android解决方法数超过65536问题

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随着android应用软件开发的不断发展，应用软件不断扩展，相信作为一个android开发者的你遇见过，或者将来会遇见的一个问题：

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Unable to execute dex: method ID not in[0, 0xffff]: 65536)

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当出现这个错误时说明你本身自己的工程代码中含有的太多的方法，或者你的工程lib文件夹下引用的第三方插件jar包有太多的方法，这两者的方法加起来已经超过了65536这个数目。而谷歌规定单个dex文件中的方法不能超过65536的限制。

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既然要用到ant，首先就要先下载ant和配置ant环境，下载链接地址为：http://ant.apache.org/bindownload.cgi下载好apache-ant-1.9.4-bin.zip包后，解压到指定目录。然后配置环境变量，创建变量名为ANT_HOME，值为ant文件对应的路径，比如我的是ANT_HOME = E:\apache-ant-1.9.4-bin\apache-ant-1.9.4。然后在Path变量的值中追加%ANT_HOME%/bin;%ANT_HOME%/lib。这样ant环境变量就配置好了。

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注：不会配置的，请移步到：https://www.google.com.hk/ ant配置

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在你的android工程目录下新建一个xml文件，内容如下，需要注意的地方是表红色的部分

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<?xml version="1.0" encoding="UTF-8"?>
<project name="custom_rules">
<dirname property="custom_rules.basedir" file="${ant.file.custom_rules}"/>
<path id="pathtool.antlibs">
<pathelement path="${custom_rules.basedir}/pathtool.jar" />
</path>
<taskdef resource="anttasks.properties" classpathref="pathtool.antlibs"/>
<target name="-post-compile">
<!--
libs="libs/" means pack all .jar library into the secondary dex.
if you to pack specific .jar into the secondary dex, change it to
libs="/android-support-v4.jar,/10k-methods.jar"
-->
<pathtool
<span style="color:#ff0000;">libs="/activeandroid.jar,/Android_Location_V1.3.2.jar,/android-support-v4.jar,/android-support-v7-recyclerview.jar,/com.umeng.message.lib_v2.2.0.jar,/google-play-services.jar,/httpmime-4.1.3.jar,/SocialSDK_QQZone_1.jar,/SocialSDK_QQZone_2.jar,/SocialSDK_QQZone_3.jar,/SocialSDK_Sina.jar,/SocialSDK_WeiXin_1.jar,/SocialSDK_WeiXin_2.jar,/umeng_community_push.jar,/umeng_community_sdk_core.jar,/umeng_community_sdk_login.jar,/umeng_community_sdk_ui.jar,/umeng_community_share.jar,/umeng_social_sdk.jar,/universal-image-loader-1.9.4.jar"</span>
refid="project.all.jars.path"
excludeRefid="out.dex.jar.input.ref"
includeRefid="out.dex.jar.assets" />
<mkdir dir="${out.absolute.dir}/libs.apk"/>
<dex executable="${dx}"
output="${out.absolute.dir}/libs.apk/classes.dex"
dexedlibs="${out.absolute.dir}/libs.apk"
nolocals="true"
forceJumbo="false"
disableDexMerger="false">
<path refid="out.dex.jar.assets" />
</dex>
<zip destfile="${out.absolute.dir}/libs-unaligned.apk"
basedir="${out.absolute.dir}/libs.apk"
includes="classes.dex"
update="true"/>
<zipalign
executable="${zipalign}"
input="${out.absolute.dir}/libs-unaligned.apk"
output="${asset.absolute.dir}/libs.apk"
verbose="${verbose}" />
</target>
<target name="-post-package">
<delete file="${asset.absolute.dir}/libs.apk"/>
</target>
<target name="run">
<xpath input="${manifest.abs.file}" expression="/manifest/@package" output="manifest.package" />
<xpath input="${manifest.abs.file}" expression="/manifest/application/activity[intent-filter/action/@android:name="android.intent.action.MAIN" and intent-filter/category/@android:name="android.intent.category.LAUNCHER"]/@android:name"
output="manifest.activity"/>
<echo>component: ${manifest.package}/${manifest.activity}</echo>
<exec executable="${adb}" failonerror="false">
<arg line="${adb.device.arg}" />
<arg value="shell" />
<arg value="am" />
<arg value="force-stop" />
<arg value="${manifest.package}" />
</exec>
<exec executable="${adb}" failonerror="true">
<arg line="${adb.device.arg}" />
<arg value="shell" />
<arg value="am" />
<arg value="start" />
<arg value="-n" />
<arg value="${manifest.package}/${manifest.activity}" />
<arg value="-W" />
</exec>
</target>
<target name="rund">
<xpath input="${manifest.abs.file}" expression="/manifest/@package" output="manifest.package" />
<xpath input="${manifest.abs.file}" expression="/manifest/application/activity[intent-filter/action/@android:name="android.intent.action.MAIN" and intent-filter/category/@android:name="android.intent.category.LAUNCHER"]/@android:name"
output="manifest.activity"/>
<echo>component: ${manifest.package}/${manifest.activity}</echo>
<echo>Debug package ${mainfest.package}. You should prepare your eclipse.</echo>
<echo>Keep your project open, and if you get a red bug icon in DDMS, you</echo>
<echo>should stop and manually debug it once.</echo>
<exec executable="${adb}" failonerror="false">
<arg line="${adb.device.arg}" />
<arg value="shell" />
<arg value="am" />
<arg value="force-stop" />
<arg value="${manifest.package}" />
</exec>
<exec executable="${adb}" failonerror="true">
<arg line="${adb.device.arg}" />
<arg value="shell" />
<arg value="am" />
<arg value="set-debug-app" />
<arg value="${manifest.package}" />
</exec>
<exec executable="${adb}" failonerror="true">
<arg line="${adb.device.arg}" />
<arg value="shell" />
<arg value="am" />
<arg value="start" />
<arg value="-n" />
<arg value="${manifest.package}/${manifest.activity}" />
<arg value="-W" />
<arg value="-D" />
</exec>
</target>
<target name="help">
<!-- displays starts at col 13
|13 80| -->
<echo>Android Ant Build. Available targets:</echo>
<echo> help: Displays this help.</echo>
<echo> clean: Removes output files created by other targets.</echo>
<echo> This calls the same target on all dependent projects.</echo>
<echo> Use 'ant nodeps clean' to only clean the local project</echo>
<echo> debug: Builds the application and signs it with a debug key.</echo>
<echo> The 'nodeps' target can be used to only build the</echo>
<echo> current project and ignore the libraries using:</echo>
<echo> 'ant nodeps debug'</echo>
<echo> release: Builds the application. The generated apk file must be</echo>
<echo> signed before it is published.</echo>
<echo> The 'nodeps' target can be used to only build the</echo>
<echo> current project and ignore the libraries using:</echo>
<echo> 'ant nodeps release'</echo>
<echo> instrument:Builds an instrumented package and signs it with a</echo>
<echo> debug key.</echo>
<echo> test: Runs the tests. Project must be a test project and</echo>
<echo> must have been built. Typical usage would be:</echo>
<echo> ant [emma] debug install test</echo>
<echo> emma: Transiently enables code coverage for subsequent</echo>
<echo> targets.</echo>
<echo> install: Installs the newly build package. Must either be used</echo>
<echo> in conjunction with a build target (debug/release/</echo>
<echo> instrument) or with the proper suffix indicating</echo>
<echo> which package to install (see below).</echo>
<echo> If the application was previously installed, the</echo>
<echo> application is reinstalled if the signature matches.</echo>
<echo> installd: Installs (only) the debug package.</echo>
<echo> installr: Installs (only) the release package.</echo>
<echo> installi: Installs (only) the instrumented package.</echo>
<echo> installt: Installs (only) the test and tested packages (unless</echo>
<echo> nodeps is used as well.</echo>
<echo> uninstall: Uninstalls the application from a running emulator or</echo>
<echo> device. Also uninstall tested package if applicable</echo>
<echo> unless 'nodeps' is used as well.</echo>
<echo></echo>
<echo>Custom targets:</echo>
<echo> run: Run your application.</echo>
<echo> rund: Run and attach to debugger.</echo>
<echo></echo>
<echo>--> Example:</echo>
<echo>--> ant debug install run</echo>
<echo>--> ant rund</echo>
</target>
</project>

红色部分代码需要你自己配置，你要加载的某一部分的jar，这里需要注意，这里面的jar是application类加载的时候去加载这些jar，格式：/***,/*** 里面用到的某些类必须等加载了这一部分的jar后才可以使用，否则会报错。具体举例请看最后的举例。

注：我新建的xml文件名为：custom_rules.xml（build.xml中会用到，这个名字是ant默认的，所以使用这个名字）

在build.xml中你会发现有这一段

然后你还需要拷贝一个jar到你的工程目录下，下载地址：http://download.csdn.net/detail/u010231111/9372883

最后当然是代码咯，这个需要在application中调用，自定义一个application类，在applicition类中的oncreate方法下调用如下方法：

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private void dexTool() {  
  
        File dexDir = new File(getFilesDir(), "dlibs");  
        dexDir.mkdir();  
        File dexFile = new File(dexDir, "libs.apk");  
        File dexOpt = new File(dexDir, "opt");  
        dexOpt.mkdir();  
        try {  
            InputStream ins = getAssets().open("libs.apk");  
            if (dexFile.length() != ins.available()) {  
                FileOutputStream fos = new FileOutputStream(dexFile);  
                byte[] buf = new byte[4096];  
                int l;  
                while ((l = ins.read(buf)) != -1) {  
                    fos.write(buf, 0, l);  
                }  
                fos.close();  
            }  
            ins.close();  
        } catch (Exception e) {  
            throw new RuntimeException(e);  
        }  
  
        ClassLoader cl = getClassLoader();  
        ApplicationInfo ai = getApplicationInfo();  
        String nativeLibraryDir = null;  
        if (Build.VERSION.SDK_INT > 8) {  
            nativeLibraryDir = ai.nativeLibraryDir;  
        } else {  
            nativeLibraryDir = "/data/data/" + ai.packageName + "/lib/";  
        }  
        DexClassLoader dcl = new DexClassLoader(dexFile.getAbsolutePath(),  
                dexOpt.getAbsolutePath(), nativeLibraryDir, cl.getParent());  
  
        try {  
            Field f = ClassLoader.class.getDeclaredField("parent");  
            f.setAccessible(true);  
            f.set(cl, dcl);  
        } catch (Exception e) {  
            throw new RuntimeException(e);  
        }  
    }  

到这里，算是完事了，最后只需要ant编译即可

编译命令：先进入到你的工程所在目录 cd xxx会吧？

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android update project -p 工程名  
ant clean debug install run  

最后解释一下上面的custom_rules.xml文件红色部分

例如：我有一个类，在其中的某一个jar包里面，但是在application中在dexTool方法调用之前需要使用到，我又把这个jar放到这里去加载的话，那么就会报空指针异常，这个需要时刻谨记，某些jar不会立刻用到的才能放到这里来，否则编译通过了就直接报空指针了！！！

如图片所示：DemoHXSDKHelper 需要开始的时候就使用，如果我把这个包含这个类的jar放到custom_rules.xml中后，那么就会报空指针异常了。因为我要使用这个类点时候，这些个jar还没加载，肯定是找不到这个类的。编译的时候是不会有问题的！！！

一定要注意custom_rules.xml中红色的部分！！！

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