使用 Firebase 适配器填充 ListView

Question

当我尝试使用 firebase 使用 firebase 适配器填充列表视图时收到这些错误 UI

com.google.firebase.database.DatabaseException: Failed to convert value of type java.util.HashMap to String com.google.firebase.database.DatabaseException: Class java.util.HashMap has generic type parameters, please use GenericTypeIndicator instead

这是代码

     DatabaseReference ref = FirebaseDatabase.getInstance().getReference();
     DatabaseReference a = ref.child("info");

        final FirebaseListAdapter<String> adapter =
              new FirebaseListAdapter<String>(this,String.class,android.R.layout.simple_list_item_1,a) {
                  @Override
                  protected void populateView(View v, String model, int position) {

                      TextView text = (TextView) findViewById(android.R.id.text1);
                      text.setText(model);

                  }

这里是json数据的例子

 "info" : {
   "KSTUJILdwPN305Fs7ujhga4knlG3" : {
     "File Info" : {
       "-JFRkA855rfOU7GtcK4" : {
         "Name" : "John",
         "Adress" : "Test Adress",
         "Favourite_food" : "Bread",
       },

Answer 1

final FirebaseListAdapter<String> adapter = new FirebaseListAdapter<String>(this,String.class,android.R.layout.simple_list_item_1,a)

public FirebaseListAdapter(Activity activity,
               java.lang.Class<T> modelClass,
               int modelLayout,
               com.firebase.client.Firebase ref)

modelClass - Firebase will marshall the data at a location into an instance of a class that you provide

将构造函数的第二个参数 (String.class) 替换为具有 info (name, address, favouriteFood) 字段的 POJO

FirebaseListAdapter

编辑：

您还应该在 populateView 方法中使用 getter

Answer 2

信息节点未引用您的数据模型。它可能包含子节点。所以要达到模型，你应该使用这样的参考。

 DatabaseReference a = ref.child("info").child(info_id).child("File Info").child(file_id);

你应该有一个 FileInfo 模型而不是 String 模型来使用

populateView(View v, FileInfo model, int position):

和型号

public class FileInfo {

private String Name;
private String Adress;
private String Favourite_food;

public FileInfo() {
}

public FileInfo(String Name, String Adress, String Favourite_food) {
    this.Name = Name;
    this.Adress = Adress;
    this.Favourite_food = Favourite_food;
}

public String getName() {
    return Name;
}

public void setName(String Name) {
    this.Name = Name;
}

public String getAdress() {
    return Adress;
}

public void setAdress(String Adress) {
    this.Adress = Adress;
}

public String getFavourite_food() {
    return Favourite_food;
}

public void setFavourite_food(String Favourite_food) {
    this.Favourite_food = Favourite_food;
}

}

使用 Firebase 适配器填充 ListView

Populate ListView with Firebase Adapter

java

android

listview

firebase-realtime-database

firebaseui