Android 如何从Firestore检索数组?
我使用数组数据结构来保存一些信息,如图所示 UserInfo.javaAndroid 如何从Firestore检索数组?,android,firebase,google-cloud-firestore,Android,Firebase,Google Cloud Firestore,我使用数组数据结构来保存一些信息,如图所示 UserInfo.java public class UserInfo { private String userId, age, height; public UserInfo(String userId, String age, String height) { this.userId = userId; this.age = age; this.height = height; } public String getUs
public class UserInfo {
private String userId, age, height;
public UserInfo(String userId, String age, String height) {
this.userId = userId;
this.age = age;
this.height = height;
}
public String getUserId() {
return userId;
}
public String getAge() {
return age;
}
public String getHeight() {
return height;
}
}
public class UserInfo {
private String age;
private String height;
private String userId;
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getHeight() {
return height;
}
public void setHeight(String height) {
this.height = height;
}
public String getUserId() {
return userId;
}
public void setUserId(String userId) {
this.userId = userId;
}
}
如何获取array1和array2并将其保存为UserInfo对象?
因为我想在Recyclerview中填充数组 您可以从
用户
集合中查询文档,然后获取信息
数组。对于数组中的每个条目,将其映射到UserInfo
对象。然后将每个UserInfo
对象插入新集合UserInfo
。现在,您可以查询UserInfo
collection,并在回收器视图中显示结果
以下是如何从Cloud Firestore进行查询:
有关如何将数据添加到UserInfo集合的参考:
希望这有帮助。首先,您必须检索文档的内容 成功检索DocumentSnapshot后,从中获取Java对象,并使用Gson将对象转换为Json 然后您可以解析Json并生成用户列表。现在您可以在recyclerview中填充列表
FirebaseFirestore db;
List<UserInfo> userList;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_name);
db = FirebaseFirestore.getInstance();
userList = new ArrayList<>();
DocumentReference docRef = db.collection("users").document("h3cj5y....");// you can use your own here
docRef.get().addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() {
@Override
public void onSuccess(DocumentSnapshot documentSnapshot) {
Object object = documentSnapshot.getData();
String json = new Gson().toJson(object);
Log.v("json",json);
try {
JSONObject infoObj=new JSONObject(json).getJSONObject("info");
Iterator<String> iterator = infoObj.keys();
while (iterator.hasNext()) {
String key = iterator.next();
JSONObject objArray=infoObj.getJSONObject(key);
UserInfo user=new UserInfo();
user.setAge(objArray.getString("age"));
user.setHeight(objArray.getString("height"));
user.setUserId(objArray.getString("userId"));
userList.add(user);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
});
}
谢谢,我成功地完成了每个循环,并在HashMap中获得了数组,但我无法将其转换为UserInfo对象。我该怎么做?