Android序列化Parcelable

Android在各个Activity之间传递List<MealItem>时，需要将MealItem序列化；

而在Android中序列化有两种方式：实现Serializable接口或者实现Parcelable接口，两者可以实现同样的目的，后者效率高但实现不如Serializable方便；

在Android中推荐后者

1. 实现Serializable接口

Serializable是JavaSE中自带的接口，实现起来很简单，只需要在实例类中implementsSerializable即可

<span style="font-size:14px;">public class MealItem implements Serializable{private String name;//菜品名称private String price;//菜品现价private int count;//预订数量public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPrice() {return price;}public void setPrice(String price) {this.price = price;}public int getCount() {return count;}public void setCount(int count) {this.count = count;}}</span>

2. 实现 Parcelable接口

Parcelable是Android中特有的接口，其效率高，因此在Android中被推荐

实现此接口需要实现两个方法以及一个CREATOR：

public int describeContents();

public void writeToParcel(Parcel dest, int flags);

public static final Parcelable.Creator<MealItem> CREATOR = new Creator<MealItem>() {
@Override
public MealItem createFromParcel(Parcel source);
@Override
public MealItem[] newArray(int size);
};

writeToParcel的顺序应该与CREATOR的createFromParcel保持一致

例子如下：可对比实现Serializable时的代码；

<span style="font-size:18px;">public class MealItem implements Parcelable {private String name;//菜品名称private String price;//菜品现价private int count;//预订数量public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPrice() {return price;}public void setPrice(String price) {this.price = price;}public int getCount() {return count;}public void setCount(int count) {this.count = count;}@Overridepublic int describeContents() {return 0;}@Overridepublic void writeToParcel(Parcel dest, int flags) {dest.writeString(name);dest.writeString(price);dest.writeInt(count);}public static final Parcelable.Creator<MealItem> CREATOR = new Creator<MealItem>() {@Overridepublic MealItem createFromParcel(Parcel source) {MealItem mealItem = new MealItem();mealItem.setName(source.readString());mealItem.setPrice(source.readString());mealItem.setCount(source.readInt());return null;}@Overridepublic MealItem[] newArray(int size) {return new MealItem[size];}};}</span>

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