSuccessful) { throw new IOException("Could not create zip file " + extractedFile.getAbsolutePath() + " for secondary dex (" + secondaryNumber + ")"); } secondaryNumber++; dexFile = apk.getEntry(DEX_PREFIX + secondaryNumber + DEX_SUFFIX); } } finally { try { apk.close(); } catch (IOException e) { Log.w(TAG, "Failed to close resource", e); } } return files; } private static void putStoredApkInfo(Context context, long timeStamp, long crc, int totalDexNumber) { SharedPreferences prefs = getMultiDexPreferences(context); SharedPreferences.Editor edit = prefs.edit(); edit.putLong(KEY_TIME_STAMP, timeStamp); edit.putLong(KEY_CRC, crc); /* SharedPreferences.Editor doc says that apply() and commit() "atomically performs the * requested modifications" it should be OK to rely on saving the dex files number (getting * old number value would go along with old crc and time stamp). */ edit.putInt(KEY_DEX_NUMBER, totalDexNumber); apply(edit); } private static SharedPreferences getMultiDexPreferences(Context context) { return context.getSharedPreferences(PREFS_FILE, Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB ? Context.MODE_PRIVATE : Context.MODE_PRIVATE | Context.MODE_MULTI_PROCESS); } /** * This removes any files that do not have the correct prefix. */ private static void prepareDexDir(File dexDir, final String extractedFilePrefix) throws IOException { dexDir.mkdirs(); if (!dexDir.isDirectory()) { throw new IOException("Failed to create dex directory " + dexDir.getPath()); } // Clean possible old files FileFilter filter = new FileFilter() { @Override public boolean accept(File pathname) { return !pathname.getName().startsWith(extractedFilePrefix); } }; File[] files = dexDir.listFiles(filter); 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()); } } } private static void extract(ZipFile apk, ZipEntry dexFile, File extractTo, String extractedFilePrefix) throws IOException, FileNotFoundException { InputStream in = apk.getInputStream(dexFile); ZipOutputStream out = null; File tmp = File.createTempFile(extractedFilePrefix, EXTRACTED_SUFFIX, extractTo.getParentFile()); Log.i(TAG, "Extracting " + tmp.getPath()); try { out = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(tmp))); try { ZipEntry classesDex = new ZipEntry("classes.dex"); // keep zip entry time since it is the criteria used by Dalvik classesDex.setTime(dexFile.getTime()); out.putNextEntry(classesDex); byte[] buffer = new byte[BUFFER_SIZE]; int length = in.read(buffer); while (length != -1) { out.write(buffer, 0, length); length = in.read(buffer); } out.closeEntry(); } finally { out.close(); } Log.i(TAG, "Renaming to " + extractTo.getPath()); if (!tmp.renameTo(extractTo)) { throw new IOException("Failed to rename \"" + tmp.getAbsolutePath() + "\" to \"" + extractTo.getAbsolutePath() + "\""); } } finally { closeQuietly(in); tmp.delete(); // return status ignored } } /** * Returns whether the file is a valid zip file. */ static boolean verifyZipFile(File file) { try { ZipFile zipFile = new ZipFile(file); try { zipFile.close(); return true; } catch (IOException e) { Log.w(TAG, "Failed to close zip file: " + file.getAbsolutePath()); } } catch (ZipException ex) { Log.w(TAG, "File " + file.getAbsolutePath() + " is not a valid zip file.", ex); } catch (IOException ex) { Log.w(TAG, "Got an IOException trying to open zip file: " + file.getAbsolutePath(), ex); } return false; } /** * Closes the given {@code Closeable}. Suppresses any IO exceptions. */ private static void closeQuietly(Closeable closeable) { try { closeable.close(); } catch (IOException e) { Log.w(TAG, "Failed to close resource", e); } } // The following is taken from SharedPreferencesCompat to avoid having a dependency of the // multidex support library on another support library. private static Method sApplyMethod; // final static { try { Class<?> cls = SharedPreferences.Editor.class; sApplyMethod = cls.getMethod("apply"); } catch (NoSuchMethodException unused) { sApplyMethod = null; } } private static void apply(SharedPreferences.Editor editor) { if (sApplyMethod != null) { try { sApplyMethod.invoke(editor); return; } catch (InvocationTargetException unused) { // fall through } catch (IllegalAccessException unused) { // fall through } } editor.commit(); }}ZipUtil类：
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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. *//* Apache Harmony HEADER because the code in this class comes mostly from ZipFile, ZipEntry and * ZipConstants from android libcore. */package com.wisdozzh.android65535;import java.io.File;import java.io.IOException;import java.io.RandomAccessFile;import java.util.zip.CRC32;import java.util.zip.ZipException;/** * Tools to build a quick partial crc of zip files. */final class ZipUtil { static class CentralDirectory { long offset; long size; } /* redefine those constant here because of bug 13721174 preventing to compile using the * constants defined in ZipFile */ private static final int ENDHDR = 22; private static final int ENDSIG = 0x6054b50; /** * Size of reading buffers. */ private static final int BUFFER_SIZE = 0x4000; /** * Compute crc32 of the central directory of an apk. The central directory contains * the crc32 of each entries in the zip so the computed result is considered valid for the whole * zip file. Does not support zip64 nor multidisk but it should be OK for now since ZipFile does * not either. */ static long getZipCrc(File apk) throws IOException { RandomAccessFile raf = new RandomAccessFile(apk, "r"); try { CentralDirectory dir = findCentralDirectory(raf); return computeCrcOfCentralDir(raf, dir); } finally { raf.close(); } } /* Package visible for testing */ static CentralDirectory findCentralDirectory(RandomAccessFile raf) throws IOException, ZipException { long scanOffset = raf.length() - ENDHDR; if (scanOffset < 0) { throw new ZipException("File too short to be a zip file: " + raf.length()); } long stopOffset = scanOffset - 0x10000 /* ".ZIP file comment"'s max length */; if (stopOffset < 0) { stopOffset = 0; } int endSig = Integer.reverseBytes(ENDSIG); while (true) { raf.seek(scanOffset); if (raf.readInt() == endSig) { break; } scanOffset--; if (scanOffset < stopOffset) { throw new ZipException("End Of Central Directory signature not found"); } } // Read the End Of Central Directory. ENDHDR includes the signature // bytes, // which we've already read. // Pull out the information we need. raf.skipBytes(2); // diskNumber raf.skipBytes(2); // diskWithCentralDir raf.skipBytes(2); // numEntries raf.skipBytes(2); // totalNumEntries CentralDirectory dir = new CentralDirectory(); dir.size = Integer.reverseBytes(raf.readInt()) & 0xFFFFFFFFL; dir.offset = Integer.reverseBytes(raf.readInt()) & 0xFFFFFFFFL; return dir; } /* Package visible for testing */ static long computeCrcOfCentralDir(RandomAccessFile raf, CentralDirectory dir) throws IOException { CRC32 crc = new CRC32(); long stillToRead = dir.size; raf.seek(dir.offset); int length = (int) Math.min(BUFFER_SIZE, stillToRead); byte[] buffer = new byte[BUFFER_SIZE]; length = raf.read(buffer, 0, length); while (length != -1) { crc.update(buffer, 0, length); stillToRead -= length; if (stillToRead == 0) { break; } length = (int) Math.min(BUFFER_SIZE, stillToRead); length = raf.read(buffer, 0, length); } return crc.getValue(); }}最后千万别忘记：
<application android:name="MultiDexApplication" android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity></application>注意1：如果不把libs下面的jar包删除的话 会报错 
注意2：如果不把classes.dex改名为classes2.dex 会报错 
注意3：使用dx工具 只能讲all.jar 合并成classes.dex 而不能直接合并成classes2.dex
转载于：冒泡的章鱼http://www.cnblogs.com/liemng/p/5982221.html
上述使用到的三个类可以不用 直接使用 android-support-multidex.jar 在API21 之后有的
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