开发了一个项目,不断加功能,终于遇到了个问题,就是方法数量超过65536个了。这就尴尬了,这个功能有必须要,其他的该删的都删了。从网上找了很多方法,试了感觉不完整,不知道是个人理解不够还是别的原因,反正这次记录一下,以便下次需要,又忘记了。
1、首先得装好ant,这个ant配置安装网上一大把,就过了;
2、然后弄个xml文件,格式如下:
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。这里一定要注意上面的配置文件和要合并的包在同一个目录下,不然会报无法找到project all的错
3、准备条件做好了以后,打开dos,输入ant -buildfile D:libs\b.xml 这时如果成功了就会D盘all目录下就会出现libs.jar包
4、将打好jar包 项目--右键--Build Path --Configure Build Path --- Libraries ---AddExternal JARs导入,删除以前libs下面的包,前提是这些包都在2中xml里有,
5、生成dex文件,先用dos进入到sdk\build-tools\21.0.0目录下,后面的21.0.0是可以不同的,然后输入dx --dex --output=D:\classes.dex D:\all\libs.jar ,这里libs.jar 是3生成的jar包,成功了就会生成classes.dex文件在D盘根目录下,将文件重命名为classes2.dex直接复制到项目src目录即可。
6、OK,这里到执行还差重要的一步了就是导入MutiDex类库,这个网上一大把,这个文章中有这个类库代码,也是我参照的文章http://www.mamicode.com/info-detail-1578920.html。我这里就多此一举了:
MultiDex类
MultiDexApplication类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; 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; /** * 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)}. * *
* 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
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, "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 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 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 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 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 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(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 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 static void install(ClassLoader loader, List 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 (additionalClassPathEntries), optimizedDirectory)); } /** * A wrapper around * {@code private static final dalvik.system.DexPathList#makeDexElements}. */ private static Object[] makeDexElements( Object dexPathList, ArrayList 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 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); } } }
import android.app.Application;
import android.content.Context;
/**
* * Minimal MultiDex capable application. To use the legacy multidex library
* there is 3 possibility: 24 *
*
* *
* - Declare this class as the application in your AndroidManifest.xml.
* *
* - Have your {@link Application} extends this class.
* *
* - Have your {@link Application} override attachBaseContext starting with
* *
protected void attachBaseContext(Context base) {
super.attachBaseContext(base);
MultiDex.install(this);
3 *
*
*/
public class MultiDexApplication extends Application {
@Override
protected void attachBaseContext(Context base) {
super.attachBaseContext(base);
MultiDex.install(this);
}
}
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;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.pm.ApplicationInfo;
import android.os.Build;
import android.util.Log;
/**
* 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 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 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 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 files = new ArrayList(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 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 files = new ArrayList();
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
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();
}
}