How di I turn my class into an Entity in Room Persistence? - android-room

Question

This is my first time using Room Persistence Library and I am having difficulties understanding the concept of entity.
So I have these two classes:
public class CapturedTime
{
#SerializedName("startTime")
#Expose
private Long startTime;
#SerializedName("endTime")
#Expose
private Long endTime;}
and
public class CapturedItem implements Parcelable {
private String serialNumber;
private CapturedTime firstCapturedTime;
private CapturedTime secondCapturedTime;}
I believe it's pretty straightforward for the CapturedTime class but I have no idea what I should do for the CapturedItem class. Can I just make the CapturedTime variables into columns or are there steps that I should do first?

Answer 1

First add dependency in buid.gradle file
dependencies {
def room_version = "2.1.0-rc01"
implementation "androidx.room:room-runtime:$room_version"
annotationProcessor "androidx.room:room-compiler:$room_version" // For Kotlin use kapt instead of annotationProcessor
}
After that use #Entity annotation to declare normal POJO class as entity in Room persistence library.
#Entity(tableName = "your_table_name")
public class CapturedTime{
#SerializedName("startTime")
#Expose
#ColumnInfo(name = "start_time")
private long startTime;
#SerializedName("endTime")
#Expose
#ColumnInfo(name = "end_time")
private long endTime;
}
#ColumnInfo used to declare column name in table, by default column name is variable name if you do't provide #ColumnInfo annotation
If you want to store custom object in room you use
#TypeConverters() annotation
In your case,
#TypeConverters(CapturedTime.class)
private CapturedTime firstCapturedTime;
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