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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。

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