嘗試從包裹中檢索數據

Question

我有一個包含MenuItem對象的ArrayList的Order對象。這兩個類都實現了Parcelable接口。

當我試圖找回從意向對象的新的活動我得到以下錯誤：

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.waitron5/com.example.waitron5.SectionsActivity}: android.os.BadParcelableException: ClassNotFoundException when unmarshalling: com.example.waitron5.MenuItem

這裏就是我送訂單對象的代碼：

i = new Intent(v.getContext(), SectionsActivity.class); 
      i.putExtra("data", order); 
      startActivity(i); 

這裏是我檢索訂單對象的母鹿：

Intent i = getIntent(); 
    if(i != null && i.hasExtra("data")) 
    { 
     order = i.getParcelableExtra("data"); 
     Toast.makeText(
      this.getApplicationContext(), 
      "recieved order object, covers: " + 
       order.getCovers() + 
       " table no: " + 
       order.getTable() + 
       " order size: " + 
       order.getItems().size(), 
      Toast.LENGTH_SHORT).show(); 

訂單級別：

package com.example.waitron5; 

import java.util.ArrayList; 
import android.os.Parcel; 
import android.os.Parcelable; 

public class Order implements Parcelable { 

    private int covers; 
    private int table; 
    private ArrayList<MenuItem> items; 


    public Order(){ 
     super(); 
     this.items = new ArrayList<MenuItem>(); 

    } 

    public static final Parcelable.Creator<Order> CREATOR = 
    new Parcelable.Creator<Order>() { 

     @Override 
     public Order createFromParcel(Parcel source) { 
      return new Order(source); 
     } 

     @Override 
     public Order[] newArray(int size) { 
      return new Order[size]; 
     } 


    }; 

    public Order(int covers, int table) { 
     super(); 
     this.covers = covers; 
     this.table = table; 
     this.items = new ArrayList<MenuItem>(); 
    } 

    public int getCovers() { 
     return covers; 
    } 

    public void setCovers(int covers) { 
     this.covers = covers; 
    } 

    public int getTable() { 
     return table; 
    } 

    public void setTable(int table) { 
     this.table = table; 
    } 

    public ArrayList<MenuItem> getItems() { 
     return items; 
    } 

    public void setItems(ArrayList<MenuItem> items) { 
     this.items = items; 
    } 

    //add to order 
    public void addToOrder(MenuItem m){ 
     items.add(m); 
    } 

    //remove from order 
    public void removeFromOrder(MenuItem m){ 
     items.remove(m); 
    } 

    public Order(Parcel source) { 
     this(); 
     readFromParcel(source); 
    } 

    @Override 
    public int describeContents() { 
     // TODO Auto-generated method stub 
     return 0; 
    } 

    @Override 
    public void writeToParcel(Parcel dest, int flags) { 
     // TODO Auto-generated method stub 
     dest.writeInt(covers); 
     dest.writeInt(table); 
     dest.writeList(items); 
    } 

    @SuppressWarnings("unchecked") 
    private void readFromParcel(Parcel source) { 
     // TODO Auto-generated method stub 
     covers = source.readInt(); 
     table = source.readInt(); 
     source.readList(items, null); 

    } 
} 

MenuItem類：

package com.example.waitron5; 

import android.os.Parcel; 
import android.os.Parcelable; 

public class MenuItem implements Parcelable { 

    private String name; 
    private double price; 
    private int qty; 
    private String info; 

    public MenuItem(String name, double price) { 
     super(); 
     this.name = name; 
     this.price = price; 
    } 
    public MenuItem() { 
     // TODO Auto-generated constructor stub 
    } 
    public String getName() { 
     return name; 
    } 
    public void setName(String name) { 
     this.name = name; 
    } 
    public double getPrice() { 
     return price; 
    } 
    public void setPrice(double price) { 
     this.price = price; 
    } 

    public int getQty() { 
     return qty; 
    } 
    public void setQty(int qty) { 
     this.qty = qty; 
    } 
    public String getInfo() { 
     return info; 
    } 
    public void setInfo(String info) { 
     this.info = info; 
    } 
    @Override 
    public String toString() { 
     return name; 
    } 


    //Parcelable methods. 
    public static final Parcelable.Creator<MenuItem> CREATOR = 
     new Parcelable.Creator<MenuItem>() { 

     @Override 
     public MenuItem createFromParcel(Parcel source) { 
      return new MenuItem(source); 
     } 

     @Override 
     public MenuItem[] newArray(int size) { 
      return new MenuItem[size]; 
     } 
    }; 

    public MenuItem(Parcel source) { 
     this(); 
     readFromParcel(source); 
    } 

    private void readFromParcel(Parcel source) { 
     name = source.readString(); 
     price = source.readDouble(); 
    } 

    @Override 
    public int describeContents() { 
     return 0; 
    } 

    @Override 
    public void writeToParcel(Parcel dest, int flags) { 
     dest.writeString(name); 
     dest.writeDouble(price); 
    } 
} 

任何想法，以什麼可能會發生？

Answer 1

我解決了我的問題。問題如下：

在Order類中。

public void writeToParcel(Parcel dest, int flags) { 

    dest.writeInt(covers); 

    dest.writeInt(table); 

    dest.writeList(items); 

} 

應該是：

public void writeToParcel(Parcel dest, int flags) { 

    dest.writeInt(covers); 

    dest.writeInt(table); 

    dest.writeTypedList(items); 

} 

和

private void readFromParcel(Parcel source) { 

    covers = source.readInt(); 

    table = source.readInt(); 

    source.readList(items, null); 

} 

應該是：

private void readFromParcel(Parcel source) { 

    covers = source.readInt(); 

    table = source.readInt(); 

    items = new ArrayList<MenuItem>(); 

    source.readTypedList(items, MenuItem.CREATOR); 

}