android – 我使用Proguard时的未知来源

如果我使用Proguard(minifyEnabled为true和shrinkResources为true),我的崩溃报告有点无用

这是Proguard的报告：

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ProgressBar.setVisibility(int)' on a null object reference
    at xx.xxxx.xxx.xxxxx.xxxxxx.restoreViewAfterLoading(UnkNown Source)
    at xx.xxxx.xxx.xxxxx.xxxxxx.newInstance(UnkNown Source)
                                                     onCreateView
                                                     onViewCreated
                                                     access$000
    at xx.xxxx.xxx.xxxxx.xxxxxx$1.success(UnkNown Source)
    at xx.xxxx.xxx.xxxxx.xxxxxx$1.success(UnkNown Source)
    at retrofit.CallbackRunnable$1.run(UnkNown Source)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:135)
    at android.app.ActivityThread.main(ActivityThread.java:5254)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

这是没有Proguard的正常报告：

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ProgressBar.setVisibility(int)' on a null object reference
    at xx.xxxx.xxx.xxxxx.xxxxxx.restoreViewAfterLoading(xxxxxx.java:123)
    at xx.xxxx.xxx.xxxxx.xxxxxx.access$000(xxxxxx.java:26)
    at xx.xxxx.xxx.xxxxx.xxxxxx$1.success(xxxxxx.java:96)
    at xx.xxxx.xxx.xxxxx.xxxxxx$1.success(xxxxxx.java:92)
    at retrofit.CallbackRunnable$1.run(CallbackRunnable.java:45)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:135)
    at android.app.ActivityThread.main(ActivityThread.java:5254)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

我能用Proguard来获取行号吗？

解决方法

看起来你在名为restoreViewAfterLoading的方法中的某个文件中有一个NPE,其中在某个文件的第123行的ProgressBar(为空)上调用setVisibility.这一切都发生在改装回调上.所以我的第一个想法是在用户完成此活动/片段的情况下检查null.

要获得更好的行号,请在proguard配置中添加以下内容

# Preserve annotations,line numbers,and source file names
-keepattributes *Annotation*,SourceFile,LineNumberTable

这将保留模糊堆栈跟踪中的行号.

HTHS