Android Studio layout分包
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参考技术A 项目下layout文件越来越多，每次查找起来麻烦，分个包可以快速查找，记录一下分包的方法，免得忘记了。1.找来项目下layout文件夹，按shift+f6(快捷键)，重命名为layouts。
2.在layouts下建立文件夹 activity，item。
3.在activity下建立layout文件夹，item也一样。
4.这个时候，正真的layout文件夹建立完毕，可以在layout文件下建立xml了。
5.在app的build.gradle中的 android 节点中，加入
6.重新编译，ok。
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)
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 Eclipse版本android 65535解决方案(原理等同android studio现在的分包方式)Android Studio 2.3.1中ConstraintLayout下的布局对齐中心