Android序列化Parcelable、Serializable

在Android中序列化实体类的方法有两种:

一:Serializable

优点:

此方法特别简单,只需直接在实体类上声明Serializable接口

缺点:

效率没有Parcelable高

二:Parcelable,

优点:

序列化及反序列号效率高   

缺点:

当数据将会被缓存进内存中的时候不建议这么做,容易导致数据丢失

使用方法:

先码上未被序列化的实体类

public class Student {
private String name;
private int age;
private List<Book> books;
class Book{
private String bookName;
private double bookPrice;

public String getBookName() {
return bookName;
}

public void setBookName(String bookName) {
this.bookName = bookName;
}

public double getBookPrice() {
return bookPrice;
}

public void setBookPrice(double bookPrice) {
this.bookPrice = bookPrice;
}
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

public List<Book> getBooks() {
return books;
}

public void setBooks(List<Book> books) {
this.books = books;
}
}

一:Serializable

只需在Student后加上Serializable如下

public class Student implements Serializable{
private String name;
private int age;
private List<Book> books;
class Book{
private String bookName;
private double bookPrice;

public String getBookName() {
return bookName;
}

public void setBookName(String bookName) {
this.bookName = bookName;
}

public double getBookPrice() {
return bookPrice;
}

public void setBookPrice(double bookPrice) {
this.bookPrice = bookPrice;
}
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

public List<Book> getBooks() {
return books;
}

public void setBooks(List<Book> books) {
this.books = books;
}
}

二:Parcelable,

AndroidStudio建议使用插件
然后打开File -> Settings -> Pugins -> Browse Repositories 如下，输入android
parcelable code generator：



安装成功后需要重启AndroidStudio

Alt+ins键  然后点击Parcelable



全选之后点击OK

到了这一步有个坑,如果实体类中还有内部类的话到此还没有结束!

运行时会报AndroidRunTime error:Parcel:unable to marshal value异常所以我们还有一步没有完成

内部类Book也需要序列化

最后完整的Parcelable序列化的代码如下

public class Student implements Parcelable {
private String name;
private int age;
private List<Book> books;

public static class Book implements Parcelable {

private String bookName;
private double bookPrice;

public String getBookName() {
return bookName;
}

public void setBookName(String bookName) {
this.bookName = bookName;
}

public double getBookPrice() {
return bookPrice;
}

public void setBookPrice(double bookPrice) {
this.bookPrice = bookPrice;
}

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

@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(this.bookName);
dest.writeDouble(this.bookPrice);
}

public Book() {
}

protected Book(Parcel in) {
this.bookName = in.readString();
this.bookPrice = in.readDouble();
}

public static final Creator<Book> CREATOR = new Creator<Book>() {
@Override
public Book createFromParcel(Parcel source) {
return new Book(source);
}

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

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

public List<Book> getBooks() {
return books;
}

public void setBooks(List<Book> books) {
this.books = books;
}

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

@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(this.name);
dest.writeInt(this.age);
dest.writeList(this.books);
}

public Student() {
}

protected Student(Parcel in) {
this.name = in.readString();
this.age = in.readInt();
this.books = new ArrayList<Book>();
in.readList(this.books, Book.class.getClassLoader());
}

public static final Parcelable.Creator<Student> CREATOR = new Parcelable.Creator<Student>() {
@Override
public Student createFromParcel(Parcel source) {
return new Student(source);
}

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