我在使用android.what运行proguard时遇到了奇怪的错误。这个错误意味着，有没有办法解决这个问题，
我正在使用ProGuard 4.4版 Android 2.3.1
2011-05-17 17:55:25 - tests] Optimizing...
[2011-05-17 17:55:25 - tests] Proguard returned with error code 1. See console
[2011-05-17 17:55:25 - tests] Unexpected error while evaluating instruction:
[2011-05-17 17:55:25 - tests] Class = [com/test/service/DownloadBarCodeService]
[2011-05-17 17:55:25 - tests] Method = [onHandleIntent(Landroid/content/Intent;)V]
[2011-05-17 17:55:25 - tests] Instruction = [170] iload v14
[2011-05-17 17:55:25 - tests] Exception = [java.lang.NullPointerException] (null)
[2011-05-17 17:55:25 - tests] Unexpected error while performing partial evaluation:
[2011-05-17 17:55:25 - tests] Class = [com/test/service/DownloadBarCodeService]
[2011-05-17 17:55:25 - tests] Method = [onHandleIntent(Landroid/content/Intent;)V]
[2011-05-17 17:55:25 - tests] Exception = [java.lang.NullPointerException] (null)
[2011-05-17 17:55:25 - tests] java.lang.NullPointerException
[2011-05-17 17:55:25 - tests] at proguard.evaluation.Variables.iload(Variables.java:228)
[2011-05-17 17:55:25 - tests] at proguard.evaluation.Processor.visitVariableInstruction(Processor.java:645)
[2011-05-17 17:55:25 - tests] at proguard.classfile.instruction.VariableInstruction.accept(VariableInstruction.java:306)
[2011-05-17 17:55:25 - tests] at proguard.optimize.evaluation.PartialEvaluator.evaluateSingleInstructionBlock(PartialEvaluator.java:729)
[2011-05-17 17:55:25 - tests] at proguard.optimize.evaluation.PartialEvaluator.evaluateInstructionBlock(PartialEvaluator.java:575)
[2011-05-17 17:55:25 - tests] at proguard.optimize.evaluation.PartialEvaluator.evaluateInstructionBlockAndExceptionHandlers(PartialEvaluator.java:533)
[2011-05-17 17:55:25 - tests] at proguard.optimize.evaluation.PartialEvaluator.visitCodeAttribute0(PartialEvaluator.java:221)
[2011-05-17 17:55:25 - tests] at proguard.optimize.evaluation.PartialEvaluator.visitCodeAttribute(PartialEvaluator.java:180)
[2011-05-17 17:55:25 - tests] at proguard.optimize.evaluation.LivenessAnalyzer.visitCodeAttribute(LivenessAnalyzer.java:195)
[2011-05-17 17:55:25 - tests] at proguard.optimize.evaluation.VariableOptimizer.visitCodeAttribute(VariableOptimizer.java:102)
[2011-05-17 17:55:25 - tests] at proguard.classfile.attribute.CodeAttribute.accept(CodeAttribute.java:101)
[2011-05-17 17:55:25 - tests] at proguard.classfile.ProgramMethod.attributesAccept(ProgramMethod.java:79)
[2011-05-17 17:55:25 - tests] at proguard.classfile.attribute.visitor.AllAttributeVisitor.visitProgramMember(AllAttributeVisitor.java:95)
[2011-05-17 17:55:25 - tests] at proguard.classfile.util.SimplifiedVisitor.visitProgramMethod(SimplifiedVisitor.java:91)
[2011-05-17 17:55:25 - tests] at proguard.classfile.ProgramMethod.accept(ProgramMethod.java:71)
[2011-05-17 17:55:25 - tests] at proguard.classfile.ProgramClass.methodsAccept(ProgramClass.java:439)
[2011-05-17 17:55:25 - tests] at proguard.classfile.visitor.AllMethodVisitor.visitProgramClass(AllMethodVisitor.java:47)
[2011-05-17 17:55:25 - tests] at proguard.classfile.ProgramClass.accept(ProgramClass.java:281)
[2011-05-17 17:55:25 - tests] at proguard.classfile.ClassPool.classesAccept(ClassPool.java:114)
[2011-05-17 17:55:25 - tests] at proguard.optimize.Optimizer.execute(Optimizer.java:764)
[2011-05-17 17:55:25 - tests] at proguard.ProGuard.optimize(ProGuard.java:325)
[2011-05-17 17:55:25 - tests] at proguard.ProGuard.execute(ProGuard.java:114)
[2011-05-17 17:55:25 - tests] at proguard.ProGuard.main(ProGuard.java:499)
答案 0 :(得分：4)
我遇到了同样的问题。这是原始代码：
boolean mExternalStorageAvailable = false;
boolean mExternalStorageWriteable = false;
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
// We can read and write the media
mExternalStorageAvailable = true;
mExternalStorageWriteable = true;
} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
// We can only read the media
mExternalStorageAvailable = true;
mExternalStorageWriteable = false;
} else {
// Something else is wrong. It may be one of many other states, but
// all we need to know is we can neither read nor write
mExternalStorageAvailable = false;
mExternalStorageWriteable = false;
}
return (mExternalStorageAvailable && mExternalStorageWriteable);
Proguard最后一行出了问题！我最终得到了两个解决方案。
解决方案＃1：不要在开始时初始化2个布尔变量：
boolean mExternalStorageAvailable;
boolean mExternalStorageWriteable;
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
// We can read and write the media
mExternalStorageAvailable = true;
mExternalStorageWriteable = true;
} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
// We can only read the media
mExternalStorageAvailable = true;
mExternalStorageWriteable = false;
} else {
// Something else is wrong. It may be one of many other states, but
// all we need to know is we can neither read nor write
mExternalStorageAvailable = false;
mExternalStorageWriteable = false;
}
return (mExternalStorageAvailable && mExternalStorageWriteable);
解决方案＃2 返回true / false，而不是设置2个布尔值。
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
// We can read and write the media
return true;
} else {
return false;
}
对于这种情况，这很好（也可能更好），但我很高兴我没有在更复杂的功能中得到这个问题！
答案 1 :(得分：2)
在撰写本文时，最新版本的ProGuard 4.6版本已经解决了这个问题。否则，您可以在Sourceforge上的ProGuard站点上提交错误报告，最好使用一个简单的测试用例来重现问题。
答案 2 :(得分：0)
为了记录，我遇到了同样的问题。你找到了解决方案吗？
修改
我已设法将其归结为下面的两个if语句。如果我注释掉任何一个if语句，Proguard会成功并且不会抛出NullPointerException。
boolean externalStorageAvailable = false;
boolean externalStorageWriteable = false;
...
if (!externalStorageAvailable) {
throw new IOException("External storage is not available");
}
if (!externalStorageWriteable) {
throw new IOException("Could not get write access to external storage");
}
如果我反转和布尔值并将它们分配给新变量，Proguard也会成功。这对我有用。
boolean externalStorageAvailable = false;
boolean externalStorageWriteable = false;
...
boolean notAvailable = !externalStorageAvailable;
boolean notWritable = !externalStorageWriteable;
if (notAvailable) {
throw new IOException("External storage is not available");
}
if (notWritable) {
throw new IOException("Could not get write access to external storage");
}
答案 3 :(得分：0)
与Android SDK一起更新到ProGuard的（beta）版本4.10后面临同样的问题。
未设置初始化布尔变量的解决方案解决了我的proguard异常！
答案 4 :(得分：-3)
将它放在项目的project.properties文件
中proguard.config = / ECLIPSE / proguard.cfg中的PROJECT NAME