android解决方法数超过65536问题

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：

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

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。

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。

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

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

<?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：

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？

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！！！