Parcelable 类在重新进入应用程序后导致“Unmarshalling unknown type code 33 at offset 172”错误

Question

我已经尝试添加这个

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

到我的 proguard-rules.pro 文件中，如：Proguard causing RuntimeException (Unmarshalling unknown type code) in Parcelable class

这是我实现 parcelable 的类，是否有任何问题可能导致此错误？我是否正确处理了实施？

只有在应用程序运行了很长时间并被操作系统杀死后，我才会收到错误并随后强制关闭（但是，如果我在多任务窗口中滑动，我不会收到错误消息）。

public class WeatherData implements Parcelable{

public Condition condition = new Condition();
public Forecast forecast = new Forecast();
public Location location = new Location();

public WeatherData() {
    //empty
}

public static class Condition {
    public static String currentDescription;
    public static String date;
    public static int currentTemp;
}

public static class Forecast {
    public static List<Integer> tempMin = new ArrayList<>();
    public static List<Integer> tempMax = new ArrayList<>();
    public static List<String> description = new ArrayList<>();
    public static List<Integer> windSpeed = new ArrayList<>();
    public static List<String> dayOfWeek = new ArrayList<>();
    public static List<String> imageURL = new ArrayList<>();
}

public static class Location {
    public static String name;
}

public WeatherData(Parcel in) {
    //empty
}

public static final Creator<WeatherData> CREATOR = new Creator<WeatherData>() {
    @Override
    public WeatherData createFromParcel(Parcel in) {
        return new WeatherData(in);
    }

    @Override
    public WeatherData[] newArray(int size) {
        return new WeatherData[size];
    }
};

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

@Override
public void writeToParcel(Parcel parcel, int i) {
    //location
    parcel.writeString(Location.name);
    //condition
    parcel.writeString(Condition.currentDescription);
    parcel.writeString(Condition.date);
    parcel.writeInt(Condition.currentTemp);
    //forecast
    parcel.writeList(Forecast.tempMin);
    parcel.writeList(Forecast.tempMax);
    parcel.writeList(Forecast.description);
    parcel.writeList(Forecast.windSpeed);
    parcel.writeList(Forecast.dayOfWeek);
    parcel.writeList(Forecast.imageURL);
}

编辑：

这是堆栈跟踪

E/AndroidRuntime: FATAL EXCEPTION: main
                                                                                   Process: com.murraystudio.weatherapp, PID: 14219
                                                                                   java.lang.RuntimeException: Unable to start activity ComponentInfo{com.murraystudio.weatherapp/com.murraystudio.weatherapp.MainActivity}: java.lang.NullPointerException: Attempt to read from field 'com.murraystudio.weatherapp.datamodels.WeatherData$Condition com.murraystudio.weatherapp.datamodels.WeatherData.condition' on a null object reference
                                                                                       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
                                                                                       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
                                                                                       at android.app.ActivityThread.-wrap12(ActivityThread.java)
                                                                                       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
                                                                                       at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                                       at android.os.Looper.loop(Looper.java:154)
                                                                                       at android.app.ActivityThread.main(ActivityThread.java:6119)
                                                                                       at java.lang.reflect.Method.invoke(Native Method)
                                                                                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
                                                                                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
                                                                                    Caused by: java.lang.NullPointerException: Attempt to read from field 'com.murraystudio.weatherapp.datamodels.WeatherData$Condition com.murraystudio.weatherapp.datamodels.WeatherData.condition' on a null object reference
                                                                                       at com.murraystudio.weatherapp.WeatherFragment.updateWeatherUI(WeatherFragment.java:230)
                                                                                       at com.murraystudio.weatherapp.WeatherFragment.onCreateView(WeatherFragment.java:124)
                                                                                       at android.app.Fragment.performCreateView(Fragment.java:2353)
                                                                                       at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:995)
                                                                                       at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1171)
                                                                                       at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1153)
                                                                                       at android.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:2039)
                                                                                       at android.app.FragmentController.dispatchActivityCreated(FragmentController.java:176)
                                                                                       at android.app.Activity.performCreateCommon(Activity.java:6673)
                                                                                       at android.app.Activity.performCreate(Activity.java:6681)
                                                                                       at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
                                                                                       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618)
                                                                                       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726) 
                                                                                       at android.app.ActivityThread.-wrap12(ActivityThread.java) 
                                                                                       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477) 
                                                                                       at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                                       at android.os.Looper.loop(Looper.java:154) 
                                                                                       at android.app.ActivityThread.main(ActivityThread.java:6119) 
                                                                                       at java.lang.reflect.Method.invoke(Native Method) 
                                                                                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
                                                                                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 

Answer 1

你不能打包静态变量。将要包裹的变量转换为非静态变量。

Answer 2

使用 Parcelable 或 Serializable 时，您的 Pojo 类（即 WeatherData）、发送包裹的类和接收包裹的类都应该扩展 Parcelable 或 Serializable。