文章目录
一、将混淆后的报错信息转为原始报错信息
二、retrace.bat 命令执行目录
三、暴露更少信息
更多 ProGuard 混淆配置参考 : https://www.guardsquare.com/en/products/proguard/manual/usage
一、将混淆后的报错信息转为原始报错信息
前提 : proguard-rules.pro 混淆配置中配置保留行数 ;
# 保留行数 -keepattributes SourceFile,LineNumberTable
混淆后的报错信息 :
2020-11-10 12:01:59.426 28142-28142/? E/AndroidRuntime: FATAL EXCEPTION: main Process: kim.hsl.handler, PID: 28142 java.lang.RuntimeException: Unable to start activity ComponentInfo{kim.hsl.handler/kim.hsl.handler.MainActivity}: java.lang.NullPointerException: Attempt to read from field 'b.a.a.d b.a.a.b.a' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3897) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4076) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:91) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:149) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:103) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2473) at android.os.Handler.dispatchMessage(Handler.java:110) at android.os.Looper.loop(Looper.java:219) at android.app.ActivityThread.main(ActivityThread.java:8349) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1055) Caused by: java.lang.NullPointerException: Attempt to read from field 'b.a.a.d b.a.a.b.a' on a null object reference at b.a.a.a.<init>(Handler.java:30) at kim.hsl.handler.MainActivity.onCreate(MainActivity.kt:24) at android.app.Activity.performCreate(Activity.java:8085) at android.app.Activity.performCreate(Activity.java:8073) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1320) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3870) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4076) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:91) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:149) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:103) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2473) at android.os.Handler.dispatchMessage(Handler.java:110) at android.os.Looper.loop(Looper.java:219) at android.app.ActivityThread.main(ActivityThread.java:8349) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1055)
将上述混淆后的报错信息 , 保存到 bug.txt 文件中 , 放在 app\build\outputs\mapping\debug 目录里 ;
在 Sdk\tools\proguard\bin 中找到 retrace.bat 工具 ;
使用上述 retrace.bat 命令 , 通过 Proguard 混淆映射文件 mapping.txt , 还原被混淆过的 报错信息 ;
进入 D:\001_Programs\001_Android\002_Sdk\Sdk\tools\proguard\lib 目录 , 然后在该目录执行上述命令 ;
D:\001_Programs\001_Android\002_Sdk\Sdk\tools\proguard\bin\retrace.bat -verbose D:\002_Project\002_Android_Learn\Handler\app\build\outputs\mapping\debug\mapping.txt D:\002_Project\002_Android_Learn\Handler\app\build\outputs\mapping\debug\bug.txt
一定要注意 , 必须在 D:\001_Programs\001_Android\002_Sdk\Sdk\tools\proguard\lib 目录中执行该命令 ;
还原结果 :
D:\001_Programs\001_Android\002_Sdk\Sdk\tools\proguard\lib>D:\001_Programs\001_Android\002_Sdk\Sdk\tools\proguard\bin\retrace.bat -verbose D:\002_Project\002_Android_Learn\Handler\app\build\outputs\mapping\debug\mapping.txt D:\002_Project\002_Android_Learn\Handler\app\build\outputs\mapping\debug\bug.txt 2020-11-10 12:01:59.426 28142-28142/? E/AndroidRuntime: FATAL EXCEPTION: main Process: kim.hsl.handler, PID: 28142 java.lang.RuntimeException: Unable to start activity ComponentInfo{kim.hsl.handler/kim.hsl.handler.MainActivity}: java.lang.NullPointerException: Attempt to read from field 'b.a.a.d b.a.a.b.a' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3897) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4076) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:91) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:149) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:103) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2473) at android.os.Handler.dispatchMessage(Handler.java:110) at android.os.Looper.loop(Looper.java:219) at android.app.ActivityThread.main(ActivityThread.java:8349) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1055) Caused by: java.lang.NullPointerException: Attempt to read from field 'b.a.a.d b.a.a.b.a' on a null object reference at kim.hsl.handler.Handler.void <init>()(Handler.java:30) at kim.hsl.handler.MainActivity.void onCreate(android.os.Bundle)(MainActivity.kt:24) at android.app.Activity.performCreate(Activity.java:8085) at android.app.Activity.performCreate(Activity.java:8073) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1320) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3870) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4076)聽 at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:91)聽 at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:149)聽 at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:103)聽 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2473)聽 at android.os.Handler.dispatchMessage(Handler.java:110)聽 at android.os.Looper.loop(Looper.java:219)聽 at android.app.ActivityThread.main(ActivityThread.java:8349)聽 at java.lang.reflect.Method.invoke(Native Method)聽 at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)聽 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1055)聽 D:\001_Programs\001_Android\002_Sdk\Sdk\tools\proguard\lib>
