Firebase-用户对事物的评论 [英] Firebase - users comment on things

问题描述

我正在构建一个Android应用，该应用允许用户在广告牌前100名中的每首歌曲上进行评论(我从JSON fie解析了该信息).我该如何存储注释(最好使用Firebase)，并在做出新注释后显示并刷新它们?

I am building an android app that allows users to comment on each song on the billboard top 100 (I parsed that info from a JSON fie). How would I go about storing the comments (preferably using Firebase) and displaying and refreshing them after a new comment is made?

推荐答案

我假设每首歌曲都有一个唯一的ID.因此，对于每首歌曲，您可以做的是-

I am assuming there is a unique ID for each song. So for each song what you can do is-

1. 获取歌曲参考

1. Get the song reference

private DatabaseReference mDatabase;

mDatabase = FirebaseDatabase.getInstance().getReference();

mSongRef = mDatabase.child("SongID");

每当有人评论一首歌时，将Comment类的对象push()作为该歌的子节点:

Whenever someone comment on a song, push() the object of Comment class as child node of that song:

String commentKey = mSongRef.push().getKey();
mSongRef.child(commentKey).setValue(comment);

现在获取新添加的评论

Now to fetch the newly added comment

mSongRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {

    Comment comment = dataSnapshot.getValue(Comment.class);

    Log.d(TAG, "Comment: " + comment.getCommentText() + ", User: " + comment.getUsername());
}

@Override
public void onCancelled(DatabaseError error) {
// Failed to read value
    Log.w(TAG, "Failed to read value.", error.toException());
}});

现在您有了最新数据，可以将注释添加到列表中并更新回收站/列表视图.

Now that you have recent data, you can add the comment to your list and update recycler/list view.

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