1. 技术文章
  2. FirebaseUI with RecycleView

FirebaseUI with RecycleView

由 纵饮孤独 提交于 2019-12-01 14:49:43

To solve this, please follow the next steps:

  1. change your model to look like this:

    public class Places {
    private String image, name;

    public Places() { }

    public Places(String image, String name) {
        this.image = image;
        this.name = name;
    }

    public String getImage() { return image; }
    public String getName() { return name; }
}

    The fields from your model class should look exactly like the one from your database. In your code are different. See name_place vs. name.

  2. Make your firebaseRecyclerAdapter varaible global:

    private FirebaseRecyclerAdapter<Places, PlaceViewHolder> firebaseRecyclerAdapter;

  3. Remove FirebaseRecyclerAdapter<Places, PlaceViewHolder> from the onCreate() method.

  4. Add the following lines of code in the onStart() and onStop() methods.

    @Override
protected void onStart() {
    super.onStart();
    firebaseRecyclerAdapter.startListening();
}

@Override
protected void onStop() {
    super.onStop();
    if(firebaseRecyclerAdapter != null) {
        firebaseRecyclerAdapter.stopListening();
    }
}

This is a complete example on how you can retrieve data from a Firebase Realtime database and display it in a RecyclerView using FirebaseRecyclerAdapter.

Edit:

To simply display those names in the logcat, please use the following code:

DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference usersRef = rootRef.child("Users");
ValueEventListener valueEventListener = new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        for(DataSnapshot ds : dataSnapshot.getChildren()) {
            String name = ds.child("name").getValue(String.class);
            Log.d("TAG", name);
            Toast.makeText(getApplicationContext(), name, Toast.LENGTH_SHORT).show());
        }
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {}
};
usersRef.addListenerForSingleValueEvent(valueEventListener);
标签
android
firebase
firebase-realtime-database
firebaseui
易学教程内所有资源均来自网络或用户发布的内容，如有违反法律规定的内容欢迎反馈！
该文章没有解决你所遇到的问题?点击提问,说说你的问题,让更多的人一起探讨吧!