Passing a List from One Activity to Another

Passing a List from one Activity to another

You can pass an ArrayList<E> the same way, if the E type is Serializable.

You would call the putExtra (String name, Serializable value) of Intent to store, and getSerializableExtra (String name) for retrieval.

Example:

ArrayList<String> myList = new ArrayList<String>();
intent.putExtra("mylist", myList);

In the other Activity:

ArrayList<String> myList = (ArrayList<String>) getIntent().getSerializableExtra("mylist");

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Please note that serialization can cause performance issues: it takes time, and a lot of objects will be allocated (and thus, have to be garbage collected).

How to send a list of objects from one activity to another in android?

Try this

Code from Calling activity

Intent intent=new Intent(getApplicationContext(),NextActivity.class);
Bundle bundle = new Bundle();
bundle.putParcelableArrayList("VAR1", arraylist);
intent.putExtras(bundle);       
this.startActivity(intent);

Code on called activity

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_second);   

    Bundle bundle = getIntent().getExtras();
    ArrayList<contact> arraylist = bundle.getParcelableArrayList("VAR1");
}

Pass list of objects from one activity to other activity in android

Use parcelable. Here is how you will do it:

public class SharedBooking implements Parcelable{

    public int account_id;
    public Double betrag;
    public Double betrag_effected;
    public int taxType;
    public int tax;
    public String postingText;

    public SharedBooking() {
        account_id = 0;
        betrag = 0.0;
        betrag_effected = 0.0;
        taxType = 0;
        tax = 0;
        postingText = "";
    }

    public SharedBooking(Parcel in) {
        account_id = in.readInt();
        betrag = in.readDouble();
        betrag_effected = in.readDouble();
        taxType = in.readInt();
        tax = in.readInt();
        postingText = in.readString();
    }

    public int getAccount_id() {
        return account_id;
    }
    public void setAccount_id(int account_id) {
        this.account_id = account_id;
    }
    public Double getBetrag() {
        return betrag;
    }
    public void setBetrag(Double betrag) {
        this.betrag = betrag;
    }
    public Double getBetrag_effected() {
        return betrag_effected;
    }
    public void setBetrag_effected(Double betrag_effected) {
        this.betrag_effected = betrag_effected;
    }
    public int getTaxType() {
        return taxType;
    }
    public void setTaxType(int taxType) {
        this.taxType = taxType;
    }
    public int getTax() {
        return tax;
    }
    public void setTax(int tax) {
        this.tax = tax;
    }
    public String getPostingText() {
        return postingText;
    }
    public void setPostingText(String postingText) {
        this.postingText = postingText;
    }
    public int describeContents() {
        // TODO Auto-generated method stub
        return 0;
    }
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(account_id);
        dest.writeDouble(betrag);
        dest.writeDouble(betrag_effected);
        dest.writeInt(taxType);
        dest.writeInt(tax);
        dest.writeString(postingText);

    }

    public static final Parcelable.Creator<SharedBooking> CREATOR = new Parcelable.Creator<SharedBooking>()
    {
        public SharedBooking createFromParcel(Parcel in)
        {
            return new SharedBooking(in);
        }
        public SharedBooking[] newArray(int size)
        {
            return new SharedBooking[size];
        }
    };

}

Passing the data:

Intent intent = new Intent(getApplicationContext(),YourActivity.class);
Bundle bundle = new Bundle();
bundle.putParcelable("data", sharedBookingObject);
intent.putExtras(bundle);
startActivity(intent);

Retrieving the data:

Bundle bundle = getIntent().getExtras();
sharedBookingObject = bundle.getParcelable("data");

How to pass object list from one activity to another in android?

You can send arralist of objects as below

intent.putParcelableArrayListExtra("some_key", (ArrayList<TYPE>) list);
startActivity(intent); 

Retrieve it

ArrayList<TYPE> list = (ArrayList<TYPE>)getIntent().getParcelableArrayListExtra("some_key");

How to pass ArrayListCustomeObject from one activity to another?

You can pass an ArrayList<E> the same way, if the E type is Serializable.

You would call the putExtra (String name, Serializable value) of Intent to store, and getSerializableExtra (String name) for retrieval.

Example:

ArrayList<String> myList = new ArrayList<String>();
intent.putExtra("mylist", myList);

In the other Activity:

ArrayList<String> myList = (ArrayList<String>) getIntent().getSerializableExtra("mylist");

Which way is better for pass a large list of data from one activity to another activity - android?

Best way to pass large data list from one Activity to another in Android is Parcelable . You first create Parcelable pojo class and then create Array-List and pass into bundle like key and value pair and then pass bundle into intent extras.

Below I put one sample User Pojo class that implements Parcelable interface.

import android.os.Parcel;
import android.os.Parcelable;
/**
 * Created by CHETAN JOSHI on 2/1/2017.
 */

public class User implements Parcelable {

    private String city;
    private String name;
    private int age;

    public User(String city, String name, int age) {
        super();
        this.city = city;
        this.name = name;
        this.age = age;
    }

    public User(){
        super();
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    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;
    }

    @SuppressWarnings("unused")
    public User(Parcel in) {
        this();
        readFromParcel(in);
    }

    private void readFromParcel(Parcel in) {
        this.city = in.readString();
        this.name = in.readString();
        this.age = in.readInt();
    }

    public int describeContents() {
        return 0;
    }

    public final Parcelable.Creator<User> CREATOR = new Parcelable.Creator<User>() {
        public User createFromParcel(Parcel in) {
            return new User(in);
        }

        public User[] newArray(int size) {
            return new User[size];
        }
    };

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(city);
        dest.writeString(name);
        dest.writeInt(age);
    }
}
ArrayList<User> info = new ArrayList<User>();
info .add(new User("kolkata","Jhon",25));
info .add(new User("newyork","smith",26));
info .add(new User("london","kavin",25));
info .add(new User("toranto","meriyan",30));

Intent intent = new Intent(MyActivity.this,NextActivity.class);
Bundle bundle = new Bundle();
bundle.putParcelableArrayList("user_list",info );
intent.putExtras(bundle);`
startActivity(intent );

How to Send list of data from one activity to another one activity in android

Finally i completed using the parcelable in my class

public class Channel implements Serializable, Parcelable {

/**  */
private static final long serialVersionUID = 4861597073026532544L;

private String cid;
private String uniqueID;
private String name;
private String logo;
private String thumb;

/**
 * @return the cid
 */
public String getCid() {
    return cid;
}

/**
 * @param cid
 *            the cid to set
 */
public void setCid(String cid) {
    this.cid = cid;
}

/**
 * @return the uniqueID
 */
public String getUniqueID() {
    return uniqueID;
}

/**
 * @param uniqueID
 *            the uniqueID to set
 */
public void setUniqueID(String uniqueID) {
    this.uniqueID = uniqueID;
}

/**
 * @return the name
 */
public String getName() {
    return name;
}

/**
 * @param name
 *            the name to set
 */
public void setName(String name) {
    this.name = name;
}

/**
 * @return the logo
 */
public String getLogo() {
    return logo;
}

/**
 * @param logo
 *            the logo to set
 */
public void setLogo(String logo) {
    this.logo = logo;
}

/**
 * @return the thumb
 */
public String getThumb() {
    return thumb;
}

/**
 * @param thumb
 *            the thumb to set
 */
public void setThumb(String thumb) {
    this.thumb = thumb;
}

public Channel(Parcel in) {
    super();
    readFromParcel(in);
}

public static final Parcelable.Creator<Channel> CREATOR = new Parcelable.Creator<Channel>() {
    public Channel createFromParcel(Parcel in) {
        return new Channel(in);
    }

    public Channel[] newArray(int size) {

        return new Channel[size];
    }

};

public void readFromParcel(Parcel in) {
    String[] result = new String[23];
    in.readStringArray(result);

    this.cid = result[0];
    this.uniqueID = result[1];
    this.name = result[2];
    this.logo = result[3];
    this.thumb = result[4];

}

public int describeContents() {
    return 0;
}

public void writeToParcel(Parcel dest, int flags) {
    dest.writeStringArray(new String[] { this.cid, this.uniqueID,
            this.name, this.logo, this.thumb});

}}

In AcivityA use like this to send data.

Bundle bundle = new Bundle();
bundle.putParcelableArrayList("channel",(ArrayList<Channel>) channels);
Intent intent = new Intent(ActivityA.this,ActivityB.class);
intent.putExtras(bundle);
startActivity(intent);

In ActivityB use like this to get data.

Bundle getBundle = this.getIntent().getExtras();
List<Channel> channelsList = getBundle.getParcelableArrayList("channel");

How to pass a list of objects from one activity to another using parcelable

Check whether you have added RecyclerView in xml i.e, activity_second.xml

If you have added Recyclerview in xml check whether you have referenced it using findViewById in SecondActivity

RecyclerView CartItemsInRecyclerView = findViewById(R.id.recyclerview_id)

You are getting error for Layout Manager i.e referencing it using null object reference , that means CartItemsInRecyclerView is null

Edit :

In First activity:-

 for (int i = 0; i < itemsInCart.size(); i++){

            additems.add(itemsInCart.get(i));

        }

//log statement 

 for (int i = 0; i < additems.size(); i++){

  Log.d("firstActivity",i.getItenname())

 }
        
 

In Second Activity:-

Instead of bundle.getgetParcelableArrayList try getIntent().getgetParcelableArrayList

  ArrayList<Item> selecteditems = 
  getIntent().getParcelableArrayList("Itemselected");

//log statement

 if(selecteditems.size()!=0){

   for (int i = 0; i < selecteditems.size(); i++){

       Log.d("secondActivity",i.getItenname())
  }

 }else{

    Log.d("secondActivity","empty data")
 }

Then check the result in Logcat

How to Pass a List of Objects from activity A to activity B in Kotlin?

In your activity B to get your list try like the following

var arr = this.getIntent().getParcelableArrayListExtra<Parcelable>("Personas")

and make sure your Persona is extend Parcelable like below.

class Persona() : Parcelable {
   // ....
   @Override
   public void writeToParcel(Parcel dest, int flags) {
       //....
   }

   private void readFromParcel(Parcel in) {
      //....
   }
   override fun describeContents(): Int {
      return 0
   }

   companion object CREATOR : Creator<Persona> {
    override fun createFromParcel(parcel: Parcel): Persona{
      return Persona(parcel)
    }

    override fun newArray(size: Int): Array<Persona?> {
      return arrayOfNulls(size)
    }
  }

}

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