如何从POJO获取值并将值设置为TextView [英] How to get value from POJO and set value to TextView

问题描述

如何在Android Studio中从POJO获取值并将其值设置为TextView MainActivity.java onCreate方法:

How can I get value from POJO and set its value to TextView in android studio MainActivity.java onCreate method:

 FirebaseUser user=FirebaseAuth.getInstance().getCurrentUser();

 assert user != null;

 String UserID=user.getUid();
 UserInfoPOJO userinfopojo = new UserInfoPOJO(UserID);

UserInfoPOJO.java

public class UserInfoPOJO {

    private String UserID;

    public UserInfoPOJO(String userID) {
        UserID = userID;
    }

    public String getUserID() {
        return UserID;
    }

    public void setUserID(String userID) {
        UserID = userID;
    }
}

Main2Activity.java 的

onCreate 方法包含:

请在这里教我如何设置textview的值

onCreate method of Main2Activity.java contains:

please teach me how to set value to textview here

        userid1 = findViewById(R.id.op_uid);
        userinfopojo = (UserID);
        userid1.setText();

我试图制作的快照

这不包含在上面的问题中.

我想根据Uid存储数据

Snapshot of what I was trying to make

this is not included in the question above.

I want to store data according to Uid

推荐答案

如果bVVz ... i322是已登录用户的ID，请获取email，mobile和name的值.将UserInfoPOJO类更改为:

If the bVVz ... i322 is the id of the logged-in user, to get the values of email, mobile and name, please change the UserInfoPOJO class to:

class UserInfoPOJO {
    public String email, mobile, name;

    public UserInfoPOJO() {}
}

并且要将对象从数据库映射到类型为UserInfoPOJO的对象，请使用以下代码行:

And to map the object from the database to an object of type UserInfoPOJO, please use the following lines of code:

String uid = FirebaseAuth.getInstance().getCurrentUser().getUid();
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference uidRef = rootRef.child(uid);
ValueEventListener valueEventListener = new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        UserInfoPOJO userInfoPOJO = dataSnapshot.getValue(UserInfoPOJO.class);
        String email = userInfoPOJ.email;
        String mobile = userInfoPOJ.mobile;
        String name = userInfoPOJ.name;
        Log.d("TAG", email + "/" + mobile + "/" + name);
    }

    @Override
    public void onCancelled(@NonNull DatabaseError databaseError) {
        Log.d("TAG", databaseError.getMessage()); //Don't ignore errors!
    }
};
uidRef.addListenerForSingleValueEvent(valueEventListener);

您的logcat中的输出将是:

The output in your logcat will be:

[e-mail]/888888888/person name

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