Question

请在回答/评论前查看编辑！

所以我有以下代码，我在asynctask的onPostExecute（）方法中的活动之间传递数据，并且我的应用程序经常崩溃并出现stackoverflow错误:(注意：这不是我的完整活动）

public class Wrapper{
    public Elements gradeList;
}

private class infoGetter extends AsyncTask<Void, Void, Wrapper> {

    ProgressDialog progress;

    public infoGetter(WelcomeLogin activity){

        progress = new ProgressDialog(activity);

    }

    @Override
    protected void onPreExecute() {

        progress.setTitle("Logging in:");
        progress.setMessage("Please wait...");
        progress.show();
    }

    @Override
    protected Wrapper doInBackground(Void... params) {

        Wrapper w = new Wrapper();

        String studentID = studentID2.getText().toString();
        String username = user.getText().toString();
        String password = pass.getText().toString();

        String loginURL = "https://parents.mtsd.k12.nj.us/genesis/parents/j_security_check";
        String userDataUrl = "https://parents.mtsd.k12.nj.us/genesis/parents?tab1=" + tab1 + "&tab2=" + tab2 + "&tab3=" + tab3 + "&studentid=" + studentID + "&action=" + action;

        Response response = new GradeFetcher().getRequest(userDataUrl);
        Document loggedInDocument = new GradeFetcher().postRequest(loginURL, username, password, studentID, response);
        Elements grades = new GradeFetcher().gradeExtractor(loggedInDocument);

        for(Element grade : grades) {

            Log.e("Grades: ",grade.text());

        }

        w.gradeList = grades;
        Log.e("MESSAGE: ","Going to onPostExecute");


        return w;
    }

    protected void onPostExecute(Wrapper w) {

        Log.e("MESSAGE: ", "Starting onPostExecute");

        Gson gson = new Gson();
        String serial = gson.toJson(w.gradeList,Elements.class);
        Intent GradeList = new Intent(getApplicationContext(), MainList.class);
        GradeList.putExtra("grades", serial);
        startActivity(GradeList);

        Log.e("MESSAGE: ", "Going to next activity now");
        progress.dismiss();


    }
}

我收到以下错误：

08-03 13:33:28.592  27871-28323/com.aurum.gradebook E/MESSAGE:﹕ Going to onPostExecute
08-03 13:33:28.604  27871-27871/com.aurum.gradebook E/MESSAGE:﹕ Starting     onPostExecute
08-03 13:33:37.013  27871-27871/com.aurum.gradebook E/AndroidRuntime﹕ FATAL         EXCEPTION: main
Process: com.aurum.gradebook, PID: 27871
java.lang.StackOverflowError: stack size 8MB
        at java.io.StringWriter.write(StringWriter.java:147)
        at com.google.gson.stream.JsonWriter.string(JsonWriter.java:534)
        at com.google.gson.stream.JsonWriter.writeDeferredName(JsonWriter.java:402)
        at com.google.gson.stream.JsonWriter.value(JsonWriter.java:417)
        at com.google.gson.internal.bind.TypeAdapters$13.write(TypeAdapters.java:362)
        at com.google.gson.internal.bind.TypeAdapters$13.write(TypeAdapters.java:346)
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:99)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:219)
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)
        at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.write(MapTypeAdapterFactory.java:208)
        at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.write(MapTypeAdapterFactory.java:145)
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:99)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:219)
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:99)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:219)
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:99)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:219)
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)
        at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:96)
        at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:60)
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:99)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:219)
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:99)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:219)
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)
        at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:96)
        at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:60)
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:99)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:219)
         at   com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRun timeTypeWrapper.java:68)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterF

我无法找到导致此情况发生的地点/原因。请帮忙！

编辑1：我现在知道我的错误在于声明：

String serial = gson.toJson(w.gradeList,Elements.class);

我认为这意味着我的＆＃34; w.gradeList＆＃34;太大了但是，这是一个简单的Jsoup Elements对象，包含大约6个废弃的等级（例如＆＃34; 100％），所以我不知道这是怎么回事。我知道这个错误很可能是由于循环引用，但我无法找到发生这种情况的地方。 （我也不想使用临时文件或意图以外的任何东西传递我的数据，因为他们完全有能力这样做）

Answer 1

根据我的经验，您可以在Intent内的Bundle中放入1MB的数据。虽然没有记录，但android aosp中存在一个问题。问题网址：https://code.google.com/p/android/issues/detail?id=5878

你最初的问题在于String serial = gson.toJson(w.gradeList,Elements.class);即使你成功克服了这个错误，你也将面临GradeList.putExtra("grades", serial);中最难的挑战，你的serial太大而无法携带，显然它是8MB [了解堆栈跟踪]。

如何解决此限制：

由于你显然无法超越这个限制，你现在可以做什么。将内容写入存储。我不确定您是否可以将这些数据写入SharedPreference（我相信它可以完成），但您可以在临时文件中写入，然后将文件uri发送到活动。你在那里再次阅读文件。我希望这可以帮助你。

需要回答：序列化数据时出现Android堆栈溢出错误

1 个答案: