How can I make my custom objects Parcelable

Question

I m trying to make my objects Parcelable  However  I have custom objects and those objects have ArrayList attributes of other custom objects I have made   What would be the best way to do this

User · Answer

Now you can use Parceler library to convert your any custom class in parcelable. Just annotate your POJO class with @Parcel. e.g.

    @Parcel
    public class Example {
    String name;
    int id;

    public Example() {}

    public Example(int id, String name) {
        this.id = id;
        this.name = name;
    }

    public String getName() { return name; }

    public int getId() { return id; }
}

you can create an object of Example class and wrap through Parcels and send as a bundle through intent. e.g

Bundle bundle = new Bundle();
bundle.putParcelable("example", Parcels.wrap(example));

Now to get Custom Class object just use

Example example = Parcels.unwrap(getIntent().getParcelableExtra("example"));

User · Answer

Android parcable has some unique things  Those are given bellow    You have to read Parcel as the same order where you put data on parcel  Parcel will empty after read from parcel  That is if you have 3 data on your parcel  Then after read 3 times parcel will be empty    Example  To make a class Parceble it must be implement Parceble  Percable has 2 method   int describeContents    void writeToParcel Parcel var1  int var2     Suppose you have a Person class and it has 3 field  firstName lastName and age  After implementing Parceble interface  this interface is given bellow   import android os Parcel  import android os Parcelable  public class Person implements Parcelable      private String firstName      private String lastName      private int age       public void setFirstName String firstName            this firstName   firstName             public String getFirstName             return firstName             public void setLastName String lastName            this lastName   lastName             public String getLastName             return lastName             public void setAge int age            this age   age             public int getAge             return age              Override     public int describeContents             return 0              Override     public void writeToParcel Parcel parcel  int i            parcel writeString firstName           parcel writeString lastName           parcel writeInt age              Here writeToParcel method we are writing adding data on Parcel in an order  After this we have to add bellow code for reading data from parcel   protected Person Parcel in            firstName   in readString            lastName   in readString            age   in readInt               public static final Creator lt Person gt  CREATOR   new Creator lt Person gt               Override         public Person createFromParcel Parcel in                return new Person in                       Override         public Person   newArray int size                return new Person size                      Here   Person class is taking a parcel and getting data in same an order during writing   Now during intent getExtra and putExtra code is given bellow   Put in Extra   Person person new Person                    person setFirstName  First                    person setLastName  Name                    person setAge 30                    Intent intent   new Intent getApplicationContext    SECOND ACTIVITY class                   intent putExtra                   startActivity intent      Get Extra   Person person getIntent   getParcelableExtra  person      Full Person class is given bellow   import android os Parcel  import android os Parcelable   public class Person implements Parcelable      private String firstName      private String lastName      private int age         public void setFirstName String firstName            this firstName   firstName             public String getFirstName             return firstName             public void setLastName String lastName            this lastName   lastName             public String getLastName             return lastName             public void setAge int age            this age   age             public int getAge             return age              Override     public int describeContents             return 0              Override     public void writeToParcel Parcel parcel  int i            parcel writeString firstName           parcel writeString lastName           parcel writeInt age              protected Person Parcel in            firstName   in readString            lastName   in readString            age   in readInt               public static final Creator lt Person gt  CREATOR   new Creator lt Person gt               Override         public Person createFromParcel Parcel in                return new Person in                       Override         public Person   newArray int size                return new Person size                        Hope this will help you  Thanks

User · Answer

You can find some examples of this here  here  code is taken here   and here   You can create a POJO class for this  but you need to add some extra code to make it Parcelable  Have a look at the implementation   public class Student implements Parcelable          private String id          private String name          private String grade              Constructor         public Student String id  String name  String grade               this id   id              this name   name              this grade   grade                     Getter and setter methods                                              Parcelling part        public Student Parcel in              String   data   new String 3               in readStringArray data                 the order needs to be the same as in writeToParcel   method            this id   data 0              this name   data 1              this grade   data 2                      verride        public int describeContents               return 0                    Override        public void writeToParcel Parcel dest  int flags               dest writeStringArray new String    this id                                                 this name                                                 this grade                    public static final Parcelable Creator CREATOR   new Parcelable Creator                public Student createFromParcel Parcel in                   return new Student in                             public Student   newArray int size                   return new Student size                                 Once you have created this class  you can easily pass objects of this class through the Intent like this  and recover this object in the target activity   intent putExtra  student   new Student  1   Mike   6       Here  the student is the key which you would require to unparcel the data from the bundle   Bundle data   getIntent   getExtras    Student student    Student  data getParcelable  student      This example shows only String types  But  you can parcel any kind of data you want  Try it out   EDIT  Another example  suggested by Rukmal Dias

User · Answer

Create Parcelable class without plugin in Android Studio  implements Parcelable in your class and then put cursor on  implements  Parcelable  and hit  Alt Enter and select Add Parcelable implementation  see image   that s it

User · Answer

Here is a website to create a Parcelable Class from your created class   http   www parcelabler com

User · Answer

1  Import Android Parcelable code generator    2  Create a class  public class Sample       int id      String name      3  Generate   Parcelable from menu     Done

User · Answer

I have found simplest way to create Parcelable class

User · Answer

IntelliJ IDEA and Android Studio have plugins for this      Android Parcelable code generator  Apache License 2 0  Auto Parcel  The MIT License  SerializableParcelable Generator  The MIT License  Parcelable Code Generator  for Kotlin   Apache License 2 0    These plugins generate Android Parcelable boilerplate code based on fields in the class

User · Answer

To put  bundle putSerializable  key   Serializable  object    To get   List lt Object gt  obj     List lt Object gt    Serializable bundle getSerializable  key

User · Answer

How  With annotations   You simply annotate a POJO with a special annotation and library does the rest       Warning       I m not sure that Hrisey  Lombok  and other code generation libraries are compatible with Android s new build system  They may or may not play nicely with hot swapping code  i e  jRebel  Instant Run     Pros    Code generation libraries save you from the boilerplate source code  Annotations make your class beautiful    Cons    It works well for simple classes  Making a complex class parcelable may be tricky  Lombok and AspectJ don t play well together   details  See my warnings      Hrisey     Warning       Hrisey has a known issue with Java 8 and therefore cannot be used for Android development nowadays    See  1 Cannot find symbol errors  JDK 8     Hrisey is based on Lombok  Parcelable class using Hrisey    hrisey Parcelable public final class POJOClass implements android os Parcelable          Fields  accessors  default constructor        Now you don t need to implement any methods of Parcelable interface  Hrisey will generate all required code during preprocessing phase   Hrisey in Gradle dependencies   provided  pl mg6 hrisey hrisey   hrisey version     See here for supported types  The ArrayList is among them   Install a plugin - Hrisey xor Lombok  - for your IDE and start using its amazing features        Don t enable Hrisey and Lombok plugins together or you ll get an error during IDE launch     Parceler  Parcelable class using Parceler    java org parceler Parcel public class POJOClass          Fields  accessors  default constructor        To use the generated code  you may reference the generated class directly  or via the Parcels utility class using   public static  lt T gt  Parcelable wrap T input     To dereference the  Parcel  just call the following method of Parcels class  public static  lt T gt  T unwrap Parcelable input     Parceler in Gradle dependencies   compile  org parceler parceler-api   parceler version   provided  org parceler parceler   parceler version     Look in README for supported attribute types     AutoParcel  AutoParcel is an AutoValue extension that enables Parcelable values generation   Just add implements Parcelable to your  AutoValue annotated models    AutoValue abstract class POJOClass implements Parcelable          Note that the class is abstract           Abstract fields  abstract accessors         static POJOClass create   abstract fields              return new AutoValue POJOClass   abstract fields               AutoParcel in Gradle build file   apply plugin   com android application  apply plugin   com neenbedankt android-apt   repositories                   maven  url  https   clojars org repo       dependencies       apt  frankiesardo auto-parcel   autoparcel version         PaperParcel  PaperParcel is an annotation processor that automatically generates type-safe Parcelable boilerplate code for Kotlin and Java  PaperParcel supports Kotlin Data Classes  Google s AutoValue via an AutoValue Extension  or just regular Java bean objects   Usage example from docs  Annotate your data class with  PaperParcel  implement PaperParcelable  and add a JVM static instance of PaperParcelable Creator e g     PaperParcel public final class Example extends PaperParcelable       public static final PaperParcelable Creator lt Example gt  CREATOR   new PaperParcelable Creator lt  gt  Example class        private final int test       public Example int test            this test   test             public int getTest             return test            For Kotlin users  see Kotlin Usage  For AutoValue users  see AutoValue Usage     ParcelableGenerator  ParcelableGenerator  README is written in Chinese and I don t understand it  Contributions to this answer from english-chinese speaking developers are welcome   Usage example from README    import com baoyz pg Parcelable    Parcelable public class User        private String name      private int age       public String getName             return name             public void setName String name            this name   name             public int getAge             return age             public void setAge int age            this age   age               The android-apt plugin assists in working with annotation processors in combination with Android Studio

User · Answer

It is very easy  you can use a plugin on android studio to make objects Parcelables   public class Persona implements Parcelable   String nombre  int edad  Date fechaNacimiento   public Persona String nombre  int edad  Date fechaNacimiento        this nombre   nombre      this edad   edad      this fechaNacimiento   fechaNacimiento      Override public int describeContents         return 0      Override public void writeToParcel Parcel dest  int flags        dest writeString this nombre       dest writeInt this edad       dest writeLong fechaNacimiento    null   fechaNacimiento getTime     -1      protected Persona Parcel in        this nombre   in readString        this edad   in readInt        long tmpFechaNacimiento   in readLong        this fechaNacimiento   tmpFechaNacimiento    -1   null   new Date tmpFechaNacimiento      public static final Parcelable Creator lt Persona gt  CREATOR   new Parcelable Creator lt Persona gt          public Persona createFromParcel Parcel source            return new Persona source              public Persona   newArray int size            return new Persona size

[android] How can I make my custom objects Parcelable?

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