序列化Serializable和Parcelable

序列化主要有两种方式：Serializable，Parcelable；
区别：
内存的序列化Parcelable（直接读取内存，效率高，使用略麻烦）
序列化到本地存储设备或序列化后通过网络传输使用Serializable
优缺点：
Parcelable：直接读取内存，效率高，使用略麻。
Serializable：使用简单，开销大，（序列化过程会产生大量的I/O操作）
class序列化
Serializable

public class User implements Serializable {
    private static final long serialVersionUID=1L;

    public int userId;
    public String userName;
    public boolean isMale;
}

User n = new User();
Intent i = new Intent(A.this, B.class);
i.putExtra("User", u);
startActivity(i);    

User u = (User)getIntent().getSerializableExtra("User");  

Parcelable

public class User implements Parcelable {

    public int userId;
    public String userName;
    public boolean isMale;
    
    @Override
    public int describeContents() {
        return 0;
    }
    /**
    *序列化
    */
    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(userId);
        dest.writeString(userName);
        dest.writeInt(isMale?1:0);
    }
    /**
     * 反序列化
     */
    public static final Parcelable.Creator<User> CREATOR = new Creator<User>() {
        @Override
        public User createFromParcel(Parcel source) {
            return new User(source);
        }

        @Override
        public User[] newArray(int size) {
            return new User[size];
        }
    };
    private User(Parcel source){
        userId = source.readInt();
        userName = source.readString();
        isMale = source.readInt() == 1;
    }
}

Intent intent = new Intent(A.this,B.class);  
Bundle mBundle = new Bundle();  
mBundle.putParcelable("User", u);  
intent.putExtras(mBundle);  
startActivity(intent);  

User u= (User)getIntent().getParcelableExtra("User"); 

对象的序列化

        File file = new File("person.out");  
        ObjectOutputStream oout = new ObjectOutputStream(new FileOutputStream(file));  
        Person person = new Person("John", 101, Gender.MALE);  
        oout.writeObject(person);  
        oout.close();  
 
        ObjectInputStream oin = new ObjectInputStream(new FileInputStream(file));  
        Object newPerson = oin.readObject(); // 没有强制转换到Person类型  
        oin.close();  

使用Android Studio插件序列化

安卓插件
File -> Settings -> Pugins -> Browse Repositories 如下，输入android parcelable code generator
Mac OS control+enter

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