How to pass ArrayList of Objects from one to another activity using Intent in android

Question

I have the following in code in my onClick   method as    List lt Question gt  mQuestionsList   QuestionBank getQuestions      Now I have the intent after this line  as follows      Intent resultIntent   new Intent this  ResultActivity class     resultIntent putParcelableArrayListExtra  QuestionsExtra    ArrayList lt   extends Parcelable gt   mQuestionsList     startActivity resultIntent     I don t know how to pass this question lists in the intent from one activity to another activity My Question class  public class Question       private int   operands      private int   choices      private int userAnswerIndex       public Question int   operands  int   choices            this operands   operands          this choices   choices          this userAnswerIndex   -1             public int   getChoices             return choices             public void setChoices int   choices            this choices   choices             public int   getOperands             return operands             public void setOperands int   operands            this operands   operands             public int getUserAnswerIndex             return userAnswerIndex             public void setUserAnswerIndex int userAnswerIndex            this userAnswerIndex   userAnswerIndex             public int getAnswer             int answer   0          for  int operand   operands                answer    operand                    return answer             public boolean isCorrect             return getAnswer      choices this userAnswerIndex              public boolean hasAnswered             return userAnswerIndex    -1              Override     public String toString             StringBuilder builder   new StringBuilder                Question         builder append  Question              for int operand   operands                builder append String format   d    operand                      builder append System getProperty  line separator                 Choices         int answer   getAnswer            for  int choice   choices                if  choice    answer                    builder append String format   d  A     choice                  else                   builder append String format   d    choice                                    return builder toString

User · Answer

I had the exact same question and while still hassling with the Parcelable, I found out that the static variables are not such a bad idea for the task.

You can simply create a

public static ArrayList<Parliament> myObjects = ..

and use it from elsewhere via MyRefActivity.myObjects

I was not sure about what public static variables imply in the context of an application with activities. If you also have doubts about either this or on performance aspects of this approach, refer to:

Cheers.

User · Answer

You can use parcelable for object passing which is more efficient than Serializable    Kindly refer the link which i am share contains complete parcelable sample  Click download ParcelableSample zip

User · Answer

Between Activity  Worked for me ArrayList lt Object gt  object   new ArrayList lt Object gt     Intent intent   new Intent Current class  Transfer class   Bundle args   new Bundle    args putSerializable  quot ARRAYLIST quot   Serializable object   intent putExtra  quot BUNDLE quot  args   startActivity intent    In the Transfer class Intent intent   getIntent    Bundle args   intent getBundleExtra  quot BUNDLE quot    ArrayList lt Object gt  object    ArrayList lt Object gt   args getSerializable  quot ARRAYLIST quot     Hope this help s someone  Using Parcelable to pass data between Activity This usually works when you have created DataModel e g  Suppose we have a json of type        quot bird quot               quot id quot   1           quot name quot    quot Chicken quot                    quot id quot   2           quot name quot    quot Eagle quot            Here bird is a List and it contains two elements so we will create the models using jsonschema2pojo Now we have the model class Name BirdModel and Bird BirdModel consist of List of Bird and Bird contains name and id Go to the bird class and add interface  quot implements Parcelable quot  add implemets method in android studio by Alt Enter Note  A dialog box will appear saying Add implements method press Enter The add Parcelable implementation by pressing the Alt   Enter Note  A dialog box will appear saying Add Parcelable implementation and Enter again Now to pass it to the intent  List lt Bird gt  birds   birdModel getBird    Intent intent   new Intent Current this  Transfer class   Bundle bundle   new Bundle    bundle putParcelableArrayList  quot Birds quot   birds   intent putExtras bundle   startActivity intent    And on Transfer Activity onCreate List lt Bird gt  challenge   this getIntent   getExtras   getParcelableArrayList  quot Birds quot     Thanks If there is any problem please let me know

User · Answer

I found that most of the answers work but with a warning  So I have a tricky way to achieve this without any warning  ArrayList lt Question gt  questionList   new ArrayList lt  gt         Intent intent   new Intent CurrentActivity this  ToOpenActivity class   for  int i   0  i  lt  questionList size    i          Question question   questionList get i       intent putExtra  quot question quot    i  question     startActivity intent    And now in Second Activity ArrayList lt Question gt  questionList   new ArrayList lt  gt      Intent intent   getIntent    int i   0  while  intent hasExtra  quot question quot    i        Question model    Question  intent getSerializableExtra  quot question quot    i       questionList add model       i       Note  implements Serializable in your Question class

User · Answer

Your arrayList   ArrayList lt String gt  yourArray   new ArrayList lt  gt       Write this code from where you want intent    Intent newIntent   new Intent this  NextActivity class   newIntent putExtra  name  yourArray   startActivity newIntent     In Next Activity   ArrayList lt String gt  myArray   new ArrayList lt  gt       Write this code in onCreate   myArray   ArrayList lt String gt  getIntent   getSerializableExtra  name

User · Answer

Simple as that    worked for me  From activity          Intent intent   new Intent Viewhirings this  Informaall class           intent putStringArrayListExtra  list  nselectedfromadapter            startActivity intent     TO activity  Bundle bundle   getIntent   getExtras        nselectedfromadapter  bundle getStringArrayList  list

User · Answer

You must need to also implement Parcelable interface and must add writeToParcel method to your Questions class with Parcel argument in Constructor in addition to Serializable  otherwise app will crash

User · Answer

Pass your object via Parcelable  And here is a good tutorial to get you started  First Question should implements Parcelable like this and add the those lines   public class Question implements Parcelable      public Question Parcel in               put your data using   in readString      this operands   in readString         this choices   in readString         this userAnswerIndex   in readString                 public Question                 Override     public int describeContents                TODO Auto-generated method stub         return 0              Override     public void writeToParcel Parcel dest  int flags            dest writeString operands           dest writeString choices           dest writeString userAnswerIndex              public static final Parcelable Creator lt Question gt  CREATOR   new Parcelable Creator lt Question gt                Override         public Question   newArray int size                return new Question size                       Override         public Question createFromParcel Parcel source                return new Question source                         Then pass your data like this   Question question   new Question       put your data   Intent resultIntent   new Intent this  ResultActivity class     resultIntent putExtra  QuestionsExtra   question     startActivity resultIntent     And get your data like this   Question question   new Question    Bundle extras   getIntent   getExtras    if extras    null       question   extras getParcelable  QuestionsExtra        This will do

User · Answer

Your bean or pojo class should implements parcelable interface   For example   public class BeanClass implements Parcelable      String name      int age      String sex       public BeanClass String name  int age  String sex            this name   name          this age   age          this sex   sex              public static final Creator lt BeanClass gt  CREATOR   new Creator lt BeanClass gt               Override         public BeanClass createFromParcel Parcel in                return new BeanClass in                       Override         public BeanClass   newArray int size                return new BeanClass size                         Override     public int describeContents             return 0              Override     public void writeToParcel Parcel dest  int flags            dest writeString name           dest writeInt age           dest writeString sex             Consider a scenario that you want to send the arraylist of beanclass type from Activity1 to Activity2  Use the following code  Activity1   ArrayList lt BeanClass gt  list new ArrayList lt BeanClass gt      private ArrayList lt BeanClass gt  getList         for int i 0 i lt 5 i               list add new BeanClass  xyz   25   M               return list    private void gotoNextActivity         Intent intent new Intent this Activity2 class          Bundle args   new Bundle        args putSerializable  ARRAYLIST   Serializable list       intent putExtra  BUNDLE  args          Bundle bundle   new Bundle        bundle putParcelableArrayList  StudentDetails   list       intent putExtras bundle       startActivity intent       Activity2   ArrayList lt BeanClass gt  listFromActivity1 new ArrayList lt  gt      listFromActivity1 this getIntent   getExtras   getParcelableArrayList  StudentDetails     if  listFromActivity1    null         Log d  listis     listFromActivity1 toString         I think this basic to understand the concept

User · Answer

Steps    Implements your object class to serializable  public class Question implements Serializable   Put this in your Source Activity   ArrayList lt Question gt  mQuestionList   new ArrayList lt Question gt   mQuestionsList   QuestionBank getQuestions      mQuestionList add new Question ops1  choices1     Intent intent   new Intent SourceActivity this  TargetActivity class   intent putExtra  QuestionListExtra   mQuestionList    Put this in your Target Activity   ArrayList lt Question gt  questions   new ArrayList lt Question gt      questions    ArrayList lt Questions gt   getIntent   getSerializableExtra  QuestionListExtra

User · Answer

You can Pass Arraylist Pojo using bundle  like this    Intent intent   new Intent MainActivity this  SecondActivity class   Bundle args   new Bundle                            args putSerializable  imageSliders   Serializable allStoriesPojo getImageSliderPojos                             intent putExtra  BUNDLE  args    startActivity intent      Get those values in SecondActivity like this    Intent intent   getIntent            Bundle args   intent getBundleExtra  BUNDLE      String filter   bundle getString  imageSliders

User · Answer

To set the data in kotlin  val offerIds   ArrayList lt Offer gt    offerIds add Offer 1   retrunIntent putExtra C OFFER IDS  offerIds    To get the data   val offerIds   data getSerializableExtra C OFFER IDS  as ArrayList lt Offer gt     Now access the arraylist

User · Answer

Implements Parcelable and send arraylist as putParcelableArrayListExtra and get it from next activity getParcelableArrayListExtra   example   Implement parcelable on your custom class - Alt  enter  Implement its methods  public class Model implements Parcelable    private String Id   public Model         protected Model Parcel in        Id  in readString              public static final Creator lt Model gt  CREATOR   new Creator lt Model gt           Override     public ModelcreateFromParcel Parcel in            return new Model in               Override     public Model   newArray int size            return new Model size             public String getId         return Id     public void setId String Id        this Id   Id       Override public int describeContents         return 0      Override public void writeToParcel Parcel dest  int flags        dest writeString Id         Pass class object from activity 1    Intent intent   new Intent Activity1 this  Activity2 class               intent putParcelableArrayListExtra  model   modelArrayList               startActivity intent     Get extra from Activity2  if  getIntent   hasExtra  model              Intent intent   getIntent            cartArrayList   intent getParcelableArrayListExtra  model

User · Answer

The easiest way to pass ArrayList using intent  Add this line in dependencies block build gradle  implementation  com google code gson gson 2 2 4    pass arraylist ArrayList lt String gt  listPrivate   new ArrayList lt  gt       Intent intent   new Intent MainActivity this  ListActivity class   intent putExtra  quot private list quot   new Gson   toJson listPrivate    startActivity intent     retrieve list in another activity ArrayList lt String gt  listPrivate   new ArrayList lt  gt      Type type   new TypeToken lt List lt String gt  gt        getType    listPrivate   new Gson   fromJson getIntent   getStringExtra  quot private list quot    type      You can use object also instead of String in type Works for me

User · Answer

It works well   public class Question implements Serializable       private int   operands      private int   choices      private int userAnswerIndex      public Question int   operands  int   choices           this operands   operands         this choices   choices         this userAnswerIndex   -1           public int   getChoices            return choices           public void setChoices int   choices           this choices   choices           public int   getOperands            return operands           public void setOperands int   operands           this operands   operands           public int getUserAnswerIndex            return userAnswerIndex           public void setUserAnswerIndex int userAnswerIndex           this userAnswerIndex   userAnswerIndex           public int getAnswer            int answer   0         for  int operand   operands               answer    operand                  return answer           public boolean isCorrect            return getAnswer      choices this userAnswerIndex            public boolean hasAnswered            return userAnswerIndex    -1            Override    public String toString            StringBuilder builder   new StringBuilder               Question        builder append  Question             for int operand   operands               builder append String format   d    operand                    builder append System getProperty  line separator                Choices        int answer   getAnswer           for  int choice   choices               if  choice    answer                   builder append String format   d  A     choice                 else                  builder append String format   d    choice                                 return builder toString                 In your Source Activity  use this      List lt Question gt  mQuestionList   new ArrayList lt Question gt     mQuestionsList   QuestionBank getQuestions      mQuestionList add new Question ops1  choices1       Intent intent   new Intent SourceActivity this  TargetActivity class     intent putExtra  QuestionListExtra   ArrayList lt Question gt mQuestionList     In your Target Activity  use this      List lt Question gt  questions   new ArrayList lt Question gt       questions    ArrayList lt Question gt  getIntent   getSerializableExtra  QuestionListExtra

User · Answer

Your intent creation seems correct if your Question implements Parcelable   In the next activity you can retrieve your list of questions like this    Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState        if getIntent      null  amp  amp  getIntent   hasExtra  QuestionsExtra              List lt Question gt  mQuestionsList   getIntent   getParcelableArrayListExtra  QuestionsExtra

User · Answer

You can pass the arraylist from one activity to another by using bundle with intent  Use the code below This is the shortest and most suitable way to pass arraylist  bundle putStringArrayList  keyword  arraylist

User · Answer

If your class Question contains only primitives  Serializeble or String fields you can implement him Serializable  ArrayList is implement Serializable  that s why you can put it like Bundle putSerializable key  value  and send it to another Activity  IMHO  Parcelable - it s very long way

User · Answer

I do one of two things in this scenario   Implement a serialize deserialize system for my objects and pass them as Strings  in JSON format usually  but you can serialize them any way you d like  Implement a container that lives outside of the activities so that all my activities can read and write to this container   You can make this container static or use some kind of dependency injection to retrieve the same instance in each activity    Parcelable works just fine  but I always found it to be an ugly looking pattern and doesn t really add any value that isn t there if you write your own serialization code outside of the model

[android] How to pass ArrayList of Objects from one to another activity using Intent in android?

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