how to convert integer to string using typeconverters in room android? - android-room

Question

I am developing a chat app but I am getting the following error: Cannot find getter for the field.
that's why I want to convert Integer to String using type converters in Room but I did not find any sample below my User.java model class
#Entity public class User implements IChatUser {
#PrimaryKey(autoGenerate = true)
private Integer id;
#ColumnInfo(name = "name")
private String name;
#Ignore
Bitmap icon;
public User() {
}
#Ignore
public User(String name, Bitmap icon) {
this.name = name;
this.icon = icon;
}
#Override
public Integer getId() {
return this.id;
}
#Override
public String getName() {
return this.name;
}
public void setId(Integer id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
#Override
public Bitmap getIcon() {
return this.icon;
}
#Override
public void setIcon(Bitmap icon) {
this.icon = icon;
} }
below IchatUser.kt
interface IChatUser {
fun getId(): String
fun getName(): String?
fun getIcon(): Bitmap?
fun setIcon(bmp: Bitmap)
}

Answer 1

To create a #TypeConverter create a java class and call it IntConverter
public class IntConverter {
#TypeConverter
public static String toString(int number) {
return number == null ? null : Integer.toString(number);
}
#TypeConverter
public static int toInt(String str) {
return str == null ? null : Integer.parseInt(str);
}
}
Now you need the database to know about this TypeConverter so declare this:
#TypeConverters(IntConverter.class)
Just below the #Database annotation in the Database class