java - 如何使 RealmList 可打包

Question

我需要在 Realm 模型中实现 Parcelable 接口(interface)，但我不知道如何在 Parcel 中编写 RealmList

这是我的代码:

public class SomeModel extends RealmObject implements Parcelable {
  public long id;

  public RealmList<SomeOtherModel> otherModels;

  protected SomeModel(Parcel in) {
   id = in.readLong();
   //here i need to otherModel RealmList from parcel
  }

  @Override
  public void writeToParcel(Parcel dest, int flags) {
    dest.writeLong(id);
    // here i need to write the otherModels RealmList
  }
  //other methods omitted 
}

pd: SomeOtherModel 类也实现了 Parcelable 接口(interface)并扩展了 RealmObject

Answer 1

实际上你可以

首先我们讨论的是非托管实体。

然后你需要用new RealmList<>()初始化realmList .然后使用 addAll 将数据作为集合添加到其中方法。就是这样!这是一个示例:

Person.java:

package com.entity;

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

import java.util.ArrayList;

import io.realm.RealmList;

/**
 * Person
 * Created by Maher Abuthraa on 6/9/17.
 */

public class Person implements Parcelable {
    @PrimaryKey
    private long id;

    private String name;
    private RealmList<Dog> mRealmList;

    public Person() {
    }

    public Person(long id, String name) {
        this.id = id;
        this.name = name;
    }

    public long getId() {
        return id;
    }

    public Person setId(long id) {
        this.id = id;
        return this;
    }

    public String getName() {
        return name;
    }

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

    public RealmList<Dog> getRealmList() {
        return mRealmList;
    }

    public Person setRealmList(ArrayList<Dog> dogList) {
        mRealmList = new RealmList<>();
        mRealmList.addAll(dogList);
        return this;
    }


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

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeLong(this.id);
        dest.writeString(this.name);
        dest.writeTypedList(this.mRealmList);
    }

    protected Person(Parcel in) {
        this.id = in.readLong();
        this.name = in.readString();
        this.mRealmList = new RealmList<>();
        this.mRealmList.addAll(in.createTypedArrayList(Dog.CREATOR));
    }

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

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

Dog.java:

package com.entity;

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

import io.realm.RealmObject;
import io.realm.annotations.PrimaryKey;

/**
 * Dog
 * Created by Maher Abuthraa on 6/9/17.
 */

public class Dog extends RealmObject implements Parcelable {
    @PrimaryKey
    private long id;

    private String name;
    private int age;

    public Dog() {
    }

    public Dog(long id, String name, int age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }

    public long getId() {
        return id;
    }

    public Dog setId(long id) {
        this.id = id;
        return this;
    }

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

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


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

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

    protected Dog(Parcel in) {
        this.id = in.readLong();
        this.name = in.readString();
        this.age = in.readInt();
    }

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

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

我希望这会有所帮助，'。