的好友列表片段
public class FriendsFragment extends Fragment {
private RecyclerView mFriendList;
private DatabaseReference mFriendsDatabase;
private FirebaseAuth mAuth;
private String mCurrent_user_id;
private View mMainView;
private String user_id;
public FriendsFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
mMainView = inflater.inflate(R.layout.fragment_friends, container, false);
mFriendList = (RecyclerView) mMainView.findViewById(R.id.listfriends);
mCurrent_user_id = mAuth.getCurrentUser().getUid();
//路径
mFriendsDatabase = FirebaseDatabase.getInstance().getReference().child("Friends").child(mCurrent_user_id);
//循环查看
mFriendList.setHasFixedSize(true);
mFriendList.setLayoutManager(new LinearLayoutManager(getContext()));
//返回主视图
return mMainView;
}
//在开始
@Override
public void onStart() {
super.onStart();
FirebaseRecyclerOptions<Friends> options =
new FirebaseRecyclerOptions.Builder<Friends>()
.setQuery(mFriendsDatabase,Friends.class)
.setLifecycleOwner(this)
.build();
FirebaseRecyclerAdapter<Friends, FriendsViewHolder> friendsRecyclerViewAdapter = new FirebaseRecyclerAdapter<Friends, FriendsViewHolder>(options){
@NonNull
@Override
public FriendsViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
return new FriendsViewHolder(LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.friendlist, viewGroup, false));
}
@Override
protected void onBindViewHolder(@NonNull FriendsViewHolder holder, int position, @NonNull Friends model) {
holder.setDate(model.getDate());
//Will get data from user choosen
//final String user_id = getRef(position).getKey();
}
};
mFriendList.setAdapter(friendsRecyclerViewAdapter);
}
//方法结束调用onStart
public static class FriendsViewHolder extends RecyclerView.ViewHolder{
View mView;
public FriendsViewHolder(@NonNull View itemView) {
super(itemView);
mView = itemView;
}
public void setDate(String date){
TextView dateOfFriend=(TextView) mView.findViewById(R.id.friend_single_status);
dateOfFriend.setText(date);
}
}
}
//友类我走到哪里得到字符串数据
public class Friends {
public String date;
public Friends(){
}
public Friends(String date) {
this.date = date;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
}
火力地堡数据库结构的图像:
我不知道是什么问题。我是新Android上。
你是不是设置了RecyclerView适配器。
mRV.setLayoutManager(new LinearLayoutManager(getContext());
mRV.setAdapter(new MyAdapterRV());
你在你在onStart()方法的适配器。让全球公众即,添加行onCreateView()
mFriendList.setAdapter(friendsRecyclerViewAdapter);
更多关于回收站浏览次数:在Android中,如果你想显示一个长长的清单,你可以使用回收视图。一个RecyclerView将膨胀(创建)子视图和管理向上滚动和向下列表。回收者视图需要4件事情: