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你好stackoverflow我有一個問題,這個項目我有「後」這是一個「父母」我需要項目內父 這是通過push方法生成的ID進行排序按時間順序如何按照時間順序從第一個到最老的像instagram一樣對父項進行排序Firebase
嘗試用這種方法:.orderByKey(),我已經閱讀文檔,並告訴我使用該方法,但它不工作
這是我的數據庫例如在一張照片中,很好地解釋了我需要訂購的東西 My database photo
這些是我使用的方法和參考文獻:
適配器方法:
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
我想這
mPostAdapter = new FirebaseRecyclerAdapter<Post, PostHolder>(
Post.class,
R.layout.row_post,
PostHolder.class,
FirebaseUtils.getPostRef().getParent().orderByKey
但這樣做不接收的數據中被渲染適配器填充視圖處理器
實用程序:
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(".", ","));