【发布时间】：2011-09-25 21:29:15
【问题描述】：
我和 Gson 和 ProGuard 玩得很开心。我有一个简单的对象，当我解析 tojson、保存到 sqllite 并从数据库中读回以便将 json 加载回我的对象时，我得到一个 java.lang.classcastexception。如果我不使用 ProGuard，一切正常。
我已验证发送到数据库和从数据库获取的 json 字符串是相同的。当它从 json 转换时不会抛出异常，而是当我尝试访问该对象时。
这是我的简单对象：
public class ScanLog extends ArrayList<SingleFrame>
{
private static final long serialVersionUID = 1L;
public ScanLog()
{
}
}
public final class SingleFrame
{
public int Position;
public int Time;
public Map<Integer,String> MainDataMap;
public Map<Integer,String> DataMap;
public SingleFrame(int position, int time,
Map<Integer,String> mainDataMap, Map<Integer,String> dataMap)
{
this.Position = position;
this.Time = time;
this.MainDataMap = mainDataMap;
this.DataMap = dataMap;
}
}
我的应用程序的所有其他方面都很好，但是 proguard 的某些东西导致了这种情况的发生......我在 proguard.cfg 中尝试了各种 -keep 命令，但我不确定我做的是否正确。
编辑 - 添加 PROGUARD.CFG
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontpreverify
-verbose
-dontshrink
-dontoptimize
-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
-keep public class * extends android.app.backup.BackupAgentHelper
-keep public class * extends android.preference.Preference
-keep public class com.android.vending.licensing.ILicensingService
#keep all classes that might be used in XML layouts
-keep public class * extends android.view.View
-keep public class * extends android.app.Fragment
-keep public class * extends android.support.v4.Fragment
#keep all classes
-keep public class *{
public protected *;
}
#keep all public and protected methods that could be used by java reflection
-keepclassmembernames class * {
public protected <methods>;
}
-keepclasseswithmembernames class * {
native <methods>;
}
-keep public class org.scanner.scanlog.SingleFrame
-keepclassmembers class org.scanner.scanlog.ScanLog {
private <fields>;
public <fields>;
}
-keepclassmembers class org.scanner.scanlog.SingleFrame {
private <fields>;
public <fields>;
}
-keepclasseswithmembernames class * {
public <init>(android.content.Context, android.util.AttributeSet);
}
-keepclasseswithmembernames class * {
public <init>(android.content.Context, android.util.AttributeSet, int);
}
-keepclassmembers enum * {
public static **[] values();
public static ** valueOf(java.lang.String);
}
-keep class * implements android.os.Parcelable {
public static final android.os.Parcelable$Creator *;
}
-dontwarn **CompatHoneycomb
-dontwarn org.htmlcleaner.*
#-keep class android.support.v4.** { *; }
编辑 - 好的，我在我的应用程序中成功设置了 ACRA，非常棒的功能！ 这是堆栈跟踪：
java.lang.ClassCastException: java.lang.Object
at org.scanner.activity.ReaderMainActivity.AdvanceScanLog(SourceFile:1499)
at org.scanner.activity.r.onProgressChanged(SourceFile:271)
at android.widget.SeekBar.onProgressRefresh(SeekBar.java:89)
at android.widget.ProgressBar.doRefreshProgress(ProgressBar.java:507)
at android.widget.ProgressBar.refreshProgress(ProgressBar.java:516)
at android.widget.ProgressBar.setProgress(ProgressBar.java:565)
at android.widget.AbsSeekBar.trackTouchEvent(AbsSeekBar.java:337)
at android.widget.AbsSeekBar.onTouchEvent(AbsSeekBar.java:292)
at android.view.View.dispatchTouchEvent(View.java:3932)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:906)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:906)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:906)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:906)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:906)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:906)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:906)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:906)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:906)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1784)
at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1157)
at android.app.Activity.dispatchTouchEvent(Activity.java:2181)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1759)
at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2336)
at android.view.ViewRoot.handleMessage(ViewRoot.java:1976)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:143)
at android.app.ActivityThread.main(ActivityThread.java:4263)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
at dalvik.system.NativeStart.main(Native Method)
【问题讨论】：
-
确切的错误信息是什么，你在 proguard.cfg 中放了什么？
-
我添加了它。由于我无法调试构建的应用程序，我在所有相关的 catch 块中添加了 toast 消息。我尝试访问从 json 重新创建的对象的 toast 消息是：java.lang.ClassCastException: java.lang.object
-
你使用this proguard 配置。