android - 启用 Proguard 时解码时找不到类

Question

我一直在处理似乎是 Proguard 配置问题。我的应用程序在调试时运行良好，但发布的 apk 在启动第二个 Activity 时给我一个异常。这似乎是在尝试从 Intent 中检索 Parcelable extras 时发生的。

这是堆栈跟踪:

E/Parcel﹕ Class not found when unmarshalling: com.mycompany.model.Task
    java.lang.ClassNotFoundException: com.mycompany.model.Task
            at java.lang.Class.classForName(Native Method)
            at java.lang.Class.forName(Class.java:251)
            at java.lang.Class.forName(Class.java:216)
            at android.os.Parcel.readParcelableCreator(Parcel.java:2133)
            at android.os.Parcel.readParcelable(Parcel.java:2097)
            at android.os.Parcel.readValue(Parcel.java:2013)
            at android.os.Parcel.readArrayMapInternal(Parcel.java:2314)
            at android.os.Bundle.unparcel(Bundle.java:249)
            at android.os.Bundle.getString(Bundle.java:1118)
            at android.content.Intent.getStringExtra(Intent.java:5128)
            at com.android.server.am.ActivityStackSupervisor.startActivityLocked(ActivityStackSupervisor.java:1447)
            at com.android.server.am.ActivityStackSupervisor.startActivityMayWait(ActivityStackSupervisor.java:1043)
            at com.android.server.am.ActivityManagerService.startActivityAsUser(ActivityManagerService.java:4054)
            at com.android.server.am.ActivityManagerService.startActivity(ActivityManagerService.java:3948)
            at android.app.ActivityManagerNative.onTransact(ActivityManagerNative.java:159)
            at com.android.server.am.ActivityManagerService.onTransact(ActivityManagerService.java:2629)
            at android.os.Binder.execTransact(Binder.java:404)
            at dalvik.system.NativeStart.run(Native Method)
Caused by: java.lang.NoClassDefFoundError: com/mycompany/model/Task
            at java.lang.Class.classForName(Native Method)
            at java.lang.Class.forName(Class.java:251)
            at java.lang.Class.forName(Class.java:216)
            at android.os.Parcel.readParcelableCreator(Parcel.java:2133)
            at android.os.Parcel.readParcelable(Parcel.java:2097)
            at android.os.Parcel.readValue(Parcel.java:2013)
            at android.os.Parcel.readArrayMapInternal(Parcel.java:2314)
            at android.os.Bundle.unparcel(Bundle.java:249)
            at android.os.Bundle.getString(Bundle.java:1118)
            at android.content.Intent.getStringExtra(Intent.java:5128)
            at com.android.server.am.ActivityStackSupervisor.startActivityLocked(ActivityStackSupervisor.java:1447)
            at com.android.server.am.ActivityStackSupervisor.startActivityMayWait(ActivityStackSupervisor.java:1043)
            at com.android.server.am.ActivityManagerService.startActivityAsUser(ActivityManagerService.java:4054)
            at com.android.server.am.ActivityManagerService.startActivity(ActivityManagerService.java:3948)
            at android.app.ActivityManagerNative.onTransact(ActivityManagerNative.java:159)
            at com.android.server.am.ActivityManagerService.onTransact(ActivityManagerService.java:2629)
            at android.os.Binder.execTransact(Binder.java:404)
            at dalvik.system.NativeStart.run(Native Method)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.mycompany.model.Task" on path: DexPathList[[directory "."],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
            at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:67)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
            at java.lang.Class.classForName(Native Method)
            at java.lang.Class.forName(Class.java:251)
            at java.lang.Class.forName(Class.java:216)
            at android.os.Parcel.readParcelableCreator(Parcel.java:2133)
            at android.os.Parcel.readParcelable(Parcel.java:2097)
            at android.os.Parcel.readValue(Parcel.java:2013)
            at android.os.Parcel.readArrayMapInternal(Parcel.java:2314)
            at android.os.Bundle.unparcel(Bundle.java:249)
            at android.os.Bundle.getString(Bundle.java:1118)
            at android.content.Intent.getStringExtra(Intent.java:5128)
            at com.android.server.am.ActivityStackSupervisor.startActivityLocked(ActivityStackSupervisor.java:1447)
            at com.android.server.am.ActivityStackSupervisor.startActivityMayWait(ActivityStackSupervisor.java:1043)
            at com.android.server.am.ActivityManagerService.startActivityAsUser(ActivityManagerService.java:4054)
            at com.android.server.am.ActivityManagerService.startActivity(ActivityManagerService.java:3948)
            at android.app.ActivityManagerNative.onTransact(ActivityManagerNative.java:159)
            at com.android.server.am.ActivityManagerService.onTransact(ActivityManagerService.java:2629)
            at android.os.Binder.execTransact(Binder.java:404)
            at dalvik.system.NativeStart.run(Native Method)

有 Parcelable Task 模型:

public class Task implements Parcelable {

    public enum Mode {MODE1, MODE2}

    public enum Type {TYPE1, TYPE2, TYPE3}

    private final String id;
    private final Mode mode;
    private final Type type;
    private ArrayList<Character> charactersList;

    public Task(String id, ArrayList<Character> characters, Mode mode, Type type) {
        this.id = id;
        this.charactersList = characters;
        this.mode = mode;
        this.type = type;
    }

    public Mode getMode() {
        return mode;
    }

    public Type getType() {
        return type;
    }

    public String getId() {
        return id;
    }

    public ArrayList<Character> getCharactersList() {
        return charactersList;
    }

    private Task(Parcel in) {
        id = in.readString();

        Parcelable[] parcelablecharactersArray = in.readParcelableArray(Character.class.getClassLoader());
        charactersList = new ArrayList<>();
        for (Parcelable p : parcelablecharactersArray) {
            charactersList.add((Character) p);
        }

        mode = Mode.valueOf(in.readString());
        type = Type.valueOf(in.readString());

    }

    public static final Parcelable.Creator<Task> CREATOR = new Parcelable.Creator<Task>() {

        public Task createFromParcel(Parcel in) {
            return new Task(in);
        }

        public Task[] newArray(int size) {
            return new Task[size];
        }
    };

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(id);
        dest.writeParcelableArray(charactersList.toArray(new Parcelable[charactersList.size()]), 0);
        dest.writeString(mode.name());
        dest.writeString(type.name());

    }

}

还有启动和接收 Intent 的 Activity :

public class TaskActivity {

    private Task mTask;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setBackgroundDrawable(null);

        Bundle extras = getIntent().getExtras();
        mTask = extras.getParcelable(Constants.TASK_KEY);
    }

    private void launchNextTask(Task nextTask) {
        if (nextTask != null) {
            Intent intent = new Intent(TaskActivity.this, TaskActivity.class);
            intent.putExtra(Constants.TASK_KEY, nextTask);
            startActivity(intent);
        }
    }
}

Proguard 规则:

-keep class android.support.v4.app.** { *; }
-keep interface android.support.v4.app.** { *; }

-keep class * implements android.os.Parcelable {
  public static final android.os.Parcelable$Creator *;
}

-keep public class com.mycompany.model.Task { *; }
-keep public class com.mycompany.model.Character { *; }
-keep public class com.mycompany.Constants { *; }

您知道问题出在哪里吗？我的第一个猜测是尝试在 Parcelable 构造函数中创建 Character ArrayList 时类加载器有问题(顺便说一下，Character 也实现了 Parcelable)。第二个猜测是枚举。

Answer 1

我认为问题出在 Task 扩展的 Parcelable 上。

# could be refined, but if it works you got the idea
-keepnames class * implements android.os.Parcelable { *; }
-keepclassmembers class * implements android.os.Parcelable { *; }
-keep public class com.mycompany.model.Task { *; }