当我在手机上安装我的应用程序时，出现异常。它无需 proguard 即可工作。我的配置有什么问题？非常感谢！该配置是我在某处找到的默认 Android 配置。不知道发生了什么事

D/AndroidRuntime(15388): Shutting down VM
W/dalvikvm(15388): threadid=1: thread exiting with uncaught exception (group=0x40c3a1f8)
E/AndroidRuntime(15388): FATAL EXCEPTION: main
E/AndroidRuntime(15388): java.lang.NullPointerException
E/AndroidRuntime(15388): at aV.setViewValue(SourceFile:163)
E/AndroidRuntime(15388): at android.widget.SimpleAdapter.bindView(SimpleAdapter.java:168)
E/AndroidRuntime(15388): at android.widget.SimpleAdapter.createViewFromResource(SimpleAdapter.java:126)
E/AndroidRuntime(15388): at android.widget.SimpleAdapter.getView(SimpleAdapter.java:114)
E/AndroidRuntime(15388): at android.widget.AbsListView.obtainView(AbsListView.java:2214)
E/AndroidRuntime(15388): at android.widget.ListView.makeAndAddView(ListView.java:1774)
E/AndroidRuntime(15388): at android.widget.ListView.fillDown(ListView.java:672)
E/AndroidRuntime(15388): at android.widget.ListView.fillFromTop(ListView.java:732)
E/AndroidRuntime(15388): at android.widget.ListView.layoutChildren(ListView.java:1625)
E/AndroidRuntime(15388): at android.widget.AbsListView.onLayout(AbsListView.java:2044)
E/AndroidRuntime(15388): at android.view.View.layout(View.java:11418)
E/AndroidRuntime(15388): at android.view.ViewGroup.layout(ViewGroup.java:4224)
E/AndroidRuntime(15388): at android.widget.FrameLayout.onLayout(FrameLayout.java:431)
E/AndroidRuntime(15388): at android.view.View.layout(View.java:11418)
E/AndroidRuntime(15388): at android.view.ViewGroup.layout(ViewGroup.java:4224)
E/AndroidRuntime(15388): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1628)
E/AndroidRuntime(15388): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1486)
E/AndroidRuntime(15388): at android.widget.LinearLayout.onLayout(LinearLayout.java:1399)
E/AndroidRuntime(15388): at android.view.View.layout(View.java:11418)
E/AndroidRuntime(15388): at android.view.ViewGroup.layout(ViewGroup.java:4224)
E/AndroidRuntime(15388): at android.widget.FrameLayout.onLayout(FrameLayout.java:431)
E/AndroidRuntime(15388): at android.view.View.layout(View.java:11418)
E/AndroidRuntime(15388): at android.view.ViewGroup.layout(ViewGroup.java:4224)
E/AndroidRuntime(15388): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1628)
E/AndroidRuntime(15388): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2585)
E/AndroidRuntime(15388): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(15388): at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime(15388): at android.app.ActivityThread.main(ActivityThread.java:4507)
E/AndroidRuntime(15388): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(15388): at java.lang.reflect.Method.invoke(Method.java:511)
E/AndroidRuntime(15388): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
E/AndroidRuntime(15388): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
E/AndroidRuntime(15388): at dalvik.system.NativeStart.main(Native Method)

这是我的混淆器配置

-injars      bin/classes
-injars      libs
-outjars     bin/classes-processed.jar

-libraryjars /libs/android-support-v13.jar



#
# This ProGuard configuration file illustrates how to process Android
# applications.
# Usage:
#     java -jar proguard.jar @android.pro
#
# If you're using the Android SDK (version 2.3 or higher), the android tool
# already creates a file like this in your project, called proguard.cfg.
# It should contain the settings of this file, minus the input and output paths
# (-injars, -outjars, -libraryjars, -printmapping, and -printseeds).
# The generated Ant build file automatically sets these paths.

# Specify the input jars, output jars, and library jars.
# Note that ProGuard works with Java bytecode (.class),
# before the dex compiler converts it into Dalvik code (.dex).



    # Save the obfuscation mapping to a file, so you can de-obfuscate any stack
    # traces later on.

    -printmapping bin/classes-processed.map

    # You can print out the seeds that are matching the keep options below.

    #-printseeds bin/classes-processed.seeds

    # Preverification is irrelevant for the dex compiler and the Dalvik VM.

    -dontpreverify

    # Reduce the size of the output some more.

    -repackageclasses ''
    -allowaccessmodification

    # Switch off some optimizations that trip older versions of the Dalvik VM.

    -optimizations !code/simplification/arithmetic

    # Keep a fixed source file attribute and all line number tables to get line
    # numbers in the stack traces.
    # You can comment this out if you're not interested in stack traces.

    -renamesourcefileattribute SourceFile
    -keepattributes SourceFile,LineNumberTable

    # RemoteViews might need annotations.

    -keepattributes *Annotation*

    # Preserve all fundamental application classes.

    -keep public class * extends android.app.Activity
    -keep public class * extends android.app.Application
    -keep public class * extends android.app.Service
    -keep public class * extends android.content.BroadcastReceiver
    -keep public class * extends android.content.ContentProvider

    # Preserve all View implementations, their special context constructors, and
    # their setters.

    -keep public class * extends android.view.View {
        public <init>(android.content.Context);
        public <init>(android.content.Context, android.util.AttributeSet);
        public <init>(android.content.Context, android.util.AttributeSet, int);
        public void set*(...);
    }

    # Preserve all classes that have special context constructors, and the
    # constructors themselves.

    -keepclasseswithmembers class * {
        public <init>(android.content.Context, android.util.AttributeSet);
    }

    # Preserve all classes that have special context constructors, and the
    # constructors themselves.

    -keepclasseswithmembers class * {
        public <init>(android.content.Context, android.util.AttributeSet, int);
    }

    # Preserve the special fields of all Parcelable implementations.

    -keepclassmembers class * implements android.os.Parcelable {
        static android.os.Parcelable$Creator CREATOR;
    }

    # Preserve static fields of inner classes of R classes that might be accessed
    # through introspection.

    -keepclassmembers class **.R$* {
      public static <fields>;
    }

    # Preserve the required interface from the License Verification Library
    # (but don't nag the developer if the library is not used at all).

    #-keep public interface com.android.vending.licensing.ILicensingService

    #-dontnote com.android.vending.licensing.ILicensingService

    # The Android Compatibility library references some classes that may not be
    # present in all versions of the API, but we know that's ok.

    -dontwarn android.support.**

    # Preserve all native method names and the names of their classes.

    -keepclasseswithmembernames class * {
        native <methods>;
    }

    # Preserve the special static methods that are required in all enumeration
    # classes.

    -keepclassmembers class * extends java.lang.Enum {
        public static **[] values();
        public static ** valueOf(java.lang.String);
    }

    # Explicitly preserve all serialization members. The Serializable interface
    # is only a marker interface, so it wouldn't save them.
    # You can comment this out if your application doesn't use serialization.
    # If your code contains serializable classes that have to be backward 
    # compatible, please refer to the manual.

    #-keepclassmembers class * implements java.io.Serializable {
    #    static final long serialVersionUID;
    #    static final java.io.ObjectStreamField[] serialPersistentFields;
    #    private void writeObject(java.io.ObjectOutputStream);
    #    private void readObject(java.io.ObjectInputStream);
    #    java.lang.Object writeReplace();
    #    java.lang.Object readResolve();
    #}

    # Your application may contain more items that need to be preserved; 
    # typically classes that are dynamically created using Class.forName:

    # -keep public class mypackage.MyClass
    # -keep public interface mypackage.MyInterface
    # -keep public class * implements mypackage.MyInterface

    # Needed by google-api-client to keep generic types and @Key annotations accessed via reflection
    -keepclassmembers class * {
      @com.google.api.client.util.Key <fields>;
    }

    -keepattributes Signature,RuntimeVisibleAnnotations,AnnotationDefault,*Annotation*

    -dontwarn sun.misc.Unsafe





    -keepattributes 
    -dontoptimize


    #-dontshrink 

设置场景

我目前有完全相同的问题。我有一个带有布局充气机的自定义适配器的完美工作代码，使用以下格式parent and false作为第二个和第三个参数。

由于代码运行良好，没有混淆，我有足够的信心忽略 stackoverflow 上有关的所有问题和回复null由于错误使用 Android API 而返回视图。

如果您也遇到了没有混淆的问题，请忽略此答案和问题并继续！检查这些问题 https://stackoverflow.com/questions/10204262/nullpointerexception-in-custom-adapter-getview

我将尽力在这个答案中报告我的发现。这个答案可能会随着时间的推移而增长。跳到底部的结论如果您渴望了解最新消息。

快速而肮脏的解决方案

这里直接的解决方案是更新您的混淆器配置，以排除您的代码在混淆后失败的类。

在你的 proguard 配置文件中应该是这样的：

-keep class * extends your.company.secret.package

有关 proguard 的更多信息请开始查看此处 http://developer.android.com/tools/help/proguard.html。还要确保您至少拥有 Android 项目所需的最低限度的 proguard 配置文件。检查这个例子 http://code.google.com/p/google-gson/source/browse/trunk/examples/android-proguard-example/proguard.cfg.

映射回您的源代码

在研究这个问题时，您可能会对混淆之前该类的原始名称感兴趣。这应该会让事情变得容易得多。您可以在项目的 bin 文件夹中的 mapping.txt 文件的 proguard 文件夹中找到此映射。

/bin/proguard/mapping.txt

固定到以下代码行

就我而言，我能够确定以下代码行的错误。这些行仅出现在发生故障的适配器中，而其他代码在工作适配器中是常见的。以下所有代码都是getView(final int position, View convertView, final ViewGroup parent):View method

holder.layout.removeAllViews();
TextView tView;
for (final String text : mItems.getTextList()) {
    tView = new TextView(mContext);
    tView.setTextSize(14);
    tView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
    tView.setText(text);
    holder.layout.addView(tView);
}

如果我只是删除addView() and removeAllViews()打电话比一切顺利。

安卓源代码

我的第一个想法是检查该行代码的源代码。我在堆栈跟踪中找到了以下点。

11-20 14:19:40.709: E/AndroidRuntime(22236): FATAL EXCEPTION: main
11-20 14:19:40.709: E/AndroidRuntime(22236): Process: your.company.secret.package, PID: 22236
11-20 14:19:40.709: E/AndroidRuntime(22236): java.lang.NullPointerException
11-20 14:19:40.709: E/AndroidRuntime(22236):    at android.widget.AbsListView.obtainView(AbsListView.java:2265)

The AbsListView 的源代码可以在 grepcode 上找到 http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/4.3_r2.1/android/widget/AbsListView.java#AbsListView.obtainView%28int,boolean%5B%5D%29然而，查看该代码并没有给我很大的勇气在那里找到解决方案。相反，我转向了其他资源。可能稍后会回到这个话题。

我在 Android 4.4 设备上执行此代码，因此行号甚至不匹配。

在 4.3 设备上测试

正确的代码行是 2177。与此行匹配：

child = mAdapter.getView(position, null, this);

示例项目

See https://github.com/hanscappelle/so-10822397 https://github.com/hanscappelle/so-10822397对于示例项目。您需要 Android Studio（Beta）0.8.2 和最新的构建工具。我还必须手动获取 proguard-android.txt 文件并将其放置到位。

您可以注释掉适配器中作用于静态 ViewHolder 类的布局字段的行。一旦启用 proguard 并且应用程序在设备上运行，这些就会失败。

我接下来计划做的事情

• （完成）我的代码中还有其他适配器，即使在混淆后也能正常工作。我会检查这些与失败的差异

• （完成）我真的必须检查 4.3 设备，这样我才能正确查看 Android 源代码。

• （完成）创建示例项目

• TODO 通过示例项目进行完整分析

结论

似乎与动态添加视图有关getView()自定义适配器的方法。与代码混淆相结合。