Question

我想使用CardView显示一些新闻（可以折叠和展开）。默认情况下，CardView不会展开，因此仅显示新闻标题。但如果展开，可以看到WebView，显示新闻页面。

到目前为止，这些是我的代码：`

News.java

public class News {

private String title;
private String url;

public News(){
    this("", "");
}

public News(String title, String url){
    this.title = title;
    this.url = url;
}

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

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

public String getTitle(){
    return title;
}

public String getUrl(){
    return url;
}
}

` 的 NewsViewHolder.java

public class NewsViewHolder extends RecyclerView.ViewHolder {
    public TextView newsTitle;
    public WebView newsContent;

    public NewsViewHolder(View itemView){
        super(itemView);
        newsTitle = (TextView) itemView.findViewById(R.id.news_title);
        newsContent = (WebView) itemView.findViewById(R.id.news_web_content);
    }
}

NewsListAdapter.java

public class NewsListAdapter extends RecyclerView.Adapter<NewsViewHolder> {

private final List<News> newsList;

public NewsListAdapter(List<News> newsList) {
    this.newsList = newsList;
}

@Override
public NewsViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
    final LayoutInflater layoutInflater = LayoutInflater.from(viewGroup.getContext());
    final View v = layoutInflater.inflate(R.layout.news_card, viewGroup, false);
    return new NewsViewHolder(v);
}

@Override
public void onBindViewHolder(NewsViewHolder holder, int i) {
    holder.newsTitle.setText(newsList.get(i).getTitle());
    holder.newsContent.loadUrl(newsList.get(i).getUrl());
}

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

NewsFragment.java

public class NewsFragment extends Fragment {

private RecyclerView recView;

public static NewsFragment newInstance(String param1, String param2){
    NewsFragment fragment = new NewsFragment();
    return fragment;
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    View view = inflater.inflate(R.layout.fragment_news, container, false);
    recView = (RecyclerView) view.findViewById(R.id.news_list);
    recView.setLayoutManager(new LinearLayoutManager(getActivity()));

    ((AppCompatActivity)getActivity()).getSupportActionBar().setTitle("News");

    List<News> dummyNews = new ArrayList<News>();
    for (int x = 1; x <= 5; x++){
        News news = new News("News #"+x, "file:///android_asset/www/dummy.html");
        dummyNews.add(news);
    }

    recView.setAdapter(new NewsListAdapter(dummyNews));
    return view;
}
}

`

news_card.xml

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="@dimen/card_padding"
    tools:background="#22000000">

    <TextView
        android:id="@+id/news_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="@dimen/default_margin_padding"
        android:textSize="@dimen/quiz_question_text_size" />

    <WebView
        android:id="@+id/news_web_content"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />


    <!-- dummy sharing buttons -->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:textSize="16sp"
            android:text="WhatsApp"
            tools:ignore="HardcodedText" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:textSize="16sp"
            android:text="E-mail"
            tools:ignore="HardcodedText" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:textSize="16sp"
            android:text="Facebook"
            tools:ignore="HardcodedText" />
    </LinearLayout>
</LinearLayout>

所有新闻都正确显示。现在的问题是：

如何在CardView右侧添加按钮，以启用折叠/展开？
折叠时，只显示新闻标题。

怎么办？或者是否有符合我要求的第三方CardView库？谢谢。

Answer 1

您可以放置一个按钮，点击该按钮，我可以看到GONE的新闻详细信息。它将隐藏新闻详细信息，仅显示新闻标题。要使布局动画，请使用> row.names(mydataframe) [1] "1_S1_annotated_filtered.vcf.gz1" "1_S1_annotated_filtered.vcf.gz2" "1_S1_annotated_filtered.vcf.gz3" "1_S1_annotated_filtered.vcf.gz6" [5] "1_S1_annotated_filtered.vcf.gz7" "1_S1_annotated_filtered.vcf.gz8" ... [457] "6_S6_annotated_filtered.vcf.gz877" "6_S6_annotated_filtered.vcf.gz888" "6_S6_annotated_filtered.vcf.gz907" "7_S7_annotated_filtered.vcf.gz309" [461] "7_S7_annotated_filtered.vcf.gz354" "7_S7_annotated_filtered.vcf.gz477" "7_S7_annotated_filtered.vcf.gz485" "7_S7_annotated_filtered.vcf.gz537" [465] "7_S7_annotated_filtered.vcf.gz569" "7_S7_annotated_filtered.vcf.gz575" "7_S7_annotated_filtered.vcf.gz721" "7_S7_annotated_filtered.vcf.gz871" [469] "7_S7_annotated_filtered.vcf.gz892" "8_S8_annotated_filtered.vcf.gz136" "8_S8_annotated_filtered.vcf.gz191" "8_S8_annotated_filtered.vcf.gz967"到新闻详细信息文本视图的父ViewGroup（LinearLayout或RelativeLayout或任何）。这将为textView的可见性更改设置动画。

在CardView上启用折叠和扩展

1 个答案: