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===============================================================================
lists_secrets_single.xml
================================================================================


<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    >


    <ImageView
        android:layout_width="match_parent"
        android:layout_height="290dp"
        android:src="@drawable/left"
        android:id="@+id/imgBubble"/>

    <TextView
        android:layout_width="300dp"
        android:layout_height="170dp"
        android:text="this is a sample text"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="30dp"
        android:id="@+id/txtMsgp"
        android:textSize="20sp"/>

    <LinearLayout
        android:layout_width="300dp"
        android:layout_height="35dp"
        android:layout_below="@id/txtMsgp"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp"
        android:gravity="center">

    </LinearLayout>

</RelativeLayout>



=========================================================================
Users.java
=====================================================

public class Users {

    public String userEmail;
    public String userName;
    public String userPass;
    public String uuid;
    public String userAge;
    public String userNumber;
    public String userGender;

    public Users() {
    }

    public Users(String userEmail, String userName, String userPass, String uuid, String userAge, String userNumber, String userGender) {
        this.userEmail = userEmail;
        this.userName = userName;
        this.userPass = userPass;
        this.uuid = uuid;
        this.userAge = userAge;
        this.userNumber = userNumber;
        this.userGender = userGender;
    }


    public void saveUser() {
        Users user = new Users(userEmail, userName, userPass, uuid, userAge, userNumber, userGender);
        FirebaseDatabase database = FirebaseDatabase.getInstance();
        DatabaseReference myRef = database.getReference("Users");
        myRef.child(uuid).setValue(user);
    }

}
==================================================================================