Firebase查询结果在ListView UI和RecyclerView UI中 [英] Firebase query result in ListView UI and RecyclerView UI

问题描述

我尝试创建一个Firebase数据库来存储员工信息，然后在查询地址时，留在特定区域的所有员工都应该显示在ListView或RecyclerView中，但是我遇到以下问题：

我无法填充ListView。

  ArrayList< String> mItems = new ArrayList<>（）; 
 ArrayAdapter mAdapter; 
 ListView mRecyclerView; 
 
 FirebaseListAdapter< String> fireAdapter = new FirebaseListAdapter< String>（）{
 @Override 
 protected void populateView（View view，String s）{
 //填充视图
} 
}; 
  

在上面的代码中，我无法写出构造函数，

  FirebaseListAdapter< String> fireAdapter = new FirebaseListAdapter< String>（this，String.class，
 android.R.layout.simple_list_item_1，mEmployRef）{
 @Override 
 protected void populateView（View view，String s）{ 
 //填充视图
} 
}; 
  

当我用构造函数写上面的代码时，它说：

无法解析构造函数'FirebaseListAdapter（anonymous android.view.View.OnClickListener，java.lang.Class，int，com.google.firebase.database.DatabaseReference）'

我如何解决这个问题？当我尝试使用RecyclerView时，会出现类似的问题。

解决方案

当Firebase升级时，我遇到了这个问题，取出构造函数的错误是改变这一点：

  Firebase rootRef = new Firebase（https：//< your-app> ; .firebaseio.com /）; 
  

对此：

  DatabaseReference rootRef = FirebaseDatabase.getInstance（）。getReference（）; 
  

然后使用rootRef作为构造函数的第四个参数。

这里是从以前的firebase升级到当前的链接：
https://firebase.google.com/support/guides/firebase-android#import_your_project_to_the_new_firebase_console_numbered

另外，升级您的sdk。希望这可以解决您的问题

I am trying to create a Firebase database to store employee information and then when an address is queried, all the employees staying in that particular area should be displayed in a ListView or a RecyclerView however, I am having the following problem:

I am unable to populate the ListView.

    ArrayList<String> mItems = new ArrayList<>();
    ArrayAdapter mAdapter;
    ListView mRecyclerView;

    FirebaseListAdapter<String> fireAdapter = new FirebaseListAdapter<String>() {
            @Override
            protected void populateView(View view, String s) {
             //populate view
            }
        };

In the above code, I am unable to write the constructor so that it becomes,

    FirebaseListAdapter<String> fireAdapter = new FirebaseListAdapter<String>(this,String.class,
                android.R.layout.simple_list_item_1,mEmployRef) {
            @Override
            protected void populateView(View view, String s) {
                //populate view
            }
        }; 

When I write the above code with the constructor, it says,

Cannot resolve constructor 'FirebaseListAdapter(anonymous android.view.View.OnClickListener, java.lang.Class, int, com.google.firebase.database.DatabaseReference)'

How do I resolve this? A similar problem occurs when I try to use a RecyclerView.

解决方案

I was having this problem when Firebase upgraded and what i did to get out of the constructor error was change this:

Firebase rootRef = new Firebase("https://<your-app>.firebaseio.com/");

to this:

DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();

then use the rootRef as the fourth parameter on the constructor.

here is a link for upgrading from the previous firebase to the current: https://firebase.google.com/support/guides/firebase-android#import_your_project_to_the_new_firebase_console_numbered

Also, upgrade your sdk. Hope this solves your problem

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