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Android Fragment间对象传递

  由于Activity相对较为笨重,因而在日常的开发中很多时候会用到Fragment。然而Activity之间是通过Intent进行数据的传递,那Fragment是通过什么来进行传递的呢?Fragment之间又是通过什么方式来进行对象的传递呢?

  Android控件之间传递(Activity和Activity间传递对象、Fragment和Fragment间传递对象)对象有两种实现方式。一种是实现Java提供的Serializable接口,另一种是实现android提供的Parcelable接口。两者之间各有优势;实现Serializable接口的话最简单,直接添加接口的实现即可,但是效率较低;实现Parcelable的话效率较高,但需要自己实现Parcelable的方法。下面看下两种方法的具体实现:

  原有Article类

package com.example.news.andoridnewsapp;

public class Article {
    private String title;
    private String linkmd5;
    private String link;
    private String desc;

    public String getLinkmd5() {
        return linkmd5;
    }

    public void setLinkmd5(String linkmd5) {
        this.linkmd5 = linkmd5;
    }

    public String getLink() {
        return link;
    }

    public void setLink(String link) {
        this.link = link;
    }

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

    public String getTitle() {

        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }
}

  一、实现Serializable,只要在public class Article后面添加接口的实现(implements Serializable)即可

package com.example.news.andoridnewsapp;

public class Article implements Serializable {
    private String title;
    private String linkmd5;
    private String link;
    private String desc;

    public String getLinkmd5() {
        return linkmd5;
    }

    public void setLinkmd5(String linkmd5) {
        this.linkmd5 = linkmd5;
    }

    public String getLink() {
        return link;
    }

    public void setLink(String link) {
        this.link = link;
    }

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

    public String getTitle() {

        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }
}

  Fragment1进行参数传递

ArticleConententFragment fragment = new ArticleConententFragment();
Bundle args = new Bundle();
args.putSerializable(ARG_ARTICLE, article);

fragment.setArguments(args);

  Fragment2进行参数的接收

(Article) getArguments().getSerializable(ARG_ARTICLE);

  二、实现Parcelable,如果通过Parcelable的方式进行实现的话,需要实现Parcelable接口的方法describeContents(此方法一般不用修改)、writeToParcel(主要是此方法)和创建一个Creator属性。

package com.example.news.andoridnewsapp;

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

//public class Article implements Serializable {
public class Article implements Parcelable {
    private String title;
    private String linkmd5;
    private String link;
    private String desc;

    public String getLinkmd5() {
        return linkmd5;
    }

    public void setLinkmd5(String linkmd5) {
        this.linkmd5 = linkmd5;
    }

    public String getLink() {
        return link;
    }

    public void setLink(String link) {
        this.link = link;
    }

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

    public String getTitle() {

        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    @Override
    public String toString() {
        return this.title;
    }

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

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        Bundle bundle = new Bundle();
        bundle.putString("title", getTitle());
        bundle.putString("desc", getDesc());
        bundle.putString("link", getLink());
        bundle.putString("linkmd5", getLinkmd5());
        dest.writeBundle(bundle);
    }

    public static final Creator<Article> CREATOR = new Creator<Article>() {
        @Override
        public Article createFromParcel(Parcel source) {
            Bundle bundle = source.readBundle();
            Article article = new Article();
            article.setTitle(bundle.getString("title"));
            article.setDesc(bundle.getString("desc"));
            article.setLink(bundle.getString("link"));
            article.setLinkmd5(bundle.getString("linkmd5"));
            return article;
        }

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

  Fragment1进行参数传递

ArticleConententFragment fragment = new ArticleConententFragment();
Bundle args = new Bundle();
//args.putSerializable(ARG_ARTICLE, article);
args.putParcelable(ARG_ARTICLE, article);

fragment.setArguments(args);

  Fragment2进行参数接收

//            mArticle = (Article) getArguments().getSerializable(ARG_ARTICLE);
            mArticle = (Article) getArguments().getParcelable(ARG_ARTICLE);

  这样便可方便地实现对象参数的传递。其实传递的是一个Bundle对象,如果实现的是Serializable接口,则通过Bundle的putSerializable和getSerializable进行设置和获取;如果实现的是Parceable接口,则通过putParceable和getParceable进行设置和获取。

posted @ 2015-10-21 18:14  秋楓  阅读(10449)  评论(0编辑  收藏  举报