Question

我正在使用google sheet api（https://developers.google.com/google-apps/spreadsheets/），我正在尝试传递我创建的只包含List的类，并实现Serializable。

这里是SerializableSpreadsheetList类：

public class SerializableSpreadsheetList implements Serializable {

    private List<SpreadsheetEntry> spreadsheets;


    public SerializableSpreadsheetList(List<SpreadsheetEntry> list){
        this.spreadsheets=list;
    }

    public List<SpreadsheetEntry> getSpreadsheets() {
        return spreadsheets;
    }


}

以及启动活动的代码：

mUpdatePracticeIntent.putExtra("isSpreadsheetsSet", true);
SerializableSpreadsheetList SerializableList=new SerializableSpreadsheetList(mSpreadsheets);
mUpdatePracticeIntent.putExtra("Spreadsheets", SerializableList);

startActivity(mUpdatePracticeIntent);

当我尝试开始活动时，应用程序崩溃了。

这是Logcat：

02-18 18:03:40.280: E/AndroidRuntime(17696): FATAL EXCEPTION: main
02-18 18:03:40.280: E/AndroidRuntime(17696): java.lang.RuntimeException: Parcelable encountered IOException writing serializable object (name = com.example.keeptrack.SerializableSpreadsheetList)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at android.os.Parcel.writeSerializable(Parcel.java:1176)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at android.os.Parcel.writeValue(Parcel.java:1130)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at android.os.Parcel.writeMapInternal(Parcel.java:488)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at android.os.Bundle.writeToParcel(Bundle.java:1552)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at android.os.Parcel.writeBundle(Parcel.java:502)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at android.content.Intent.writeToParcel(Intent.java:5659)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:1411)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at android.app.Instrumentation.execStartActivity(Instrumentation.java:1377)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at android.app.Activity.startActivityForResult(Activity.java:2833)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at android.app.Activity.startActivity(Activity.java:2959)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at com.example.keeptrack.HomeActivity$2.onClick(HomeActivity.java:112)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at android.view.View.performClick(View.java:2585)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at android.view.View$PerformClick.run(View.java:9299)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at android.os.Handler.handleCallback(Handler.java:587)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at android.os.Handler.dispatchMessage(Handler.java:92)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at android.os.Looper.loop(Looper.java:130)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at android.app.ActivityThread.main(ActivityThread.java:3691)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at java.lang.reflect.Method.invokeNative(Native Method)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at java.lang.reflect.Method.invoke(Method.java:507)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:670)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at dalvik.system.NativeStart.main(Native Method)
02-18 18:03:40.280: E/AndroidRuntime(17696): Caused by: java.io.NotSerializableException: com.google.gdata.data.spreadsheet.SpreadsheetEntry
02-18 18:03:40.280: E/AndroidRuntime(17696):    at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1535)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1847)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1689)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1653)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at java.util.LinkedList.writeObject(LinkedList.java:973)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at java.lang.reflect.Method.invokeNative(Native Method)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at java.lang.reflect.Method.invoke(Method.java:507)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1219)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1575)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1847)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1689)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1653)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:1143)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:413)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1241)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1575)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1847)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1689)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1653)
02-18 18:03:40.280: E/AndroidRuntime(17696):    at android.os.Parcel.writeSerializable(Parcel.java:1171)
02-18 18:03:40.280: E/AndroidRuntime(17696):    ... 21 more

我做错了什么？提前谢谢

Answer 1

使用AsyncTask

代替您的代码启动活动

AsyncTask<Void, Void, List<SpreadsheetEntry>> myTask = new AsyncTask<Void, Void, List<SpreadsheetEntry>>()
        {
            @Override
            protected List<SpreadsheetEntry> doInBackground(Void... params)
            {
                List<SpreadsheetEntry> entries;

                // Get your entries from internet here

                return entries;
            }

            @Override
            protected void onPostExecute(List<SpreadsheetEntry> myEntries)
            {
                SpreadsheetEntrySingleton.getInstance().setEntries(myEntries);

                startActivity(mUpdatePracticeIntent);
            }
        };

        myTask.execute();

<强> SpreadsheetEntrySingleton.java

public class SpreadsheetEntrySingleton
{
    private static volatile SpreadsheetEntrySingleton _spreadsheetEntrySingleton;

    private List<SpreadsheetEntry> _entries;

    private SpreadsheetEntrySingleton()
    {
        super();
    }

    public static SpreadsheetEntrySingleton getInstance()
    {
        if (SpreadsheetEntrySingleton._spreadsheetEntrySingleton == null)
        {
            synchronized (SpreadsheetEntrySingleton.class)
            {
                if (SpreadsheetEntrySingleton._spreadsheetEntrySingleton == null)
                {
                    SpreadsheetEntrySingleton._spreadsheetEntrySingleton = new SpreadsheetEntrySingleton();
                }
            }
        }

        return SpreadsheetEntrySingleton._spreadsheetEntrySingleton;
    }

    public List<SpreadsheetEntry> getEntries()
    {
        return _entries;
    }

    public void setEntries(List<SpreadsheetEntry> list)
    {
        this._entries = list;
    }
}

在mUpdatePracticeIntent的OnCreate（）方法中，使用SpreadsheetEntrySingleton.getInstance().getEntries()来获取您的参赛作品。

android pass在活动之间列出<spreadsheet> </spreadsheet>

1 个答案: