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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)
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="E:\libs\all" default="makeSuperJar">
<target name="makeSuperJar" description="description">
<jar destfile="all.jar">
<zipfileset src="Android_Location_V1.1.2.jar"/>
<zipfileset src="Android_Map_2.1.4.jar"/>
<zipfileset src="Android_Services_2.1.4.jar"/>
<zipfileset src="commons-net-3.3.jar"/>
<zipfileset src="gson-2.2.1.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。
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=E:\libs\classes.dex E:\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：
1 public class MyApplication extends Application{
2
3 @Override
4 protected void attachBaseContext(Context base) {
5 // TODO Auto-generated method stub
6 super.attachBaseContext(base);
7 MultiDex.install(this);
8
9 }
10 }
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 android.support.multidex;
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 {
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
1 /*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package android.support.multidex;
18
19 import android.app.Application;
20 import android.content.Context;
21
22 /**
23 * Minimal MultiDex capable application. To use the legacy multidex library there is 3 possibility:
24 * <ul>
25 * <li>Declare this class as the application in your AndroidManifest.xml.</li>
26 * <li>Have your {@link Application} extends this class.</li>
27 * <li>Have your {@link Application} override attachBaseContext starting with<br>
28 * <code>
29 protected void attachBaseContext(Context base) {<br>
30 super.attachBaseContext(base);<br>
31 MultiDex.install(this);
32 </code></li>
33 * <ul>
34 */
35 public class MultiDexApplication extends Application {
36 @Override
37 protected void attachBaseContext(Context base) {
38 super.attachBaseContext(base);
39 MultiDex.install(this);
40 }
41 }
MultiDexExtractor类
1 /*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package android.support.multidex;
18
19 import android.content.Context;
20 import android.content.SharedPreferences;
21 import android.content.pm.ApplicationInfo;
22 import android.os.Build;
23 import android.util.Log;
24
25 import java.io.BufferedOutputStream;
26 import java.io.Closeable;
27 import java.io.File;
28 import java.io.FileFilter;
29 import java.io.FileNotFoundException;
30 import java.io.FileOutputStream;
31 import java.io.IOException;
32 import java.io.InputStream;
33 import java.lang.reflect.InvocationTargetException;
34 import java.lang.reflect.Method;
35 import java.util.ArrayList;
36 import java.util.List;
37 import java.util.zip.ZipEntry;
38 import java.util.zip.ZipException;
39 import java.util.zip.ZipFile;
40 import java.util.zip.ZipOutputStream;
41
42 /**
43 * Exposes application secondary dex files as files in the application data
44 * directory.
45 */
46 final class MultiDexExtractor {
47
48 private static final String TAG = MultiDex.TAG;
49
50 /**
51 * We look for additional dex files named {@code classes2.dex},
52 * {@code classes3.dex}, etc.
53 */
54 private static final String DEX_PREFIX = "classes";
55 private static final String DEX_SUFFIX = ".dex";
56
57 private static final String EXTRACTED_NAME_EXT = ".classes";
58 private static final String EXTRACTED_SUFFIX = ".zip";
59 private static final int MAX_EXTRACT_ATTEMPTS = 3;
60
61 private static final String PREFS_FILE = "multidex.version";
62 private static final String KEY_TIME_STAMP = "timestamp";
63 private static final String KEY_CRC = "crc";
64 private static final String KEY_DEX_NUMBER = "dex.number";
65
66 /**
67 * Size of reading buffers.
68 */
69 private static final int BUFFER_SIZE = 0x4000;
70 /* Keep value away from 0 because it is a too probable time stamp value */
71 private static final long NO_VALUE = -1L;
72
73 /**
74 * Extracts application secondary dexes into files in the application data
75 * directory.
76 *
77 * @return a list of files that were created. The list may be empty if there
78 * are no secondary dex files.
79 * @throws IOException if encounters a problem while reading or writing
80 * secondary dex files
81 */
82 static List<File> load(Context context, ApplicationInfo applicationInfo, File dexDir,
83 boolean forceReload) throws IOException {
84 Log.i(TAG, "MultiDexExtractor.load(" + applicationInfo.sourceDir + ", " + forceReload + ")");
85 final File sourceApk = new File(applicationInfo.sourceDir);
86
87 long currentCrc = getZipCrc(sourceApk);
88
89 List<File> files;
90 if (!forceReload && !isModified(context, sourceApk, currentCrc)) {
91 try {
92 files = loadExistingExtractions(context, sourceApk, dexDir);
93 } catch (IOException ioe) {
94 Log.w(TAG, "Failed to reload existing extracted secondary dex files,"
95 + " falling back to fresh extraction", ioe);
96 files = performExtractions(sourceApk, dexDir);
97 putStoredApkInfo(context, getTimeStamp(sourceApk), currentCrc, files.size() + 1);
98
99 }
100 } else {
101 Log.i(TAG, "Detected that extraction must be performed.");
102 files = performExtractions(sourceApk, dexDir);
103 putStoredApkInfo(context, getTimeStamp(sourceApk), currentCrc, files.size() + 1);
104 }
105
106 Log.i(TAG, "load found " + files.size() + " secondary dex files");
107 return files;
108 }
109
110 private static List<File> loadExistingExtractions(Context context, File sourceApk, File dexDir)
111 throws IOException {
112 Log.i(TAG, "loading existing secondary dex files");
113
114 final String extractedFilePrefix = sourceApk.getName() + EXTRACTED_NAME_EXT;
115 int totalDexNumber = getMultiDexPreferences(context).getInt(KEY_DEX_NUMBER, 1);
116 final List<File> files = new ArrayList<File>(totalDexNumber);
117
118 for (int secondaryNumber = 2; secondaryNumber <= totalDexNumber; secondaryNumber++) {
119 String fileName = extractedFilePrefix + secondaryNumber + EXTRACTED_SUFFIX;
120 File extractedFile = new File(dexDir, fileName);
121 if (extractedFile.isFile()) {
122 files.add(extractedFile);
123 if (!verifyZipFile(extractedFile)) {
124 Log.i(TAG, "Invalid zip file: " + extractedFile);
125 throw new IOException("Invalid ZIP file.");
126 }
127 } else {
128 throw new IOException("Missing extracted secondary dex file '" +
129 extractedFile.getPath() + "'");
130 }
131 }
132
133 return files;
134 }
135
136 private static boolean isModified(Context context, File archive, long currentCrc) {
137 SharedPreferences prefs = getMultiDexPreferences(context);
138 return (prefs.getLong(KEY_TIME_STAMP, NO_VALUE) != getTimeStamp(archive))
139 || (prefs.getLong(KEY_CRC, NO_VALUE) != currentCrc);
140 }
141
142 private static long getTimeStamp(File archive) {
143 long timeStamp = archive.lastModified();
144 if (timeStamp == NO_VALUE) {
145 // never return NO_VALUE
146 timeStamp--;
147 }
148 return timeStamp;
149 }
150
151
152 private static long getZipCrc(File archive) throws IOException {
153 long computedValue = ZipUtil.getZipCrc(archive);
154 if (computedValue == NO_VALUE) {
155 // never return NO_VALUE
156 computedValue--;
157 }
158 return computedValue;
159 }
160
161 private static List<File> performExtractions(File sourceApk, File dexDir)
162 throws IOException {
163
164 final String extractedFilePrefix = sourceApk.getName() + EXTRACTED_NAME_EXT;
165
166 // Ensure that whatever deletions happen in prepareDexDir only happen if the zip that
167 // contains a secondary dex file in there is not consistent with the latest apk. Otherwise,
168 // multi-process race conditions can cause a crash loop where one process deletes the zip
169 // while another had created it.
170 prepareDexDir(dexDir, extractedFilePrefix);
171
172 List<File> files = new ArrayList<File>();
173
174 final ZipFile apk = new ZipFile(sourceApk);
175 try {
176
177 int secondaryNumber = 2;
178
179 ZipEntry dexFile = apk.getEntry(DEX_PREFIX + secondaryNumber + DEX_SUFFIX);
180 while (dexFile != null) {
181 String fileName = extractedFilePrefix + secondaryNumber + EXTRACTED_SUFFIX;
182 File extractedFile = new File(dexDir, fileName);
183 files.add(extractedFile);
184
185 Log.i(TAG, "Extraction is needed for file " + extractedFile);
186 int numAttempts = 0;
187 boolean isExtractionSuccessful = false;
188 while (numAttempts < MAX_EXTRACT_ATTEMPTS && !isExtractionSuccessful) {
189 numAttempts++;
190
191 // Create a zip file (extractedFile) containing only the secondary dex file
192 // (dexFile) from the apk.
193 extract(apk, dexFile, extractedFile, extractedFilePrefix);
194
195 // Verify that the extracted file is indeed a zip file.
196 isExtractionSuccessful = verifyZipFile(extractedFile);
197
198 // Log the sha1 of the extracted zip file
199 Log.i(TAG, "Extraction " + (isExtractionSuccessful ? "success" : "failed") +
200 " - length " + extractedFile.getAbsolutePath() + ": " +
201 extractedFile.length());
202 if (!isExtractionSuccessful) {
203 // Delete the extracted file
204 extractedFile.delete();
205 if (extractedFile.exists()) {
206 Log.w(TAG, "Failed to delete corrupted secondary dex '" +
207 extractedFile.getPath() + "'");
208 }
209 }
210 }
211 if (!isExtractionSuccessful) {
212 throw new IOException("Could not create zip file " +
213 extractedFile.getAbsolutePath() + " for secondary dex (" +
214 secondaryNumber + ")");
215 }
216 secondaryNumber++;
217 dexFile = apk.getEntry(DEX_PREFIX + secondaryNumber + DEX_SUFFIX);
218 }
219 } finally {
220 try {
221 apk.close();
222 } catch (IOException e) {
223 Log.w(TAG, "Failed to close resource", e);
224 }
225 }
226
227 return files;
228 }
229
230 private static void putStoredApkInfo(Context context, long timeStamp, long crc,
231 int totalDexNumber) {
232 SharedPreferences prefs = getMultiDexPreferences(context);
233 SharedPreferences.Editor edit = prefs.edit();
234 edit.putLong(KEY_TIME_STAMP, timeStamp);
235 edit.putLong(KEY_CRC, crc);
236 /* SharedPreferences.Editor doc says that apply() and commit() "atomically performs the
237 * requested modifications" it should be OK to rely on saving the dex files number (getting
238 * old number value would go along with old crc and time stamp).
239 */
240 edit.putInt(KEY_DEX_NUMBER, totalDexNumber);
241 apply(edit);
242 }
243
244 private static SharedPreferences getMultiDexPreferences(Context context) {
245 return context.getSharedPreferences(PREFS_FILE,
246 Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB
247 ? Context.MODE_PRIVATE
248 : Context.MODE_PRIVATE | Context.MODE_MULTI_PROCESS);
249 }
250
251 /**
252 * This removes any files that do not have the correct prefix.
253 */
254 private static void prepareDexDir(File dexDir, final String extractedFilePrefix)
255 throws IOException {
256 dexDir.mkdirs();
257 if (!dexDir.isDirectory()) {
258 throw new IOException("Failed to create dex directory " + dexDir.getPath());
259 }
260
261 // Clean possible old files
262 FileFilter filter = new FileFilter() {
263
264 @Override
265 public boolean accept(File pathname) {
266 return !pathname.getName().startsWith(extractedFilePrefix);
267 }
268 };
269 File[] files = dexDir.listFiles(filter);
270 if (files == null) {
271 Log.w(TAG, "Failed to list secondary dex dir content (" + dexDir.getPath() + ").");
272 return;
273 }
274 for (File oldFile : files) {
275 Log.i(TAG, "Trying to delete old file " + oldFile.getPath() + " of size " +
276 oldFile.length());
277 if (!oldFile.delete()) {
278 Log.w(TAG, "Failed to delete old file " + oldFile.getPath());
279 } else {
280 Log.i(TAG, "Deleted old file " + oldFile.getPath());
281 }
282 }
283 }
284
285 private static void extract(ZipFile apk, ZipEntry dexFile, File extractTo,
286 String extractedFilePrefix) throws IOException, FileNotFoundException {
287
288 InputStream in = apk.getInputStream(dexFile);
289 ZipOutputStream out = null;
290 File tmp = File.createTempFile(extractedFilePrefix, EXTRACTED_SUFFIX,
291 extractTo.getParentFile());
292 Log.i(TAG, "Extracting " + tmp.getPath());
293 try {
294 out = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(tmp)));
295 try {
296 ZipEntry classesDex = new ZipEntry("classes.dex");
297 // keep zip entry time since it is the criteria used by Dalvik
298 classesDex.setTime(dexFile.getTime());
299 out.putNextEntry(classesDex);
300
301 byte[] buffer = new byte[BUFFER_SIZE];
302 int length = in.read(buffer);
303 while (length != -1) {
304 out.write(buffer, 0, length);
305 length = in.read(buffer);
306 }
307 out.closeEntry();
308 } finally {
309 out.close();
310 }
311 Log.i(TAG, "Renaming to " + extractTo.getPath());
312 if (!tmp.renameTo(extractTo)) {
313 throw new IOException("Failed to rename \"" + tmp.getAbsolutePath() +
314 "\" to \"" + extractTo.getAbsolutePath() + "\"");
315 }
316 } finally {
317 closeQuietly(in);
318 tmp.delete(); // return status ignored
319 }
320 }
321
322 /**
323 * Returns whether the file is a valid zip file.
324 */
325 static boolean verifyZipFile(File file) {
326 try {
327 ZipFile zipFile = new ZipFile(file);
328 try {
329 zipFile.close();
330 return true;
331 } catch (IOException e) {
332 Log.w(TAG, "Failed to close zip file: " + file.getAbsolutePath());
333 }
334 } catch (ZipException ex) {
335 Log.w(TAG, "File " + file.getAbsolutePath() + " is not a valid zip file.", ex);
336 } catch (IOException ex) {
337 Log.w(TAG, "Got an IOException trying to open zip file: " + file.getAbsolutePath(), ex);
338 }
339 return false;
340 }
341
342 /**
343 * Closes the given {@code Closeable}. Suppresses any IO exceptions.
344 */
345 private static void closeQuietly(Closeable closeable) {
346 try {
347 closeable.close();
348 } catch (IOException e) {
349 Log.w(TAG, "Failed to close resource", e);
350 }
351 }
352
353 // The following is taken from SharedPreferencesCompat to avoid having a dependency of the
354 // multidex support library on another support library.
355 private static Method sApplyMethod; // final
356 static {
357 try {
358 Class<?> cls = SharedPreferences.Editor.class;
359 sApplyMethod = cls.getMethod("apply");
360 } catch (NoSuchMethodException unused) {
361 sApplyMethod = null;
362 }
363 }
364
365 private static void apply(SharedPreferences.Editor editor) {
366 if (sApplyMethod != null) {
367 try {
368 sApplyMethod.invoke(editor);
369 return;
370 } catch (InvocationTargetException unused) {
371 // fall through
372 } catch (IllegalAccessException unused) {
373 // fall through
374 }
375 }
376 editor.commit();
377 }
378 }
ZipUtil类
1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 /* Apache Harmony HEADER because the code in this class comes mostly from ZipFile, ZipEntry and
18 * ZipConstants from android libcore.
19 */
20
21 package android.support.multidex;
22
23 import java.io.File;
24 import java.io.IOException;
25 import java.io.RandomAccessFile;
26 import java.util.zip.CRC32;
27 import java.util.zip.ZipException;
28
29 /**
30 * Tools to build a quick partial crc of zip files.
31 */
32 final class ZipUtil {
33 static class CentralDirectory {
34 long offset;
35 long size;
36 }
37
38 /* redefine those constant here because of bug 13721174 preventing to compile using the
39 * constants defined in ZipFile */
40 private static final int ENDHDR = 22;
41 private static final int ENDSIG = 0x6054b50;
42
43 /**
44 * Size of reading buffers.
45 */
46 private static final int BUFFER_SIZE = 0x4000;
47
48 /**
49 * Compute crc32 of the central directory of an apk. The central directory contains
50 * the crc32 of each entries in the zip so the computed result is considered valid for the whole
51 * zip file. Does not support zip64 nor multidisk but it should be OK for now since ZipFile does
52 * not either.
53 */
54 static long getZipCrc(File apk) throws IOException {
55 RandomAccessFile raf = new RandomAccessFile(apk, "r");
56 try {
57 CentralDirectory dir = findCentralDirectory(raf);
58
59 return computeCrcOfCentralDir(raf, dir);
60 } finally {
61 raf.close();
62 }
63 }
64
65 /* Package visible for testing */
66 static CentralDirectory findCentralDirectory(RandomAccessFile raf) throws IOException,
67 ZipException {
68 long scanOffset = raf.length() - ENDHDR;
69 if (scanOffset < 0) {
70 throw new ZipException("File too short to be a zip file: " + raf.length());
71 }
72
73 long stopOffset = scanOffset - 0x10000 /* ".ZIP file comment"'s max length */;
74 if (stopOffset < 0) {
75 stopOffset = 0;
76 }
77
78 int endSig = Integer.reverseBytes(ENDSIG);
79 while (true) {
80 raf.seek(scanOffset);
81 if (raf.readInt() == endSig) {
82 break;
83 }
84
85 scanOffset--;
86 if (scanOffset < stopOffset) {
87 throw new ZipException("End Of Central Directory signature not found");
88 }
89 }
90 // Read the End Of Central Directory. ENDHDR includes the signature
91 // bytes,
92 // which we've already read.
93
94 // Pull out the information we need.
95 raf.skipBytes(2); // diskNumber
96 raf.skipBytes(2); // diskWithCentralDir
97 raf.skipBytes(2); // numEntries
98 raf.skipBytes(2); // totalNumEntries
99 CentralDirectory dir = new CentralDirectory();
100 dir.size = Integer.reverseBytes(raf.readInt()) & 0xFFFFFFFFL;
101 dir.offset = Integer.reverseBytes(raf.readInt()) & 0xFFFFFFFFL;
102 return dir;
103 }
104
105 /* Package visible for testing */
106 static long computeCrcOfCentralDir(RandomAccessFile raf, CentralDirectory dir)
107 throws IOException {
108 CRC32 crc = new CRC32();
109 long stillToRead = dir.size;
110 raf.seek(dir.offset);
111 int length = (int) Math.min(BUFFER_SIZE, stillToRead);
112 byte[] buffer = new byte[BUFFER_SIZE];
113 length = raf.read(buffer, 0, length);
114 while (length != -1) {
115 crc.update(buffer, 0, length);
116 stillToRead -= length;
117 if (stillToRead == 0) {
118 break;
119 }
120 length = (int) Math.min(BUFFER_SIZE, stillToRead);
121 length = raf.read(buffer, 0, length);
122 }
123 return crc.getValue();
124 }
125 }
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发表于 2021-4-8 14:51:43