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how to pass HashSet object from from one Fragment to another Fragment in android

i want to Pass Hash_set object when click on button,object pass from one fragment to another fragment. in Hash_set object I Put multiple Parse Object in Hash_set object .How to do it ? i tried with Intent and Bundle but not get successful to pass object.
please provide me any best idea. thanks `

You can Also use Application.
step1:Use this class
public class JsonApplication extends Application {
public JSONObject jsonObject;
public JSONObject getJsonObject() {
return jsonObject;
}
public void setJsonObject(JSONObject jsonObject) {
this.jsonObject = jsonObject;
}}
step2: set data and get data as your desire

Simply, create an static object of your hashset in the activity like this,
public static Set<YourObject> mObject = new HashSet<YourObject>();
and from your BaseAdapter-button-onClick call it in this way,
ActivityName.mObject = mYourHashSet;
A public static field/method
An alternate way to make data accessible across Activities/Services is
to use public static fields and/or methods. You can access these
static fields from any other class in your application. To share an
object, the activity which creates your object sets a static field to
point to this object and any other activity that wants to use this
object just accesses this static field.
Other way todo this,
In you baseAdapter-onClick, convert it to JSONObject like that,
JSONObject multiple = new JSONObject();
multiple.put("hash_set_object", mHashSetObject);
Intent ii = new Intent(mActivity, ActivityName.class);
ii.putExtra("hash_set_json", multiple.toString());
startActivity(ii);
In Activity's onCreate call it in this way,
String HashString = getIntent().getExtras().getString("hash_set_json");
JSONArray array = new JSONArray(new JsonObject(HashString).getString("hash_set_object"));
//Now make for-loop to re-populate hashSet from JSONArray

How to use onSaveInstanceState method with Arraylist

I have built an ArrayList with an API results. I don`t want it to disappear when a user rotates his phone.
What should I do with onSaveInstanceState?
JSONObject json = new JSONObject(result);
JSONArray searchArray = json.getJSONArray("Search");
for (int i = 0; i < searchArray.length(); i++) {
JSONObject searchObject = searchArray.getJSONObject(i);
String title = searchObject.getString("Title");
String type = searchObject.getString("Type");
String year = searchObject.getString("Year");
String imdbID = searchObject.getString("imdbID");
movieList.add(new Movie(title, type, year, imdbID));

Assuming the arrayList you want to keep track of is called myArrayList
This code in the activity will serve your purpose :
For String Array :
ArrayList myArrayList;
//put value of myArrayList in some other method
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putStringArrayList("myArrayList", myArrayList);
}
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
myArrayList = savedInstanceState.getStringArrayList("myArrayList");
}
For Custom Object Array :
Make the objects' class implement the interface Parcelable and then add the objects to the ArrayList. In your case, make the Movie class implement Parcelable and add the objects to movieList.
Then use the same methods and instead of putStringArrayList() use :
outState.putParcelableArrayList("movieList", movieList);
Similarly, use :
movieList = (ArrayList<Movie>) savedInstanceState.getParcelableArrayList("movieList");
in the onRestoreInstanceState() method to get the array back.

Sending arraylist of objects using serializable

I am storing my JSON data into a arraylist of objects, my object class is Venue and I am passing that data into another activity using serializable from fragment but I am not receiving any values in the actvity. It is receiving the extra. bundle is not null.
My code is:
Fragment:
Intent intent = new Intent(getActivity(), SearchVenueActivity.class);
//pass values
Bundle bundle = new Bundle();
bundle.putSerializable("arrayListVenue",arrayListVenue);
intent.putExtras(bundle);
startActivity(intent);
Activity:
if (getIntent().hasExtra("arrayListVenue")) {
Bundle bundle = getIntent().getExtras();
if(bundle!=null)
rowItems = (ArrayList<Venue>) bundle.getSerializable("arrayListVenue");
else
Log.e("null","null");
}
Venue Class:
public class Venue implements Serializable{
String venue_id;
String venue_name;
String venue_address;
String venue_city;
public String getVenue_city() {
return venue_city;
}
public void setVenue_city(String venue_city) {
this.venue_city = venue_city;
}
public Venue(String venue_id, String venue_name, String venue_address, String venue_city, String venue_zip, String venue_phone, String venue_mobile) {
this.venue_id = venue_id;
this.venue_name = venue_name;
this.venue_address = venue_address;
this.venue_city = venue_city;
this.venue_zip = venue_zip;
this.venue_phone = venue_phone;
this.venue_mobile = venue_mobile;
}
public String getVenue_id() {
return venue_id;
}
public void setVenue_id(String venue_id) {
this.venue_id = venue_id;
}
public String getVenue_name() {
return venue_name;
}
public void setVenue_name(String venue_name) {
this.venue_name = venue_name;
}
}

try this way may this help you
First you want to make
Class Venue implements Serializable
public class Venue implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
}
In your FirstActivity do this way
ArrayList<Venue> VenueArrayList = new ArrayList<Venue>();
Intent intent = new Intent(this,secondActivity.class);
intent.putExtra("VenueArrayList", VenueArrayList);
In your SecondActivity do this way
ArrayList<Venue> VenueArrayList;
VenueArrayList = (ArrayList<Venue>) getIntent().getSerializableExtra(
"VenueArrayList");

Learn from my mistakes.
I've tried to send Arrays and big objects using Serializablethen my app got really slow. Did some tests and found out that when it took a lot of cpu and time to parse it. Therefore (altough its not what you would call best practice) i've created a CacheManager that store object for short time periods and used it to pass larger object between fragments activities.
If you want to make a more readical change to your design (later on in my project i did exactly that) then seperate the data from your fragment/activity completely and load it by LoaderManagers and pass only specific id's or stuff like that (stored stuff in the db in my case so it was easier).

Use intent.putParcelableArrayListExtra("arrayListVenue",arrayListVenue); for putting arraylist to intent and use intent.getParcelableArrayExtra("arrayListVenue") for get arraylist back from intent in your SearchVenueActivity activity
Edit
Tutorial for using parcelable

Use Array List instead of Bundle Elements.
In your Main Activity, try this:
Intent intent = new Intent(this, newactivity.class);
intent.putParceableListArrayExtra("your_array_list_name", arrayList);
In the next activity where you want to retreive it, just use:
getIntent().getExtra("your_array_list_name", new ArrayList<> arrayList2);

Help with passing ArrayList and parcelable Activity

So I've been googling most of yesterday and last nite and just can't seem to wrap my head around how to pass an arraylist to a subactivity. There are tons of examples and snippets passing primitive data types, but what I have is an arraylist of type address (address.java below).
I've found a lot of stuff on stackoverflow and around the web on this, but nothing that got a lot of attention except for one with a GeoPoint example. Again, it looked to me like they just flattened the GeoPoint object into two integers and passed it in. I can't do that because my address class may expand to include integers, floats, whatever. Right now, the test app below is only two strings for simplicity. I thought if I could get the parcelalbe stuff working with that, the rest could follow.
Can someone post a working example for an ArrayList of a non-primitive object, or perhaps add code below to make this work?
UPDATE: code below is now working after replies/editing. Thanks!
/* helloParcel.java */
public class helloParcel extends Activity
{
// holds objects of type 'address' == name and state
private ArrayList <address> myList;
#Override
public void onCreate (Bundle savedInstanceState)
{
super.onCreate (savedInstanceState);
setContentView (R.layout.main);
Button b1 = (Button) findViewById(R.id.button1);
b1.setOnClickListener(ocl);
myList = new ArrayList();
address frank = new address ("frank", "florida");
address mary = new address ("mary", "maryland");
address monty = new address ("monty", "montana");
myList.add (frank);
myList.add (mary);
myList.add (monty);
// add the myList ArrayList() the the extras for the intent
}
OnClickListener ocl = new OnClickListener()
{
#Override
public void onClick(View v)
{
// fill parceable and launch activity
Intent intent = new Intent().setClass(getBaseContext (), subActivity.class);
// for some reason, I remember a posting saying it's best to create a new
// object to pass. I have no idea why..
ArrayList <address> addyExtras = new ArrayList <address>();
for (int i = 0; i < myList.size(); i++)
addyExtras.add (myList.get(i));
intent.putParcelableArrayListExtra ("mylist", addyExtras);
startActivity(intent);
}
};
}
/* address.java */
public class address implements Parcelable
{
private String name;
private String state;
private static String TAG = "** address **";
public address (String n, String s)
{
name = n;
state = s;
Log.d (TAG, "new address");
}
public address (Parcel in)
{
Log.d (TAG, "parcel in");
name = in.readString ();
state = in.readString ();
}
public String getState ()
{
Log.d (TAG, "getState()");
return (state);
}
public String getName ()
{
Log.d (TAG, "getName()");
return (name);
}
public static final Parcelable.Creator<address> CREATOR
= new Parcelable.Creator<address>()
{
public address createFromParcel(Parcel in)
{
Log.d (TAG, "createFromParcel()");
return new address(in);
}
public address[] newArray (int size)
{
Log.d (TAG, "createFromParcel() newArray ");
return new address[size];
}
};
#Override
public int describeContents ()
{
Log.d (TAG, "describe()");
return 0;
}
#Override
public void writeToParcel (Parcel dest, int flags)
{
Log.d (TAG, "writeToParcel");
dest.writeString (name);
dest.writeString (state);
}
}
/* subActivity.java */
public class subActivity extends Activity
{
private final String TAG = "** subActivity **";
private ArrayList <address> myList;
#Override
protected void onCreate (Bundle savedInstanceState)
{
super.onCreate (savedInstanceState);
Log.d (TAG, "onCreate() in subActivity");
setContentView(R.layout.subactivity);
TextView tv1 = (TextView) findViewById(R.id.tv_sub);
myList = getIntent().getParcelableArrayListExtra ("mylist");
Log.d (TAG, "got myList");
for (int i = 0; i < myList.size (); i++)
{
address a = myList.get (i);
Log.d (TAG, "state:" + a.getState ());
tv1.setText (a.getName () + " is from " + a.getState ());
}
}
}

I can see a number of problems here:
Why use addressParcelable? Why not make address implement Parcelable, and then use:
intent.putParcelableArrayListExtra( "addresses", addyExtras );
Your parcelable object must include a static CREATOR. See the documentation for details.
You are not actually adding any extras to the intent before you call startActivity(). See point 1 for a suggestion here.
I think that you will need to address all of these issues in order to get it working.

It can be done MUCH simpler, without all the pain-in-the-ass of implementing Parcelable...
ArrayList (but NOT any List) is Serializable. So, you can put the entire list using putExtra() and retrieve it using getSerializableExtra(), as Sam said.
BUT, I want to add one more important thing: the object your array list stores has to also implement Serializable... and all other complex objects that the object may contain (in your case none) must also implement that (so it's recursive - in order to serialize an object, you must be able to serialize all of its fields).
Now, you might be asking yourself why implementing Serializable instead of Parcelable when there are already methods for reading and writing array lists of parcelables?
Well... the difference is simplicity - just add implements Serializable and optionally private static final long serialVersionUID = SOME_CONSTANT and you're DONE! That is the reason why I never use Parcelable - you can do all those things using Serializable with literally 2 lines of code - instead of many method inheritances and all that stuff...

You can pass Serializable objects via putExtra. ArrayList implements Serializable.

Mike dg is correct!
putExtra() and getSerializable() will store and retrieve an ArrayList<> of your custom objects, with no interface implementing required. Worked for me!

Passing JSONObject into another activity

I'm hitting an external API that's returning JSON data (new dvd titles). I'm able to parse out the JSON and list each dvd title and other dvd information into a ListView just fine. I was also able to setup an onListItemClick method just fine for primitive data (title string). I ended up writing something like so for the onListItemClick method:
Just to note, the productArray is a class var that's being set by another method that holds an array of JSONObjects.
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
Intent i = new Intent(DvdListingActivity.this, MovieProductActivity.class);
try {
JSONObject jsonObj = productArray.getJSONObject(position);
i.putExtra("mTitle", jsonObj.getJSONObject("Title").opt("val").toString());
i.putExtra("mRelDate", jsonObj.getJSONObject("RelDate").opt("val").toString());
i.putExtra("mDesc", jsonObj.getJSONObject("Desc").opt("val").toString());
i.putExtra("mRating", jsonObj.getJSONObject("MPAA").getJSONObject("Rating").opt("val").toString());
i.putExtra("mActors", jsonObj.getJSONObject("Actors").opt("val").toString());
i.putExtra("mImage", jsonObj.getJSONObject("Image").opt("val").toString());
startActivity(i);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
The above code all works, but I'm thinking there's GOTTA be a better way for me to pass in data to another Activity. I was thinking that I would be able to pass a JSONObject that contains all the data for a dvd movie instead of setting each data point individually.
I tried for a week and a half to figure out how to use Parcelable. I tried instantiating a new JSONObject jsonObj that implements Parcelable with no luck. I kept getting an error in my LogCat that said that the object was un-parcelable.
I've tried reading the Android developer site and other blogs, but I couldn't apply their examples to what I needed to do.
Any help would be much appreciated

You can simply put an entire JSONObject as a string. Something like this:
i.putString("product", jsonObj.toString);
And then in the MovieProductActivity you could
JSONObject jsonObj = new JSONObject(getIntent().getStringExtra("product"));

From Current Activity
Intent mIntent = new Intent(CurrentActivity.this, TargetActivity.class);
mIntent.putExtra("ITEM_EXTRA", json_object.toString());
startActivity(mIntent);
From Target Activity's onCreate
try {
json_object = new JSONObject(getIntent().getStringExtra("ITEM_EXTRA"));
Log.e(TAG, "Example Item: " + json_object.getString("KEY"));
} catch (JSONException e) {
e.printStackTrace();
}

You can just encapsulate all of the information about a movie into a Movie object, which implements Parcelable.
The code will look similar to above, but instead of passing 6 different extras you can just pass one extra that is the movie.
Movie movie = new Movie();
movie.setTitle(jsonObj.getJSONObject("Title").opt("val").toString());
movie.setRelDat(jsonObj.getJSONObject("RelDate").opt("val").toString());
.
.
.
i.putExtra("movie", movie);
For information on implementing a Parcelable object, see Parcelable docs. You basically just write out each string in 'writeToParcel', and read in each string in 'readFromParcel' in the correct order.

The answer posted here by Cheryl Simon is completely correct however this might not explain it too clearly for someone who is new to android or java. Please let me build on her answer.
The best and cleanest way to do this is with the Parcelable interface.
Declare a class as below that implements Parcelable. This one uses an accessor and mutator which isn't actually necessary.
public class JSonArrayParser implements Parcelable {
private JSONArray jsonArray;
public JSonArrayParser() {}
public JSonArrayParser(JSONArray jsonArray) {
this.jsonArray = jsonArray;
}
public void setJsonArray(JSONArray jsonArray) {
this.jsonArray = jsonArray;
}
public JSONArray getJsonArray() {
return jsonArray;
}
#Override
public int describeContents() {
return 0;
}
#Override
public void writeToParcel(Parcel dest, int flags) {
}
}
The next step would be to create an instance of that class (in this case JSonArrayParser) and pass it through the Bundle as in the example below.
//This could be an Activity, Fragment, DialogFragment or any class that uses the Bundle Type such as savedInstanceState.
jobItemsPopUp = new JobItemsPopUp();//This example uses a DialogFragment.
Bundle bundle = new Bundle();
JSonArrayParser jSonArrayParser = new JSonArrayParser(jsonArray);
bundle.putParcelable("jsonArray", jSonArrayParser);
jobItemsPopUp.setArguments(bundle);
jobItemsPopUp.show(getActivity().getSupportFragmentManager(), "JobItemsPopUp");
The the way your would retrieve the value would be as follows (I've used the onCreate but you can retrieve the value anywhere):
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
this.jsonArray = ((JSonArrayParser) getArguments().getParcelable("jsonArray")).getJsonArray();
}
}
Just as an additional note: you can do this with custom constructors, but this method has been deprecated by Google.
The old deprecated method (associated with app compat v4 NOT RECOMMENDED) would be:
private Fragment MyFragment;
MyFragment = new MyFragment(jsonArray)
Hope this help and clears a few things up.
The Parcelable interface can be used with any data class with or without mutators and/or accessors.

Are you storing the information in a DB? If you are, you can simply pass the ID of the desired title (via the intent).

Have a look at gson. It allows you to sereialise and deserialise JSON blobs to entire class instances.

Just create a Parcel like this:
public class Parcel implements Serializable {
private JSONObject obj;
public Parcel(JSONObject obj) {
this.obj = obj;
}
public JSONObject getObj() {
return obj;
}}
And put into the bundle:
Parcel p = new Parcel(data);
Bundle args = new Bundle();
args.putSerializable("events", p);
Finally, you can get the JSONObject back using:
JSONObject obj = ((Parcel) ((Bundle) getArguments()).getSerializable("events")).getObj();