Android-主dex超过限制的解决方案-Too manyclasses in --main-dex-list, main dex capacity exceeded
问题描述：
由于工程不断的版本迭代，工程中的类太多，虽然经过了分多个dex的处理（分多个dex的方法我就不说了，百度一大堆），在不断加入更多的类之后，主dex的类超过了限制。
具体报错：
com.android.dex.DexException: Too manyclasses in --main-dex-list, main dex capacity exceeded
atcom.android.dx.command.dexer.Main.processAllFiles(Main.java:546)
atcom.android.dx.command.dexer.Main.run(Main.java:275)
atcom.android.dx.command.dexer.Main.runMultiDex(Main.java:366)
atcom.android.dx.command.dexer.Main.main(Main.java:245)
atcom.android.dx.command.Main.main(Main.java:106)
Error:Execution failed for task':12580:dexDebug'.
>com.android.ide.common.process.ProcessException:org.gradle.process.internal.ExecException: Process 'command 'C:\ProgramFiles\Java\jdk1.8.0_45\bin\java.exe'' finished with non-zero exit value 2
就不解释产生这个的原因了，主要我还解释不了，哈哈，直接进入解决方案。
解决方案步骤：
1. 修改app的build.gradle中gradle插件的版本：
修改为classpath 'com.android.tools.build:gradle:2.0.0'
2. 修改gradle-wrapper.properties文件中gradle的版本：
修改为gradle-2.10-all.zip
3. 在module的build.gradle文件中添加下面代码：
import java.lang.reflect.Array
import java.lang.reflect.Field
defpatchKeepSpecs() {
def clazz =Class.forName("com.android.build.gradle.internal.tasks.multidex.CreateManifestKeepList")
def keepSpecsField =clazz.getDeclaredField("KEEP_SPECS")
keepSpecsField.setAccessible(true)
def keepSpecs = (Map)keepSpecsField.get(null)
println "\nKEEP_SPECS **before**patch:"
for (def item : keepSpecs) {
if (item) {
println item
}
}
println ''
excludeElement(keepSpecs,"activity")
println "\nKEEP_SPECS **after**patch:"
for (def item : keepSpecs) {
if (item) {
println item
}
}
println ''
}
defexcludeElement(keepSpecs, element) {
Class mapClazz =Class.forName("com.google.common.collect.RegularImmutableMap")
Field tableField = mapClazz.getDeclaredField("table")
tableField.setAccessible(true)
def table = tableField.get(keepSpecs)
def index = getElementIndex(table, element)
if (index == -1) {
println "KEEP_SPECS (table): no'$element' found"
} else {
Array.set(table, index, null)
println "KEEP_SPECS (table)patched: removed '$element' root"
}
def entriesField =mapClazz.getDeclaredField("entries")
entriesField.setAccessible(true)
def entries = entriesField.get(keepSpecs)
index = getElementIndex(entries, element)
if (index == -1) {
println "KEEP_SPECS (entries): no'$element' found"
} else {
Array.set(entries, index, null)
println "KEEP_SPECS (entries)patched: removed '$element' root"
}
}
defgetElementIndex(container, element) {
int length = Array.getLength(container)
for (int i=0; i < length; ++i) {
def entry = Array.get(container, i)
if (entry != null) {
if (element.equals(entry.getKey())){
return i
}
}
}
return -1
}
patchKeepSpecs()
4. 重新编译运行即可。