java.lang.IllegalStateException：尝试序列化引用新的未保存对象的命令（Parse.com）

Question

我对Android很新，我正在尝试使用Parse.com的数据库API构建应用程序。就像一周一样，我在访问数据库并从数据库中检索对象时遇到以下问题：

  

E / ParseCommandCache：saveEventually线程有错误。   java.lang.IllegalStateException：试图序列化引用新的命令＆gt;未保存的对象。   在com.parse.ParseCommand.resolveLocalIds（ParseCommand.java:407）   在com.parse.ParseCommand.onPreExecute（ParseCommand.java:306）   在com.parse.ParseRequest $ 7.then（ParseRequest.java:299）   在com.parse.ParseRequest $ 7.then（ParseRequest.java:296）   at com.parse.Task $ 11.run（Task.java:481）   在com.parse.Task $ ImmediateExecutor.execute（Task.java:673）   在com.parse.Task.completeAfterTask（Task.java:477）   在com.parse.Task.continueWithTask（Task.java:353）   在com.parse.Task.continueWithTask（Task.java:364）   at com.parse.ParseRequest.executeAsync（ParseRequest.java:296）   at com.parse.ParseRequest.executeAsync（ParseRequest.java:286）   在com.parse.ParseCommandCache.maybeRunAllCommandsNow（ParseCommandCache.java:487）   在com.parse.ParseCommandCache.runLoop（ParseCommandCache.java:597）   在com.parse.ParseCommandCache.access $ 000（ParseCommandCache.java:26）   在com.parse.ParseCommandCache $ 2.run（ParseCommandCache.java:146）

这是我的代码（如果它有点乱，我道歉，但我上周一直在尝试各种各样的事情，而且我没有太多时间进行重构或清理。）：

package com.example.boacterapp.Pages;

import java.sql.Date;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

import com.google.android.gms.maps.MapView;

import com.parse.FindCallback;
import com.parse.ParseException;
import com.parse.ParseGeoPoint;
import com.parse.ParseObject;
import com.parse.ParseQuery;

public class RecentSightings extends Activity {
    ListView listview;
    List<ParseObject> ob;
    ProgressDialog mProgressDialog;
    Alert alert;
    List<Alert> alerts;
    public ParseGeoPoint coordinates;
    private CustomAdapter adapter;


@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    this.setContentView(R.layout.list_view_layout);




}

private class RemoteDataTask extends AsyncTask<Void, Void, Void> {
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        // Create a progressdialog
        mProgressDialog = new ProgressDialog(RecentSightings.this);
        // Set progressdialog title
        mProgressDialog.setTitle("Parse.com Simple ListView Tutorial");
        // Set progressdialog message
        mProgressDialog.setMessage("Loading...");
        mProgressDialog.setIndeterminate(false);
        // Show progressdialog
        mProgressDialog.show();
    }

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


        ParseQuery<ParseObject> query = ParseQuery.getQuery("AlertsClass");
        try {
            ob = query.find();
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;






    }

    @Override
    protected void onPostExecute(Void result) {
        // Locate the listview in listview_main.xml
        listview = (ListView) findViewById(R.id.alertListView);


        getDataForListView();

        adapter = new CustomAdapter(RecentSightings.this,alerts);
        listview.setAdapter(adapter);

        // Close the progressdialog
        mProgressDialog.dismiss();
        // Capture button clicks on ListView items
        listview.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                // Send single item click data to SingleItemView Class
                Intent i = new Intent(RecentSightings.this,
                        AlertViewOnMap.class);
                // Pass data "name" followed by the position
                i.putExtra("coordinatesLatitude", alerts.get(position).getCoordinates().getLatitude());
                i.putExtra("coordinatesLongitude", alerts.get(position).getCoordinates().getLongitude());
                i.putExtra("description", alerts.get(position).getDescription().toString());
                i.putExtra("busNumber", alerts.get(position).getBusNumber());

                // Open SingleItemView.java Activity
                startActivity(i);

            }


        });
    }
}







public void getDataForListView(){
    final List<Alert> alerts = new ArrayList<Alert>();


    for (ParseObject alertParse : ob) {
            Alert alert = new Alert();
            alert.setBusNumber(alertParse.getInt("BusNumber"));
            alert.setCoordinates(alertParse.getParseGeoPoint("Coordinates"));
            alert.setCreatedAt(alertParse.getDate("createdAt"));
            alert.setDescription(alertParse.getString("Description"));

            alerts.add(alert);
    }



}

}

类CustomAdapter扩展了BaseAdapter {

Context context;
//ArrayList<HashMap<String,String>> data;
List<Alert> ob;

public CustomAdapter(Context context, List<Alert> ob){

    this.context = context;
    this.ob = ob;
}

@Override
public int getCount() {
    return ob.size();
}

@Override
public Object getItem(int pos) {
    return ob.get(pos);
}

@Override
public long getItemId(int pos) {
    return pos;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder holder;
    if(convertView==null){
        holder = new ViewHolder();
        convertView = LayoutInflater.from(context).inflate(R.layout.list_item,null,false);
        holder.channel = (TextView) convertView.findViewById(R.id.channelVariableLabel);
        holder.viewOnMap = (TextView) convertView.findViewById(R.id.viewOnMapVariableLabel);
        holder.description = (TextView) convertView.findViewById(R.id.descriptionVariableLabel);
        convertView.setTag(holder);
    }else{
        holder = (ViewHolder) convertView.getTag();
    }

    holder.channel.setText(ob.get(position).getBusNumber());
    holder.viewOnMap.setText("<Tap here to view alert on map>");
    holder.description.setText(ob.get(position).getDescription().toString());

    convertView.setTag(holder);
    return convertView;
}

class ViewHolder {
    TextView channel;
    TextView viewOnMap;
    TextView description;
}

}

class Alert {

private int busNumber;
private ParseGeoPoint coordinates;
private Date createdAt;
private String description;

public Alert () {

}
public void setCreatedAt(java.util.Date date) {
    // TODO Auto-generated method stub

}
public String getDescription() {
    return description;
}
public void setDescription(String description) {
    this.description = description;
}
public Date getCreatedAt() {
    return createdAt;
}
public void setCreatedAt(Date createdAt) {
    this.createdAt = createdAt;
}
public ParseGeoPoint getCoordinates() {
    return coordinates;
}
public void setCoordinates(ParseGeoPoint coordinates) {
    this.coordinates = coordinates;
}
public int getBusNumber() {
    return busNumber;
}
public void setBusNumber(int busNumber) {
    this.busNumber = busNumber;
}

}

所以，请全能的编程/ Java / Android / Parse.com用户的领主们，帮助这个凡人找到他的问题！

谢谢！尊重。