我有问题 Custom Adapter with HorizontalScroll for ListView :
public class CNewsAdapter extends BaseAdapter {
private static ArrayList<News> listNews;
private LayoutInflater layoutInflater;
Context context;
public CNewsAdapter(Context fragment, ArrayList<News> results) {
listNews = results;
layoutInflater = LayoutInflater.from(fragment);
context = couponFragment;
}
@Override
public int getCount() {
return listNews.size();
}
@Override
public Object getItem(int position) {
return listNews.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = layoutInflater.inflate(R.layout.item_news, null);
holder.title = (TextView) convertView.findViewById(R.id.tv_news_title);
holder.text = (TextView) convertView.findViewById(R.id.tv_news_text);
holder.dateNTime = (TextView) convertView.findViewById(R.id.tv_news_time_difference);
holder.likesCount = (TextView) convertView.findViewById(R.id.tv_news_likes_count);
holder.newsLike = (AppCompatImageButton) convertView.findViewById(R.id.ib_news_heart_btn);
HorizontalScrollView hr = (HorizontalScrollView) convertView.findViewById(R.id.hs_news_scroll_photo);
// LinearLayout layout = (LinearLayout) convertView.findViewById(R.id.ll_news_photos);
LinearLayout layout = new LinearLayout(context);
for (int i = 0; i < listNews.get(position).getUrlPhotos().size(); i++) {
holder.image = new ImageView(context);
holder.image.setLayoutParams(new LinearLayoutCompat.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
layout.addView(holder.image);
Ion.with(holder.image).placeholder(R.drawable.ic_waiting).error(R.drawable.ic_error).load(listNews.get(position).getUrlPhotos().get(i).toString());
}
hr.addView(layout);
convertView = hr;
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.title.setText(listNews.get(position).getTitle());
holder.text.setText(listNews.get(position).getText());
holder.dateNTime.setText(listNews.get(position).getDifferenceTime());
holder.likesCount.setText(Integer.toString(listNews.get(position).getLikeCount()));
holder.newsLike.setImageResource(R.drawable.icon_heart_filled_20);
return convertView;
}
static class ViewHolder {
ImageView image;
public TextView title;
public TextView text;
public TextView dateNTime;
public TextView likesCount;
public AppCompatImageButton newsLike;
}
...和它的XML布局(相对布局):
> <?xml version="1.0" encoding="utf-8"?> <RelativeLayout
> xmlns:android="http://schemas.android.com/apk/res/android"
> android:layout_width="match_parent" android:layout_height="match_parent">
>
> <TextView
> android:layout_width="wrap_content"
> android:layout_height="wrap_content"
> android:textAppearance="?android:attr/textAppearanceMedium"
> android:text="News!"
> android:id="@+id/tv_news_title"
> android:layout_alignParentTop="true"
> android:layout_alignParentLeft="true"
> android:layout_alignParentStart="true" />
>
> <TextView
> android:layout_width="wrap_content"
> android:layout_height="wrap_content"
> android:textAppearance="?android:attr/textAppearanceSmall"
> android:text="News description"
> android:id="@+id/tv_news_text"
> android:layout_below="@+id/tv_news_title"
> android:layout_alignParentLeft="true"
> android:layout_alignParentStart="true" />
> <HorizontalScrollView
> android:id="@+id/hs_news_scroll_photo"
> android:layout_width="match_parent"
> android:layout_height="match_parent"
> android:layout_below="@+id/tv_news_text"
> android:layout_above="@+id/tv_news_likes_count"
> >
> <!-- <LinearLayout
> android:id="@+id/ll_news_photos"
> android:isScrollContainer="true"
> android:orientation="horizontal"
> android:layout_width="match_parent"
> android:layout_height="match_parent" />-->
> </HorizontalScrollView>
> <TextView
> android:layout_width="wrap_content"
> android:layout_height="wrap_content"
> android:textAppearance="?android:attr/textAppearanceMedium"
> android:text="Medium Text"
> android:id="@+id/tv_news_likes_count"
> android:layout_alignParentBottom="true"
> android:layout_toLeftOf="@+id/ib_news_heart_btn"
> android:layout_toStartOf="@+id/ib_news_heart_btn"
> android:layout_alignTop="@+id/ib_news_heart_btn"
> android:gravity="center_vertical|center_horizontal" />
>
> <android.support.v7.widget.AppCompatImageButton
> android:layout_width="40dp"
> android:layout_height="40dp"
> android:id="@+id/ib_news_heart_btn"
> android:layout_alignParentBottom="true"
> android:layout_alignParentRight="true"
> android:layout_alignParentEnd="true"
> android:contentDescription="Like it!" />
>
> <TextView
> android:layout_width="wrap_content"
> android:layout_height="wrap_content"
> android:textAppearance="?android:attr/textAppearanceSmall"
> android:text="How many time later"
> android:id="@+id/tv_news_time_difference"
> android:layout_alignParentTop="true"
> android:layout_alignParentRight="true"
> android:layout_alignParentEnd="true" /> </RelativeLayout>
支持片段包含我的列表视图:
class CNewsFragment extends Fragment {
ListView lv;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fr_c_news_layout, container, false);
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
lv = (ListView) view.findViewById(R.id.lv_news_main_list);
CNewsAdapter newsAdapter = new CNewsAdapter(view.getContext(), API.getListNews());
lv.setAdapter(newsAdapter);
newsAdapter.notifyDataSetChanged();
}
private class API {
public static ArrayList<News> getListNews() {
ArrayList<News> result = new ArrayList<>();
LinkedList<String> urlPhotos = new LinkedList<>();
urlPhotos.add("https://pp.vk.me/c625321/v625321630/40940/mrKdWrYpMYQ.jpg");
urlPhotos.add("https://pp.vk.me/c625321/v625321630/408ee/El-e0P99_jI.jpg");
urlPhotos.add("https://pp.vk.me/c625321/v625321630/40939/asXUtRC4r_8.jpg");
urlPhotos.add("https://pp.vk.me/c625321/v625321630/40940/mrKdWrYpMYQ.jpg");
News news = new News("uid1", "News 1!", "Description1", "2016-07-20T16:30:00.580", 103, true, urlPhotos);
result.add(news);
urlPhotos = new LinkedList<>();
urlPhotos.add("https://pp.vk.me/c625321/v625321630/40940/mrKdWrYpMYQ.jpg");
urlPhotos.add("https://pp.vk.me/c625321/v625321630/408ee/El-e0P99_jI.jpg");
urlPhotos.add("https://pp.vk.me/c625321/v625321630/40939/asXUtRC4r_8.jpg");
urlPhotos.add("https://pp.vk.me/c625321/v625321630/40940/mrKdWrYpMYQ.jpg");
news = new News("uid2", "News2!", "News Descript", "2016-07-20T16:30:00.580", 1000500, true, urlPhotos);
result.add(news);
return result;
}
}
}
如果我 grab 下一个例外:
E / AndroidRuntime:FATAL EXCEPTION:main java.lang.ClassCastException:android.widget.RelativeLayout $ LayoutParams无法强制转换为android.widget.AbsListView $ LayoutParams
在两个情况下(当在xml文件中使LinearLayout可见,并且可以通过ID查找时)我 grab :
E / AndroidRuntime:FATAL EXCEPTION:main java.lang.IllegalStateException:HorizontalScrollView只能在CNewsAdapter.getView(CNewsAdapter.java:68)的android.widget.HorizontalScrollView.addView(HorizontalScrollView.java:211)中托管一个直接子节点 .
What I have to do to make it work?
2 回答
解 . 我的问题在于属性
... HorizontalScrollView . 在案例3中,它初始化,但我没有看到 .
Problem :
在XML文件中,您已将
LinearLayout
添加了ll_news_photos
至H.S.V
.现在再次在
getView()
方法中尝试将另一个布局添加到H.S.V
. 这里扔了
Solution :
您应该将动态
LinearLayout
添加到所以在代码中它会
代替