如何使用 Retrofit 2 Android 将数据加载到 RecyclerView 中

Question

我想从服务器加载数据并显示到 recyclerView，我使用 Retrofit2 进行连接。
首先我加载 categoryData 没关系，我可以看到 categoryData。但是当单击类别 post 时，我想将此 post 数据加载到其他 activity 但是当转到此 activity 不显示数据 !

我通过 postID 加载此 post 并设置此 postID 在 URL.

使用此代码，我使用此代码将 postID 从 categoryAdapter 传递到 activity：

((DataViewHolder) holder).main_post_image.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int pos = holder.getPosition();
                R_CatModel model = mDateSet.get(pos);
                v.getContext().startActivity(new Intent(v.getContext(), PostShow_page.class)
                        .putExtra("postID", model.getId())

postShowActivity retrofit ApiInterface :

@GET("api/get_post")
Call<R_PostModelResponse> getPostResponse(@Query("post_id") Integer id);

post显示活动代码：

private void bindData() {

        // Setup Connect
        Retrofit_ApiInterface apiInterface = Retrofit_ApiClient.getClient().create(Retrofit_ApiInterface.class);
        Call<R_PostModelResponse> call = apiInterface.getPostResponse(postID);

        call.enqueue(new Callback<R_PostModelResponse>() {
            @Override
            public void onResponse(Call<R_PostModelResponse> call, Response<R_PostModelResponse> response) {

                if (response != null) {

                    models = response.body().getPost();

                    mAdaper = new CommentAdapter2(context, models);
                    Toast.makeText(PostShow_page.this, "GoTo Adapter", Toast.LENGTH_SHORT).show();
                    comment_Recyclerview.setAdapter(mAdaper);

                }
            }

            @Override
            public void onFailure(Call<R_PostModelResponse> call, Throwable t) {

            }
        });
    }

post显示适配器代码：

public class CommentAdapter2 extends RecyclerView.Adapter<CommentAdapter2.ViewHolder> {

    private List<R_PostModel> mDataSet;
    private Context context;

    public CommentAdapter2(Context context,List<R_PostModel> mDataSet) {
        this.mDataSet = mDataSet;
        this.context = context;
    }

    @Override
    public CommentAdapter2.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.comment_layout, viewGroup, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(CommentAdapter2.ViewHolder viewHolder, int position) {

        viewHolder.comment_name.setText(mDataSet.get(position).getComments().get(1).getCmName());
        viewHolder.comment_date.setText(mDataSet.get(position).getComments().get(4).getCmDate());
        viewHolder.comment_content.setText(mDataSet.get(position).getComments().get(3).getCmContent());


    }

    @Override
    public int getItemCount() {
        return mDataSet.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder{

        private TextView comment_name, comment_content, comment_date;

        public ViewHolder(View view) {
            super(view);

            comment_name = (TextView) itemView.findViewById(R.id.comment_userName_text);
            comment_content = (TextView) itemView.findViewById(R.id.comment_comment_text);
            comment_date = (TextView) itemView.findViewById(R.id.comment_date_text);

        }
    }

}

post数据模型：

public class R_PostModel {

    @SerializedName("id")
    public Integer id;
    @SerializedName("type")
    public String type;
    @SerializedName("slug")
    public String slug;
    @SerializedName("url")
    public String url;
    @SerializedName("status")
    public String status;
    @SerializedName("title")
    public String title;
    @SerializedName("title_plain")
    public String title_plain;
    @SerializedName("content")
    public String content;
    @SerializedName("excerpt")
    public String excerpt;
    @SerializedName("date")
    public String date;
    @SerializedName("modified")
    public String modified;
    @SerializedName("comment_count")
    public int comment_count;
    @SerializedName("comment_status")
    public String comment_status;
    @SerializedName("comments")
    public List<R_PostComment> comments;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public String getSlug() {
        return slug;
    }

    public void setSlug(String slug) {
        this.slug = slug;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public String getTitle() {
        return title;
    }

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

    public String getTitle_plain() {
        return title_plain;
    }

    public void setTitle_plain(String title_plain) {
        this.title_plain = title_plain;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public String getExcerpt() {
        return excerpt;
    }

    public void setExcerpt(String excerpt) {
        this.excerpt = excerpt;
    }

    public String getDate() {
        return date;
    }

    public void setDate(String date) {
        this.date = date;
    }

    public String getModified() {
        return modified;
    }

    public void setModified(String modified) {
        this.modified = modified;
    }

    public int getComment_count() {
        return comment_count;
    }

    public void setComment_count(int comment_count) {
        this.comment_count = comment_count;
    }

    public String getComment_status() {
        return comment_status;
    }

    public void setComment_status(String comment_status) {
        this.comment_status = comment_status;
    }

    public List<R_PostComment> getComments() {
        return comments;
    }

    public void setComments(List<R_PostComment> comments) {
        this.comments = comments;
    }

postShowModelResponse:

public class R_PostModelResponse {

    @SerializedName("status")
    public String status;
    @SerializedName("post")
    public List<R_PostModel> post;

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public List<R_PostModel> getPost() {
        return post;
    }

    public void setPost(List<R_PostModel> post) {
        this.post = post;
    }
}

同json:

{
    "status": "ok",
    "post": {
        "id": 2289,
        "type": "post",
        "slug": "11",
        "url": "http:\/\/site.com\/1393\/02\/12\/11\/",
        "status": "publish",
        "title": "Donec tempus urna risus",
        "title_plain": "Donec tempus urna risus",
        "content": "<p class=\"big\">Lorem ipsum dolor sit amet neque vitae mauris. Etiam malesuada ultricies. Nullam ut nunc odio eget volutpat a, rutrum ac, magna. Nulla facilisi. Nullam justo. Sed leo tristique senectus et ultrices sit amet, consectetuer adipiscing ornare. Nullam vulputate luctus. Nulla interdum libero. Maecenas tincidunt. Pellentesque dolor. In urna. Suspendisse sollicitudin. Vestibulum tempus purus fermentum imperdiet tincidunt, risus pede, luctus laoreet. Aenean ac eros quis eleifend congue. Nam dolor eget velit. Suspendisse at<\/p>\n<div class=\"column one-third\"><div class=\"quick_fact animate-math\"><div class=\"number-wrapper\"><span class=\"number\" data-to=\"35\">35<\/span><\/div><h3 class=\"title\">countries<\/h3><hr class=\"hr_narrow\" \/><div class=\"desc\">Donec vestibulum justo a diam ultricies pel lentesque. Quisque mattis diam vel lac.<\/div><\/div>\n<\/div>\n<div class=\"column one-third\"><div class=\"quick_fact animate-math\"><div class=\"number-wrapper\"><span class=\"number\" data-to=\"142\">142<\/span><\/div><h3 class=\"title\">articles<\/h3><hr class=\"hr_narrow\" \/><div class=\"desc\">Donec vestibulum justo a diam ultricies pel lentesque. Quisque mattis diam vel lac.<\/div><\/div>\n<\/div>\n<div class=\"column one-third\"><div class=\"quick_fact animate-math\"><div class=\"number-wrapper\"><span class=\"number\" data-to=\"89\">89<\/span><\/div><h3 class=\"title\">projects<\/h3><hr class=\"hr_narrow\" \/><div class=\"desc\">Donec vestibulum justo a diam ultricies pel lentesque. Quisque mattis diam vel lac.<\/div><\/div>\n<\/div>\n<div class=\"hr_dots\" style=\"margin: 0 auto 30px;\"><span><\/span><span><\/span><span><\/span><\/div>\n\n<p>Praesent odio ac turpis luctus eu, ornare varius, leo. Suspendisse sed metus. Class aptent taciti sociosqu ad litora torquent per inceptos hymenaeos. Sed sed est. Sed venenatis. Morbi tincidunt. Nullam justo. Vestibulum ut justo a odio. Etiam et pede eget metus nonummy at, rhoncus dolor in interdum pellentesque quis, lacinia aliquet. In mauris sit amet leo. Aliquam erat consectetuer vestibulum varius. Cras ut orci at lorem odio tellus hendrerit sed, congue fringilla.<\/p>\n<p>Class aptent taciti sociosqu ad litora torquent per inceptos hymenaeos. Maecenas vehicula, dui nulla, egestas sodales, augue commodo nec, ullamcorper ligula lorem odio sit amet, vestibulum wisi ultricies eu, magna. Fusce aliquet elit, gravida tellus tristique eget, porta eget, eros. In hac habitasse platea dictumst. Proin cursus magna. Sed placerat. Mauris vel risus. Nunc accumsan dictum, laoreet viverra. Cras tempus purus at risus auctor tincidunt. Sed sed tortor. In venenatis consequat. Donec iaculis. Curabitur est pretium wisi, sed leo. Sed tincidunt risus neque ultrices consectetuer. Etiam mollis ut, dolor. Maecenas.<\/p>\n",
        "excerpt": "<p>Donec tempus, urna risus nec mauris. Lorem ipsum primis in nulla ac arcu vitae augue. Vivamus nec elit a dui. Morbi id leo nec dui. Maecenas.<\/p>\n",
        "date": "\u06f1\u06f3\u06f9\u06f3-\u06f0\u06f2-\u06f1\u06f2 \u06f0\u06f9:\u06f3\u06f8:\u06f3\u06f1",
        "modified": "2014-05-02 09:38:31",
        "comments": [{
            "id": 10,
            "name": "&#1605;&#1581;&#1605;&#1583;",
            "url": "",
            "date": "2016-09-28 00:00:00",
            "content": "<p>&#1578;&#1587;&#1578; &#1662;&#1610;&#1575;&#1605; &#1575;&#1586; &#1587;&#1605;&#1578; &#1576;&#1585;&#1606;&#1575;&#1605;&#1607; &#1606;&#1608;&#1610;&#1587;&#1610;<\/p>\n",
            "parent": 0
        }, {
            "id": 11,
            "name": "Mohammad1",
            "url": "",
            "date": "2016-09-28 00:00:00",
            "content": "<p>Test Comment 1<\/p>\n",
            "parent": 0
        }, {

为了测试，我在 postShowActivity retrofit 响应中插入 Toast 消息，但 不显示此 Toast!

Toast.makeText(PostShow_page.this, "GoTo Adapter", Toast.LENGTH_SHORT).show();

更新： 运行申请时，不调用onResponse，调用onFailure!

如何解决这个问题并显示数据？

Answer 1

请尝试通过以下方式更改您的 R_PostModelResponse :

public class R_PostModelResponse {

    @SerializedName("status")
    public String status;
    @SerializedName("post")
    public R_PostModel post;

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public R_PostModel getPost() {
        return post;
    }

    public void setPost(R_PostModel post) {
        this.post = post;
    }
}

现在，请将您的 CommentAdapter2 class 更改为：

public class CommentAdapter2 extends RecyclerView.Adapter<CommentAdapter2.ViewHolder> {

    private R_PostModel mDataSet;
    private Context context;

    public CommentAdapter2(Context context,R_PostModel mDataSet) {
        this.mDataSet = mDataSet;
        this.context = context;
    }

    @Override
    public CommentAdapter2.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.comment_layout, viewGroup, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(CommentAdapter2.ViewHolder viewHolder, int position) {

        viewHolder.comment_name.setText(mDataSet.getComments().get(1).getCmName());
        viewHolder.comment_date.setText(mDataSet.getComments().get(4).getCmDate());
        viewHolder.comment_content.setText(mDataSet.getComments().get(3).getCmContent());


    }

    @Override
    public int getItemCount() {
        return 1;
    }

    public class ViewHolder extends RecyclerView.ViewHolder{

        private TextView comment_name, comment_content, comment_date;

        public ViewHolder(View view) {
            super(view);

            comment_name = (TextView) itemView.findViewById(R.id.comment_userName_text);
            comment_content = (TextView) itemView.findViewById(R.id.comment_comment_text);
            comment_date = (TextView) itemView.findViewById(R.id.comment_date_text);

        }
    }

}

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