I: Loading resource table... I: Loaded. I: Decoding AndroidManifest.xml with resources... W: Could not decode attr value, using undecoded value instead: ns=android, name=sharedUserId, value=0x0000001a Exception in thread "main" java.lang.NullPointerException: at java.io.Writer.write(Writer.java:157) at brut.androlib.res.util.ExtMXSerializer.writeAttributeValue(ExtMXSerializer.java:38) at org.xmlpull.mxp1_serializer.MXSerializer.attribute(MXSerializer.java:673) at org.xmlpull.v1.wrapper.classic.XmlSerializerDelegate.attribute(XmlSerializerDelegate.java:106) at org.xmlpull.v1.wrapper.classic.StaticXmlSerializerWrapper.writeStartTag(StaticXmlSerializerWrapper.java:267) at org.xmlpull.v1.wrapper.classic.StaticXmlSerializerWrapper.event(StaticXmlSerializerWrapper.java:211) at brut.androlib.res.decoder.XmlPullStreamDecoder$1.event(XmlPullStreamDecoder.java:80) at brut.androlib.res.decoder.XmlPullStreamDecoder.decode(XmlPullStreamDecoder.java:130) at brut.androlib.res.decoder.XmlPullStreamDecoder.decodeManifest(XmlPullStreamDecoder.java:144) at brut.androlib.res.decoder.ResFileDecoder.decodeManifest(ResFileDecoder.java:131) at brut.androlib.res.AndrolibResources.decode(AndrolibResources.java:218) at brut.androlib.Androlib.decodeResourcesFull(Androlib.java:115) at brut.androlib.ApkDecoder.decode(ApkDecoder.java:114) at brut.apktool.Main.cmdDecode(Main.java:146) at brut.apktool.Main.main(Main.java:77) 为什么会这样？