Passing data through intent using Serializable

Question

I ve implemented my class with serializable  but it still didn t work   This is my class   package com ursabyte thumbnail   import java io Serializable   import android graphics Bitmap   public class Thumbnail implements Serializable        private static final long serialVersionUID   1L      private String label           private Bitmap bitmap       public Thumbnail String label  Bitmap bitmap            this label   label          this bitmap   bitmap             public void set label String label            this label   label             public String get label             return this label             public void set bitmap Bitmap bitmap            this bitmap   bitmap             public Bitmap get bitmap            return this bitmap                  Override         public int compareTo Thumbnail other                if this label    null                  return this label compareTo other get label                 else                 throw new IllegalArgumentException                   This is what I want to be passing   List lt Thumbnail gt  all thumbs   new ArrayList lt Thumbnail gt     all thumbs add new Thumbnail string  bitmap    Intent intent   new Intent getApplicationContext    SomeClass class   intent putExtra  value   all thumbs     But still it didn t work  I don t know how to use Parcelable  so I use this instead

User · Answer

Intent intent   new Intent getApplicationContext   SomeClass class   intent putExtra  value  all thumbs   startActivity intent     In SomeClass java  Bundle b   getIntent   getExtras    if b    null  thumbs    List lt Thumbnail gt   b getSerializable  value

User · Answer

Don t forget to implement Serializable in every class your object will use like a list of objects  Else your app will crash   Example    public class City implements Serializable    private List lt House gt  house   public List lt House gt  getHouse         return house     public void setHouse List lt House gt  house        this house   house       Then House needs to implements Serializable as so    public class House implements Serializable    private String name   public String getName         return name     public void setName String name        this name   name       Then you can use   Bundle bundle   new Bundle    bundle putSerializable  city   city   intent putExtras bundle     And retreive it with   Intent intent   this getIntent    Bundle bundle   intent getExtras    City city     City bundle getSerializable  city

User · Answer

Sending Data   First make your serializable data by implement Serializable to your data class  public class YourDataClass implements Serializable   String someText  Some text       Then put it into intent  YourDataClass yourDataClass new YourDataClass    Intent intent   new Intent getApplicationContext   ReceivingActivity class   intent putExtra  value  yourDataClass   startActivity intent     Receiving Data   YourDataClass yourDataClass  YourDataClass getIntent   getSerializableExtra  value

User · Answer

You need to create a Bundle and then use putSerializable   List lt Thumbnail gt  all thumbs   new ArrayList lt Thumbnail gt     all thumbs add new Thumbnail string bitmap    Intent intent   new Intent getApplicationContext   SomeClass class    Bundle extras   new Bundle     extras putSerializable  value  all thumbs   intent putExtras extras

User · Answer

This code may help you   public class EN implements Serializable         you don t need implement any methods when you implements Serializable     Putting data  Create new Activity with extra   EN enumb   new EN    Intent intent   new Intent getActivity    NewActivity class   intent putExtra  en   enumb     second param is Serializable startActivity intent     Obtaining data from new activity   public class NewActivity extends Activity        private EN en       Override     public void onCreate Bundle savedInstanceState            try               super onCreate savedInstanceState                Bundle extras   getIntent   getExtras                if  extras    null                    en    EN getIntent   getSerializableExtra  en      Obtaining data

User · Answer

Try to pass the serializable list using Bundle Serializable   Bundle bundle   new Bundle    bundle putSerializable  value   all thumbs   intent putExtras bundle     And in SomeClass Activity get it as   Intent intent   this getIntent    Bundle bundle   intent getExtras     List lt Thumbnail gt  thumbs                  List lt Thumbnail gt  bundle getSerializable  value

User · Answer

1- You are using android graphics Bitmap which doesn t implements Serializable class so you have to remove that class then it will work   2- for brief you can visit how to pass data between intents

User · Answer

Create your custom object and implement Serializable  Next  you can use intent putExtra  package name example    lt your-serializable-object gt     In the second activity  you read it using getIntent   getSerializableExtra  package name example    Otherwise  follow this and this page

User · Answer

I use the following method when sending a List lt MySerializableObject gt  via intent   List lt Thumbnail gt  thumbList   new ArrayList lt  gt       Populate      Intent intent   new Intent context  OtherClass class   intent putExtra  ThumbArray   thumbList toArray new Thumbnail 0       Send intent      And retrieving it like so   Thumbnail   thumbArr    Thumbnail    getIntent   getSerializableExtra  ThumbArray    if  thumbArr    null        List lt Thumbnail gt  thumbList   Arrays asList thumbArr

User · Answer

In kotlin  Object class implements Serializable   class MyClass  Serializable     members     At the point where the object sending   val fragment   UserDetailFragment   val bundle   Bundle   bundle putSerializable  key   myObject  fragment arguments   bundle   At the fragment  where we want to get our object   val bundle  Bundle    arguments     bundle  let           val myObject   it getSerializable  key   as MyClass         myObject memberName  let   it1 - gt  showShortToast it1

User · Answer

I extended   s     K s answer to make the code full and workable  So  when you finish filling your  all thumbs  list  you should put its content one by one into the bundle and then into the intent   Bundle bundle   new Bundle     for  int i   0  i lt all thumbs size    i    bundle putSerializable  extras  i  all thumbs get i     intent putExtras bundle     In order to get the extras from the intent  you need   Bundle bundle   new Bundle    List lt Thumbnail gt  thumbnailObjects   new ArrayList lt Thumbnail gt         collect your Thumbnail objects for  String key   bundle keySet      thumbnailObjects add  Thumbnail  bundle getSerializable key          for example  in order to get a value of the 3-rd object you need to  String label   thumbnailObjects get 2  get label      Advantage of Serializable is its simplicity  However  I would recommend you to consider using Parcelable method when you need transfer many data  because Parcelable is specifically designed for Android and it is more efficient than Serializable  You can create Parcelable class using    an online tool - parcelabler a plugin for Android Studion - Android Parcelable code generator

[java] Passing data through intent using Serializable

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