UNEXPECTED TOP-LEVEL EXCEPTION异常

昨晚中秋加班，在Android 5.1项目编译的时候突然报了UNEXPECTED TOP-LEVEL EXCEPTION异常。先看看异常信息：

UNEXPECTED TOP-LEVEL EXCEPTION:
com.android.dex.util.ExceptionWithContext
	at com.android.dex.util.ExceptionWithContext.withContext(ExceptionWithContext.java:45)
	at com.android.dx.dex.cf.CfTranslator.processMethods(CfTranslator.java:369)
	at com.android.dx.dex.cf.CfTranslator.translate0(CfTranslator.java:137)
	at com.android.dx.dex.cf.CfTranslator.translate(CfTranslator.java:93)
	at com.android.dx.command.dexer.Main.processClass(Main.java:729)
	at com.android.dx.command.dexer.Main.processFileBytes(Main.java:673)
	at com.android.dx.command.dexer.Main.access$300(Main.java:83)
	at com.android.dx.command.dexer.Main$1.processFileBytes(Main.java:602)
	at com.android.dx.cf.direct.ClassPathOpener.processArchive(ClassPathOpener.java:284)
	at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:166)
	at com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:144)
	at com.android.dx.command.dexer.Main.processOne(Main.java:632)
	at com.android.dx.command.dexer.Main.processAllFiles(Main.java:510)
	at com.android.dx.command.dexer.Main.runMonoDex(Main.java:280)
	at com.android.dx.command.dexer.Main.run(Main.java:246)
	at com.android.dx.command.dexer.Main.main(Main.java:215)
	at com.android.dx.command.Main.main(Main.java:106)
Caused by: java.lang.NullPointerException
	at com.android.dx.cf.code.ConcreteMethod.(ConcreteMethod.java:87)
	at com.android.dx.cf.code.ConcreteMethod.(ConcreteMethod.java:75)
	at com.android.dx.dex.cf.CfTranslator.processMethods(CfTranslator.java:271)
	... 15 more
...while processing  (Lcom/android/server/BatteryService;)V
...while processing com/android/server/BatteryService$1.class

1 error; aborting
make: *** [out/target/common/obj/JAVA_LIBRARIES/services_intermediates/with-local/classes.dex] Error 1
make: *** Waiting for unfinished jobs....

恰好在编译之前刚刚修改过BatteryService文件，显然这个错误是由修改引起的。可是找了半天都不知道什么原因。

        也查看了网上，有人说是引用的jar包版本不一致导致。对比我的项目显然不是这个问题。最后纠结了好久之后才发现，原来我在修改BatteryService文件时，在其内部类中添加了一个新的方法，而在BatteryService中切没有位置去调用（调用的位置用宏去掉了）。直接去掉该方法或者在BatteryService中手动调用该方法之后项目就编译通过了。