android - 之后关闭程序时出现AsyncTask android错误

Question

我正在开发一个 android 新闻阅读器应用程序。我有一个实现 Serializable 的 AsyncTask，这样我就可以保存实例。我在旋转手机时使用它来处理应用程序刷新。它工作，当我旋转我的应用程序时，任务仍在运行。但是当任务运行时，我按下主页按钮/返回按钮关闭我的应用程序，我的应用程序被强制关闭。我的代码有什么问题吗？

@Override
protected void onSaveInstanceState(final Bundle outState) {
    // super.onSaveInstanceState(outState);
    outState.putInt("curPage", mPager.getCurrentItem());
    outState.putInt("drawerPos", drawerPos);
    outState.putSerializable("task", task);
    if (dialog != null) {
        outState.putBoolean("isDialogShowing", dialog.isShowing());
    } else {
        outState.putBoolean("isDialogShowing", false);
    }
    // outState.putSerializable("dialog", dialog);
}

// dismiss dialog if activity is destroyed
@Override
protected void onDestroy() {
    if (dialog != null && dialog.isShowing()) {
        dialog.dismiss();
        dialog = null;
    }
    if (task.getStatus() == AsyncTask.Status.RUNNING)
        task.cancel(true);
    task = null;
    super.onDestroy();
}

我的异步任务：

public class AsyncTaskRefreshRss extends
    AsyncTask<String, String, ArrayList<BeritaHeader>> implements Serializable{

/**
 * 
 */
private static final long serialVersionUID = 3385729493967673390L;

private OnResponseListener responder;

// MyAlertDialogFragment myDialog;
ProgressDialog dialog;
FragmentManager fm;
Context context;
String type;
String subtype;

public AsyncTaskRefreshRss(Context context, FragmentManager fm,
        String type, String subtype, OnResponseListener listener) {
    this.fm = fm;
    this.context = context;
    this.type = type;
    this.subtype = subtype;
    this.responder = listener;
}

public void setFinishListener(OnResponseListener listener){
    this.responder = listener;
}

public void setDialog(ProgressDialog dialog) {
    this.dialog = dialog;
}

@Override
protected void onPreExecute() {
    dialog.show();
}

@Override
protected ArrayList<BeritaHeader> doInBackground(String... arg0) {
    MyWebService ws = new MyWebService();
    try {
        return ws.GetRSS(type, subtype);
    } catch (Exception e) {
        return null;
    }

}

public interface OnResponseListener {
    public void onSuccess();

    public void onFailure();
}

@Override
protected void onPostExecute(ArrayList<BeritaHeader> result) {
    if (dialog.isShowing())
        dialog.dismiss();
    if (result != null) {
        NewsDataSource ds = new NewsDataSource(context);
        ds.deleteAllBerita(type, subtype);
        ds.createBerita(result, type, subtype);
        responder.onSuccess();
    } else {
        Toast toast = Toast.makeText(context, "Gagal memuat",
                Toast.LENGTH_LONG);
        toast.show();
        responder.onFailure();
    }
    // asyncState = DO_NOTHING;
}

public static class MyAlertDialogFragment extends DialogFragment {

    public boolean isCanceled;

    public static MyAlertDialogFragment newInstance() {
        MyAlertDialogFragment frag = new MyAlertDialogFragment();
        return frag;
    }

    public Dialog onCreateDialog(Bundle savedInstanceState) {
        final ProgressDialog dialog = new ProgressDialog(getActivity());
        dialog.setMessage("Sedang Memuat");
        dialog.setIndeterminate(false);
        dialog.setCancelable(false);
        dialog.setOnCancelListener(new OnCancelListener() {

            @Override
            public void onCancel(DialogInterface dialog) {
                // TODO Auto-generated method stub
                isCanceled = true;
            }
        });
        isCanceled = false;
        return dialog;
    }

}
}

我的日志猫：

07-19 19:37:00.905: E/AndroidRuntime(29243): FATAL EXCEPTION: main
07-19 19:37:00.905: E/AndroidRuntime(29243): java.lang.RuntimeException: Parcelable encountered IOException writing serializable object (name = com.karyadigital.beritaku.berita.AsyncTaskRefreshRss)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at android.os.Parcel.writeSerializable(Parcel.java:1279)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at android.os.Parcel.writeValue(Parcel.java:1233)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at android.os.Parcel.writeMapInternal(Parcel.java:591)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at android.os.Bundle.writeToParcel(Bundle.java:1619)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at android.os.Parcel.writeBundle(Parcel.java:605)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at android.app.ActivityManagerProxy.activityStopped(ActivityManagerNative.java:2247)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at android.app.ActivityThread$StopInfo.run(ActivityThread.java:2915)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at android.os.Handler.handleCallback(Handler.java:615)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at android.os.Handler.dispatchMessage(Handler.java:92)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at android.os.Looper.loop(Looper.java:137)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at android.app.ActivityThread.main(ActivityThread.java:4898)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at java.lang.reflect.Method.invokeNative(Native Method)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at java.lang.reflect.Method.invoke(Method.java:511)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1008)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:775)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at dalvik.system.NativeStart.main(Native Method)
07-19 19:37:00.905: E/AndroidRuntime(29243): Caused by: java.io.NotSerializableException: android.app.Application
07-19 19:37:00.905: E/AndroidRuntime(29243):    at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1364)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:979)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:368)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1074)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1404)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
07-19 19:37:00.905: E/AndroidRuntime(29243):    at android.os.Parcel.writeSerializable(Parcel.java:1274)
07-19 19:37:00.905: E/AndroidRuntime(29243):    ... 15 more

score 2 · Accepted Answer

您只是无法制作AsyncTaskSerializable 并对其进行序列化。为什么：你不能做，因为系统会尝试序列化它的所有字段等等每个字段的字段。如果一个字段不是可序列化的并且没有标记，transient那么你会得到上面的异常。

如果要在AsyncTask重新创建 Activity 时将其与 Activity 解耦，请使用 Fragments 的配置更改。这是一篇描述如何.

score 0 · Accepted Answer

由于您班级中的 Context 字段，此操作失败。上下文对象不可序列化。

“在遍历图时，可能会遇到不支持 Serializable 接口的对象。在这种情况下，将抛出 NotSerializableException 并标识不可序列化对象的类。”

您可以完全删除 Context 字段，也可以将瞬态属性应用于 Context 字段，使其不被序列化。

public class MyClass implements Serializable 
{
    ...
    public transient Context myContext;
    ...
}

android - 之后关闭程序时出现AsyncTask android错误

2 回答 2

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