java - 获取 java.lang.RuntimeException : Unmarshalling unknown type code in Activity onRestoreInstanceState

Question

我有一个 Activity，我在其中正确实现了 onSaveInstanceState() 和 onRestoreInstanceState() 以维护 Activity状态。如果我旋转设备，一切都会成功，Activity 状态会保持不变。

当我将应用程序置于后台并使用 Task Killer 将其终止或在设备的开发人员选项中打开“不保留 Activity ”选项时，就会出现问题。在这种情况下，当我重新启动 Activity 时，出现以下异常

09-05 16:04:36.567: E/AndroidRuntime(1976): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.vss.example/com.vss.example.ExampleActivity}: java.lang.RuntimeException: Parcel android.os.Parcel@b389dec8: Unmarshalling unknown type code 6619245 at offset 800
09-05 16:04:36.567: E/AndroidRuntime(1976):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at android.app.ActivityThread.access$600(ActivityThread.java:130)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at android.os.Handler.dispatchMessage(Handler.java:99)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at android.os.Looper.loop(Looper.java:137)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at android.app.ActivityThread.main(ActivityThread.java:4745)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at java.lang.reflect.Method.invokeNative(Native Method)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at java.lang.reflect.Method.invoke(Method.java:511)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at dalvik.system.NativeStart.main(Native Method)
09-05 16:04:36.567: E/AndroidRuntime(1976): Caused by: java.lang.RuntimeException: Parcel android.os.Parcel@b389dec8: Unmarshalling unknown type code 6619245 at offset 800
09-05 16:04:36.567: E/AndroidRuntime(1976):     at android.os.Parcel.readValue(Parcel.java:2032)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at android.os.Parcel.readSparseArrayInternal(Parcel.java:2255)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at android.os.Parcel.readSparseArray(Parcel.java:1687)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at android.os.Parcel.readValue(Parcel.java:2022)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at android.os.Parcel.readMapInternal(Parcel.java:2226)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at android.os.Bundle.unparcel(Bundle.java:223)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at android.os.Bundle.getSparseParcelableArray(Bundle.java:1232)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at com.android.internal.policy.impl.PhoneWindow.restoreHierarchyState(PhoneWindow.java:1605)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at android.app.Activity.onRestoreInstanceState(Activity.java:928)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at android.app.Activity.performRestoreInstanceState(Activity.java:900)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at android.app.Instrumentation.callActivityOnRestoreInstanceState(Instrumentation.java:1130)
09-05 16:04:36.567: E/AndroidRuntime(1976):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2037)
09-05 16:04:36.567: E/AndroidRuntime(1976):     ... 11 more

我知道当我们尝试以错误的顺序读取包裹时会发生这种情况，但如果是这样的话，当我们旋转时不应该发生Exception设备也是？我相信它遵循完全相同的过程，但在今天之后我不能 100% 确定。

顺便说一下，这只发生在我添加了自定义 View 的 Activity 中。实现与支持库中的 FragmentTabHost 相同(实际上，我复制并修改了该源代码)，除了我所做的一些更改。但是更改不会影响以前的 FragmentTabHost 状态代码。以下是相关的代码 fragment -

static class SavedState extends BaseSavedState {

    String curTab;

    SavedState(final Parcelable superState) {

        super(superState);
    }

    private SavedState(final Parcel in) {

        super(in);
        curTab = in.readString();
    }

    @Override
    public void writeToParcel(final Parcel out, final int flags) {

        super.writeToParcel(out, flags);
        out.writeString(curTab);
    }

    @Override
    public String toString() {

        return "SavedStateFragmentTabHost.SavedState{"
                + Integer.toHexString(System.identityHashCode(this))
                + " curTab=" + curTab + "}";
    }

    public static final Parcelable.Creator<SavedState> SAVED_STATE_CREATOR = new Parcelable.Creator<SavedState>() {

        @Override
        public SavedState createFromParcel(final Parcel in) {

            return new SavedState(
                    in);
        }

        @Override
        public SavedState[] newArray(final int size) {

            return new SavedState[size];
        }
    };
}

@Override
protected Parcelable onSaveInstanceState() {

    final Parcelable superState = super.onSaveInstanceState();
    final SavedState ss = new SavedState(superState);
    ss.curTab = getCurrentTabTag();
    return ss;
}

@Override
protected void onRestoreInstanceState(final Parcelable state) {

    final SavedState ss = (SavedState) state;
    super.onRestoreInstanceState(ss.getSuperState());
    setCurrentTabByTag(ss.curTab);
}

如果我在自定义 FragmentTabHost 中注释掉 onSaveInstanceState() 和 onRestoreInstanceState() 方法，Exception 不会发生。以前有其他人遇到过这个问题吗？你能设法修复它吗？

Answer 1

我怀疑您必须将 SAVED_STATE_CREATOR 重命名为 CREATOR 才能使其正常工作。此静态字段的名称是 Parcelable 的一部分的契约(Contract)。