我正在使用android.support.v7.widget.CardView在ImageView中显示TextView两个RecyclerView但卡片视图未显示内容（仅显示空白白卡）当屏幕方向为垂直时，另一方面，当方向为风景时，它会显示内容。
当我从AndroidStudio运行相同的项目时，没有问题一切正常。
我不明白那里有什么问题，日食有问题吗？
请参阅以下代码，
PostListFragment
public class PostListFragment extends Fragment implements AppConfig {
private ArrayList<Post> mPostArrayList;
private PostRecyclerAdapter mPostRecyclerAdapter;
private RecyclerView mRecyclerView;
//other declarations
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//removed
}
private void init() {
// Set up RecyclerView
mRecyclerView = (RecyclerView) mRootView
.findViewById(R.id.mPostListRecyclerView);
// Setup layout manager for mPostArrayList and column count
final LinearLayoutManager mLayoutManager = new LinearLayoutManager(
getActivity());
// Control orientation of the mPostArrayList
mLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
mLayoutManager.scrollToPosition(0);
// Attach layout manager
mRecyclerView.setLayoutManager(mLayoutManager);
// Listen to the item touching
mRecyclerView.addOnItemTouchListener(new RecyclerItemClickListener(
getActivity(),
new RecyclerItemClickListener.OnItemClickListener() {
@Override
public void onItemClick(View itemView, int position) {
//some action
}
}));
mPostArrayList = new ArrayList<>();
// Bind adapter to recycler
mPostRecyclerAdapter = new PostRecyclerAdapter(
getActivity(), mPostArrayList);
mRecyclerView.setAdapter(mPostRecyclerAdapter);
}
private void getPosts() {
// Execute async task
new AsyncPosts().execute(mPostURL);
}
public class AsyncPosts extends AsyncTask<Object, String, JSONObject> {
//no problem with this
}
}
用于PostListFragment的布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/mParentLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<FrameLayout
android:id="@+id/mPostListContainer"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" >
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/mPostListSwipeRefreshLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<android.support.v7.widget.RecyclerView
android:id="@+id/mPostListRecyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.v4.widget.SwipeRefreshLayout>
</FrameLayout>
<!-- removed -->
</LinearLayout>
这是适配器来设置值， PostRecyclerAdapter
public class PostRecyclerAdapter extends
RecyclerView.Adapter<PostRecyclerAdapter.SimpleItemViewHolder> {
private Context mContext;
private List<Post> post;
// Provide a suitable constructor (depends on the kind of data store)
public PostRecyclerAdapter(Context context, List<Post> items) {
this.mContext = context;
this.post = items;
}
// Return the size of your data set (invoked by the layout manager)
@Override
public int getItemCount() {
return this.post.size();
}
// Create new items (invoked by the layout manager)
// Usually involves inflating a layout from XML and returning the holder
@Override
public SimpleItemViewHolder onCreateViewHolder(ViewGroup viewGroup,
int viewType) {
View itemView = LayoutInflater.from(viewGroup.getContext()).inflate(
R.layout.post_list_item, viewGroup, false);
return new SimpleItemViewHolder(itemView);
}
// Replace the contents of a view (invoked by the layout manager)
// Involves populating data into the item through holder
@Override
public void onBindViewHolder(SimpleItemViewHolder viewHolder, int position) {
Glide.with(mContext).load(post.get(position).IMG_URL)
.placeholder(R.drawable.ic_placeholder).crossFade(1000)
.centerCrop().into(viewHolder.mPostListSmallThumbnail);
viewHolder.mPostListSmallTitle.setText(post.get(position).POST_TITLE);
viewHolder.mPostListSmallContent
.setText(post.get(position).POST_CONTENT);
}
// Provide a reference to the views for each data item
// Provide access to all the views for a data item in a view holder
public final static class SimpleItemViewHolder extends
RecyclerView.ViewHolder {
ImageView mPostListSmallThumbnail;
TextView mPostListSmallTitle, mPostListSmallContent;
public SimpleItemViewHolder(View itemView) {
super(itemView);
mPostListSmallThumbnail = (ImageView) itemView
.findViewById(R.id.mPostListSmallThumbnail);
mPostListSmallTitle = (TextView) itemView
.findViewById(R.id.mPostListSmallTitle);
mPostListSmallContent = (TextView) itemView
.findViewById(R.id.mPostListSmallContent);
}
}
}
post_list_item
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/mPostListSmallCard"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:foreground="@drawable/card_background"
android:clickable="true"
app:cardCornerRadius="@dimen/blog_card_radius"
app:cardUseCompatPadding="true"
app:contentPadding="@dimen/blog_card_radius">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/mPostListSmallThumbnail"
android:layout_width="@dimen/blog_image_thumb_dim"
android:layout_height="@dimen/blog_image_thumb_dim"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:background="@drawable/ic_placeholder"
android:adjustViewBounds="true"
android:contentDescription="@string/image_thumbnail_placeholder" />
<TextView
android:id="@+id/mPostListSmallTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="@dimen/post_list_margin_left"
android:layout_marginStart="@dimen/post_list_margin_right"
android:layout_toEndOf="@+id/mPostListSmallThumbnail"
android:layout_toRightOf="@+id/mPostListSmallThumbnail"
android:ellipsize="end"
android:lines="2"
android:singleLine="false"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/mPostListSmallContent"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/mPostListSmallThumbnail"
android:layout_alignEnd="@+id/mPostListSmallTitle"
android:layout_alignLeft="@+id/mPostListSmallTitle"
android:layout_alignRight="@+id/mPostListSmallTitle"
android:layout_alignStart="@+id/mPostListSmallTitle"
android:layout_below="@+id/mPostListSmallTitle"
android:ellipsize="end"
android:lines="3"
android:textAppearance="?android:attr/textAppearanceSmall" />
</RelativeLayout>
</android.support.v7.widget.CardView>
这是横向布局的post_list_item 脊/ post_list_item
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/mPostListSmallCard"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginRight="@dimen/blog_card_margin_landscape"
android:layout_marginLeft="@dimen/blog_card_margin_landscape"
app:cardCornerRadius="@dimen/blog_card_radius"
app:cardUseCompatPadding="true">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/mPostListSmallThumbnail"
android:layout_width="@dimen/blog_image_thumb_dim"
android:layout_height="@dimen/blog_image_thumb_dim"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:adjustViewBounds="true"
android:contentDescription="@string/image_thumbnail_placeholder" />
<TextView
android:id="@+id/mPostListSmallTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="@dimen/post_list_margin_left"
android:layout_marginStart="@dimen/post_list_margin_right"
android:layout_toEndOf="@+id/mPostListSmallThumbnail"
android:layout_toRightOf="@+id/mPostListSmallThumbnail"
android:ellipsize="end"
android:lines="2"
android:singleLine="false"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/mPostListSmallContent"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/mPostListSmallThumbnail"
android:layout_alignEnd="@+id/mPostListSmallTitle"
android:layout_alignLeft="@+id/mPostListSmallTitle"
android:layout_alignRight="@+id/mPostListSmallTitle"
android:layout_alignStart="@+id/mPostListSmallTitle"
android:layout_below="@+id/mPostListSmallTitle"
android:ellipsize="end"
android:lines="3"
android:textAppearance="?android:attr/textAppearanceSmall" />
</RelativeLayout>
</android.support.v7.widget.CardView>