如何在 TextView 中显示 UUID？

Question

I would like to display a unique code like a uuid generated using mysql in a TextView .

After creating my database table and using a trigger to create uuid , I was able to successfully generate a json object and implement in android studio using retrofit . However, I am able to display all json data from mysql in TextView but not the uuid code. The TextView shows blank.

activity_main.xml

<androidx.cardview.widget.CardView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="@dimen/spacing_medium"
            android:layout_marginTop="@dimen/spacing_medium"
            android:visibility="visible"
            app:cardCornerRadius="0dp"
            app:cardElevation="2dp">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@android:color/white"
                    android:gravity="center_vertical"
                    android:minHeight="?attr/actionBarSize"
                    android:orientation="horizontal">

                    <View
                        android:layout_width="@dimen/spacing_smlarge"
                        android:layout_height="wrap_content" />

                    <TextView
                        android:layout_width="0dp"
                        android:layout_height="wrap_content"
                        android:layout_weight="1"
                        android:text="Unique Code"
                        android:textAppearance="@style/TextAppearance.AppCompat.Subhead"
                        android:textColor="@color/grey_80" />

                    <TextView
                        android:id="@+id/unique_code"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:padding="@dimen/spacing_large"
                        android:text="CXDT2887A"
                        android:textAppearance="@style/Base.TextAppearance.AppCompat.Title"
                        android:textColor="@color/colorAccent" />

                    <ImageButton
                        android:id="@+id/bt_copy_code"
                        android:layout_width="?attr/actionBarSize"
                        android:layout_height="?attr/actionBarSize"
                        android:background="?attr/selectableItemBackgroundBorderless"
                        android:tint="@color/grey_60"
                        app:srcCompat="@drawable/ic_content_copy" />

                </LinearLayout>

            </LinearLayout>

        </androidx.cardview.widget.CardView>

User.java

public class User {
private int id;
private String uuid;
private String email;
private String firstname;
private String lastname;
private String companyname;
private String postcode;
private String city;
private String state;
private String phonenumber;
private String address;
private String country;
private String status;
private int currency;
private String language;
private int email_verified;
private String photo;



public User(int id, String uuid, String email, String firstname, String lastname, String companyname, String address, String city,
            String state, String postcode, String country, String phonenumber, String status, int currency,
            String language, int email_verified, String photo) {

    this.id = id;
    this.uuid = uuid;
    this.email = email;
    this.firstname = firstname;
    this.lastname = lastname;
    this.companyname = companyname;
    this.address = address;
    this.city = city;
    this.state = state;
    this.postcode = postcode;
    this.country = country;
    this.phonenumber = phonenumber;
    this.status = status;
    this.currency = currency;
    this.language = language;
    this.email_verified = email_verified;
    this.photo = photo;


}

public int getId() {
    return id;
}
public String getUuid() {
    return uuid;
}
public String getEmail() {
    return email;
}
public String getFirstName() {
    return firstname;
}
public String getLastName() {
    return lastname;
}
public String getCompanyName() { return companyname; }
public String getAddress() {
    return address;
}
public String getCity() {
    return city;
}
public String getState() { return state; }
public String getPostcode() {
    return postcode;
}
public String getCountry() {
    return country;
}
public String getPhonenumber() {
    return phonenumber;
}
public String getStatus() { return status; }
public int getCurrency() { return currency; }
public String getLanguage() {
    return language;
}
public int getEmail_verified() { return email_verified; }
public String getPhoto() {
    return photo;
}


}

MainActivity.java

tv_unique_code = (TextView) findViewById(R.id.unique_code);
    bt_copy_code = (ImageButton) findViewById(R.id.bt_copy_code);
    bt_copy_code.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Tools.copyToClipboard(getApplicationContext(), tv_unique_code.getText().toString());
        }
    });

    tv_unique_code.setText(SharedPrefManager.getInstance(MainActivity.this).getUser().getUuid());

    parent_view = findViewById(android.R.id.content);

Answer 1

if you are loading the object with a string from:

String myId = UUID.randomUUID().toString();

You can set the textview to the id by:

Textview displayId= (TextView) findViewById(R.id.display_id);
displayId.setText(User.getId());

Hope that answered your question, if not please provide more code of the activity :)