Question

我有三个片段和一个对象，我需要从第一个传递到第二个然后传递到第三个片段。

首先：

 ArrayList<Article> list = app.getDb().getArticles("userId", app.getUser(getActivity()).getId(),
                "id", item.getId());
        FragmentTransaction t = getActivity().getSupportFragmentManager().beginTransaction();
        ArticleFragment mFrag = new ArticleFragment();
        Bundle bundle = new Bundle();
        bundle.putParcelable("article", list.get(0));
        mFrag.setArguments(bundle);
        t.replace(R.id.fragment_container, mFrag, ArticleFragment.TAG);
        t.addToBackStack(ArticleFragment.TAG);
        t.commit();

第二

 article = getArguments().getParcelable("article");
// some actions
 ArticleEditFragment mFrag = new ArticleEditFragment();
                Bundle bundle = new Bundle();
                bundle.putParcelable("article_edit", article);
                mFrag.setArguments(bundle);

                FragmentTransaction t = getActivity().getSupportFragmentManager().beginTransaction();
                t.replace(R.id.fragment_container, mFrag, ArticleEditFragment.TAG);
                t.addToBackStack(null);
                t.commit();

第三

article = getArguments().getParcelable("article_edit");
//some actions with article

当我完成第三个片段并返回第二个片段时，问题是文章改变了。第二个包含我在第三个片段中编辑的相同对象。如何解决这个问题？

Answer 1

在您的First片段中，您已将包中的值作为articles_list传递，而在您的第二个中，您将其article作为articles_list获得。因此，请在Second片段中将其更改为如下所示：

更改以下行：

 article = getArguments().getParcelable("article");

要

 article = getArguments().getParcelable("articles_list");

Answer 2

我的解决方法是在Article class中创建自己的'Clone'方法。

        incomeArticle = getArguments().getParcelable("article_edit");
        article = incomeArticle.cloneArticle();


 /**
         * Clone all field of current article to new
         *
         * @return new article
         */
        public Article cloneArticle() {
            Article article = new Article();
            article.setName(this.name);
            article.setId(this.id);
            article.setUserId(this.userId);
            article.setTypeId(this.typeId);
            article.setPictureId(this.pictureId);
            article.setAccess(this.access);
            if (this.pictures != null) {
                article.setPictures((ArrayList<String>) this.pictures.clone());
            } else {
                article.setPictures(new ArrayList<String>());
            }
            article.setComments(this.comments);
            if (this.tags != null) {
                article.setTags((ArrayList<String>) this.tags.clone());
            } else {
                article.setTags(new ArrayList<String>());
            }
            if (this.care != null) {
                article.setCare((ArrayList<String>) this.care.clone());
            } else {
                article.setCare(new ArrayList<String>());
            }
            article.setFitLevel(this.fitLevel);
            article.setRating(this.rating);
            if (this.materials != null) {
                article.setMaterials((ArrayList<ArticleMaterial>) this.materials.clone());
            } else {
                article.setMaterials(new ArrayList<ArticleMaterial>());
            }
            article.setBuyingDate(this.buyingDate);
            article.setSize(this.size);
            article.setArticul(this.articul);
            article.setPrice(this.price);
            article.setMadeInCountryId(this.madeInCountryId);
            article.setCurrencyId(this.currencyId);
            article.setCommentsCount(this.commentsCount);
            article.setToWeight(this.toWeight);
            article.setBrandId(this.brandId);
            article.setChanged(this.changed);
            article.setShowWeight(this.showWeight);
            article.setCreated(this.created);
            article.setDescription(this.description);
            article.setIsLiked(this.isLiked);
            article.setLikeRating(this.likeRating);
            article.setFromWeight(this.fromWeight);
            article.setGuid(this.guid);
            return article;
        }

Answer 3

进行更改在第二个片段

article = new  Article(getArguments().getParcelable("article"));

在第三个片段中

article = new  Article(getArguments().getParcelable("articles_list"));

并在你的文章pojo中创建一个构造函数

Article(Article A1)
{
value1=A1.value1;
value2=A1.value2;
value3=A1.value3;
...
}

希望这有帮助

在Android中传递三个片段之间的捆绑

3 个答案: