Passing ArrayList through Intent

Question

I am trying to pass an arrayList to another activity using intents  Here is the code in the first activity   case R id editButton          Toast makeText this   edit was clicked   Toast LENGTH LONG  show            Intent intent   new Intent this  editList class           intent putStringArrayListExtra  stock list   stock list           startActivity intent           break    This is where I try to retrieve the list in the second activity  Is something wrong here   Intent i   new Intent      This should be getIntent        stock list   new ArrayList lt String gt          stock list   i getStringArrayListExtra  stock list

User · Answer

Suppose you need to pass an arraylist of following class from current activity to next activity // class of the objects those in the arraylist // remember to implement the class from Serializable interface // Serializable means it converts the object into stream of bytes and helps to transfer that object

public class Question implements Serializable {
... 
... 
...
}

in your current activity you probably have an ArrayList as follows

ArrayList<Question> qsList = new ArrayList<>();
qsList.add(new Question(1));
qsList.add(new Question(2));
qsList.add(new Question(3));

// intialize Bundle instance
Bundle b = new Bundle();
// putting questions list into the bundle .. as key value pair.
// so you can retrieve the arrayList with this key
b.putSerializable("questions", (Serializable) qsList);
Intent i = new Intent(CurrentActivity.this, NextActivity.class);
i.putExtras(b);
startActivity(i);

in order to get the arraylist within the next activity

//get the bundle
Bundle b = getIntent().getExtras();
//getting the arraylist from the key
ArrayList<Question> q = (ArrayList<Question>) b.getSerializable("questions");

User · Answer

In your receiving intent you need to do   Intent i   getIntent      stock list   i getStringArrayListExtra  stock list      The way you have it you ve just created a new empty intent without any extras   If you only have a single extra you can condense this down to   stock list   getIntent   getStringArrayListExtra  stock list

User · Answer

if you using Generic Array List with Class instead of specific type like     EX   private ArrayList lt Model gt  aListModel   new ArrayList lt Model gt       Here  Model   Class  Receiving Intent Like    aListModel    ArrayList lt Model gt   getIntent   getSerializableExtra KEY     MUST REMEMBER   Here Model-class must be implemented like   ModelClass implements Serializable

User · Answer

I have done this one by  Passing ArrayList in form of String    Add compile  com google code gson gson 2 2 4  in dependencies block build gradle   Click on Sync Project with Gradle Files   Cars java   public class Cars       public String id  name      FirstActivity java  When you want to pass ArrayList   List lt Cars gt  cars  new ArrayList lt Cars gt     cars add getCarModel  1    A     cars add getCarModel  2    B     cars add getCarModel  3    C     cars add getCarModel  4    D      Gson gson   new Gson     String jsonCars   gson toJson cars    Intent intent   new Intent FirstActivity this  SecondActivity class   intent putExtra  list as string   jsonCars   startActivity intent     Get CarsModel by Function   private Cars getCarModel String id  String name          Cars cars   new Cars           cars id   id         cars name   name      return cars       SecondActivity java  You have to import java lang reflect Type    on onCreate   to retrieve ArrayList   String carListAsString   getIntent   getStringExtra  list as string     Gson gson   new Gson    Type type   new TypeToken lt List lt Cars gt  gt      getType    List lt Cars gt  carsList   gson fromJson carListAsString  type   for  Cars cars   carsList      Log i  Car Data   cars id  -  cars name       Hope this will save time  I saved it   Done

User · Answer

public class StructMain implements Serializable       public  int id      public String name      public String lastName      this my item   implement Serializable and create ArrayList   ArrayList lt StructMain gt  items  new ArrayList lt  gt       and put in Bundle  Bundle bundle new Bundle    bundle putSerializable  test  items     and create a new Intent that put Bundle to Intent  Intent intent new Intent ActivityOne this ActivityTwo class   intent putExtras bundle   startActivity intent     for receive bundle insert this code  Bundle bundle   getIntent   getExtras    ArrayList lt StructMain gt  item    ArrayList lt StructMain gt   bundle getSerializable  test

User · Answer

arraylist Pojo you can Pass 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 SecondActivity like this   Intent intent   getIntent            Bundle args   intent getBundleExtra  BUNDLE    String filter   bundle getString  imageSliders       Happy coding

[android] Passing ArrayList through Intent

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