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你好stackoverflow我有一个问题,这个项目我有“后”这是一个“父母”我需要项目内父 这是通过push方法生成的ID进行排序按时间顺序如何按照时间顺序从第一个到最老的像instagram一样对父项进行排序Firebase
尝试用这种方法:.orderByKey(),我已经阅读文档,并告诉我使用该方法,但它不工作
这是我的数据库例如在一张照片中,很好地解释了我需要订购的东西 My database photo
这些是我使用的方法和参考文献:
适配器方法:
private void setupAdapter() {
mPostAdapter = new FirebaseRecyclerAdapter<Post, PostHolder>(
Post.class,
R.layout.row_post,
PostHolder.class,
FirebaseUtils.getPostRef().orderByKey()
) {
@Override
protected void populateViewHolder(final PostHolder viewHolder, final Post model, int position) {
Post mPost = new Post();
viewHolder.setNumComments(String.valueOf(model.getNumComments()));
viewHolder.setNumLikes(String.valueOf(model.getNumLikes()));
viewHolder.setNumDislikes(String.valueOf(model.getNumDislikes()));
viewHolder.setTime(DateUtils.getRelativeTimeSpanString(model.getTimeCreated()));
viewHolder.postOwnerUsernameTextView.setText(model.getUsername());
if(viewHolder.postOwnerUsernameTextView == null){
viewHolder.postOwnerUsernameTextView.setText("Anonymous");
}
viewHolder.setPostText(model.getPostText());
final StorageReference storageReference = FirebaseStorage.getInstance()
.getReference(model.getPostImageUrl());
Glide.with(getActivity())
.using(new FirebaseImageLoader())
.load(storageReference).into(viewHolder.postDisplayImageView); ... remainder of code
我想这
mPostAdapter = new FirebaseRecyclerAdapter<Post, PostHolder>(
Post.class,
R.layout.row_post,
PostHolder.class,
FirebaseUtils.getPostRef().getParent().orderByKey
但这样做不接收的数据中被渲染适配器填充视图处理器
实用程序:
public static DatabaseReference getPostRef() {
return FirebaseDatabase.getInstance()
.getReference("posts");
}
public static Query getPostQuery() {
return getPostRef().orderByChild("timeCreated");
}
public static DatabaseReference getMyPostRef() {
return FirebaseDatabase.getInstance().getReference("myPosts")
.child(getCurrentUser().getEmail().replace(".", ","));